摘要
微纳米气泡比表面积大,气泡内部压力远高于外部压力,在液相中停留时间长,具有强氧化等特性。利用微纳米气泡发生器将水、空气和NO混合产生微纳米气泡气液体系用于NO的吸收。结果表明,NO体积浓度为1 250×10^(-6),pH=7,NO的氧化吸收效率可以达到50.1%。在水相中加入Fe^(2+)后,NO体积浓度为3 750×10^(-6),pH=5,NaCl质量浓度为0.5 g/L,十二烷基硫酸钠(SDS)质量浓度为6 mg/L时,Fe^(2+)摩尔浓度为2 mmol/L,NO的吸收效率可以达到82.1%。加入Mn^(2+)后,其他条件不变,当Mn^(2+)摩尔浓度为2 mmol/L时,NO吸收效率可以达到92.3%。
With the property of large surface area, higher internal pressure than the external pressure and strong oxidation,micro-nano bubbles, remaining in the liquid phase for long, was used for the absorption of NO. In this experimental study, a micro-nano bubble generator was used to mix water with air and NO to produce the gas-liquid system of micro bubbles,which was to be used to absorb NO. The experimental result showed that as NO volume concentration was 1 250×10^-6, pH value of the system being equal to 7, oxidation and absorption efficiency of NO reached 50.1%; and NO absorption efficiency could reach up to 82.1% on condition that Fe^2+was added into the aqueous phase, NO volume concentration was 3 750×10^-6,NaCl mass concentration 0.5 g/L, sodium dodecyl sulfate(SDS) concentration 6 mg/L, the concentration of Fe^2+ 2 mmol/L,and p H value of the system being 5. In addition, if Mn^2+(concentration of Mn^2+was 2 mmol/L) instead of Fe^2+was added into the aqueous phase, other conditions remained unchanged, the absorption efficiency of NO could reach as high as 92.3%.
作者
阳光辉
姜东
夏华磊
李登新
YANG Guanghui;JIANG Dong;XIA Hualei;LI Dengxin(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2018年第8期135-138,152,共5页
Environmental Science & Technology
基金
国家自然科学基金钢铁联合基金(U1660107)
关键词
微纳米气泡
氮氧化物
氧化吸收
micro-nano bubbles
nitrogen oxides
oxidation and absorption