Ofomaja Augustine E, Ho Yuh-Shan
Department of Industrial Chemistry, Faculty of Physical Sciences, University of Benin, Ugbowo-Lagos Road, P.M.B 1154, Benin City, Edo State, Nigeria.
Bioresour Technol. 2008 Sep;99(13):5411-7. doi: 10.1016/j.biortech.2007.11.018. Epub 2008 Feb 21.
In this study, the effect of temperature on the equilibrium biosorption of methyl violet dye from aqueous solution using Mansonia wood sawdust was studied. The equilibrium biosorption data were analyzed using three widely applied isotherm models; Langmuir, Freundlich and Redlich-Peterson isotherm. The fit of three linear Langmuir isotherm forms, the Freundlich isotherm, and the Redlich-Peterson isotherm were determined using linear and the non-linear methods. Langmuir isotherm parameters obtained from the three Langmuir linear equations by using linear method were dissimilar, except, when the non-linear method was used. Best fits were yielded with Langmuir and Redlich-Peterson isotherms. The methyl violet biosorption was strongly dependent solution pH and percentage dye removal became significant above pH 7, which was slightly higher than the pH(PZC) of the sawdust material. In addition, various thermodynamic parameters, such as DeltaG degrees , DeltaH degrees , and DeltaS degrees were calculated. Results suggested that the biosorption was a spontaneous and endothermic process.
在本研究中，研究了温度对使用曼索尼木屑从水溶液中平衡生物吸附甲基紫染料的影响。使用三种广泛应用的等温线模型（朗缪尔等温线、弗伦德利希等温线和雷德利希-彼得森等温线）分析平衡生物吸附数据。使用线性和非线性方法确定了三种线性朗缪尔等温线形式、弗伦德利希等温线和雷德利希-彼得森等温线的拟合情况。通过线性方法从三个朗缪尔线性方程获得的朗缪尔等温线参数不同，除非使用非线性方法。朗缪尔等温线和雷德利希-彼得森等温线给出了最佳拟合。甲基紫的生物吸附强烈依赖于溶液pH值，且在pH值高于7时染料去除率显著提高，该pH值略高于木屑材料的零电荷点（PZC）。此外，还计算了各种热力学参数，如ΔG°、ΔH°和ΔS°。结果表明，生物吸附是一个自发的吸热过程。
