Kumar K Vasanth, Porkodi K
Department of Chemical Engineering, AC College of Technology, Anna University, Chennai 600025, TN, India.
J Hazard Mater. 2007 Jul 19;146(1-2):214-26. doi: 10.1016/j.jhazmat.2006.12.010. Epub 2006 Dec 10.
Batch experiments were carried out for the sorption of methylene blue onto Paspalum notatum. The operating variables studied were initial dye concentration, initial solution pH, adsorbent dosage and contact time. Experimental equilibrium data were fitted to Freundlich, Langmuir and Redlich-Peterson isotherms by non-linear regression method. Six error functions was used to determine the optimum isotherm by non-linear regression method. The present study shows r2 as the best error function to determine the parameters involved in both two- and three-parameter isotherms. Langmuir isotherm was found to be the optimum isotherm for methylene blue onto P. notatum. The monolayer methylene blue sorption capacity of P. notatum was found to be 31 mg/g. The kinetics of methylene blue onto P. notatum was found to follow a pseudo second order kinetics. A Boyd plot confirms the external mass transfer as the rate-limiting step in the dye sorption process. The influence of initial dye concentration on the dye sorption process was represented in the form of dimensionless mass transfer numbers (Sh/Sc0.33) and was found to vary as C(0)-5x10(-6).
进行了关于雀稗对亚甲基蓝吸附的批次实验。所研究的操作变量有初始染料浓度、初始溶液pH值、吸附剂用量和接触时间。通过非线性回归方法将实验平衡数据拟合到Freundlich、Langmuir和Redlich-Peterson等温线。使用六个误差函数通过非线性回归方法确定最佳等温线。本研究表明，r2是确定两参数和三参数等温线中相关参数的最佳误差函数。发现Langmuir等温线是亚甲基蓝在雀稗上的最佳等温线。雀稗对亚甲基蓝的单层吸附容量为31 mg/g。发现亚甲基蓝在雀稗上的吸附动力学遵循准二级动力学。Boyd图证实了外部传质是染料吸附过程中的限速步骤。初始染料浓度对染料吸附过程的影响以无量纲传质数（Sh/Sc0.33）的形式表示，发现其随C(0)-5x10(-6)变化。
