Competitive adsorption of heavy metals by extracellular polymeric substances extracted from Klebsiella sp. J1.
The adsorption of Cu(2+) and Zn(2+) by extracellular polymeric substances (EPS) extracted from Klebsiella sp. J1 and competitive adsorption mechanism were investigated. Equilibrium adsorption capacities of Cu(2+) (1.77mMg(-1)) on Klebsiella sp. J1 EPS were higher than those of Zn(2+) (1.36mMg(-1)) in single systems. The competitive Langmuir and Langmuir-Freundlich isotherm models were proven to be effective in describing the experimental data of binary component system. The three dimensional sorption surfaces of binary component system demonstrated that the presence of Cu(2+) more significantly decreased the sorption of Zn(2+), but the sorption of Cu(2+) was not disturbed by the presence of Zn(2+). FTIR and EEM results revealed the adsorption sites of Cu(2+) entirely overlapped with those of Zn(2+). Cu(2+) and Zn(2+) showed competitive adsorption in binary systems, and Cu(2+) was preferentially adsorbed because of the stronger complexation ability of the protein-like substances in Klebsiella sp. J1 EPS.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
Jixian
J
Yang
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
Wei
W
Wei
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
Shanshan
S
Pi
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
Fang
F
Ma
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China. Electronic address: ang.li.harbin@gmail.com.
Ang
A
Li
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China.
Dan
D
Wu
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, People's Republic of China; School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, People's Republic of China; Heilongjiang Provincial Research Academy of Environmental Sciences, Harbin 150090, People's Republic of China.
Jie
J
Xing
D000327:Adsorption; D002457:Cell Extracts / Q000737:chemistry*; D003300:Copper / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D007709:Klebsiella / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism
D002457:Cell Extracts; D003300:Copper; D015032:Zinc
Competitive adsorption; Copper ion adsorption; Extracellular polymeric substance; Zinc-ion adsorption