Studies on biosorption equilibrium and kinetics of Cd2+ by Streptomyces sp. K33 and HL-12.
Studies on biosorption equilibrium and kinetics of Cd2+ by Streptomyces sp. K33 and HL-12.
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DOI：
10.1016/j.jhazmat.2008.08.014
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发表时间：
2009-05
影响因子：
13.6
通讯作者：
Hai-ping Yuan;Jun-hui Zhang;Zhenmei Lu;H. Min;Chu Wu
中科院分区：
文献类型：
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作者：
Hai-ping Yuan;Jun-hui Zhang;Zhenmei Lu;H. Min;Chu Wu
研究了链霉菌K33和HL-12对Cd ~（2+）的吸附。去除率随pH值的升高而增大，但随温度的升高没有明显差异。用傅里叶变换红外光谱（FT-IR）研究了镉离子与K33和HL-12的相互作用。结果表明，氨基、羧基、羟基和羰基的存在是导致生物吸附Cd 2+的原因。菌株HL-12的功能基团变化比K33大。菌株K33比HL-12更早建立生物吸附平衡，且K33的吸附率更高。采用Langmuir、Freundlich和Dubininin-Radushkevich（D-R）等温线描述吸附实验，其中Langmuir模型拟合效果最好。菌株K33对Cd ~（2+）的吸附能力较强，为38.49mg/g干细胞。采用拟一级动力学模型和拟二级动力学模型对反应动力学数据进行描述，其中拟二级动力学模型拟合较好。在pH ≤ 3的条件下，HL-12和K33菌株对Cd ~（2+）的回收率可达70%左右。
The sorption of Cd2+by Streptomyces sp. K33 and HL-12 was investigated. The removal efficiency increased with pH, but no obvious differences with different temperatures. Fourier transform infrared (FT-IR) was used to characterize the interaction between Cd2+and K33 and HL-12. Results revealed that the presence of amino, carboxyl, hydroxyl and carbonyl groups were responsible for the biosorption of Cd2+. Strain HL-12 had more changes in the functional groups than K33. Biosorption equilibrium was established earlier by strain K33 than that by HL-12, and K33 had higher adsorption ratio. Langmuir, Freundlich and Dubinin–Radushkevich (D–R) isotherms were used to describe the adsorption experiment, Langmuir model fitted the experiment data best. Strain K33 showed greater sorption capacities with 38.49mg Cd2+/g dry cells. Pseudo-first-order and second-order kinetic models were used to describe the kinetic data, and second-order kinetic model fitted better. About 70% recovery of Cd2+could be obtained at pH ≤ 3 from metal-loaded biomass of strains HL-12 and K33.