Removal of chromium(VI) Ions from aqueous solutions with protonated crosslinked chitosan

Abstract

This articles provided information on Cr(VI) adsorption onto protonated crosslinked chitosan particles (PCPs) as an adsorbent. Batch experiments were performed to investigate the effects of the adsorbent dosage, pH, contact time, initial Cr(VI) concentration, and coexisting ions on the adsorption capacity and the regeneration ability of the adsorbent. The equilibrium data fit well with the Freundlich and Redlich–Peterson isotherm models. The presence of other anions weakened Cr(VI) adsorption, especially high‐valence anion such as sulfate. PCP could be regenerated well by a 0.1N sodium hydroxide solution. Electrostatic attraction was the main driving force for Cr(VI) adsorption. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Thermodynamics, kinetics, and activation energy studies of the sorption of chromium(III) and chromium(VI) to a Mn3O4 nanomaterial

“…Currently, a variety of methods have been developed to remove chromium from wastewaters, which include precipitation, ion exchange, reverse osmosis, electro-chemical precipitation, and adsorption [2, 4–6, 18, 20–22]. In addition, geopolymers, activated clays, chemical precipitation, and co-precipitation with metal hydroxides have also been investigated for the removal of chromium(VI) and chromium(III) from aqueous solution [8, 26, 27].…”

“…However, most of these methods have major drawbacks, such as high costs. Overall, adsorption has proven to be one of the most effective methods for the removal of toxic metals from wastewaters due to its cost-effectiveness [3, 5, 16, 20]. Many low-cost adsorbents have been studied such as, steel wool, sawdust, pine needles, shells, cactus leaves, magnesium pellets and iron oxide pellets among others.…”

Hexavalent chromium removal in contaminated water using reticulated chitosan micro/nanoparticles from seafood processing wastes

“…In the last years very interesting works have been published concerning the removal of hexavalent chromium using adsorbent materials that can reduce Cr(VI) to the less or nontoxic Cr(III) and simultaneously adsorb the reduced Cr(III) (Bellú et al, 2010;Gu et al, 2012;Huang et al, 2013;Park et al, 2008;Qiu et al, 2014aQiu et al, ,b,c,d, 2015Sankararamakrishnan et al, 2006;Sivakami et al, 2013;Xu et al, 2014;Zhang et al, 2010Zhang et al, , 2013Zhu et al, 2012Zhu et al, , 2014. These adsorbents not only act as electron donors for the Cr(VI) reduction, but also have active sites for Cr(III) adsorption.…”

“…The adsorption of a metal ion on chitosan depends strongly on the pH of the solution (Schmuhl et al, 2001). Several authors analyzed the adsorption of Cr(VI) onto chitosan and modified chitosan particles (Hena, 2010;Huang et al, 2013;Sankararamakrishnan et al, 2006;Sivakami et al, 2013;Zhang et al, 2013).…”

Polymers for biomedical applications

“…Conversely, applications that do not look strictly biomedical at first sight offer potential for substantial improvement of health and sanitary conditions, and this is the reason why we include here articles on removal of chromium from water such as in Huang et al 8 The broad scope of polymeric materials for biomedical applications is captured on a regular basis by the Journal of Applied Polymer Science, as this special issue shows. We are looking forward to continuously higher quality and quantity of submissions in this broad area, which is crucial from an applications standpoint and generates enormous industrial investment as well as startups, some examples of which we are capturing in our ongoing interview series on materialsviews.com.…”