Pb(II) and Cd(II) biosorption on Chondracanthus chamissoi (a red alga)

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• 作者：Andrea Yipmantin ; Holger J. Maldonado ; Martha Ly ; Jean Marie Taulemesse ; Eric Guibal
• 关键词：Chondracanthus chamissoi ; Lead ; Cadmium ; Sorption isotherms ; Uptake kinetics
• 刊名：Journal of Hazardous Materials
• 出版年：2011
• 出版时间：30 January 2011
• 年：2011
• 卷：185
• 期：2-3
• 页码：922-929
• 全文大小：480 K

文摘

Chondracanthus chamissoi is an efficient biosorbent for Pb(II) and Cd(II). The sorption efficiency increases with pH and reaches an optimum around pH 4. Maximum sorption capacity reaches 1.37 mmol Pb g⁻¹ and 0.76 mmol Cd g⁻¹. The biosorbent has a marked preference for Pb(II) over Cd(II), though insufficient for separating these metals by a simple sorption step. The uptake kinetics is controlled by the resistance to intraparticle diffusion with a limited impact of particle size, metal concentration and sorbent dosage. In the present case, grinding the biomass does not improve sorption capacity and uptake kinetics. The sorption of metal ions is probably due to their interaction with carrageenan (one of the main constituents of the biosorbent): sulfonic groups (on the sulfated polysaccharide) have a higher affinity for Pb(II) than for Cd(II) according to HSAB rules.