Evaluation of AC/ZnO composite for sorption of dichloromethane, trichloromethane and carbon tetrachloride: kinetics and isotherms
Evaluation of AC/ZnO composite for sorption of dichloromethane, trichloromethane and carbon tetrachloride: kinetics and isotherms
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DOI：
10.1016/j.jtice.2015.04.004
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发表时间：
2015-10-01
影响因子：
5.7
通讯作者：
Abdelbassit, Mohammed S. A.
中科院分区：
文献类型：
--
作者：
Saleh, Tawfik A.;Alhooshani, Khalid R.;Abdelbassit, Mohammed S. A.
本工作报告的效率活性炭负载氧化锌纳米粒子（AC/ZnO）去除二氯甲烷，三氯甲烷和四氯化碳的水溶液。以废轮胎为原料，采用热化学法制备活性炭。采用Zn（NO3）（2）中心点6 H（2）O将纳米氧化锌负载到活性炭中。采用BET比表面积分析仪、扫描电子能谱仪、X射线能谱仪、红外光谱仪和X射线衍射仪对AC/ZnO复合材料进行了表征。在不同的吸附剂用量、初始浓度和接触时间下进行批实验。吸附迅速，对二氯甲烷、氯仿和四氯化碳的吸附容量分别为6.67 mg/g、11.91 mg/g和16.10 mg/g。在20分钟的接触时间内达到平衡。这些污染物在AC/ZnO上的吸附符合准二级动力学模型，亲水组分的吸附符合粒内扩散模型。采用Freundlich和Langmuir吸附等温线模型对该过程进行了评价，结果表明，Langmuir吸附等温线模型拟合效果较好。该复合材料经多次再生后，吸附容量没有明显下降，证明了该复合材料的可重复使用性。(C)2015台湾化学工程师学会。Elsevier B. V.出版，保留所有权利。
The present work reports on the efficiency of activated carbon loaded with zinc oxide nanoparticles (AC/ZnO) for removing dichloromethane, trichloromethane and carbon tetrachloride from aqueous solutions. Waste tires were used as a raw material for the production of activated carbon (AC) by thermo-chemical process. Zinc oxide nanoparticles were loaded into AC by using Zn(NO3)(2)center dot 6H(2)O. The AC/ZnO composite has been characterized by BET analyzer, scanning electron spectroscope, energy dispersive X-ray spectroscope, FTIR spectrophotometer, and X-ray diffraction. Batch experiments were conducted under various adsorbent dosages, initial concentrations and contact time. Rapid adsorption was observed with adsorption capacity of 6.67 mg/g for dichloromethane, 11.91 mg/g for chloroform and 16.10 mg/g for carbon tetrachloride. The equilibrium was obtained in 20 min of contact time. The adsorption of these pollutants onto AC/ZnO was described well by the pseudo second-order model, and the hydrophilic fraction adsorption fitted the intraparticle diffusion model. Freundlich and Langmuir models were used to evaluate the process, and the Langmuir adsorption isotherm model fitted the data better than other models. The reusability of the composite was proved when no significant decrease in its adsorption capacity was observed even after several times of regeneration. (C) 2015 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.