Cationized starch-based material as a new ion-exchanger adsorbent for the removal of C.I. Acid Blue 25 from aqueous solutions
University of Franche-Comté, Laboratory of Chrono-Environment, UMR UFC/CNRS 6249, USC INRA, Place Leclerc, 25030 Besançon cedex, France. Bioresource Technology
(Impact Factor: 4.49).
12/2008; 99(16):7573-86. DOI: 10.1016/j.biortech.2008.02.011
This article describes the use of a cationized starch-based material as new ion-exchanger adsorbent for the removal of C.I. Acid Blue 25 (AB 25) from aqueous solutions. Batch adsorption studies concerning the effects of contact time, pH and temperature are presented and discussed. Adsorption experimental data showed that: (i) the process was uniform and rapid: adsorption of dye reached equilibrium in 50 min in the wide pH range of dye solutions; (ii) adsorption kinetics followed the pseudo-second order model; (iii) the Langmuir model yielded a much better fit than the Freundlich model for the dye concentration range under study; (iv) this adsorbent exhibited interesting adsorption capacities: on the basis of the Langmuir analysis, the maximum adsorption capacity was determined to be 322 mg of dye per gram of material at 25 degrees C; (v) the adsorption capacity decreased with increasing temperature; and (vi) the negative value of free energy change indicated the spontaneous nature of adsorption.
Available from: Feisal Kroushawi
- "These poly-hydroxylated macromolecules present interesting dynamic supramolecular associations facilitated by inter-and intramolecular hydrogen bonding resulting in molecular-level capsules, which can act as templates for nanoparticle growth.  So, following our previous studies on green synthesis of Nps, [26À28] herein, we report a facile, green, low-cost and homemade method for preparing stable ZnO Nps by starch-rich potato extract, without any additives such as reducing agent, acids and organic solvents. To the best of our knowledge, green approach using potato extract is used for the first time as a reducing as well as capping agent for the synthesis of highly pure ZnO Nps. "
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ABSTRACT: A facile green recipe was developed to synthesise highly pure, safe and durable zinc oxide nanoparticles (ZnO Nps) using homemade starch-rich potato extract. The ZnO Nps were synthesised using zinc nitrate and potato extract, and the whole reaction is carried out for 30 min at 80 °C. In the synthesis, starch-rich potato extract acted as the reducing agent and as a stabilising layer on freshly formed ZnO Nps. Hexagonal (wurtzite) shaped ZnO Nps with size about 20 ± 1.2 nm were synthesised and characterised using X-ray diffraction, transition electron microscope and scanning microscopy analyses. Fourier transform infrared spectral analysis indicated that highly pure ZnO nanopowders were obtained at higher temperatures. The use of environmentally benign and renewable material as the respective reducing and protecting agents, starch-rich potato extract, as well as a gentle solvent medium (H2O), offered a simple and quite efficient procedure for the synthesis of ZnO Nps in neutral medium with promising potential for biological and biomedical applications.
Journal of Experimental Nanoscience 05/2015; DOI:10.1080/17458080.2015.1039610 · 0.98 Impact Factor
Available from: Shaogui Yang
- "The gradual decrease of G with the temperature getting lower means the adsorption is more spontaneous at low temperature , which is consistent with the fact that it is an exothermic reaction (H < 0). In addition, the change in adsorption enthalpy for physisorption is in the range of −20 to 40 kJ/mol, whereas the values of chemisorption are between −400 and −80 kJ/mol  . In terms of this finding, the adsorption process cannot be strictly defined as physical or chemical for the negative H ranged from −40.9 to −23.82. "
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ABSTRACT: Three kinds of layered double hydroxides (LDHs), including Ni/Al-LDH, Mg/Al-LDH and Co/Al-LDH, were adopted in this research to study the adsorption process of reactive brilliant red X-3B. Factors affecting adsorption such as contact time and temperature were investigated. The adsorption kinetic data fit well into the pseudo-second-order model, while the adsorption isotherm followed the Langmuir model. The thermodynamic tests indicated spontaneous and exothermic nature of X-3B adsorption. In order to examine the adsorption mechanism, pH effect was investigated and adsorbents and adsorption products of Ni/Al- and Mg/Al-LDHs were characterized further by several physicochemical techniques in view of their relative large capacity. The pH effect tests illustrated that electrostatic reaction and hydrogen bonding between dye molecules and LDH layers may be the major mechanisms involved in adsorption. The FT-IR analysis revealed that there was ion exchange during the adsorption process. The XPS, TG, and NMR experiments further proved that the hydrogen bonding between the adsorbent and adsorbate played the dominant role in this process and the ─SO3 was the interaction site.
Applied Surface Science 04/2014; 301. DOI:10.1016/j.apsusc.2014.02.073 · 2.71 Impact Factor
Available from: Giuseppe Trunfio
- "Concentrations of TOC were measured by a portable photometer (Spectroflex 6100 model, WTW, Alè s, France) using test kits (TOC Cell test, Merck, Darmstadt, Germany). Organics were analysed by an accredited analysis laboratory (LCDI, Marange, France) using standard French protocols    "
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ABSTRACT: Among organic pollutants, four families have been listed as priority substances by the European Agency, namely polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), chlorophenols (CPs) and alkylphenols (APs). In this study, sorption onto a non-conventional cyclodextrin-based material alone as well as in combination with advanced oxidation using a UV-ozone process as pre-treatment was applied for the removal of PAHs, VOCs, CPs and APs from industrial effluents. After the various treatments proposed, we present the abatements obtained in the levels of chemical pollution monitored by a complete chemical analysis, and total organic carbon (TOC) and chemical oxygen demand (COD) measurements. High levels of pollutant removal were attained with the combined use of oxidation and sorption. The treatment led to the almost total elimination of organics such as chloroform, 1,2-dichlorobenzene, 2,4,6-trichlorophenol, nonylphenol and phenanthrene. The treatment also lowered TOC and COD by more than 84% and 93%, respectively. This combined lab-scale process using a non-conventional material could constitute an advantageous technology for removing organic pollutants when scaled up to treat polycontaminated industrial effluent.
Journal of the Taiwan Institute of Chemical Engineers 03/2014; 45(2):603–608. DOI:10.1016/j.jtice.2013.06.023 · 3.00 Impact Factor
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