Alpat Sibel Kilinç, Ozbayrak Ozge, Alpat Senol, Akçay Hüsamettin
Department of Chemistry Education, Dokuz Eylul University, Buca-Izmir, Turkey.
J Hazard Mater. 2008 Feb 28;151(1):213-20. doi: 10.1016/j.jhazmat.2007.05.071. Epub 2007 May 31.
Clinoptilolite, a natural zeolite, was investigated as an inexpensive and effective adsorbent for the adsorption of Toluidine Blue O (TBO) from its aqueous solution. The effect of parameters such as the initial concentration of TBO, the solution of pH, contact time, temperature and particle size on the TBO adsorption was examined. The adsorption rate data were analysed according to the first and second-order kinetic models. Kinetic studies show that adsorption of TBO on clinoptilolite was fitted to the second-order adsorption model with two-step diffusion process. The activation energies for TBO adsorption on clinoptilolite for the first and second diffusion processes were 8.72 kJ mol(-1) and 19.02 kJ mol(-1), respectively. The adsorption isotherm was well fitted to both the Langmuir and Freundlich models. The maximum adsorption capacity of clinoptilolite for TBO was 2.1x10(-4) mol g(-1) at solution pH of 11.0.
斜发沸石，一种天然沸石，被研究作为一种廉价且有效的吸附剂，用于从其水溶液中吸附甲苯胺蓝O（TBO）。研究了TBO初始浓度、溶液pH值、接触时间、温度和粒径等参数对TBO吸附的影响。根据一级和二级动力学模型对吸附速率数据进行了分析。动力学研究表明，TBO在斜发沸石上的吸附符合具有两步扩散过程的二级吸附模型。TBO在斜发沸石上进行第一和第二扩散过程的吸附活化能分别为8.72 kJ mol(-1) 和19.02 kJ mol(-1)。吸附等温线与Langmuir模型和Freundlich模型均拟合良好。在溶液pH值为11.0时，斜发沸石对TBO的最大吸附容量为2.1x10(-4) mol g(-1)。
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