微纳米气液分散体系氧化脱除天然气汽车尾气中的复合污染物  

Oxidation removal of multiple pollutants from natural gas vehicle exhaust in micro-nano gas-liquid dispersion system

作　　者：王凡 马梦蝶 王曦 杨明 李登新[1] WANG Fan;MA Mengdie;WANG Xi;YANG Ming;LI Dengxin(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;Analysis and Testing Center,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]东华大学分析测试中心,上海201620

出　　处：《化工环保》2021年第2期173-178,共6页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金钢铁联合基金项目(U1660107);上海市生态环境局项目(沪环科[2019]第10号);中央高校基本科研业务费专项资金项目(2232020A-10)。

摘　　要：采用微纳米气液分散体系对天然气汽车尾气中的复合污染物进行氧化脱除。实验结果表明:CH_(4)、NO和SO_(2)的脱除率均随着吸收液中NaCl、十二烷基硫酸钠(SDS)、Fe^(2+)和Mn^(2+)投加量的增加而先升后降,在酸性和碱性条件下均随着pH的增大呈先升后降的趋势;进气CH_(4)、NO、SO_(2)质量浓度为429,267,571 mg/m^(3)时,最佳脱除条件为吸收液pH 6、NaCl投加量0.5 g/L、SDS投加量4 mg/L、Mn^(2+)投加量2.0 mmol/L,在此条件下CH_(4)、NO和SO_(2)的脱除率分别为85.83%、96.00%和100%。机理研究表明:CH_(4)被微纳米气泡产生的自由基氧化成CO、CO^(2)和H2_(O),NO氧化成NO3^(-)和NO_(2)-,SO_(2)氧化成SO_(4)^(2-);Fe^(2+)和Mn^(2+)作为催化剂诱导微纳米气泡产生较多自由基。The micro-nano gas-liquid dispersion system was used to oxidize and remove multiple pollutants in the exhaust gas of natural gas vehicles.The experimental results show that:The removal rate of CH_(4),NO and SO_(2) increase firstly and then decreased with the increase of NaCl,SDS,Fe^(2+),and Mn^(2+)amount,and with the increase of pH under acidic or alkaline conditions;When the mass concentration of CH_(4),NO,SO_(2) in the inlet gas is 429,267,571 mg/m^(3),under the optimum removal conditions of absorbent pH 6,NaCl amount 0.5 g/L,SDS amount 4 mg/L and Mn^(2+)amount 2.0 mmol/L,the removal rate of CH_(4),NO,and SO_(2) are 85.83%,96.00%,and 100%,respectively.The results of mechanism researches indicate that:With radicals generated from micro-nano bubbles,CH_(4) is oxidized into CO,CO^(2) and H2_(O),NO intoand,SO_(2) into;Fe^(2+)and Mn^(2+)are used as catalysts to induce micro-nano bubbles to generate more free radicals.

关 键 词：微纳米气液分散体系 天然气汽车尾气 复合污染物 氧化脱除 

分 类 号：X511[环境科学与工程—环境工程]