文章摘要
Mg6MnO8负载管式陶瓷膜限域增强催化臭氧氧化去除水中难降解有机污染物
Mg6MnO8-loaded tubular ceramic membranes with spatial confinement for enhanced catalytic ozonation in removing refractory organic pollutants in water
投稿时间:2024-04-01  修订日期:2024-04-15
DOI:
中文关键词: 纳米限域  催化陶瓷膜  催化臭氧氧化  水处理
英文关键词: nanoconfinement effect  catalytic ceramic membrane  catalytic ozonation  water treatment
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位
路子杰 大连理工大学 环境学院 
白昊昆 大连理工大学 环境学院 
梁兰兰 大连理工大学 环境学院 
陈 硕 大连理工大学 环境学院 
全 燮* 大连理工大学 环境学院 
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中文摘要:
      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. 然而在实际的水处理中,由于传质限制使短寿命的ROS难以得到有效利用. 因此,通过在管式陶瓷膜的纳米膜孔内部负载Mg6MnO8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,以实现污染物的高效去除. 当CCM的孔径从1000 nm减小到100 nm时,四环素的矿化率从49.8%提高到72.6%,这是由于限域效应对ROS富集的增强. 此外,该限域催化膜在实际水的处理中高效去除污染物的同时,还表现出优异的抗膜污染性能. 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1O2. 本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.
英文摘要:
      Heterogeneous catalytic ozonation removes organic pollutants in water via oxidation 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 and quenching of water constituents. Herein, we achieved efficient pollutant removal by loading Mg6MnO8 into the pores of tubular ceramic membranes (denoted as CCM) to confine the generated ROS within an effective diffusion distance. When the pore size of the membrane was reduced from 1000 nm to 100 nm, the mineralization of tetracycline by CCM increased from 49.8% to 72.6%, which was attributed to the enhancement of ROS enrichment at the nanoscale. In addition, the CCM with spatial confinement had excellent anti-fouling properties and exhibited efficient pollutant removal during the treatment of real water. The experimental results revealed that the protonation of surface hydroxyl groups of the catalyst and the electron transfer on the Mn sites synergistically induced the O3 decomposition to generate ·OH and 1O2. The work provides technical support for the efficient utilization of ROS to remove refractory organic pollutants in water under spatial confinement.
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