无金属电气化膜用于污染物氧化:膜排斥和纳米封闭之间的协同效应
Wenli Jiang1, Muhammad Rizwan Haider2, Yanghua Duan3
1School of Civil & Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, PR China; Department of Civil & Environmental Engineering, University of California, Berkeley, CA 94720, United States; Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
Water research
|November 17, 2023
概括
一种新型的无金属电-芬顿膜,使用化碳纳米管和减少的氧化石墨烯有效地去除超过95%的污染物. 这种先进的材料为实际水处理提供了一个有前途的解决方案,具有增强的催化活性和耐用性.
科学领域:
- 环境科学与工程环境科学与工程
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
背景情况:
- 传统的电-芬顿工艺面临由于金属催化剂耗尽,不平衡的过氧化 (H2O2) 生产和激活以及低反应性物种度的限制.
- 这些挑战阻碍了电动芬顿在水处理应用中的效率和实用性.
研究的目的:
- 开发和优化一种无金属的电-芬顿膜,用于高效的水处理.
- 调查化碳纳米管 (N-CNT) 和减少氧化石墨烯 (RGO) 在H2O2生成和激活中的催化作用.
- 提高污染物去除效率并探索催化氧化过程的潜在机制.
主要方法:
- 使用N-CNT和RGO制造一个无金属的电-芬顿膜.
- 优化膜组成 (N-CNT/RGO比) 和前体 (尿素) 以提高性能.
- 评价污染物去除效率,水流和性能在不同的污染物度和pH值.
- 利用度-催化氧化模型来阐明反应机制并优化反应堆配置.
主要成果:
- 优化膜 (67%的N-CNT,尿素前体) 在一次通过中,在63 L m-2 h-1.1 的水流量下,实现了超过95%的污染物去除.
- 膜在广泛的pH范围 (3-9) 和污染物度 (1-10毫克L-1) 中表现出高效的污染物转化.
- 度-催化氧化模型显示,由于膜表面附近的污染物度升高,转化速率提高了40%.
- 在膜孔内的纳米封闭显著放大了基 (•OH) 度,使转化速率常数增加了105倍.
结论:
- 开发的无金属电-芬顿膜,集成N-CNT和RGO,有效地克服了传统工艺的局限性.
- 与纳米封闭相结合的N-CNT和RGO的协同催化作用导致了优越的污染物降解效率.
- 膜具有出色的耐用性,低能耗和广泛的适用性,将其定位为实际水处理的有希望的技术.
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