摘要
非均相催化臭氧氧化可通过产生强氧化性的活性氧物种(ROS)去除水中的有机污染物.然而在实际处理场景中,由于传质限制使水相中短寿命的ROS难以得到有效利用.因此,通过在管式陶瓷膜的孔隙内部负载Mg_(6)MnO_(8)制备催化陶瓷膜(CCM),从而将其催化臭氧产生的ROS限制在有效的扩散距离内,实现了污染物的高效去除.当CCM的孔径从1000 nm减小到100 nm时,由于纳米限域对ROS富集作用的增强,四环素的矿化率从49.8%提高到72.6%.此外,在实际水的处理中,该限域CCM在高效去除污染物的同时,还表现出优异的抗污染性能.实验结果表明,催化剂表面羟基的质子化和Mn位点上的电子转移协同诱导臭氧分解生成·OH和^(1)O_(2).该工作为通过纳米限域效应高效利用ROS去除水中难降解有机污染物提供了技术支撑.
Heterogeneous catalytic ozonation removes organic pollutants in water via the generation of powerful reactive oxygen species(ROS).However,the availability of short-lived ROS in aqueous bulk is low in practical treatment scenarios due to mass transfer limitations.Herein,efficient pollutant removal is achieved by loading Mg_(6)MnO_(8) into the pores of tubular ceramic membranes for preparation of catalytic ceramic membranes(CCM)to confine the generated ROS within an effective diffusion distance.When the pore size of the CCM is reduced from 1000 nm to 100 nm,the mineralization of tetracycline increases from 49.8%to 72.6%,which is attributed to the enhancement of ROS enrichment at the nanoscale.In addition,while the CCM with spatial confinement has efficient pollutant removal during the treatment of real water,it also exhibits excellent anti-fouling properties.The experimental results reveal that the protonation of surface hydroxyl groups of the catalyst and the electron transfer on the Mn sites synergistically induce the O 3 decomposition to generate·OH and ^(1)O_(2).The work provides technical support for the efficient utilization of ROS to remove refractory organic pollutants in water under nanoconfinement effect.
作者
路子杰
白昊昆
梁兰兰
陈硕
全燮
LU Zijie;BAI Haokun;LIANG Lanlan;CHEN Shuo;QUAN Xie(School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,China)
出处
《大连理工大学学报》
北大核心
2026年第1期32-39,共8页
Journal of Dalian University of Technology
基金
国家自然科学基金资助项目(U23A20101).
关键词
纳米限域效应
催化陶瓷膜
催化臭氧氧化
水处理
nanoconfinement effect
catalytic ceramic membrane
catalytic ozonation
water treatment
