Removal of Cr(VI) from alkaline aqueous solutions using chemically modified magnetic chitosan resins

A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

“…Chitosan has abundant amounts of the 43 amine (À ÀNH 2 ) group, which has a great affinity toward heavy 44 metal ions and then could be an adsorbent for Cr(VI). The preparation methods of magnetic chitosan have been reported 46 with various methods such as magnetite synthesis followed by coating [18], the incorporation of Fe(II) in chitosan followed by 48 reduction [19], and layer by layer assembly [20]. However, most of 49 those methods are complex and require multistep preparation and 50 purification.…”

Preparation and characterization of multi-walled carbon nanotubes/chitosan nanocomposite and its application for the removal of heavy metals from aqueous solution

“…Chitosan, a polysaccharide biopolymer obtained from the deacetylation of chitin, has been widely used in medical applications because it can not only be economically processed from chitin but is also nontoxic, biocompatible, and biodegradable [46,47]. Chitosan is known to have good complexing ability through specific interactions of its amino groups with heavy metals from various waste waters [48][49][50][51][52]. Carbon nanotubes were modified with chitosan and used for different applications such as the adsorption of congo red [53], the determination of copper (II) by anodic stripping voltammetry [54], and biosensors for different molecules such as hydrogen peroxide [55] and cholesterol [56].…”

Chemical treatment of teff straw by sodium hydroxide, phosphoric acid and zinc chloride: adsorptive removal of chromium

“…Teff has very high amount of calcium content and is an excellent source of vitamin C. In the literature, a number of agricultural residues have been tested as adsorbent for chromium removal (Ali and Gupta 2006;Ali 2010Ali , 2012Ebrahimi et al 2015;Kunquan et al 2015;Shiow-Tien et al 2014;Venkatesan et al 2014;Doan et al 2008;Martinez et al 2015;Huang et al 2015;Santos et al 2016;Ali 2012;Elwakeel 2010). However, only few studies have been reported on use of teff straw as an adsorbent because of its less familiarity in scientific research world (Mulu 2013;Bezuayehu et al 2014).…”