天然水体主要本底成分对催化臭氧氧化草酸的影响

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英文篇名：Effect of Background Constituents on Catalytic Ozonation of Oxalic Acid 作者：李旭凯 ; 郭杏妹 ; 张秋云 ; 李来胜 英文作者：LI Xukai;GUO Xingmei;ZHANG Qiuyun;LI Laisheng;School of Chemistry & Environment,South China Normal University; 关键词：催化臭氧氧化 ; Fe2O3 ; 活性炭 ; 草酸 ; 本底成分 英文关键词：catalytic ozonation;;Fe2O3;;activated carbons;;oxalic acid;;background constituents 中文刊名：HNSF 英文刊名：Journal of South China Normal University(Natural Science Edition) 机构：华南师范大学化学与环境学院; 出版日期：2017-04-25 出版单位：华南师范大学学报(自然科学版) 年：2017 期：v.49 基金：国家科技重大专项项目(2012ZX07206003);; 华南师范大学青年教师科研培育基金项目(14KJ07) 语种：中文; 页：HNSF201702015 页数：5 CN：02 ISSN：44-1138/N 分类号：86-90

摘要

采用浸渍法制备了Fe_2O_3负载活性炭(Fe_2O_3/AC)催化剂,考察了Fe_2O_3/AC催化臭氧氧化草酸的活性以及天然水体主要本底成分对Fe_2O_3/AC催化臭氧氧化草酸的影响.结果表明,臭氧氧化草酸过程中Fe_2O_3/AC显示了良好的催化活性,草酸的去除主要基于催化贡献.HCO_3~-、CO_3~(2-)及腐殖酸对Fe_2O_3/AC催化臭氧氧化草酸均有抑制作用.加入HCO_3~-和CO_3~(2-)使催化臭氧氧化草酸体系pH升高,进而降低Fe_2O_3/AC催化臭氧氧化草酸的活性.此外,HCO_3~-和CO_3~(2-)也是羟基自由基抑制剂,HCO_3~-、CO_3~(2-)对草酸去除的抑制作用从侧面验证了Fe_2O_3/AC催化臭氧氧化草酸遵循羟基自由基机理.腐殖酸加入体系后,与草酸形成竞争吸附和竞争氧化,从而抑制草酸的降解.
        The aim of this research was to investigate catalytic activity of Fe_2O_3 loaded activated carbon catalyst(Fe_2O_3/AC) prepared by the dipping method,and the effect of background constituents on catalytic ozonation of oxalic acid.The results indicated that Fe_2O_3/AC showed good activity in ozonation of oxalic acid,and the removal of oxalic acid was mainly based on catalytic contribution.Some background constituents such as HCO_3~-,CO_3~(2-) and humic acid could cause the inhibition of oxalic acid degradation in Fe_2O_3/AC catalytic ozonation.The addition of HCO_3~-,CO_3~(2-) increased the pH value of system,and therefore the activity of Fe_2O_3/AC decreased.The inhibition of oxalic acid degradation indirectly proved that catalytic ozonation of oxalic acid in the presence of Fe_2O_3/AC followed the mechanism of hydroxyl radical oxidation.The humic acid competed with oxalic acid to be adsorbed and oxidized which led to the inhibition of oxalic acid degradation.

引文

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