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| 凹凸棒石/氧化锌纳米复合材料对亚甲基蓝的吸附性能 | |
| 引用本文： | 姚超,刘敏,李为民,陈志刚,张跃,李峰,陈天虎.凹凸棒石/氧化锌纳米复合材料对亚甲基蓝的吸附性能[J].环境科学学报,2010,30(6):1211-1219. |
| 作者姓名： | 姚超 刘敏 李为民 陈志刚 张跃 李峰 陈天虎 |
| 作者单位： | 1. 江苏工业学院化工系,常州,213164 2. 江苏省凹土工程技术研究中心,盱眙,211700 3. 合肥工业大学,合肥,230009 |
| 基金项目： | 国家高技术研究发展计划（863）项目 (No.2007AA06Z118)；江苏省支撑计划(No.BE2008032, BE2008033, BE2009099)；江苏省教育厅项目(No.08KJD430011, 09KJA430002);江苏省自然基金(No.BK2009748)；常州市科技攻关(No.CE2007075, CE2008077) |
| 摘 要： | 采用化学沉淀法在凹凸棒石的表面负载纳米氧化锌合成了凹凸棒石/氧化锌(ATP/ZnO)纳米复合材料.同时,研究了亚甲基蓝在纳米复合材料上的吸附行为,并从热力学和动力学角度探讨了吸附作用机理.吸附实验表明:纳米复合材料对亚甲基蓝有优异的吸附能力;纳米复合材料对亚甲基蓝的吸附热力学符合Langmuir等温吸附方程,最大吸附量可达110.50mg·g-1,吸附焓变为18.69kJ·mol-1,吸附自由能变为-33.06～-22.74kJ·mol-1,吸附熵变约为146J.mol-1.K-1,是一个自发的吸热过程;纳米复合材料对亚甲基蓝的吸附动力学符合准二级动力学方程,速率常数随着溶液初始浓度的提高而下降. |
| 关 键 词： | 凹凸棒石 氧化锌 纳米复合材料 亚甲基蓝 吸附 动力学和热力学 |
| 收稿时间： | 9/16/2009 4:49:24 PM |
| 修稿时间： | 2009/12/31 0:00:00 |
Adsorption capability of methylene blue by attapulgite/zinc oxide nanocomposites |
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| YAO Chao,LIU Min,LI Weimin,CHEN Zhigang,ZHANG Yue,LI Feng and CHEN Tianhu.Adsorption capability of methylene blue by attapulgite/zinc oxide nanocomposites[J].Acta Scientiae Circumstantiae,2010,30(6):1211-1219. | |
| Authors: | YAO Chao LIU Min LI Weimin CHEN Zhigang ZHANG Yue LI Feng and CHEN Tianhu |
| Institution: | Department of Chemical Engineering, Jiangsu Polytechnic University, Changzhou 213164,Department of Chemical Engineering, Jiangsu Polytechnic University, Changzhou 213164,Department of Chemical Engineering, Jiangsu Polytechnic University, Changzhou 213164,Department of Chemical Engineering, Jiangsu Polytechnic University, Changzhou 213164,Department of Chemical Engineering, Jiangsu Polytechnic University, Changzhou 213164,Jiangsu Engineering Technology Research Center of Attapulgite, Xuyi 211700 and Jiangsu Engineering Technology Research Center of Attapulgite, Xuyi 211700 |
| Abstract: | Nanocomposites of attapulgite supported with nano-ZnO were prepared by chemical coprecipitation. The adsorption capability, adsorption kinetics and thermodynamics of methylene blue on the nanocomposites were studied. The results indicated that the nanocomposites had excellent adsorption capability of methylene blue. The thermodynamics of methylene blue adsorption on the nanocomposites followed the Langmuir adsorption equation. The maximum adsorption amount was 110.50 mg·g-1, the adsorption enthalpy was 18.69 kJ·mol-1, the Gibbs free energy was -33.06 ~-22.74 kJ·mol-1, and the entropy was about 146 J·mol-1·K-1, so the adsorption process was both endothermic and spontaneous. The kinetics of methylene blue adsorption on nanocomposites fit the pseudo-second order rate law and the rate constant decreased as the initial concentration increased. |
| Keywords: | attapulgite zinc oxide nanocomposites methylene blue adsorption kinetics and thermodynamics |
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