Magnetic arginine-functionalized polypyrrole with improved and selective chromium(VI) ions removal from water

Polypyrrole–polyaniline copolymer coated green rice husk ash as an effective adsorbent for the removal of hexavalent chromium from contaminated water

“…6 It is also evident from XRD of PPY-PANI@RHA after adsorption of Cr(VI) showed no significant characteristic changes compared to pure PPY-PANI@RHA adsorbent. 50 FTIR analysis. The chemical structures of the RHA and PPY-PANI@RHA before/after Cr(VI) adsorption were investigated by FTIR analysis in the wavenumber range of 400-4000 cm -1, and corresponding findings are displayed in Fig.…”

“…44 Therefore, different approaches have been directed to conducting polymers, such as grafting of polyaniline to a non-conducting poly-(p-phenylene 5 terephthalamide) polymer, pyrrole-styrene graft copolymer, 46 etc. In addition, reports are also available on the adsorption of Cr(VI) ion from contaminated water using polypyrrole/calcium rectorite composite, core-shell Fe O /PANI microspheres, 34 PPy/Fe O 4 magnetic nanocomposite, 38 capsular polypyrrole hollow nanofibers, 30 chitosan/polypyrrole, 47 polyaniline@Ni(OH) 2, 48 flake-like polyaniline/montmorillonite nanocomposites, 49 Fe 3 O 4 @Arg-PPy, 50 sodium alginate-polyaniline nanofibers, 51 bacteria cell templated porous polyaniline, 42 alkyl-substituted polyaniline/chitosan, 52 polypyrrole-modified layered double hydroxides, 53 graphene/SiO 2 @polypyrrole, 54 and PANI-coated electrospun adsorbent membrane. 55 In recent years, attentions have been focused on harnessing wide variety of low-cost natural materials and evaluate their efficiency and adsorption capacity in removing harmful contaminants in water.…”

Effective Adsorption of Hexavalent Chromium and Divalent Nickel Ions from Water through Polyaniline, Iron Oxide, and Their Composites

“…Moreover, at lower pH negatively charged sites like the oxygen of iron oxide and the nitrogen of amine groups in the chains of PANI and composites are protonated. These positively charged sites of adsorbent cause electrostatic interactions with negatively − ions, thus adsorption becomes enhanced[69]. However, in basic medium, deprotonation of these sites causes electrostatic repulsions between adsorbents and dichromate ions, hence causing adsorption to decrease in basic medium.…”

Perspectives regarding metal/mineral-incorporating materials for water purification: with special focus on Cr(vi) removal

“…The FTIR, VSM, XRD, and TEM analyses of the Fe 3 O 4 @ Arg-PPy nanocomposite imply the successful implementation of arginine and Fe 3 O 4 into PPy. 102 The batch experimental results showed a highly pH-dependent removal of Cr(VI) at the optimum pH value of 2. The process of adsorption was 103 The results show a high dependency on the pH value with increasing adsorption in correspondence to decreasing pH values.…”