Department of Chemistry, Maulana Azad National Institute of Technology, Bhopal 462 051, India.
J Colloid Interface Sci. 2010 Feb 15;342(2):518-27. doi: 10.1016/j.jcis.2009.10.046. Epub 2009 Oct 24.
An agricultural industry waste, deoiled soya, and a waste of thermal power plants, bottom ash, have been tested for their adsorption ability to remove Light Green SF (Yellowish) dye from wastewaters. The effects of various essential experimental parameters (dye concentration, mesh size, temperature, and pH) have been investigated. A study of four isothermal models, Langmuir, Freundlich, Tempkin, and Dubinin-Radushkevich, has been made and important thermodynamic parameters have been calculated. The decreasing values of enthalpy show that the adsorption process is endothermic. Mechanistic studies reveal the involvement of a pseudo-second-order mechanism to drive the adsorption process in dye-bottom ash and dye-deoiled soya systems. It has been observed that a particle diffusion mechanism was prominent in the case of adsorption of the dye on bottom ash and deoiled soya. Column adsorption and desorption experiments further confirmed the practical application of the present research. The percentage adsorption has been obtained as 88.74% and 89.65% with percentage recovery of 99.82% and 99.08% for bottom ash and deoiled soya, respectively. The experimental results confirmed that triarylmethane dye Light Green SF (Yellowish) can be successfully removed and recovered from aqueous solutions economically and efficiently.
已测试了一种农业工业废物——脱油大豆和一种热能发电厂废物——底灰，以研究它们对从废水中去除亮绿 SF（黄色）染料的吸附能力。研究了各种基本实验参数（染料浓度、筛目尺寸、温度和 pH 值）的影响。研究了四种等温模型，朗缪尔、弗伦德利希、Tempkin 和 Dubinin-Radushkevich，并计算了重要的热力学参数。焓的降低值表明吸附过程是吸热的。机理研究表明，在染料-底灰和染料-脱油大豆系统中，吸附过程涉及到拟二级动力学机制。观察到在染料吸附到底灰和脱油大豆上时，颗粒扩散机制很明显。柱吸附和解吸实验进一步证实了本研究的实际应用。底灰和脱油大豆的吸附率分别为 88.74%和 89.65%，回收率分别为 99.82%和 99.08%。实验结果证实，三芳甲烷染料亮绿 SF（黄色）可以从水溶液中经济有效地被去除和回收。
