Zeolitic Imidazolate Framework-8 for Fast Adsorption and Removal of Benzotriazoles from Aqueous Solution

被引:247
作者
Jiang, Jun-Qing [1 ,2 ]
Yang, Cheng-Xiong [1 ,2 ]
Yan, Xiu-Ping [1 ,2 ]
机构
[1] Nankai Univ, State Key Lab Med Chem Biol, Synerget Innovat Ctr Chem Sci & Engn Tianjin, Tianjin 300071, Peoples R China
[2] Nankai Univ, Res Ctr Analyt Sci, Coll Chem, Tianjin 300071, Peoples R China
基金
中国国家自然科学基金;
关键词
metal-organic frameworks; ZIF-8; adsorption; benzotriazoles; water treatment; METAL-ORGANIC FRAMEWORKS; MUNICIPAL WASTE-WATER; CORROSION-INHIBITORS; LIQUID; TOLYLTRIAZOLE; CONTAMINANTS; TEMPERATURE; SORPTION; OZONE;
D O I
10.1021/am403079n
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
1H-benzotriazole (BTri) and 5-tolyltriazole (5-TTri) are emerging pollutants; the development of novel materials for their efficient adsorption and removal is thus of great significance in environmental sciences. Here, we report the application of zeolitic imidazolate framework-8 (ZIF-8) as a novel adsorbent for fast removal of BTri and 5-TTri in aqueous solution in view of adsorption isotherms, kinetics and thermodynamics, desorption, and adsorbent regeneration. The adsorption of BTri and 5-TTri on ZIF-8 was very fast, and most of BTri and 5-TTri were adsorbed in the first 2 min. The adsorption for BTri and 5-TTri follows a pseudo-second-order kinetics and fits the Langmuir adsorption model with the adsorption capacity of 298.5 and 396.8 mg g(-1) for BTri and 5-TTri at 30 degrees C, respectively. The adsorption was a spontaneous and endothermic process controlled by positive entropy change. No remarkable effects of pH, ionic strength, and dissolved organic matter on the adsorption of BTri and 5-TTri on ZIF-8 were observed. The used ZIF-8 could be regenerated effectively and recycled at least three times without significant loss of adsorption capacity. In addition, ZIF-8 provided much larger adsorption capacity and faster adsorption kinetics than activated carbon and ZIF-7. The hydrophobic and pi-pi interaction between the aromatic rings of the BTri and 5-TTri and the aromatic imizole rings of the ZIF-8, and the coordination of the nitrogen atoms in BTri and 5-TTri molecules to the Zn2+ ions in the ZIF-8 framework was responsible for the efficient adsorption. The fast adsorption kinetics, large adsorption capacity, excellent reusability as well as the pH, ionic strength, and dissolved organic matter insensitive adsorption create potential for ZIF-8 to be effective at removing benzotriazoles from aqueous solution.
引用
收藏
页码:9837 / 9842
页数:6
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