| 凹凸棒粘土对水中亚甲蓝的吸附性能 |
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| 引用本文： | 王永生,周玉梅,王燕青,任雪峰,宋海.凹凸棒粘土对水中亚甲蓝的吸附性能[J].环境工程学报,2013,7(3):1010-1016. |
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| 作者姓名： | 王永生 周玉梅 王燕青 任雪峰 宋海 |
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| 作者单位： | 甘肃省高校河西走廊特色资源利用省级重点实验室,河西学院化学化工学院,张掖734000 |
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| 基金项目： | 甘肃省高等学校研究生导师科研项目(1109-01);甘肃省高校河西走廊特色资源利用省级重点实验室资助项目(XZ1010) |
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| 摘 要： | 用焦磷酸钠和盐酸纯化了地产凹凸棒粘土,SEM、XRD和FT-IR表征其结构。研究了凹凸棒粘土对亚甲蓝的吸附性能及热力学和动力学特征,考察了吸附时间、温度、初始浓度、pH和离子强度下对亚甲蓝吸附的影响。结果表明,不同实验条件下,吸附过程均符合准二级动力学特征。凹凸棒粘土对亚甲蓝是放热的物理吸附过程,吸附符合Langmuir模式,在303 K时最大吸附量为114.02 mg/g。与其他吸附材料相比,凹凸棒粘土对亚甲蓝有较快的吸附速率和较大的吸附量,可以作为价廉的吸附剂用于亚甲蓝的消除。
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| 关 键 词： | 凹凸棒粘土 亚甲蓝 吸附等温线 动力学 |
Adsorption of methylene blue from aqueous solution by attapulgite clay |
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| Wang Yongsheng,Zhou Yumei,Wang Yanqing,Ren Xuefeng and Song Hai.Adsorption of methylene blue from aqueous solution by attapulgite clay[J].Techniques and Equipment for Environmental Pollution Control,2013,7(3):1010-1016. |
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| Authors: | Wang Yongsheng Zhou Yumei Wang Yanqing Ren Xuefeng and Song Hai |
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| Institution: | Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, College of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China;Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, College of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China;Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, College of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China;Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, College of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China;Key Laboratory of Hexi Corridor Resources Utilization of Gansu Universities, College of Chemistry and Chemical Engineering, Hexi University, Zhangye 734000, China |
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| Abstract: | The purified attapulgite (ATP) was modified by hydrochloric acid and sodium pyrophosphate, which was characterized by scanning electron microscope (SEM), X-ray diffraction (XRD) and Fourier transform infrared (FT-IR) spectra. The adsorbent was successfully used to remove cationic dye methylene blue (MB) from an aqueous solution. Operating variables studied were pH, initial dye concentrations, temperatures, contact time and ionic strength. The adsorption process was found to exothermic for MB in nature. The experimental data were described by Langmuir and Freundlich isotherms, and found that the data fitted well to the Langmuir model with maximum monolayer uptake capacity of 114.02 mg/g at 303 K. The adsorption process followed the pseudo-second-order kinetic model. Compared with other adsorbents reported, the attapulgite clay has a faster adsorption rate and a higher adsorption capacity. Consequently, ATP may be employed as low-cost alternative adsorbent to remove MB from aqueous solutions. |
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| Keywords: | attapulgite clay methylene blue adsorption isotherm kinetics |
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