膜科学与技术

MnO2@ZIF-8/PES复合催化膜的制备及甲醛催化氧化研究

作者：王宇阳，肖泽仪，樊森清，买增辉，秦杨梅

单位：四川大学化学工程学院化工过程机械，四川省成都市 610065

关键词： MnO2@ZIF-8/PES；深层渗透；催化膜；甲醛催化

出版年,卷(期):页码： 2020,40(3):65-71

摘要：

通过深层渗透法在聚醚砜（PES）微孔膜的孔中原位合成组装了ZIF-8纳米组，进一步将MnO2与纳米ZIF-8进行复合，构筑了MnO2@ZIF-8/PES复合催化膜。采用连续渗流过膜的方式，对甲醛水溶液的膜催化氧化降解效果进行了研究。实验结果表明，对浓度为0.2 mM的甲醛溶液，在温度为25 oC，渗流流量为0.25 ml/h（对应水力停留时间30 min）的条件下，甲醛的催化降解效率达到72%。温度升高到85 oC，降解率可达99%。经过对比，MnO2@ZIF-8/PES复合催化膜的连续渗流催化效果远优于MnO2@ZIF-8粉体分散在溶液中的悬浮催化效果。对表观反应速率常数K进行了拟合，25℃时其值为0.0194 1/min，计算得到反应活化能Ea为19.72 kJ/mol。多次循环实验证明，MnO2@ZIF-8/PES复合催化膜表现了良好的催化耐久性。

Composite MnO2@ZIF-8/PES catalytic membranes were prepared by deep permeation synthesis fabrication method. First, ZIF-8 nanoclusters were in-situ synthesized inside PES membrane pores, and then MnO2 nanoparticles were continued to be assembled both inside and on the surface of ZIF-8. The catalysis oxidation of formaldehyde solution was carried out by continuous flowing method through membranes to explore their catalytic performance. The experiment results show that, with aqueous HCHO solution at initial concentration of 0.2mM and temperature of 25 oC and with flowrate of 0.25 ml/h (corresponding a hydraulic retention time of 30 min), HCHO degradation efficiency could be achieved by 72%. Moreover, at higher temperature of 85 oC, the HCHO degradation efficiency could be achieved as high as 99%. Compared with MnO2@ZIF-8 powder catalysts, composite MnO2@ZIF-8/PES catalytic membrane has presented higher catalytic activity and better stability. Besides, the constant of reaction rate and the apparent activation energy could be fitted perfectly as 0.0194 1/min (25 oC) and 19.72 kJ/mol respectively. After undergoing several catalytic reaction tests, the composite MnO2@ZIF-8/PES catalytic membranes still illustrated nice catalytic duration performance.

作者简介：王宇阳（1995— ），女，四川成都人，硕士研究生，研究方向为膜反应器及膜催化. < wangyy_1995@163.com> *通讯联系人

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