• 关键词：石墨烯-二氧化钛电活性膜  对氯间二甲苯酚  降解  电催化  环境和饮用水安全风险

• 基金项目：国家重点研发计划（No.2019YFC0408701）

• 白昱
• 清华大学环境学院，北京 100084

• 周律
• 清华大学环境学院，北京 100084

• 辛怡颖
• 清华大学环境学院，北京 100084

• 马可可
• 清华大学环境学院，北京 100084

• 张泽翰
• 清华大学环境学院，北京 100084

• 陈明如
• 清华大学环境学院，北京 100084

• 周岳溪
• 清华大学环境学院，北京 100084;中国环境科学研究院，北京 100012

• 摘要：研究了石墨烯-二氧化钛电活性膜（rGO-TiO₂ EM）降解对氯间二甲苯酚（PCMX）的机理及其出水对水环境和饮用水的安全性，采用有机-肼还原和真空抽吸法制备rGO-TiO₂ EM，分析TiO₂添加量对rGO-TiO₂ EM降解能力的影响，并对其降解PCMX的影响因素、活性物质作用、反应动力学和生物毒性变化进行研究.结果表明，在rGO-TiO₂ EM中，TiO₂与GO质量比应小于1：5；在停留时间为6.78 min，电流密度为4.42 mA?cm^-2，通量为132.64 L?m^-2·h^-1，PCMX初始浓度为 10 mg?L^-1的初始条件下，PCMX去除率可达82.6%，说明了rGO-TiO₂ EM的高效性；随着TiO₂添加量的增加，PCMX的降解效率和副产物生成量下降，然而降解产物毒性上升，可知生成的副产物生物毒性均低于PCMX本身，对水环境和饮用水具有安全性；提高rGO-TiO₂ EM运行过程中单位体积水量的电能投入不仅能提高降解效果，还能减少副产物的生成，保证水环境和饮用水的安全；rGO-TiO₂ EM降解PCMX主要的机理为直接反应.综上所述，rGO-TiO₂ EM方法具有高效、副产物较少及环境和饮用水安全风险较低等特点，是值得进一步研究和应用的方法.

• Abstract：To investigate the mechanisms and safety risks in water environment and drinking water of parachlormetaxylenol （PCMX） degradation by rGO-TiO₂ electroactive membrane （rGO-TiO₂ EM）， organism-hydrazine reduction method and vacuum pumping method were applied for rGO-TiO₂ EM preparation； effects of catalytic performance varied with addictive amount of TiO₂ were studied； influence factors， action of active species， apparent reaction kinetics and biotoxicity were illustrated. The results showed that mass ratio of TiO₂ and GO should be less than 1：5 in preparation of rGO-TiO₂ EM. When HRT was 6.78 min， current density 4.42 mA?cm^-2， membrane flux 132.64 L?m^-2?h^-1， PCMX initial concentration 10 mg?L^-1， degradation rate was 82.6%， which illustrated high efficiencies of rGO-TiO₂ EM. With increasing amount of TiO₂， degradation performances and by-products generation diminished， but biotoxicity ascended， therefore the by-products were hypotoxicity than PCMX and security for water environment and drinking water. Improving electrical energy in a unit quantity of water could not only increase degradation effect， but also reduce byproducts and ensure safety for water environment and drinking water. The degradation of PCMX by rGO-TiO₂ EM were mainly dominated by direct reactions. Above all， rGO-TiO₂ EM method was characterized as higher efficiency， less by-products， and lower safety risk for water environment and drinking water， therefore it was worthy to be studied and applied.

• Key words：rGO-TiO₂ electroactive membrane  parachlormetaxylenol  degradation  electrocatalysis  safety for water environment and drinking water

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