Fabrication of FeOCl/MoS2 catalytic membranes for pollutant degradation and alleviating membrane fouling with peroxymonosulfate activation. Issue 3 (June 2022)

• Record Type: Journal Article
• Authors: Sun, Xin; Zheng, Hongai; Jiang, Shuangyan; Zhu, Meilin; Zhou, Yao; Wang, Derui; Fan, Yankun; Zhang, Daquan; Zhang, Lizhi
• Is Part Of: Journal of environmental chemical engineering. Volume 10:Issue 3(2022)
• Publication Date: 2022-06
• Subjects: FeOCl -- MoS2 -- PMS activation -- Catalytic membrane -- Anti-fouling performance; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.107717
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: The combination of advanced oxidation (AOPs) and membrane separation technology provides a prospect for catalyst recovery and alleviation of membrane fouling. Herein, we prepared FeOCl/MoS2 catalysts for activating peroxymonosulfate (PMS) by a simple partial thermal decomposition method. Then, the FeOCl/MoS2 was immobilized onto a polyvinylidene fluoride (PVDF) membrane coated by polydopamine (PDA) through vacuum filtration. FeOCl/MoS2 can remove 96.9% of rhodamine B (RhB) within 5 min. Notably, with a pH range from 3 to 9, FeOCl/MoS2 exhibited high catalytic efficiency. Besides, the surface hydrophilicity of the PVDF membrane was significantly improved by the modification. The flux recovery rate (FRR) of the modified membrane reached 97.6%, which was 42.7% higher than that of the pristine membrane. With dead-end filtration, 72.2% of the pollutants can be removed. After 5 runs, the fabricated FeOCl/MoS2 membrane displayed good stability and high efficiency. The analysis of the mechanism showed that adding MoS2 to FeOCl can promote the reduction of Fe 3+ to Fe 2+ through the oxidation of Mo 4+ to Mo 6+ . The active species in this system were identified as SO4 -, OH, O2 -, and 1 O2 . SO4 - and 1 O2 were dominant. This research provides a new strategy for the development and application of membrane separation technology. Graphical Abstract: ga1 Highlights: FeOCl/MoS2 catalytic membranes were fabricated via vacuum filtration. The addition of MoS2 promoted the reduction of Fe 3+ to Fe 2+ . SO4 - and 1 O2 were dominant radicals in FeOCl/MoS2 +PMS system. The catalytic membrane exhibits excellent antifouling performance with flux recovery ratio of 97.6%.