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Mechanism of Alizarin Red S and Methylene Blue Biosorption onto Olive Stone: Isotherm study in Single and Binary Systems

机译:茜素红S和亚甲基蓝生物吸附在橄榄石上的机理:单和二元系统中的等温线研究

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摘要

The biosorption process of anionic dye Alizarin Red S (ARS) and cationic dye methylene blue (MB) as a function of contact time, initial concentration and solution pH onto olive stone (OS) biomass has been investigated. Equilibrium biosorption isotherms in single and binary systems and kinetics in batch mode were also examined. The kinetic data of the two dyes were better described by the pseudo second-order model. At low concentration, ARS dye appeared to follow a two-step diffusion process, while MB dye followed a three-step diffusion process. The biosorption experimental data for ARS and MB dyes were well suited to the Redlich-Peterson isotherm. The maximum biosorption of ARS dye, qmax = 16.10 mg/g, was obtained at pH 3.28 and the maximum biosorption of MB dye, qmax = 13.20 mg/g, was observed at basic pH values. In the binary system, it was indicated that the MB dye diffuses firstly inside the biosorbent particle and occupies the biosorption sites forming a monodentate complex and then the ARS dye enters and can only bind to untaken sites; forms a tridentate complex with OS active sites.
机译:研究了阴离子染料茜素红S(ARS)和阳离子染料亚甲基蓝(MB)作为接触时间,初始浓度和溶液pH在橄榄石(OS)生物质上的生物吸附过程。还研究了单系统和二元系统中的平衡生物吸附等温线以及间歇模式下的动力学。假二阶模型可以更好地描述两种染料的动力学数据。在低浓度下,ARS染料似乎遵循两步扩散过程,而MB染料遵循三步扩散过程。 ARS和MB染料的生物吸附实验数据非常适合Redlich-Peterson等温线。在pH值为3.28时,ARS染料的最大生物吸附量qmax = 16.10 mg / g,在碱性pH值下观察到MB染料的最大生物吸附量qmax = 13.20 mg / g。在二元体系中,表明MB染料首先在生物吸附剂颗粒内扩散并占据生物吸附位点,形成单齿复合物,然后ARS染料进入并只能与未吸收位点结合。与OS活动站点形成一个三齿复合体。

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