Pan Yong, Li Zhi, Zhang Zhe, Tong Xiong-Shi, Li Hai, Jia Chong-Zhi, Liu Bei, Sun Chang-Yu, Yang Lan-Ying, Chen Guang-Jin, Ma De-Yun
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, PR China.
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, PR China.
J Environ Manage. 2016 Mar 15;169:167-73. doi: 10.1016/j.jenvman.2015.12.030. Epub 2015 Dec 30.
ZIF-67(zinc-methylimidazolate framework-67), one of the zeolitic imidazolate frameworks (ZIFs), was used for the removal of phenol from aqueous solutions via adsorption and shows high adsorption capacity for phenol. The thermodynamic and kinetic adsorption behavior of ZIF-67 for phenol in water with concentration ranging from 50 to 300 ppm were investigated in a batch reactor and a ZIF-67 packed column, respectively. The effects of pH, contact time, zeta potential of the adsorbent and temperature on the adsorption behavior were evaluated, and the results demonstrated that the adsorption is primarily brought about by a specific favorable interaction (electrostatic interaction) between phenol and ZIF-67 surface. The suitability of the Langmuir adsorption model to the equilibrium data was investigated for each phenol-adsorbent system, which the results showed that the equilibrium data for all the phenol-sorbent systems fitted the Langmuir model. Thermodynamic parameters such as Gibbs free energy are calculated from the experimental data at different temperatures. The adsorbent could be perfectly regenerated at 120 °C with little loss in the adsorption ability.
ZIF-67（锌-甲基咪唑骨架-67）是沸石咪唑骨架材料（ZIFs）之一，用于通过吸附从水溶液中去除苯酚，对苯酚表现出高吸附容量。分别在间歇式反应器和ZIF-67填充柱中研究了ZIF-67对水中浓度范围为50至300 ppm苯酚的热力学和动力学吸附行为。评估了pH值、接触时间、吸附剂的zeta电位和温度对吸附行为的影响，结果表明吸附主要是由苯酚与ZIF-67表面之间特定的有利相互作用（静电相互作用）引起的。研究了每个苯酚-吸附剂体系中朗缪尔吸附模型对平衡数据的适用性，结果表明所有苯酚-吸附剂体系的平衡数据均符合朗缪尔模型。根据不同温度下的实验数据计算了吉布斯自由能等热力学参数。吸附剂在120°C时可完美再生，吸附能力几乎没有损失。
