过氧二硫酸盐
气凝胶
煅烧
明胶
材料科学
催化作用
化学工程
化学
激进的
电子顺磁共振
降级(电信)
光催化
复合材料
有机化学
电信
计算机科学
工程类
物理
核磁共振
作者
Ying Jing,Meiying Jia,Zhiwei Xu,Weiping Xiong,Zhen Yang,Haihao Peng,Jian Cao,Yinping Xiang,Caijian Zhang
标识
DOI:10.1016/j.jhazmat.2021.127503
摘要
The application of traditional powder catalysts is limited by particle agglomeration and difficult recovery. In this work, a three-dimensional porous aerogel catalyst for organic pollutants degradation in water by activating peroxydisulfate (PDS) was successfully synthesized, which was obtained via directly mixing of MIL-88B(Fe) with sol precursors followed by vacuum freeze-drying and low-temperature calcination. MIL-88B(Fe)/gelatin aerogel-150/PDS (MGA-150/PDS) system displayed satisfactory norfloxacin (NOR) degradation performance, which could remove 98.7% of NOR in 90 min. Its reaction rate constant was 23.2 times higher than the gelatin aerogel/PDS (GA/PDS) system. In addition, Electron paramagnetic resonance (EPR) results and radical trapping experiments revealed both radicals (SO4•-, •OH) and non-radical (1O2) pathways had participated in NOR degradation, of which •OH was dominant. Possible degradation pathways were proposed. Moreover, the high degradation efficiency of NOR by MGA-150 composites could still be reached more than 90.0% even after 10 cycles, and the morphology and chemical structure of MGA-150 composites exhibited no significant changes, indicating the arrestive stability of aerogel composites. This progress not only proposed an effective catalyst for PDS activation, but also expanded views for the design and development of 3D functional materials.
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