Amini Malihe, Younesi Habibollah, Bahramifar Nader
Department of Environmental Science, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, PO Box 64414-356, Iran.
Chemosphere. 2009 Jun;75(11):1483-91. doi: 10.1016/j.chemosphere.2009.02.025. Epub 2009 Mar 13.
In the present study, the effects of biosorbent Aspergillus niger dosage, initial solution pH and initial Ni(II) concentration on the uptake of Ni(II) by NaOH pretreated biomass of A. niger from aqueous solution were investigated. Batch experiments were carried out in order to model and optimize the biosorption process. The influence of three parameters on the uptake of Ni(II) was described using a response surface methodology (RSM) as well as Langmuir and Freundlich isotherm models. Optimum Ni(II) uptake of 4.82 mg Ni(II)g(-1) biomass (70.30%) was achieved at pH 6.25, biomass dosage of 2.98 gL(-1) and initial Ni(II) concentration of 30.00 mgL(-1) Ni(II). Langmuir and Freundlich were able to describe the biosorption isotherm fairly well. However, prediction of Ni(II) biosorption using Langmuir and Freundlich isotherms was relatively poor in comparison with RSM approaches. The biosorption mechanism was also investigated by using Fourier transfer infrared (FT-IR) analysis of untreated, NaOH pretreated, and Ni(II) loaded A. niger biomass.
在本研究中，考察了生物吸附剂黑曲霉用量、初始溶液pH值和初始Ni(II)浓度对经NaOH预处理的黑曲霉生物质从水溶液中摄取Ni(II)的影响。进行了批次实验以对生物吸附过程进行建模和优化。使用响应面法（RSM）以及朗缪尔和弗伦德利希等温线模型描述了这三个参数对Ni(II)摄取的影响。在pH 6.25、生物质用量为2.98 gL(-1)和初始Ni(II)浓度为30.00 mgL(-1) Ni(II)的条件下，实现了最佳Ni(II)摄取量为4.82 mg Ni(II)g(-1)生物质（70.30%）。朗缪尔和弗伦德利希能够较好地描述生物吸附等温线。然而，与RSM方法相比，使用朗缪尔和弗伦德利希等温线对Ni(II)生物吸附的预测相对较差。还通过对未处理、经NaOH预处理和负载Ni(II)的黑曲霉生物质进行傅里叶变换红外（FT-IR）分析来研究生物吸附机制。
