Ozer Ayla, Gürbüz Görkem, Calimli Ayla, Körbahti Bahadir K
Mersin University, Chemical Engineering Department, 33343 Ciftlikköy-Mersin, Turkey.
J Hazard Mater. 2008 Apr 1;152(2):778-88. doi: 10.1016/j.jhazmat.2007.07.088. Epub 2007 Jul 31.
In this study, the biosorption of nickel(II) ions on Enteromorpha prolifera, a green algae, was investigated in a batch system. The single and combined effects of operating parameters such as initial pH, temperature, initial metal ion concentration and biosorbent concentration on the biosorption of nickel(II) ions on E. prolifera were analyzed using response surface methodology (RSM). The optimum biosorption conditions were determined as initial pH 4.3, temperature 27 degrees C, biosorbent concentration 1.2 g/L and initial nickel(II) ion concentration 100 mg/L. At optimum biosorption conditions, the biosorption capacity of E. prolifera for nickel(II) ions was found to be 36.8 mg/g after 120 min biosorption. The Langmuir and Freundlich isotherm models were applied to the equilibrium data and defined very well both isotherm models. The monolayer coverage capacity of E. prolifera for nickel(II) ions was found as 65.7 mg/g. In order to examine the rate limiting step of nickel(II) biosorption, such as the mass transfer and chemical reaction kinetics, the intraparticle diffusion model, external diffusion model and the pseudo second order kinetic model were tested with the experimental data. It was found that for both contributes to the actual biosorption process. The pseudo second order kinetic model described the nickel(II) biosorption process with a good fitting.
在本研究中，采用间歇式系统研究了绿藻浒苔对镍（II）离子的生物吸附。使用响应面法（RSM）分析了初始pH、温度、初始金属离子浓度和生物吸附剂浓度等操作参数对浒苔吸附镍（II）离子的单一和联合影响。确定最佳生物吸附条件为初始pH 4.3、温度27℃、生物吸附剂浓度1.2 g/L和初始镍（II）离子浓度100 mg/L。在最佳生物吸附条件下，浒苔对镍（II）离子的生物吸附容量在吸附120分钟后为36.8 mg/g。将Langmuir和Freundlich等温线模型应用于平衡数据，两种等温线模型均拟合良好。浒苔对镍（II）离子的单层覆盖容量为65.7 mg/g。为了研究镍（II）生物吸附的速率限制步骤，如传质和化学反应动力学，用实验数据测试了颗粒内扩散模型、外扩散模型和伪二级动力学模型。结果发现，两者均对实际生物吸附过程有贡献。伪二级动力学模型对镍（II）生物吸附过程的拟合良好。
