环境化学
李学艳,高乃云,沈吉敏,马军,隋铭皓.O3/H2O2降解水中致嗅物质2-MIB的效能与机理[J].环境科学学报,2009,29(2):344-352
O3/H2O2降解水中致嗅物质2-MIB的效能与机理
- Efficiency and mechanism of degradation of 2-MIB by O3/H2O2 in water
- 基金项目：国家“十一五”科技支撑计划(No.2007BAC26B03);国家重点实验室开放基金(No.PCRRF08008);中国博士后科学基金(No.20080430685);国家自然科学基金(No.50708067);上海市自然科学基金(No.07ZR14116)
- 作者
- 单位
- 李学艳
- 同济大学污染控制与资源化研究国家重点实验室, 上海 200092
- 高乃云
- 同济大学污染控制与资源化研究国家重点实验室, 上海 200092
- 沈吉敏
- 城市水资源与水环境国家重点实验室, 哈尔滨工业大学市政环境工程学院, 哈尔滨 150090
- 马军
- 城市水资源与水环境国家重点实验室, 哈尔滨工业大学市政环境工程学院, 哈尔滨 150090
- 隋铭皓
- 同济大学污染控制与资源化研究国家重点实验室, 上海 200092
- 摘要：采用O3/H2O2工艺对水中致嗅物质二甲基异莰醇(2-methylisoborneol,2-MIB)的去除效能与机理进行了研究,探讨了H2O2与O3的投加方式、摩尔比以及溶液pH值和水质等因素对2-MIB降解的影响,并通过GC-MS对2-MIB的氧化降解中间产物进行了分析.实验结果显示,H2O2能明显促进O3对水中2-MIB的氧化降解,单独臭氧氧化20min时2-MIB的降解率为38.7%;在同样体系中加入适量的H2O2后2-MIB的降解率最大能提高到89.2%,H2O2与O3最佳投加摩尔比为0.6左右.低浓度(0.5mg·L-1)腐殖酸对O3/H2O2体系2-MIB的降解速率有比较明显的促进作用,高浓度的腐殖酸则会产生较明显的抑制作用;自由基捕获剂叔丁醇对O3/H2O2体系中2-MIB氧化降解具有明显的抑制作用.鉴定出2-MIB的氧化降解产物有4-羟基—1,7,7-三甲基双环[2,2,1]庚烷—2-酮、1,7,7-三甲基双环[2,2,1]庚烷—2,4-二酮、1,7,7-三甲基双环[2,2,1]庚烷—2-酮等,并对2-MIB氧化机制和降解的可能途径进行了推导.
- Abstract：The efficiency and mechanism of the degradation of 2-methylisoborneol (2-MIB) by O3/H2O2 in aqueous solution is investigated. The effects of molar ratio of hydrogen peroxide to ozone, method of addition of hydrogen peroxide and ozone, pHvalue and water quality on the degradation of 2-MIBduring the O3/H2O2 oxidation process are discussed. Hydrogen peroxide highly enhanced the removal efficiency of 2-MIBin water. The removal efficiency is only 38.7% by ozonation alone, but it reaches 89.2% after 20 minutes with the addition of H2O2 . The optimum molar ratio of H2O2/O3 was about 0.6. The presence of humic substances (HS) with concentration lower than 0.5mg·L-1 enhanced the removal efficiency of 2-MIBfrom the water. But high concentrations of HSinhibit the removal of 2-MIBby O3/H2O2. Tert-butanol, a typical free radical inhibitor significantly inhibited the removal of 2-MIB. The intermediate oxidation products of 2-MIBwere identified by GC-MSand include 4-hydroxy-1,7,7-trimethylbicyclo[2,2,1]heptan-2-one, 1,7,7-trimethylbicyclo[2,2,1]heptane-2,5-dione, and 1,7,7-trimethylbicyclo[2,2,1] heptan-2 -one. Based on these results, the mechanism and possible degradation pathway for 2-MIBare proposed.
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