Gabriela Carja

Gabriela Carja
Gheorghe Asachi Technical University of Iasi | TU Iasi · Department of Chemical Engineering

About

144
Publications
18,757
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
2,443
Citations
Citations since 2016
29 Research Items
1424 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200

Publications

Publications (144)
Article
Full-text available
Heterostructures formed by close conjunctions of plasmonic metal nanoparticles and non-plasmonic (2D) lamellar nanostructures are receiving extensive interest as solar-light-driven photocatalysts for environmental pollutant remediation. Herein, the conjunction of plasmonic Au or Ag and Ga-substituted hydrotalcite are obtained by exploiting the mani...
Article
Full-text available
Artificially designed heterostructures formed by close conjunctions of plasmonic metal nanoparticles (PNPs) and non-plasmonic (2D) lamellar nanostructures are receiving extensive interest. The synergistic interactions of the nanounits induce the manifestation of localized surface plasmon resonance (LSPR) in plasmonic metals in the specific environm...
Chapter
Pollution generated by wastewater containing inorganic pollutants, such as heavy metals, has always been considered a real problem for our planet. Therefore, the removal of these micropollutants from polluted water is a valuable intervention to preserve human health and the environment. Many conventional methods are used today to treat wastewater,...
Article
High-risk arsenic contamination found in aqueous system is reported across the world and causing severe environmental issues. In this study, the Mg-Al Layered Double Hydroxide (LDH) modified by sulphur species (LDH-S) was found exhibiting high effectivity and selectivity in As(V) removal owing to the strong interaction between embedded HS⁻ and AsO4...
Article
Full-text available
In this study, Mg–Al layered double hydroxide (MgAl-LDH) was synthesized by the urea hydrolysis method and used as sorbent to remove phosphate from aqueous solutions. Structural and morphological studies show that MgAl-LDH was prepared successfully with good crystallinity. The influences of sorbent dosage, time, initial concentrations, solution pH,...
Article
Full-text available
In this study, the adsorption of Congo red dye in an aqueous solution on two synthetic clay adsorbents, MgAl-LDH (2:1) and MgAl-LDH (3:1), was investigated using batch system experiments. The adsorbents' characterization was carried out by various techniques such as scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform...
Article
Full-text available
Layered double hydroxides (LDHs), known as a class of anionic clays, have attracted considerable attention recently due to their potential applications in different areas as catalyst materials, energy materials, and adsorbent materials for environmental remediation, especially for anionic pollutant removal. In this study, magnesium aluminum layered...
Article
Full-text available
Layered double hydroxide (LDH), also known as hydrotalcite or anionic clays, have attracted attention in recent years due to their applications in various fields, particularly in the water treatment sector. In this work, the MgAl layered double hydroxide was synthesized by urea method and used for the removal of methyl orange dye (MO) from aqueous...
Article
Full-text available
Micromorphology characteristics of layered double hydroxides are important to establish their performances to act as adsorbents and catalysts/photocatalysts. Herein, we report the fabrication of ZnFeAl layered double hydroxides (LDHs) (defined by a molar ratios Zn/Fe/Al 2/0.5/0.5), in a tailored aqueous-organic synthesis medium, by using the coprec...
Article
Full-text available
The objective of this work is to determine the kinetic and thermodynamic properties of adsorption of Pb(II) from aqueous solutions by synthetically prepared MgFeAl-CO3 as layered double hydroxide (LDH) adsorbent. Compared to other adsorbents for heavy metal removal from aqueous solutions, LDH materials possessed many advantages such as nontoxic syn...
Article
Herein we report Ce-Ti/layered double hydroxides (LDHs) heterostructures and their transformation into the mixed oxides (MMOs) by using the reconstruction of ZnAlLDH and MgAlLDH in an aqueous solution containing TiO2 nanoparticles and Ce(SO4)2·4H2O, followed by their calcination. The novel heterostructures were investigated by powder X-ray diffract...
Article
The quest to provide clean water has led to a tremendous boost in the synthesis of advanced photocatalysts that are able to decontaminate water by harvesting the solar energy. Herein, a tandem of Pt or both Pt-Ag nanoparticles on layered double hydroxides (LDH) photocatalysts were obtained via a green chemical procedure in which LDH serve a dual fu...
Preprint
Full-text available
Nanoscaled self-assemblies with engineered architectonics are important for obtaining advanced materials with specific applications in nanotechnology. We investigated here the morphology features at the nanoscale of the assemblies of the mixed oxides obtained through the thermal transformation of Zn ²⁺ Me ³⁺ (Me=Al/Ga) layered double hydroxides (LD...
Article
Full-text available
Gold nanostructures (AuNP) are important as strong platforms for targeted therapeutic and diagnostic applications. Tireless effort has been devoted nowadays to explore the multifunctionality of AuNP in multicomponent biostructures. Herein, we report the fabrication of horseradish peroxidase enzyme (HRP)-AuNP/ZnAlLDH heterostructure by the facile sy...
Article
Full-text available
Both photocatalytic and enzymatic degradation of phenol were studied in order to evaluate and to compare the catalytic potential of both methods. For this, solar-sensitive ZnMe (Me = Al, Cr) layered double hydroxides (LDHs) and their derived mixtures of mixed oxides (MMOs) were synthesized via co-precipitation and calcination at 750 °C, while the c...
Article
New Ti-MCM-48 and CeTi-MCM-48 photocatalysts were obtained by impregnation of the MCM-48 silica support synthesized by a hydrothermal process with aqueous solution of Ti and Ce precursors. The immobilization of metal cations presented a low effect on the porosity, morphology and structure of MCM-48 mesoporous silica support as was evidenced by N2 a...
Article
Full-text available
A key target to boost solar-to-chemical conversion processes is to fabricate an efficient solar-light responsive photocatalyst. Herein, we report the in-situ synthesis of nanoparticles (NPs) of Bi2O3 directly on Zn-based layered double hydroxides (LDHs) framework. The in-situ synthesis of Bi2O3NPs is done at room temperature, is ligand-free and exp...
Article
Photocatalytic decomposition of dangerous organic contaminants using irradiation with sunlight is of great importance for environmental remediation and human health. In this work we present Zn2+Me3+(Me=Al/Ga)LDHs doped with Ga2O3 and In2O3 and their derived mixtures of mixed oxides (MMOs) as novel solar-light-driven photocatalysts for degrading a m...
Article
Full-text available
The removal of organic pollutants is nowadays a very challenging aspect of the environmental research. There are strong interests to develop novel semiconducting photocatalysts able to efficiently promote advanced oxidation reactions. The development of photocatalysts based on the mixtures of mixed oxides derived from layered double hydroxides (LDH...
Article
Full-text available
We report here the fabrication of novel semiconductor photocatalysts with high efficiency in the advanced oxidation reactions. Layered double hydroxides (LDHs) are nontoxic and environmental friendly anionic claysstudied due to their photoresponses under UV, visible and solar irradiation. In this work ZnFeAlLDH and the derived mixed oxides obtaine...
Article
Full-text available
A facile, environmentally friendly route for the synthesis of ZnAlLDH/g-C3N4/CuONP composite was demonstrated by exploiting the specific behaviour of the freshly calcined ZnAlLDH/melamine hybrids in Cu(OAc)2 aqueous solution. ZnAlLDH was synthesised and thereafter calcined at 550 °C in air, in the absence or in presence of melamine, to obtain the m...
Article
Gold nanoparticles (AuNPs) self-coupled on semiconductors have attracted extensive attentions in the field of catalysis, however, the progress in understanding and optimizing their photocatalytic performance in response to solar light irradiation is limited. In this paper, a series of AuNPs with Zn2Al-layered double hydroxide (LDH) as support was f...
Article
Gold nanoparticles (AuNPs) self-coupled on semiconductors have attracted extensive attentions in the field of catalysis, however, the progress in understanding and optimizing their photocatalytic performance in response to solar light irradiation is limited. In this paper, a series of AuNPs with Zn2Al-layered double hydroxide (LDH) as support was f...
Article
Gold nanoparticles (AuNPs) self-coupled on semiconductors have attracted extensive attentions in the field of catalysis, however, the progress in understanding and optimizing their photocatalytic performance in response to solar light irradiation is limited. In this paper, a series of AuNPs with Zn2Al-layered double hydroxide (LDH) as support was f...
Article
A growing interest exists nowadays to develop new photocatalysts able to use the light energy for removing organic pollutants from wastewaters. This work reports the synthesis and characterisation of the MgZnFeAl layered double hydroxides (MgZnFeAl/LDHs) as novel photocatalysts for the degradation of two industrial dyes, Nylosan Navy (Nyl) and drim...
Article
Engineering complex nanocomposites that specifically target the hepatitis B virus (HBV) and overcome the limitations of current therapies such as limited efficacy and serious side effects is very challenging. Here, for the first time, the antiviral effect of engineered plasmonic gold and layered double hydroxide self-assemblies (AuNPs/LDHs) is demo...
Article
We present here a fast, facile and cost-effective route to design efficient semiconductor/LDHs heterojunction photocatalysts based on γ-Fe2O3 nanoparticles (NPs)/ZnAlFe-LDHs matrices and their use as novel photocatalytic systems for wastewater remediation. Different compositions of ZnAlFe-LDHs were tailored by controlling the isomorphous substituti...
Article
This work presents novel photocatalysts containing Ti and/or Ce embedded in the mesoporous silica framework (TiSiMCM-48, CeSiMCM-48 and CeTiSiMCM-48) that were prepared via a facile sol-gel process in the presence of ionic structure directing agents. The structural properties of the obtained materials were analyzed by X-ray diffraction (XRD), nitro...
Article
New composite materials based on biocompatible polymers type chitosan (CS), poly(vinyl alcohol) (PVA) and hydrotalcite-like anionic clays (MgAlLDH) have been prepared and their rheological and structural properties have been investigated. The viscoelastic properties of CS/PVA/MgAlLDH hybrids were studied at 37 �C in different conditions of pH. The...
Conference Paper
Full-text available
The removal of organic pollutants is nowadays a very challenging aspect of the environmental research. There are strong interests to develop new photocatalysts with specific semiconductor properties, able to promote advanced oxidation reactions. Nowadays, the development of photocatalysts based on the mixed oxides derived from layered double hydrox...
Conference Paper
In this work we report self- Assemblies of nanoparticles of BI2O3 and layered double hydroxides (LDHS) obtained by exploiting the manifestation of the "structural memory effect" of znalldh and zncrldh anionic clay matrices in BI(NO3)3 aqueous solutions. controlled thermal treatment of BI2O3/znalldh and BI2O3/ZnCrLDH self- Assemblies gives rise to p...
Article
Full-text available
This work presents CuII(Sal-Ala) complex immobilized on the CuAlLDH as a novel efficient catalyst for artificial superoxide dismutase (SOD) enzyme activity and cyclohexene oxidation. The physico-chemical properties of CuII(SalAla)/CuAlLDH were investigated by XRD, XPS, FTIR, DRUV and TGA techniques. The correlation between the catalytic performance...
Article
Photocatalytic conversion of CO2 into fuels is an attractive option in terms of both reducing the increased concentration of atmospheric CO2 as well as generating renewable hydrocarbon fuels. It is necessary to investigate good catalysts for CO2 conversion and to clarify the mechanism irradiated by natural light. Layered double hydroxides (LDHs) ha...
Article
Photocatalytic conversion of CO2 into fuels is an attractive option in terms of both reducing the increased concentration of atmospheric CO2 as well as generating renewable hydrocarbon fuels. It is necessary to investigate good catalysts for CO2 conversion and to clarify the mechanism irradiated by natural light. Layered Double Hydroxides (LDH) hav...
Article
The viscometric parameters of chitosan/poly(vinyl alcohol) mixtures determined at 37°C are sensitive to polymer composition and pH changes, giving information about interpolymer complexes formation. Hybrid composites based on interpolymeric chitosan/poly(vinyl alcohol) complexes and the inorganic matrix of layered double hydroxides were synthesized...
Article
A growing interest exists nowadays to develop new photocatalysts able to use the light energy for removing organic pollutants from wastewaters. This work reports the synthesis and characterisation of the MgZnFeAl layered double hydroxides (MgZnFeAl/LDHs) as novel photocatalysts for the degradation of two industrial dyes, Nylosan Navy (Nyl) and drim...
Article
In the search for novel efficient photocatalysts for the conversion of CO2 into fuels, plasmonic photocatalysts based on the self-assemblies of silver or gold nanoparticles with [Zn3Ga(OH)8]2CO3·mH2O layered double hydroxide (Zn3Ga|CO3 LDH) were prepared and tested for the photoreduction of CO2 by H2 under irradiation with UV-visible light. Ag and...
Article
Full-text available
Dans cette étude, nous nous sommes intéressés à tester les hydroxydes doubles lamellaires (HDL) pour l'élimination des cations métalliques. Les HDL étudiés dans ce travail ont été préparés par la méthode de co-précipitation à pH constant. La caractérisation structurale et morphologique de ces matériaux a été effectuée par diffraction des rayons X (...
Article
Full-text available
Layered double hydroxides (LDHs) containing zinc and titanium in the layers with the cationic ratio of 3 were synthesized by the co-precipitation method at constant pH. The mixed metal oxides (ZnTi-MMO) obtained by the calcination of ZnTi-LDH at different temperatures were characterized together with the precursor material by X-ray diffraction (XRD...
Article
We present here Cu-II(Sal-Ala)/MgAlLDH and Cu-II(Sal-Phen)/MgAlLDH complexes as novel catalytic systems for the cyclohexene oxidation by H2O2. The physical-chemical properties of the catalysts were investigated by XRD, FTIR, UV-Vis, XPS and TGA techniques. We present evidence that the properties of the Cu-II-based complexes and the specific propert...
Article
Novel hybrids with superoxide scavenging activity were obtained from the complexes Cu(I)-Schif base derived from salicylaldehide and aminoacids (L-alanine and L-phenylalanine) immobilzed onto MgAlLDH suport. The properties and superoxide dismutase activity of the Cu(I) complexes/LDH biomimetic hybrids were investigated. The EDX, XRD, FTIR DRUV XPS...
Article
Self-assemblies of nanoparticles of CeO2/ZnTi layered double hydroxides (CeO2/ZnTi-LDH) and the derived CeO2/Zn2TiO4 systems are reported as novel efficient nano-photocatalysts for phenol degradation. The spontaneous formation and organization of nanoparticles of CeO2 on ZnTi-LDH matrix is based on a cheap, nontoxic and facile technique that invoke...
Article
Full-text available
This work reports hydrotalcite and zinc-substituted hydrotalcite (MeAlLDHs) anionic clays as novel catalytic formulations for some environmental applications regarding specific industrial coloured effluents. In this context, layered double hydroxides, covered or with tailored compositions, were synthesized, characterized using advanced analytical a...
Article
The aim of this paper is to study comparatively the structural features of two types of mixed oxides derived from chromium substituted hydrotalcite-like clay. For this purpose CrLDH clays were prepared previously, using inorganic salts of chromium as trivalent ion source and inorganic salts of magnesium/nickel as divalent ion source. This step was...
Chapter
Full-text available
The present research study presents a brief introduction of new materials based on layered double hydroxides (i.e. LDHs), and their application as sorbents for different constituents (especially, organic compounds such as dyes, aromatic hydrocarbons) from individual or mixed (L/L, G/L) aqueous environments (e.g. aqueous solutions or effluents) usin...
Article
Copper and cadmium ions were removed from aqueous solutions by adsorption onto a new organic-inorganic hybrid material. N-(aminothioxomethyl)-2-thiophen carboxamide (TAC) was covalently anchored on SBA-15 mesoporous silica. Various characterization techniques [X-ray diffraction, nitrogen adsorption-desorption, thermogravimetric analysis, Si29, C13...
Article
Layered double hydroxides (LDHs) are one of the nano ordered layered compounds. The importance of layered compound is based on their ability to retain chemical species with electrical charges compatible to those of the layers. They may be used in areas such as catalysis, industry, medicine, environmental protection, construction etc. Layered double...
Article
We report here self-assemblies of Au nanoparticles/mesoporous matrices of layered double hydroxides (Au/ZnAlLDH and Au/ZnCeAlLDH) and the derived mixed oxides as novel plasmonic photocatalysts for H2 production from water/methanol mixtures (80:20) by using solar irradiation, at room temperature. The fabrication of Au/LDHs composite is based on the...
Article
Multifunctional materials based on iron substituted anionic clays and their derived mixed oxides owning specific porous properties and textural characteristics are synthesized, characterized and tested as photocatalysts in the process of the azo-dyes degradation from aqueous solutions. The features of X-ray diffraction patterns point out the modifi...
Article
The thermal behavior of polytetrafluoroethylene (PTFE) with glass fiber and bronze additives was studied in comparison with the synthetic PTFE under air atmosphere by applying for the first time the TG–FTIR technique. The study was performed within the 50–850 °C temperature range by taking into account that this polymer is used in practice at vario...
Article
Tailoring efficient photocatalytic competences for purifying textile aqueous effluents by utilizing the collective properties of nanoassembly systems is a challenging process. We report nanoparticles of CuO on layered double hydroxide matrices (Cu/LDHs) and their derived solid solutions as new wide spectrum active nano-photocatalysts for the degrad...
Article
New inorganic ensembles type layered double hydroxides enriched with silver ions were investigated in terms of thermal behavior and structural evolution by means of TG-FTIR analysis. The studies were focused on two classes of layered precursors, actually distinguished only by the nature of the divalent metal ions, in order to correlate the influenc...
Article
The influence of the nature of the trivalent ion from the hydrotalcite like network on the structural evolution of NiLDHs to mixed oxides was studied as a function of nickel content of the clay. The substituted hydrotalcite - like clays studied in present work are described by a different composition of the layers regarding the nature of trivalent...
Article
Hybrid structures of layered double hydroxides able to incorporate, store and controlled release both Ca(II) and glutamate were fabricated by using the ability of the hydrotalcite-like anionic clay to manifest its “structural memory” in the aqueous solution of calcium glutamate. X-ray diffraction, IR spectroscopy, X-Ray photoelectron spectroscopy,...
Article
New potentially oxidation catalysts were synthesized by immobilization of Cu(Il) biomimetic complex onto amino-functionalized mesoporous SBA-15 silica supports. The copper complex with Schiff bases derived from hystidine and salicylaldehyde, was tethered onto the pores of a NH 2-functionalized silica. Characterization by XRD analysis, N 2 adsorptio...
Article
This work presents a study on the possibility of obtaining hydroxyapatite thin layers on porous polyurethane support using a modified coating method, which is based on a biomimetic technique. To investigate bone-like apatite coatings formation on polyurethane surface, two types of solutions such as supersaturated calcification solution (SCS) and mo...
Article
Full-text available
The presence of arsenic in waters, especially groundwater, has become a worldwide problem in the past decades. The current regulation of drinking water standard has become more stringent and requires arsenic content to be reduced to a few parts per