title: Synergetic effects and flocculation behavior of anionic polyacrylamide and extracellular polymeric substrates extracted from Klebsiella sp. J1 on improving soluble cadmium removal.
abstract: The performance and flocs properties in removing soluble cadmium of the dual flocculant APAM-MFX (anionic polyacrylamide APAM used in combination with extracellular polymeric substrates extracted from Klebsiella sp. J1 MFX) were studied compared with the performance of using bioflocculant alone. In addition, adsorption isotherms and kinetic process for Cd(II) adsorption onto APAM-MFX were investigated. APAM-MFX synergistically improved the Cd(II) removal percentage by 82.68%. Characteristic flocs formed by APAM-MFX indicated the synergetic effects resulted from additional bridging bonds between APAM and MFX. Adsorption process was best described by the Freundlich isotherm and pseudo-second order kinetic model. The mean free energy E (8.39-8.57kJmol(-1)) and activation energy Ea (45.09kJmol(-1)) were determined. Based on the results, the main mechanism of Cd(II) removal by APAM-MFX could be chemical ion exchange, and the liquid-film diffusion step was the rate-limiting step.
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wei
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China. Electronic address: ang.li.harbin@gmail.com.
authors.forename: Ang
authors.initials: A
authors.lastname: Li
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China. Electronic address: yangxj@hit.edu.cn.
authors.forename: Jixian
authors.initials: J
authors.lastname: Yang
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
authors.forename: Fang
authors.initials: F
authors.lastname: Ma
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
authors.forename: Dan
authors.initials: D
authors.lastname: Wu
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
authors.forename: Jie
authors.initials: J
authors.lastname: Xing
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
authors.forename: Xianjiao
authors.initials: X
authors.lastname: Zhou
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
authors.forename: Dan
authors.initials: D
authors.lastname: Zhao
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000327:Adsorption; D002104:Cadmium / Q000737:chemistry*; D005427:Flocculation; D007700:Kinetics; D007709:Klebsiella; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D000099166:Polyacrylamides
chemical_list: D000180:Acrylic Resins; D002104:Cadmium; D014874:Water Pollutants, Chemical; D000099166:Polyacrylamides
keywords: Adsorption and flocculation; Anionic polyacrylamide; Cadmium removal; Extracellular polymeric substrates; Synergetic effects