ABSTRACT

UiO-66 (Zr-MOF) metal-organic framework was successfully synthesized by the solvothermal method and characterized using FTIR, PXRD and TGA. Its ability to remove Malathion, 2,4-Dichlorophenoxyacetic acid (2,4-D) and a mixture of the two from an aqueous solution was studied. Effects of different experimental parameters (pH, adsorbent dose, contact time, speed of agitation and initial pesticide concentrations) were studied. Adsorption isotherm study revealed that the equilibrium data well fitted the Freundlich, Langmuir and Jovanovic isotherm models. Similarly, the kinetics study showed that the pseudo-first-order model gave the best fitting. Thermodynamic study indicated that the adsorption process was spontaneous and exothermic. To evaluate the matrix effect, tap water samples were spiked with standard solutions of the analytes and recoveries in the range of 70–120% were obtained. Based on the findings of the present study, UiO-66 (Zr-MOF) could be taken as a promising adsorbent for the removal of pesticides from aqueous samples

摘要

采用溶剂热法成功合成了UiO-66（Zr-MOF）金属有机骨架材料，并利用FTIR、PXRD和TGA进行了表征。研究了其从水溶液中去除马拉硫磷、2,4-二氯苯氧基乙酸 (2,4-D) 以及两者混合物的能力。研究了不同实验参数（pH、吸附剂剂量、接触时间、搅拌速度和初始农药浓度）的影响。吸附等温线研究表明平衡数据很好地符合Freundlich、Langmuir 和Jovanovic 等温线模型。同样，动力学研究表明伪一阶模型给出了最佳拟合。热力学研究表明吸附过程是自发的、放热的。为了评估基质效应，自来水样品中加入分析物的标准溶液，回收率在 70-120% 范围内。根据本研究的结果，UiO-66（Zr-MOF）可作为一种有前途的吸附剂，用于去除水样中的农药