Adsorption of reactive dyes on calcined alunite from aqueous solutions
Adsorption of reactive dyes on calcined alunite from aqueous solutions
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DOI：
10.1016/s0304-3894(02)00358-8
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发表时间：
2003-03-17
影响因子：
13.6
通讯作者：
Sengil, IA
中科院分区：
文献类型：
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作者：
Özacar, M;Sengil, IA
d试图缓解纺织废水中活性染料的存在所引起的问题。由于明矾石是一种非常丰富和廉价的，我们决定用它作为一个潜在的吸附剂，用于纤维素纤维染色中使用的某种类型的超临界污染物的实验。研究了煅烧温度、煅烧时间、粒径、pH值、搅拌时间和染料浓度等因素对煅烧明矾石吸附活性蓝114（RB 114）、活性黄64（RY 64）和活性红124（RR 124）的影响。酸性pH有利于吸附RB 114，碱性pH有利于吸附RY 64和RR 124。平衡数据符合Langmuir等温式。RB 114、RY 64和RR 124的吸附容量分别为170.7、236和153 mg染料/g煅烧明矾石。采用准一级和二级动力学模型描述动力学数据，并计算了反应速率常数。实验数据用二级动力学模型拟合，表明化学吸附是传质过程中的限速步骤。(C)2003 Elsevier Science B.V保留所有权利。
dAn attempt to alleviate the problem caused by the presence of reactive dyes in textile effluents was undertaken. Since alunite is a very abundant and inexpensive, we decided to experiment with it as a potential adsorbent for a certain type of the supracited pollutants used in cellulose fibers dyeing. The adsorption of Reactive Blue 114 (RB 114), Reactive Yellow 64 (RY64) and Reactive Red 124 (RR124) by calcined alunite was studied by varying parameters such as the calcination temperature and time, particle size, pH, agitation time and dye concentration. Acidic pH was favorable for the adsorption of RB 114 and alkaline pH was favorable to both RY64 and RR124. The equilibrium data fit the Langmuir isotherm. The adsorption capacities were found to be 170.7, 236 and 153 mg dye per gram of calcined alunite for RB114, RY64 and RR124, respectively. The pseudo first- and second-order kinetic models were used to describe the kinetic data, and the rate constants were evaluated. The experimental data were fitted by the second-order kinetic model, which indicates that chemical sorption is the rate limiting step, inside of mass transfer. (C) 2003 Elsevier Science B.V All rights reserved.