碳质材料催化臭氧氧化去除水中溶解性有机物的研究进展

doi:10.16085/j.issn.1000-6613.2015.06.041

摘要/Abstract

摘要： 碳质材料催化臭氧氧化(CMs/O₃)体系具有除污性能强、臭氧利用率高和无金属溶出的特点, 但受制于CMs催化性能的易失性, 该方法目前仍处于实验室研发阶段。本文系统阐述了CMs/O₃体系的反应原理, 并认为表面催化氧化与均相羟自由基(HO·)反应是去除水中溶解性有机物的主要途径;详细分析了影响非均相反应机理与体系处理效能的关键因素, 并指出在反应过程中, 碳表面碱性活性点位的消耗与酸性含氧基团的累积可导致其催化性能的降低, 而选择以中孔结构为主的碳质材料, 优化溶液pH值和臭氧相对投加量等操作参数, 将有利于降低CMs内部的传质阻力, 显著提高对目标污染物的去除率。基于新近发表的文献, 本文综述了CMs/O₃对多种有机污染物和实际废水的处理效能, 并认为多壁碳纳米管(MWCNT)的引入与新型固着、负载技术的使用, 有望提升CMs/O₃在微污染水体深度净化领域的实用化水平。同时, 努力将CMs/O₃与现有技术相耦合, 建立经济、高效的组合工艺也是当前应用研究的重要方向。

关键词: 碳质材料, 臭氧氧化, 催化作用, 有机化合物, 表面, 羟自由基

Abstract: Catalytic ozonation based on carbon materials labeled as CMs/O₃ was well characterized by superior organics removal, high ozone utilization and without metal leaching; however, most of them were still at the stage of laboratory research, since a stable catalytic property of CMs could not be expected after a long running. In this paper, the main reaction mechanisms in CMs/O₃ system for removing dissolved organics from water, both surface catalytic oxidation and hydroxyl radicals(HO·)oxidation in bulk solution were discussed and the influences of critical factors in heterogeneous reaction pathways and organics removal efficiency were elaborated. It was pointed out that the consumption of basic active sites and the accumulation of acid oxygen-containing groups on the surface were considered to cause a partial deactivation of CMs in cyclic experiments. In addition, using mesoporous catalyst, optimizing pH and normalized ozone dosage, could help in reducing internal mass transfer resistances, thus enhance target organics removal. This paper reviewed the recent advances of CMs/O₃ applied in model organic pollutants removal and industrial wastewater treatment. Multi-walled carbon nanotube(MWCNT)and the innovative loading technology could improve CMs/O₃ performances in deep purification of micro-polluted water body. Coupling mature treatment methods and CMs/O₃ in an efficient and low-cost process was proposed as the important direction of further study.

Key words: carbon materials, ozonation, catalysis, organic compounds, surface, hydroxyl radicals

中图分类号:

X703

钱飞跃, 王翻翻, 刘小朋, 李月寒, 王建芳. 碳质材料催化臭氧氧化去除水中溶解性有机物的研究进展[J]. 化工进展, 2015, 34(06): 1755-1761.

QIAN Feiyue, WANG Fanfan, LIU Xiaopeng, LI Yuehan, WANG Jianfang. Catalytic ozonation based on carbon materials for removing dissolved organic compounds from water:A review[J]. Chemical Industry and Engineering Progree, 2015, 34(06): 1755-1761.

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