Biosorption of Ni(ii) and Pb(ii) by Phanerochaete chrysosporium from a binary metal system – kinetics
Biosorption of Ni(ii) and Pb(ii) by Phanerochaete chrysosporium from a binary metal system – kinetics
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DOI：
10.4314/wsa.v27i1.5004
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发表时间：
2004-04
期刊：
影响因子：
1.5
通讯作者：
I. H. Ceribasi;U. Yetis
中科院分区：
文献类型：
--
作者：
I. H. Ceribasi;U. Yetis
研究了降解木质素的白腐菌黄孢原毛革菌休眠细胞从二元金属体系中吸附Ni（II）和Pb（II）的动力学。动力学研究表明，生物吸附发生在两个阶段：一个快速的表面吸附，在第一个30分钟内，和一个缓慢的细胞内扩散，直到3小时的接触时间结束。在接触溶液的pH值急剧下降的第一分钟，平行于快速金属吸收，可能是因为质子释放的生物吸附剂。当达到吸附平衡时，溶液pH也达到平衡水平。金属的生物吸附能力增加的初始金属浓度（C i）的增加，独立于初始pH值（pH i），一般具有较高的C i的金属有较高的吸收能力。结果还表明，吸附的金属离子的一部分被P. chrysosporium很容易释放到溶液中的pH值的降低。在平衡时，P. chrysosporium的最大总金属吸收量为109.5 mg/g，并达到在pH值为5。在这种情况下，Ni（II）和Pb（II）的吸收容量分别为55.9 mg Ni/g和53.6 mg Pb/g。
The biosorption kinetics of Ni(II) and Pb(II) by the resting cells of a lignolytic white-rot fungus, Phanerochaete chrysosporium , from a binary metal system were investigated. Kinetic studies revealed that biosorption takes place in two stages: a rapid sur face adsorption, within the first 30 min, and a slow intracellular diffusion till the end of the 3 h contact time. In the first min utes of contact solution pH decreased sharply, parallel to the fast metal uptake, probably because of the protons released by the biosorbent. As sorption equilibrium was reached, solution pH also reached an equilibrium level. Metal biosorption capacities increased as the initial metal concentrations (C i ) increased, independent of initial pH (pH i ) and generally the metal with higher C i had a higher uptake capacity. The results also show that some portion of the metal ions sorbed by P. chrysosporium was readily released to solution with a decrease in pH. At equilibrium, the maximum total metal uptake of P. chrysosporium was 109.5 mg/g and was reached at pH i 5. Under these circumstances Ni(II) and Pb(II) uptake capacities were 55.9 mg Ni/g and 53.6 mg Pb/g, respectively.