Defected UiO-66 for adsorption of plasticizer in aqueous phase

doi:10.16085/j.issn.1000-6613.2017-0637

Abstract

Abstract: Metal-organic frameworks (MOFs) are a new type of porous materials with skeletal structure. In this study,two metal organic framework compounds (MOFs),namely,UiO-66 and defective UiO-66 (UiO-66-1) were synthesized and evaluated for their adsorption for plasticizer dimethyl phthalate(DMP) from aqueous solution. Results showed that UiO-66-1 had better DMP adsorption performance than that of UiO-66. For UiO-66-1,the adsorption kinetics results showed that 5-10min was sufficient to reach equilibrium. The adsorption rate remained stable at b pH between 3-10. The adsorption kinetics could be well described by using a quasi-second-order kinetics model. Analysis results showed that defective UiO-66-1 had much higher specific surface area and pore volume compared to UiO-66,reaching as high as 1438m²/g and 0.58cm³/g,respectively,thereby enabling a better adsorption performance for DMP. The maximum adsorption capacity of UiO-66-1,as fitted by using Langmuir model,could reach as high as 404mg/g,twice as much as that of UiO-66. Moreover,the MOFs could also be recycled for adsorption.

Key words: polymers, pollution, adsorption

摘要： 金属有机骨架材料（metal-organic frameworks，MOFs）是一种具有骨架结构的新型多孔材料。本研究合成了金属有机框架化合物UiO-66和有缺陷的UiO-66（UiO-66-1），并研究了其作为吸附剂吸附塑化剂邻苯二甲酸二甲酯（DMP）的性能及其吸附动力学，最后通过拟合吸附等温线和吸附动力学模型拟合了吸附剂的最大吸附量和最快吸附时间。实验结果表明，UiO-66-1对DMP有更好的吸附性能，在5~10min内快速达到吸附平衡，pH在3~10吸附率仍可保持稳定；分析测试结果表明，引入缺陷的UiO-66-1的比表面积比UiO-66大，达到了1438m²/g，孔容为0.58cm³/g，晶体的尺寸也明显增大，吸附量增大了近一倍，最大吸附量可达到404mg/g，且循环利用率高；通过吸附等温线模型和吸附动力学模型的拟合研究表明，UiO-66-1的吸附过程比较符合Langmuir模型和拟二级动力学模型。

关键词: 聚合物, 污染, 吸附(作用)

CLC Number:

O625
O627

BAI Yang, ZHANG Erpan, ZHAO Hongting. Defected UiO-66 for adsorption of plasticizer in aqueous phase[J]. Chemical Industry and Engineering Progress, 2018, 37(03): 1062-1069.

白杨, 张尔攀, 赵红挺. 缺陷UiO-66对水中塑化剂的吸附[J]. 化工进展, 2018, 37(03): 1062-1069.

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