Cadmium sorption by EPSs produced by anaerobic sludge under sulfate-reducing conditions.
This study showed that EPS produced by anaerobic sludge under sulfate-reducing bacteria was effective in removing Cd(2+) from solution. The sorption data could be described by the Freundlich isotherm model. The q(m) derived from the Langmuir isotherm model was up to 2720 mg/g EPSs. The presence of copper and nickel ions had significantly reduced the cadmium sorption by EPS and the presence of zinc had little effect. Analysis of FTIR spectra demonstrated that C-O-C of polysaccharides at 1150-1030 cm(-1), group of the amide(I), CH(2) group of the lipids, carboxyl and -OH groups of proteins and polysaccharides were involved in cadmium binding, of which the -OH groups and the C-O-C group of polysaccharides played a major role in cadmium sorption by EPSs.
Zhang
Daoyong
D
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, PR China.
Wang
Jianlong
J
Pan
Xiangliang
X
D000327:Adsorption; D000693:Anaerobiosis; D001704:Biopolymers / Q000032:analysis / Q000378:metabolism*; D002104:Cadmium / Q000302:isolation & purification* / Q000378:metabolism*; D010084:Oxidation-Reduction; D012722:Sewage / Q000737:chemistry / Q000382:microbiology*; D017550:Spectroscopy, Fourier Transform Infrared; D013431:Sulfates / Q000378:metabolism*
D001704:Biopolymers; D012722:Sewage; D013431:Sulfates; D002104:Cadmium