Abdelkrim Azzouz

Abdelkrim Azzouz
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Abdelkrim verified their affiliation via an institutional email.
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Abdelkrim verified their affiliation via an institutional email.
  • Professor
  • Professor at University of Quebec in Montreal

Research on microporous materials for surface processes. Environmental, biomedical and energy storage purposes

About

303
Publications
50,746
Reads
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3,942
Citations
Introduction
Microporous materials (Clays mineral, zeolites, organically modified and nanoparticle-loaded derivatives) for catalysis and surface phenomena. Advanced inorganic-organic porous matrices for environmental applications, greenhouse gas capture, organic pollutant oxidation and ecotoxicity, food technology, hydrogen production and storage, electronics and medical purposes
Current institution
University of Quebec in Montreal
Current position
  • Professor
Additional affiliations
September 1996 - September 2004
University of Bacău
Position
  • Professor (Full)
Description
  • Teaching and Research activities Supervising students in areas including microporous materials, organoclays, organozeolites, catalysis, adsorption with applications in environmental and food sciences
September 2003 - present
University of Quebec in Montreal
Position
  • Professor (Associate)
Description
  • Teaching and Research activities Supervising students and Post-doctoral traines in areas including microporous materials, organoclays, organozeolites, catalysis, adsorption, environmental chemistry, total mineralization of organic pollutants, greenhouse gasses, hydrogen storage
September 1996 - September 2005
University of Bacău
Position
  • Professor (Full)
Description
  • Teaching cours in Chemical Engineering and Chemistry Research on microporous materials (Clays and zeolites) for catalysis, food technology and environmental purposes
Education
November 1983
Polytechnic Institute of Jassy, Romania
Field of study
  • Heterogenous catalysis on zeolites

Publications

Publications (303)
Article
Full-text available
The ozonation of norfloxacin (NOF), a widely used fluoroquinolone antibiotic, in the presence of Na⁺, Fe²⁺, Cu²⁺, Ni²⁺, and Co²⁺ cations and their montmorillonite-supported counterparts was investigated. The NOF degradation and the toxicity of the ozonized mixtures towards an aquatic organism (Lemna minor) were evaluated in terms of changes in its...
Article
This paper can be accessed during 50 days through the following link before March 08, 2025: https://authors.elsevier.com/a/1kSMWAOMA8-1P Norfloxacin was ozonized in aqueous montmorillonite suspensions and the resulting toxicity on Lemna minor was investigated for understanding the impact of natural partial oxidation of antibiotics on clay-containi...
Article
Full-text available
The chemical synthesis of modified neoglycolipids is reported in an effort to further improve the drug delivery properties of previously described mannosylated liposomes possessing alkyl linkers in the aglyconic moiety. A self-contingent strategy that overcomes previous synthetic limitations was used to produce neoglycolipids that have a single exp...
Article
Full-text available
Pollution from organic molecules is a major environmental issue that needs to be addressed because of the negative impacts of both the harmfulness of the molecule structures and the toxicity that can spread through natural media. This is mainly due to their unavoidable partial oxidation under exposure to air and solar radiation into diverse derivat...
Article
Full-text available
Zero-valent copper and silver metals (Ms) nanoparticles (NPs) supported on carboxymethylcellulose (CMC) were synthesized for treating Enterotoxigenic Escherichia coli fimbriae 4 (ETEC:F4), a major cause of diarrhea in post-weaned pigs. The antibacterial properties of Cu⁰/CMC and Ag⁰/CMC were assessed on infected porcine intestinal enterocyte IPEC-J...
Article
Full-text available
Zeolite NaP1 was found to display the highest affinity for CO2 in preliminary modifications of coal fly ash-derived zeolites (4A, Y, NaP1 and X) by four amines (1,3-diaminopropane, N,N,N′,N′-tetramethylethylenediamine, Tris(2-aminoethyl)amine and ethylenediamine). In the second step, different fatty acid loaded NaP1 samples were prepared using palm...
Article
Full-text available
The use of clay materials in dairy technology requires a multidisciplinary approach that allows correlating clay efficiency in the targeted application to its interactions with milk components. For profitability reasons, natural clays and clay minerals can be used as low-cost and harmless food-compatible materials for improving key processes such a...
Article
Full-text available
Nitrate removal through electroreduction using stainless steel electrodes in recycle mode was found to be enhanced by addition of salts, acids or aluminosilicate-based catalysts such as bentonite, kaolin, illite-montmorillonite mixture and clinoptilolite. High nitrate removal yields were obtained in the presence of salts under optimum flowrate. The...
Article
Full-text available
This paper consists of a deep analysis and data comparison of the main strategies undertaken for achieving truly reversible capture of carbon dioxide involving optimized gas uptakes while affording weakest retention strength. So far, most strategies failed because the estimated amount of CO2 produced by equivalent energy was higher than that captur...
Article
Full-text available
The toxicity of two pesticides, diazinon (DAZ) and atrazine (ATR), before and after montmorillonite-catalyzed ozonation was comparatively investigated on the duckweed Lemna minor. The results allowed demonstrating the role of clay-containing media in the evolution in time of pesticide negative impact on L. minor plants. Pesticides conversion exceed...
Article
An unprecedented approach allowed correlating the pesticide fate in clay-containing media under air exposure with their ecotoxicity through the study of the toxicity of ozonized diazinon and atrazine in Lemna minor growth media. The exchangeable cation and pesticide interactions were found to influence the catalytic surface through a compromise bet...
Article
Full-text available
Catalytic ozonation for the total mineralization of bisphenol-A (BPA) from aqueous solution was investigated in the presence of various silica-based catalysts such as mesoporous silica, acid-activated bentonite (HMt) and montmorillonite-rich materials (Mt) ion-exchanged with Na⁺ and Fe²⁺ cations (NaMt and Fe(II)Mt). The effects of the catalyst surf...
Article
Full-text available
The use of clays as adsorbents and catalysts in the ozonation of organic pollutants (Atrazine, bis-Phenol A, Diazinon, and Diclofenac sodium) allowed simulating their natural oxidative degradation in clay soils and to evaluate the ecotoxicity of mixtures partially oxidized on the species Lemna minor, a biodiversity representative of plants in the a...
Article
Full-text available
An unprecedented route for mitigating the inhibitory effect of lactic acid (LA) on milk fermentation was achieved through lactate adsorption on hydrotalcite (Ht) from simulated lactate extracts. During its regeneration by ozonation, Ht displayed catalytic activity that appeared to increase by addition of montmorillonite (Mt). Changes in the pH, Zet...
Article
Carbon dioxide (CO$_{2}$) was reversibly captured at room temperature and normal pressure by a low cost hybrid absorbent (NaMt-H30) obtained through Na-montmorillonite intercalation with Boltorn dendrimer H30 (1 wt%). Measurements through thermal programmed desorption between 20 °C and 200 °C showed variations of the retention capacities of CO$_{2}...
Article
This personalized URL provides 50 days' free access to this article. Anyone clicking on this link before May 14, 2022 https://authors.elsevier.com/a/1eoTwAOM9zaVo Abstract A promising route for thorough removal of 17α-ethinyl estradiol (EE2) from aqueous media was achieved through ozonation using mesoporous silicas such SBA-15, SBA-16, MCM-41 and...
Article
Full-text available
Carboxymethyl starch (CMS) and carboxymethyl cellulose (CMC) loaded by highly dispersed metal subnanoparticles (MSNPs) showed antibacterial activity against E. coli and B. subtilis strains. Copper and silver were found to act in both cationic and zero-valence forms. The antibacterial activity depends on the metal species content but only up to a ce...
Article
Grafting of a bio-sourced exopolysaccharide (EPS) using a disulfide ethyl moiety with two ammonium ends as interface on Na$^{+}$-exchanged montmorillonite (NaMt) turned out to be a “green” route to produce an OH-enriched organoclay with improved affinity towards CO$_{2}$ and moisture. Characterization through X-ray diffraction, infrared spectroscop...
Article
Full-text available
The oxidative degradation of diazinon (DAZ) and diclofenac sodium (DCF) in aqueous media was comparatively investigated and correlated with the mortality of Artemia salina in the presence of clay catalysts. For this purpose, montmorillonites (Mt) exchanged with Na+ and Fe2+ cations (NaMt and Fe(II)Mt), acid activated bentonites and hydrotalcite wer...
Chapter
Layered double hydroxides (LDH) possess anionic lamellar structures whose surface properties are strongly depending on the types and contents of their trivalent (M3+) bivalent metal (M2+). They can be synthesized by almost similar procedures, but specific operating conditions and chemical composition of the starting gels are determined by the targe...
Poster
Full-text available
Silver nanoparticles incorporated in phyllosilicates
Article
Full-text available
A new approach for the synthesis of zero-valent copper nanoparticles (CuNPs) supported on ordered mesoporous silica SBA-15 and SBA-16 by using vegetal antioxidants, coffee Robusta, and green tea was developed in the present work. Diverse characterization techniques such as X-ray diffraction, nitrogen adsorption–desorption, transmission electron mic...
Article
Full-text available
The role of the retention strength of Cu0 and Ag0 nanoparticles on the induced antibacterial properties of montmorillonite and cellulose-supported polyol dendrimer was comparatively investigated. An unprecedented approach involving X-ray photoelectron spectroscopy, thermal analyses, and surface charge measurements allowed correlating the host–matri...
Presentation
Excessive uses of antimicrobials and their continuous release in wastewater represent an environmental issue, given the negative impact of bacteria resistance enhancement on animal nutrition, and animal & human health. This issue can be addressed through a new strategy using highly dispersed metals in matrices that act as hosts and carriers for fur...
Chapter
Pesticides are organic molecules used in agriculture, the most known being atrazine, lindane, diazinon, dichlorodiphenyltrichloroethane, and N-(phosphonomethyl) glycine (glyphosate). Farmers are the most exposed to direct harmful effects. Foods, water, and the atmosphere are regarded as indirect contact sources. Pesticides comprise three major fami...
Article
Sulfasalazine (SLZ) is an azo drug used for the treatment of rheumatoid arthritis and ulcerative colitis. Its limited water solubility results into low permeability and bioavailability leading to higher daily recommended doses and greater side effects. Host-guest complexation of drugs with β-cyclodextrin (β-CD) is a common strategy to improve oral...
Article
Full-text available
The effects of copper nanoparticles (CuNP) dispersion on the optical and electrical properties of mesoporous SBA-15 like silica were investigated. Full characterization of the resulting SBA-15-Cu through X-ray diffraction (XRD), thermogravimetry analysis (TGA), scanning electron microscopy (SEM), energy dispersion X-ray fluorescence (ED-XRF), diffu...
Article
The surface basicity and hydrophilic character of Mg and Al or Fe-based layered double hydroxides were assessed through thermal programmed desorption (TPD) of CO2 and H2O in terms of CO2 and water retention capacity (CRC and WRC), respectively. LDH calcination up to 450 °C produced slightly irreversible and detrimental effects on both properties, m...
Article
An original approach never tackled so far allowed correlating the basicity and hydrophilic character of clay catalysts with surface interaction with 17α-Ethinylestradiol (EE2) during ozonation in water. The clay catalysts were found to behave specifically according to their silica/alumina ratio like soils in natural oxidative processes. Acid-activa...
Article
This paper can be accessed on-line through the link: https://authors.elsevier.com/a/1bk%7E%7E_3s7dd6Ew for 50 days starting from Sept 15-2020. The surface basicity and hydrophilic character of Mg and Al or Fe-based layered double hydroxides were assessed through thermal programmed desorption (TPD) of CO2 and H2O in terms of CO2 and water retention...
Preprint
Full-text available
This preliminary work provide raw data from attempts to synthesize metal nanoparticles on solid supports devoid of any biocidal property, and to test the induced antibaterial activity on some non-pathogenic bacteria strains.
Article
Aluminosilicate-catalyzed electrochemical decomposition of ammonium cation (NH4+NH4+) in water was investigated using NH4+-saturated clinoptilolite and copper-nickel electrodes in the presence of different salts and acidic species. The results showed beneficial roles of chloride anion and moderately acidic media. NH4+ adsorbed by the zeolites was c...
Article
The presence of metals in industrial wastewater is a major health risk in many places in the world. On pilot, the suitability of a thin film polyamide nanofiltration composite membrane (SNTE NF270-2540) to extract heavy metal ions (Zn, Cr, Cu, Fe, Cd, Pb, Co & Ni) from industrial wastewater was examined. The operating conditions including feed pH v...
Article
Catalytic ozonation of organic dyestuffs such as Methylene-Blue (MB) and Malachite Green (MG) was investigated in the presence of montmorillonite K10 and its Al-Fe modified counterpart (AF-K10). Adsorption was found to play akey-role involving specific acid-base, electrostatic, and/or hydrophilic/organophilic interactions according to the dye molec...
Article
Catalytic ozonation of organic dyestuffs such as Methylene-Blue (MB) and Malachite Green (MG) was investigated in the presence of montmorillonite K10 and its Al-Fe modified counterpart (AF-K10). Adsorption was found to play a key-role involving specific acid-base, electrostatic and/or hydrophilic/organophilic interactions according to the dye molec...
Article
Polyester (PET) was pre-activated by atmospheric air plasma and coated by various inorganic oxide nanoparticles (MOx) such as titanium dioxide (TiO2), zinc oxide (ZnO), and silicon oxide (SiO2), using poly(vinylidene fluoride) (PVDF) and chitosan (CT) as binders. The resulting PET-PVDF-MOx-CT composites were thermally compressed and then characteri...
Article
The syntheses of five propargylated dendrimer scaffolds ranging from 2, 3, 4, 6, and 12 surface groups are described together with a 2-azidoethyl α-D-mannopyranoside. The former is appended to the core structure using highly efficient copper-catalysed azide-alkyne cycloaddition (CuAAC) (“click reaction”) to provide glycodendrimers in an accelerated...
Article
Polyester (PET) was pre-activated by atmospheric air plasma and coated by various material oxide (MOx) such as titanium dioxide (TiO2), zinc oxide (ZnO) and silicon oxide (SiO2), using polyvinylidene fluoride (PVDF) and chitosan (CT) as binders. The resulting PET-PVDF-MOx-CT composites were thermally compressed and then characterized through scanni...
Article
Effective adsorbents for the reversible capture of CO2 at ambient temperature were prepared by acid activation of bentonite (AAB) and chemical grafting of 3-amino-propyltriethoxysilane (γ-APTES) or 3-diethanolamino-propyltriethoxysilane (3-diEtOH-APTES). Full characterization of the resulting organo-AAB materials through X-ray diffraction, nitrogen...
Article
The aim of the present study is to develop an eco-friendly and cost effective method for the synthesis and functionalization of copper oxide (CuO) nanosheets by chemical grafting of 3-(chloropropyl)triethoxysilane (ClPTES), p-aminothiophenol (ATP) and diethanolamine (DEA). Full characterization of the resulting materials through FTIR, X-ray diffrac...
Article
Full-text available
Intercalation of Na⁺-montmorillonite (NaMt) by dendrimer H20 and incorporation of palladium (Pd) and copper (Cu) nanoparticles (PdNP and CuNP) resulted in NaMt-H20-Cu and NaMt-H20-Pd materials with affinity towards carbon dioxide (CO2) and hydrogen (H2). Metal incorporation produced a slight structure compaction due to PdNP and CuNP interactions wi...
Article
In this work, polyester fiber (PET) were functionalized by oxides (Ox) like titanium dioxide (TiO2), zinc oxide (ZnO) and silicon dioxide (SiO2), using polyvinylidene fluoride (PVDF) as binder to obtain a PET-PVDF-Ox material. Chitosan polymer (CT) was further grafted as coating layer to improve the surface compatibility, resulting in the PET-PVDF-...
Article
Dispersion of iron nanoparticles (Fe-NPs) was achieved on polyester fabrics (PET) before and after incorporation of dendrimers (PAMAN), 3-(aminopropyl) triethoxysilane (APTES) or thioglycerol (SH). The catalytic activity of the resulting materials (PET-Fe, PET-PAMAM-Fe, PET-APTES-Fe and PET-SH-FE) was comparatively investigated in the degradation o...
Article
The mesoporous silica SBA-15 functionalized with various amines was prepared and then doped with copper (Cu++). The modified materials were tested for the retention of CO2 at room temperature using temperature-programmed desorption (CO2-TPD). Several parameters affecting the CO2 retention capacity (CRC) were investigated such as effect of the natur...
Article
NiTi-based layered double hydroxides modified by Fe or Zn isomorphic substitution of nickel by iron or zinc showed appreciable affinity towards hydrogen under ambient conditions. This affinity was correlated to their surface basicity. The latter, expressed in terms of CO2 retention capacity (CRC), was assessed through thermal programmed desorption...
Chapter
Water pollution by organic dyestuffs is a major environmental issue to be addressed, given the strong negative impact of such molecules due to both their direct toxicity and that of their derivatives. The presence of such compounds in waters arises mainly from their uses and production in many industrial activities ranging from textile to food tech...
Presentation
Full-text available
Advanced oxidation processes are a set of chemical treatment methods and procedures used to remove pollutants present in wastewater by oxidation through the reaction who involve hydroxyl radical formation. The advantages and drawbacks of these processes are highlighted, while some of challenges (decrease of operational cost, adoption of strategies...
Poster
Full-text available
This work was presented as a poster in a conference with additional data to those already published elsewhere in the attached file. Here below is provided the abstract of this paper before the incoporation of additional data. In this work, we studied the total mineralization of Malachite Green dye by catalytic ozonation. This process is sensitive t...
Article
The affinity towards carbon dioxide (CO2) of coal fly ash-derived zeolites such as 4A, NaP1, zeolite X nanosized and their commercial counterparts was investigated. For this purpose, their surface basicity and hydrophilic character were assessed through thermal programmed desorption measurements (TPD) of CO2 and water retention capacities (CRC and...
Article
Poly­ester/ cot­ton (PC) fab­ric was func­tion­al­ized with CuO dis­per­sion fol­lowed by di­ethanolamine (DEA) grafting. . The re­sult­ing PCCuO-DEA ma­te­r­ial was char­ac­ter­ized, and the in­frared spec­trum con­firmed the pres­ence of func­tional groups on the sur­face. Scan­ning elec­tron mi­croscopy in­di­cated that CuO in­ser­tion re­sulted...
Article
Catalytic ozonation of Methylene blue, Methyl Green, Methyl Orange and Methyl thymol Blue was investigated in the presence of ion-exchanged montmorillonite (NaMt and Fe(II)Mt), crude bentonite and acid-activated counterparts. An original approach never tackled so far consisted in correlating the basicity and hydrophilic character to the dye-catalys...
Article
This paper reports the synthesis and modification of novel core-shell based Hydrochar with improved affinity towards CO2. This was achieved through encapsulation within ZnO shell, followed by chemical grafting to an organic moiety bearing terminal diethanolamino groups and further dispersion of Cu0 nanoparticles. Characterization through nitrogen a...
Article
In this study, two polyester nonwovens PET1 and PET2 were functionalized and designed via grafting of PAMAM( NH⁠2)⁠4 as dendrimers (Dr) and 3-(aminopropyl)triethoxysilane (APTES) flowed by the incorporation of copper (Cu) and silver (Ag) nanoparticles, with the aims reducing toxic molecules, dissociated particles and bacteria. The obtained nonwoven...
Article
In this work, for the first time, a grafting of 3-aminopropyltriethoxysilane (APTES) followed by incorporation of iron nanoparticles (Fe-NPs) was used for the functionalization of graphene oxide (GO). Changes in stability, structural, morphological, thermal and catalytic properties of the resulting GO/APTES/Fe material were investigated by scanning...
Article
Full-text available
An efficient study of carbohydrate-protein interactions was achieved using multivalent glycodendrimer library. Different dendrimers with varied peripheral sugar densities and linkers provided an arsenal of potential novel therapeutic agents that could be useful for better specific action and greater binding affinities against their cognate protein...
Article
Full-text available
A novel functional polyester fabric (PF) was successfully prepared by a facile method. PF were coated by copper oxide (CuO) followed by chemical grafting of 3-chloropropyltriethoxysilane (ClPTES) and diethanolamine (DEA). The morphology and structure of the resulting material PF@CuO–Si–N(OH)2 was characterized by X-ray diffraction, scanning electro...
Article
A facile and eco-friendly method was developped to prepare microporous CuO@Ag0 core-shell with high catalytic and antibacterial activities. Scanning and transmission electron microscopy revealed a preponderance of nearly spherical 50 nm particles with slight structure compaction. Comparison of the hysteresis loops confimed the structure compaction...
Article
A novel, eco-friendly and cost-effective method involving cotton fabric (CF) coating with copper oxide and grafting of 3-chloropropyltriethoxisilane and diethanolamine resulted in a multifunctional material (CF@CuO-Si-N(OH)2). The latter exhibited catalytic activity in 4-nitrophenol (4-NP) reduction, methylene blue degradation and antibacterial act...
Article
This work focuses on the preparation and modification of mesoporous SBA-15 silica by in-situ polymerization of various amounts of aniline. The resulting nanocomposite denoted as pani/SBA-15 displayed affinity towards CO2. X-ray diffraction, argon sorption isotherms at 87K, thermogravimetric analysis, Fourier transform infrared spectroscopy and scan...
Article
The effect of acid activation on bentonite affinity toward carbon dioxide (CO2) and hydrogen (H2) was investigated at ambient conditions. Characterization through X-ray diffraction and fluorescence, thermal gravimetric analysis, nitrogen adsorption-desorption isotherms, Fourier Transform Infrared spectroscopy and differential scanning calorimetry a...
Article
Omega zeolite was synthesized by a hydrothermal method and then modified by ionic exchange using Na, Ca, K, Mg, Co and Cu cations. Analyses through CO2- and H2O-TPD revealed an improvement of the Lewis basicity as compared to the parent zeolite. CO2 adsorption was found to take place on three types of sites: i. strong sites on lattice oxygen locate...
Article
This work was achieved to investigate the effect of both aminopropyltriethoxysilane (APTES) grafting and cobalt particles incorporation on the CO2 adsorption behavior of cocoa shell based hydrochar (HC). Electron microscopy and measurements using nitrogen adsorption-desorption isotherms showed a structure swelling after APTES grafting, followed a c...
Article
Metal-organoclays (MOC) were prepared through incorporation of Boltorn polyol dendrimer H30 in Na+ exchanged montmorillonite (NaMt), followed by in-situ dispersion of Cu0 and Pd0 nanoparticles (CuNPs and PdNPs). The organoclays displayed high CO2 retention capacity (CRC) of 3.6–11.1 micromol/g, but metal incorporation induced a significant increase...
Article
This paper focuses on the preparation of amine-functionalized-mesoporous silica SBA-15 using the post-synthesis method. Several aminosilanes containing mono, di- and tri-amine were tested to compare their structural/textural properties and their catalytic performance. The functionalization of the catalysts was investigated using X-ray diffraction (...
Article
The presence of pollutants in the environment, food, drinking water and other compounds in direct or indirect contact with humans is a major environmental issue. In this regard, a privileged place reverts to the capture or decomposition of pollutants without producing traces of residual toxins. An interesting approach for depollution is the use of...
Article
Copper-loaded organo-Montmorillonite showed improved affinity towards hydrogen under ambient conditions. Clay ion exchange with a propargyl-ended cation followed by thiol-yne coupling with thioglycerol resulted in porous structure with a 6 fold higher specific surface area, which dramatically decreased after copper incorporation. X-ray diffraction...
Article
Full-text available
Copper-loaded organo-Montmorillonite showed improved affinity towards hydrogen under ambient 17 conditions. Clay ion exchange with a propargyl-ended cation followed by thiol-yne coupling with 18 thioglycerol resulted in porous structure with a 6 fold higher specific surface area, which dramatically 19 decreased after copper incorporation. X-ray dif...
Article
This paper focuses on the synthesis of polyol/MCM-48 nanocomposite materials with different percentage of polyalcohol dendrimer H20. The obtained materials have been used for CO2 adsorption. CO2-TPD analysis shows that the samples containing 1 and 3 wt% of H20 dendrimer have low CO2 adsorption capacity due to the occupation of active site, while th...
Article
Full-text available
Three mesoporous silica SBA-16, SBA-15 and MCM-41 with different structures and porosities were synthesized via hydrothermal method and their interactions with carbon dioxide (CO2) were investigated through thermal programmed desorption (TPD) and differential scanning calorimetry (DSC). TPD measurements provided precise assessment of the intrinsic...
Article
Full-text available
Low-cost biosourced hybrid microporous adsorbents with improved affinity towards carbon dioxyde (CO2) were prepared through the incorporation of various amounts of glucosylated dendrimer into bentonite- and montmorillonite-rich composite materials. Characterization by nitrogen adsorption–desorption isotherms, surface specific and pore size analyses...
Article
Nanoparticles of Cuo (CuNPs) and Feo (FeNPs) were dispersed in SBA-16-like silica, resulting metal-loaded materials (Cu/SBA-16 and Fe/SBA-16) with improved affinity towards hydrogen. Electron microscopy and X-ray diffraction showed that MNP dispersion occurs mainly inside SBA-16 channels. MNP incorporation was found to confer affinity to the silica...
Article
Nanoparticles of Cuo (CuNPs) and Feo (FeNPs) were dispersed in SBA-16-like silica, resulting metal-loaded materials (Cu/SBA-16 and Fe/SBA-16) with improved affinity towards hydrogen. Electron microscopy and X-ray diffraction showed that MNP dispersion occurs mainly inside SBA-16 channels. MNP incorporation was found to confer affinity to the silica...
Article
Changes in textural and electrical properties of SBA-15-like silica after iron nanoparticles (Feo-NPs) incorporation were investigated. Electron microscopy showed that Feo-NPs dispersion occurs mainly inside the channels of SBA-15. The capacitance, conductance and relaxation phenomenon of the materials were studied by means of impedance spectroscop...
Article
A core-shell material was prepared by using SBA-15 crystallites as cores for the growth of a ZnO shell, followed by Cu0 dispersion. The resulting Cu/SBA-15@ZnO nanostructure displayed higher specific surface area (SSA) and higher number of smaller pores as compared to the starting materials. Dispersion of fine Cu0NPs induced a compaction of the hos...
Article
In this paper, a new synthetic strategy towards functionalized ZnO-HMD@ZnO-Fe/Cu core-shell using sol-gel process modified by chemical grafting of hexamethylenediamine (HMD) on the core and in-situ dispersion of Cu⁰/Fe⁰ as metallic nanoparticles (M-NPs) on the shell. The as-prepared core-shell materials were fully characterized by transmission elec...
Article
Truly reversible capture of hydrogen was achieved at ambient conditions on Pd-loaded organo-montmorillonites obtained by photo-addition of different thiols on propargylated-TRIS cations already grafted on the clay surface. TEM insights showed that more than 90% of Pd0 incorporated occur as 0.3-0.5 nm subnanoparticles (PdSNPs). XPS and NMR analyses...
Article
Full-text available
Iron nanoparticles were incorporated into zinc oxide powders by an in-situ dispersion method. The products were fully characterized by X-ray diffractometry, diffuse reflectance, FTIR spectrophotometry and complex impedance spectroscopy. The XRD patterns agreed with that of the ZnO typical wurtzite structure, the sharp diffraction peaks indicating g...
Article
Aluminosilicate catalysts (Bentonite, illite-montmorillonite mixture ([I + M]), kaolinite and Clinoptilolite) showed catalytic activity in the electroreduction of nitrates using stainless steel electrodes, in the presence of salts. Addition of NaCl and KCl resulted in process enhancement, affording nitrate removal yields of up to 95% after 30–60 mi...
Article
The structural, optical and electrical properties of molybdenum nanoparticles (Mo-NPs)-loaded anatase TiO2 were investigated using x-ray diffraction, UV–Vis diffuse reflectance, and Fourier transform infrared and complex impedance spectroscopy. x-ray diffraction showed that Mo-NPs incorporation induced a decrease in particle size from 30 nm to 21 n...
Article
Hydrothermal synthesis using two gel compositions: i. 1 SiO2: 0.059 P123: 56.130 HCl: 607.638 H2O; ii. 1 SiO2: 0.006 P123: 0.013 F127: 42.439 HCl: 442.876 H2O, resulted in highly crystalline SBA15 and SBA16 like silica with intrinsic activity in the catalytic ozonation of oxalic acid (OA), phenol (φOH) and Orange G (OG) in water at room temperature...
Article
Full-text available
Lactic acid (LA) removal from aqueous media was investigated using CO3-Mg-Al layered double hydroxides (CO3-LDHs) at various Mg/Al ratios (1:1 to 5:1), temperatures (38-48 °C), and contact times. Mg-rich LDHs turned out to be fairly effective and did not undergo solubilization for pH higher than 4-5. LA adsorption was preponderant at acidic pH and...
Article
Mo/DAN/ZnO was successfully synthesized through ZnO impregnation in a 1,5-diaminonaphthalene (DAN) solution followed by a dispersion of molybdenum nanoparticles (MoNPs). The resulting material was characterized by X-ray powder diffractometry, transmission electron microscopy, UV-diffuse reflectance, FT-IR spectrophotometery and complex impedance sp...

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