Removal of Cr(VI) by polyaniline embedded polyvinyl alcohol/sodium alginate beads − Extension from water treatment to soil remediation

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

“…Electrostatic attractions between these positively charged sites and Cr(VI) anions (i.e., HCrO 4 − and Cr 2 O 7 2− ) could enhance Cr(VI) removal [ 140 ]. Oxidation of –NH– to =N– by Cr(VI) generates Cr(III) [ 141 ], which has strong affinity toward amine groups [ 142 ]. Besides, these nitrogen-containing groups could also improve the hydrophilicity and the charge density of the polymer surfaces, which are helpful for Cr(VI) removal [ 137 ].…”

“…The presence of characteristic peaks of Cr(III) (~34.6%) confirmed the reduction of Cr(VI) by amine groups on the GO-HBP-NH 2 -TEPA ( Figure 7 ). Carboxyl and hydroxyl groups are effective for Cr(III) removal through complexation or chelation mechanisms [ 30 , 141 ]. The doping of anions into the structure of polymers can enhance Cr(VI) via anionic exchange mechanism, and Cl − and SO 4 2− are the two most common doping anions [ 18 , 144 ].…”

Adsorption of heavy metal ions in water by surface functionalized magnetic composites: a review

“…In addition, polymer-based adsorption materials can not only absorb heavy metal ions in water but also have good application effects in soil. 132,133…”

“…In addition, polymer-based adsorption materials can not only absorb heavy metal ions in water but also have good application effects in soil. 132,133 Graphene oxide (GO) is the oxidation product on the surface of graphene. Graphene oxide has multiple functional groups, strong acidity, and possesses high adsorption capacity for basic compounds and cations.…”

Design and synthesis of hydrophobic mixed organogels with complementary hydrogen-bond donor–acceptor sites: removal of heavy metal ions Hg2+, Cd2+ and Pb2+ from aqueous solution

“…21,22 Interestingly, though LMWGs have shown extensive metallogel formation properties, there are only limited reports where LMWGs are being used in water remediation through the adsorption of heavy metals. However, there are some reports where alginate or cellulose-based gels [23][24][25] have been used for water remediation. Recently a metalloproteinbased hybrid hydrogel was reported for Cd(II) removal.…”