title: Adsorption of Cr(VI) using synthetic poly(m-phenylenediamine).
abstract: Poly(m-phenylenediamine) (PmPD) with different oxidation state was successfully synthesized by the improved chemically oxidative polymerization. The function of oxidation state on Cr(VI) adsorption was systematically examined through adsorption experiments. Results showed that the Cr(VI) adsorptivity of all PmPD increased with decreasing the initial pH. When the oxidation state of PmPD was dropped, the equilibrium time for Cr(VI) adsorption was obviously shortened and its Cr(VI) removal and adsorption selectivity were profoundly obviously increased. Typically, PmPD with the lowest oxidation state in this research possesses the highest Cr(VI) removal of 500 mg g(-1). Moreover, PmPD with lower oxidation state displays a potentially superior prospect in Cr(VI) treatment through preliminary experiments on 5 cycles of adsorption, column adsorption and practical wastewater treatment. The possible adsorption mechanism was discussed mainly according to characterizations (FTIR, XPS) and experiments, which together suggests that the Cr(VI) adsorption most possibly involve redox reaction, chelation and doping adsorption.
authors.affiliation: Department of Environmental Engineering, School of Metallurgical and Environment, Central South University, Changsha 410017, China.
authors.forename: Wanting
authors.initials: W
authors.lastname: Yu
authors.forename: Liyuan
authors.initials: L
authors.lastname: Zhang
authors.forename: Haiying
authors.initials: H
authors.lastname: Wang
authors.forename: Liyuan
authors.initials: L
authors.lastname: Chai
mesh_terms: D000327:Adsorption; D000814:Aniline Compounds / Q000737:chemistry; D002614:Chelating Agents / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry; D002857:Chromium / Q000737:chemistry*; D004577:Electron Probe Microanalysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010655:Phenylenediamines / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D011192:Potassium Dichromate / Q000737:chemistry; D011786:Quality Control; D012972:Sodium Hydroxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods
chemical_list: D000814:Aniline Compounds; D002614:Chelating Agents; D048271:Chitosan; D002857:Chromium; D010100:Oxygen; D010655:Phenylenediamines; D011108:Polymers; D011192:Potassium Dichromate; D012972:Sodium Hydroxide; D062065:Wastewater; D014874:Water Pollutants, Chemical; C416807:polyaniline; C074702:chromium hexavalent ion; C008381:3-phenylenediamine
keywords: Adsorption; Cr(VI); Oxidation state; Poly(m-phenylenediamine)