摘要
传统的电催化技术受限于阴极原位电生H_(2)O_(2)的效率,且对某些特定结构污染物的降解能力较差。为提升电极对污染物降解性能和稳定性,使用压片法制备了蒽醌修饰碳纳米管(CNT/TBAQ)电极,构建了一种基于浸没电极的电催化臭氧反应器,并鉴定了反应体系内的活性物质及对西玛津的降解性能。结果表明,当气体流量为0.2 L·min^(-1),电流密度为7.5 mA·cm^(-2)时,HO·生成量为1.024μmol·L^(-1)。与单独电催化和单独臭氧技术相比,电催化臭氧技术可以在6 min内完全去除初始质量浓度为5 mg·L^(-1)的西玛津。当臭氧质量浓度10 mg·L^(-1),电流密度7.5 mA·cm^(-2)时,电催化臭氧技术的矿化效率最高,120 min后TOC去除率为62.25%,相比于电催化氧化、臭氧氧化能耗分别下降了55%和31%,但电催化臭氧技术没有明显降低西玛津中间产物的毒性。经过10次循环使用后,CNT/TBAQ阴极仍然保持对污染物的去除能力。以上结果表明,以CNT/TBAQ电极为阴极的电催化臭氧技术可以有效提高污染物降解效率,为微量污染物去除提供了一种有前景的技术。
Conventional electrocatalytic technology is limited by the efficiency of in-situ electrogenerated H_(2)O_(2)over the cathode,and poor degradability for some pollutants with specific structures.In order to increase the pollutant degradation performance and the stability of electrodes,a self-made anthraquinone-modified carbon nanotube(CNT/TBAQ)electrode was taken as the cathode,and an electro-peroxone reactor based on the submerged and aerated electrode was constructed,which performance on the degradation of simazine by the active substances in the electro-peroxone system was studied.The results showed that the HO·generation was1.024μmol·L^(-1)at the gas flow rate of 0.2 L·min^(-1)and the current density of 7.5 mA·cm^(-2).Compared with the technology of electrocatalysis or ozone alone,the electro-peroxone technology could completely remove simazine with an initial concentration of 5 mg·L^(-1)within 6 min.When the O_(3) concentration was 10 mg·L^(-1)and the current intensity was 7.5 mA·cm^(-2),the mineralization efficiency of electro-peroxone technology was the highest,with the TOC removal rate of 62.25%after 120 min,and the energy consumption was reduced by 55%and 31% compared with electro-catalytic oxidation and ozonation,respectively.However,the electro-peroxone technology did not significantly reduce the toxicity of simazine intermediates.The cathode of the CNT/TBAQ still retained the pollutant removal capacity after ten cycles of use.These results showed that electro-peroxone technology using CNT/TBAQ electrode as the cathode could effectively increase the pollutant degradation efficiency,and provide a promising technology for the removal of trace pollutants.
作者
黄星星
王耀龙
敖钰洁
卢金锁
HUANG Xingxing;WANG Yaolong;AO Yujie;LU Jinsuo(School of Environmental and Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Shaanxi Provincial Key Laboratory of Environmental Engineering,Xi'an 710055,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2024年第2期441-449,共9页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金面上项目(5197080658)。
关键词
蒽醌
农药
羟基自由基
生物毒性
电催化臭氧
anthraquinone
pesticide
hydroxyl radical
bio-toxicity
electro-peroxone
