title: Biosorption of copper(II) from aqueous solutions by green alga Cladophora fascicularis.
abstract: Biosorption is an effective means of removal of heavy metals from wastewater. In this work the biosorption behavior of Cladophora fascicularis was investigated as a function of pH, amount of biosorbent, initial Cu2+ concentration, temperature, and co-existing ions. Adsorption equilibria were well described by Langmuir isotherm models. The enthalpy change for the biosorption process was found to be 6.86 kJ mol(-1) by use of the Langmuir constant b. The biosorption process was found to be rapid in the first 30 min. The presence of co-existing cations such as Na+, K+, Mg2+, and Ca2+ and anions such as chloride, nitrate, sulfate, and acetate did not significantly affect uptake of Cu2+ whereas EDTA substantially affected adsorption of the metal. When experiments were performed with different desorbents the results indicated that EDTA was an efficient desorbent for the recovery of Cu2+ from biomass. IR spectral analysis suggested amido or hydroxy, C=O, and C-O could combine strongly with Cu2+.
authors.affiliation: Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, Peoples Republic of China.
authors.forename: Liping
authors.initials: L
authors.lastname: Deng
authors.forename: Xiaobin
authors.initials: X
authors.lastname: Zhu
authors.forename: Xinting
authors.initials: X
authors.lastname: Wang
authors.forename: Yingying
authors.initials: Y
authors.lastname: Su
authors.forename: Hua
authors.initials: H
authors.lastname: Su
mesh_terms: D000327:Adsorption; D000460:Chlorophyta / Q000378:metabolism*; D003300:Copper / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012996:Solutions; D013055:Spectrophotometry, Infrared; D013696:Temperature
chemical_list: D012996:Solutions; D003300:Copper