Ecole des Mines d'Alès, Laboratoire Génie de l'Environnement Industriel, 6 avenue de Clavières, F-30319 Ales cedex, France.
J Hazard Mater. 2011 Jan 30;185(2-3):922-9. doi: 10.1016/j.jhazmat.2010.09.108. Epub 2010 Oct 7.
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 P bg(-1) and 0.76 mmol C dg(-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.
角叉菜聚糖是一种有效吸附剂，可用于吸附 Pb(II) 和 Cd(II)。吸附效率随 pH 值升高而增加，在 pH 值约为 4 时达到最佳。最大吸附容量分别达到 1.37mmolPb/g 和 0.76mmolCd/g。尽管该吸附剂对 Pb(II)的吸附偏好程度显著高于 Cd(II)，但不足以通过简单的吸附步骤来分离这两种金属。吸附动力学受到颗粒内扩散阻力的控制，颗粒粒径、金属浓度和吸附剂用量的影响有限。在本案例中，研磨生物质并不能提高吸附容量和吸附动力学。金属离子的吸附可能是由于它们与角叉菜聚糖（吸附剂的主要成分之一）的相互作用：根据 HSAB 规则，磺基基团（在硫酸化多糖上）对 Pb(II)的亲和力高于 Cd(II)。
