9 research outputs found
Removal of toxic Cr(VI) from water by a novel magnetic chitosan/glyoxal/PVA hydrogel film
No full text<p>Coprecipitation of FeCl<sub>2</sub> and FeCl<sub>3</sub> produced magnetic iron nanoparticles (Fe<sub>3</sub>O<sub>4</sub>NPs). The latter was dispersed in an acetic acid solution of chitosan (CS), and then cross-linked with glyoxal, followed by addition of polyvinyl alcohol (PVA). The resulting gel was neutralized with NaOH giving our novel Fe<sub>3</sub>O<sub>4</sub>NPs/CS/glyoxal/PVA hydrogel film. This film was used as an efficient and reusable adsorbent for the removal of toxic Cr(VI) from water, at a rather wide range of pH. The absorbent film was characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared, and energy dispersive X-ray. Langmuir isotherm model suggested maximum Cr(VI) adsorption occurring at room temperature. Kinetic studies suggested a <i>pseudo</i>-second-order model for the adsorption. Our Fe<sub>3</sub>O<sub>4</sub>NPs/CS/glyoxal/PVA hydrogel is hoped to serve as a promising Cr(VI) adsorbent in wastewater treatment technology.</p
Synthesis, characterization, X-ray structural analysis and study of oxidative properties of propyltriphenylphosphonium bromochromate
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An efficient and mild carboxylation of multiwall carbon nanotubes using H2O2 in the presence of heteropolyacid
No full textAqueous Media Preparation of Pyrido[d]pyrimidines Over Calcined TiO2- SiO2 Nanocomposite as an Efficient Catalyst at Ambient Temperature
No full textSynthesis, complexation and use of calix[4]crown-6 as a novel neutral ionophore for the preparation of a selective and sensitive PVC-membrane potentiometric sensor for Ba2+ ion
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