An Extracellular Biopolymer Produced by Pseudomonas alcaligenes as Biosorbent to Remove Copper(II) from Aqueous Solutions
The objective of this study is to assess the potential applicability of an extracellular biopolymer (PA-2) produced by Pseudomonas alcaligenes as biosorbent remove the Cu(II) ions from environmental and industrial wastewater. The effects such as pH, Cu(II) initial concentration and sorbate-sorbent contact time and agitating speed on the adsorption capacities of PA-2 were studied. Biosorption equilibriums were rapidly established in about 60 min and the adsorption kinetics followed the pseudo-second order kinetic model. Biosorption equilibrium datas were better described by Langmuir isotherm model. The maximum Cu(II) adsorption capacity determined from Langmuir isotherm were 81.36 mg /g PA-2. The carboxyl and hydroxyl groups of the PA-2 were involved in chemical interaction with the Cu(II) ions depicted by Fourier transform infrared spectroscopic (FTIR) results. The present study indicated that PA-2 may be used as an inexpensive, effective and easily cultivable biosorbent for the removal of Cu(II) ions from environmental and industrial wastewater.
Zhihua Xu, Gang Shen and Sally Lin
L. X. Luo et al., "An Extracellular Biopolymer Produced by Pseudomonas alcaligenes as Biosorbent to Remove Copper(II) from Aqueous Solutions", Advanced Materials Research, Vols. 171-172, pp. 11-14, 2011