title: Removal of Cr(VI) from aqueous solution by flocculant with the capacity of reduction and chelation.
abstract: A novel agent polyethyleneimine-sodium xanthogenate (PEX) with the multifunction of reduction, chelation, flocculation and precipitation was synthesized by using polyethyleneimine (PEI), carbon disulfide (CS2), and sodium hydroxide (NaOH). The effects of different important parameters, such as pH value, initial Cr(VI) concentration, coexisting ions and turbidity etc., on the removal of chromium from aqueous solution by PEX were investigated in flocculation experiments. The experiments results demonstrated that PEX could efficiently remove Cr(VI) and total Cr (Cr(VI)+Cr(III)) in strongly acidic media. It was proved that the presence of coexisting ions (Na(+), Ca(2+), F(-), Cl(-), and SO4(2-)) in the solution had a little influence on the removal of chromium. Furthermore, it was conformed that Cr(VI) ions and turbidity could be simultaneously removed when water samples contained both Cr(VI) ions and turbidity. Finally, the mechanism of interaction between chromium and PEX was further confirmed by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results reveal that dithiocarboxylic acid groups on PEX macromolecule play a major role in Cr(VI) reduction and Cr(III) chelation, and the flocs formation is attributed to the interparticle bridging mechanism of PEX.
authors: School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China. gangw99@163.com
authors: Gang
authors: G
authors: Wang
authors: Qing
authors: Q
authors: Chang
authors: Xiaoting
authors: X
authors: Han
authors: Mingyue
authors: M
authors: Zhang
mesh_terms: D002246:Carbon Disulfide / Q000737:chemistry*; D002614:Chelating Agents / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D005427:Flocculation; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D011094:Polyethyleneimine / Q000737:chemistry*; D012972:Sodium Hydroxide / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; D012972:Sodium Hydroxide; D011094:Polyethyleneimine; D002246:Carbon Disulfide