| UiO-66对废水中二氯苯氧乙酸的吸附特性 |
| 摘要点击 2601 全文点击 1422 投稿时间：2015-10-13 修订日期：2016-01-11 |
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| 中文关键词 2,4-D UiO-66 吸附性能 吸附动力学 吸附热力学 |
| 英文关键词 2,4-D UiO-66 adsorption performance adsorption kinetics adsorption thermodynamics |
| 作者 | 单位 | E-mail | | 任天昊 | 中国地质大学(北京)水资源与环境学院, 水资源与环境工程重点实验室, 北京 100083 | 13141230248@163.com | | 杨智临 | 中国地质大学(北京)水资源与环境学院, 水资源与环境工程重点实验室, 北京 100083 | | | 郭琳 | 中国地质大学(北京)水资源与环境学院, 水资源与环境工程重点实验室, 北京 100083 | | | 陈海 | 中国地质大学(北京)水资源与环境学院, 水资源与环境工程重点实验室, 北京 100083 | | | 杨琦 | 中国地质大学(北京)水资源与环境学院, 水资源与环境工程重点实验室, 北京 100083 | yq@cugb.edu.cn |
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| 中文摘要 |
| 以UiO-66型金属有机框架为吸附剂,研究了时间、pH值和温度对自制金属有机框架UiO-66吸附2,4-D性能的影响.结果表明,UiO-66的吸附平衡时间为24 h;初始溶液最佳pH值为4.0; UiO-66上的平衡吸附量随温度的升高而增加,实验最佳温度应控制在30℃. UiO-66对2,4-D的吸附符合Langmuir吸附模型;吸附动力学符合拟二级模型;颗粒内扩散过程是吸附速率控制步骤;热力学计算结果显示ΔG<0、ΔH>0、ΔS>0,由此判断吸附是自发、吸热、熵增加的化学过程.本实验表明,UiO-66在去除农业废水中2,4-D领域有实际应用的潜力. |
| 英文摘要 |
| With UiO-66 metal organic framework as the adsorbent, the influences of factors such as time, pH value, temperature on the adsorption were studied. The results showed that the adsorption effect was best at pH=4.0 for the adsorption system and the adsorption equilibrium time was 24 h. The equilibrium adsorption capacity increased with the increasing temperature and the optimal temperature should be controlled at 30℃. The adsorption of 2,4-D on UiO-66 followed Langmuir isotherm model and the adsorption kinetics could be better described by pseudo-second-order model. The intraparticle diffusion process was the rate-controlling step for adsorption processes. The results of thermodynamic calculations showed that ΔG<0, ΔH>0, ΔS>0. So the adsorption was a spontaneous, endothermic chemical process with increased randomness. The main interaction forces of adsorption were chemical bonding force and electrostatic interactions force. Results of the study suggested that UiO-66 had the potential ability for 2,4-D removal from wastewater. |
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