Department of Chemistry, Maulana Azad National Institute of Technology, Bhopal 462 051, India.
J Colloid Interface Sci. 2010 Mar 15;343(2):463-73. doi: 10.1016/j.jcis.2009.11.060. Epub 2009 Dec 2.
The adsorption performance of the materials bottom ash (BA), a power plant waste, and de-oiled soya (DOS), a soya bean industry waste for removal of crystal violet dye, has been investigated through batch and column experiments. Batch studies have been performed to describe the impact of parameters such as pH, amount of adsorbent, dye concentration, temperature, and contact time on the removal of the dye. Experimental data have been modeled by using Langmuir, Freundlich, Tempkin, and Dubinin-Radushkevich (D-R) isotherms. Thermodynamic parameters (DeltaG(o), DeltaH(o), and DeltaS(o)) were evaluated for the dye-adsorbent systems, which revealed that the adsorption process is endothermic in nature. Pseudo-first- and second-order kinetic models have been applied to the experimental data and pseudo-second-order kinetics was found to describe the adsorption of the dye (crystal violet) on the adsorbents. In order to achieve bulk removal of the dye, column operations were made. Recovery of the dye was made by eluting HCl solution through the exhausted columns and almost 95% and 78% of the dye was recovered from BA and DOS columns, respectively.
通过批量和柱实验研究了材料底灰（BA）和脱油大豆（DOS）这两种废物对去除结晶紫染料的吸附性能。批量实验研究了 pH 值、吸附剂用量、染料浓度、温度和接触时间等参数对染料去除的影响。实验数据采用 Langmuir、Freundlich、Tempkin 和 Dubinin-Radushkevich（D-R）等温线进行了拟合。对染料-吸附剂体系进行了热力学参数（ΔG(o)、ΔH(o)和ΔS(o)）的评估，结果表明吸附过程本质上是吸热的。应用伪一级和二级动力学模型对实验数据进行了拟合，发现准二级动力学能够描述染料（结晶紫）在吸附剂上的吸附。为了实现染料的批量去除，进行了柱实验。通过耗尽的柱子洗脱 HCl 溶液来回收染料，从 BA 和 DOS 柱子中分别回收了约 95%和 78%的染料。
