二氧化碳阴离子自由基在水处理中的应用

Application of Carbon Dioxide Anion Radical in Wastewater Treatment

高级还原技术作为近年来新兴的水处理技术之一,主要通过外加能量激活常规的还原剂而产生强还原性自由基和水合电子,还原去除水中有机污染物、重金属离子、硝酸盐等毒性污染物.二氧化碳阴离子自由基(CO_(2)^(·-))作为一种还原性自由基,具有极强的还原性,能快速与水中多种污染物反应,在水处理中具有研究、开发和推广应用价值.结合国内外文献,介绍CO_(2)^(·-)的结构、理化性质和产生途径,以及其在去除水中有机氯、硝酸盐及重金属等污染物方面的应用,并详细论述影响降解效果的因素和降解机制.最后,对CO_(2)^(·-)的未来研究方向和应用前景进行展望.

Advanced reduction process is one of the emerging water treatment technologies in recent years.It mainly generates strong reducing radicals and hydrated electrons by activating conventional reducing agents with external energy to remove organic pollutants,heavy metal ions,nitrate and other toxic pollutants in wastewater.Carbon dioxide anion radical(CO_(2)^(·-)),as a reducing radi-cal,has a strong reducibility and can rapidly react with various pollutants in wastewater.It has great research and application value in wastewater treatment.In this manuscript,the structure,physicochemical properties and production pathways of CO_(2)^(·-) were briefly introduced.The application of CO_(2)^(·-) for the removal of pollutants such as organic chlorine,nitrate and heavy metals in wastewater were summered.The factors affecting the degradation and the degradation mechanism were discussed in detail.Finally,concluding remarks and some suggestions for the future research of CO_(2)^(·-) were proposed.