Synergistic oxidation - filtration process analysis of catalytic CuFe2O4 - Tailored ceramic membrane filtration via peroxymonosulfate activation for humic acid treatment. (15th March 2020)

• Record Type: Journal Article
• Authors: Zhao, Yumeng; Lu, Dongwei; Xu, Chengbiao; Zhong, Jinying; Chen, Mansheng; Xu, Shu; Cao, Ying; Zhao, Qi; Yang, Mo; Ma, Jun
• Is Part Of: Water research. Volume 171(2020)
• Publication Date: 2020-03-15
• Subjects: Ceramic membrane -- Catalytic filtration -- Peroxymonosulfate oxidation -- Humic acid -- XDLVO theory; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2019.115387
• Languages: English
• ISSNs: 0043-1354

Abstract

Abstract: This work synthesized catalytic CuFe2 O4 tailored ceramic membrane (CuFeCM), and systematically investigated the intercorrelated oxidation - filtration mechanism of peroxymonosulfate (PMS)/CuFeCM catalytic filtration for treating humic acid (HA). PMS/CuFeCM filtration exhibited enhanced HA removal efficiency while reduced the irreversible fouling resistance as compared with the conventional CM filtration. Results from HA characterizations showed that PMS/CuFeCM catalytic filtration oxidized HA into conjugated structures of smaller molecular weight. The unsaturated bonds further caused the re-agglomeration of HA, hence enhancing the size exclusion of CuFeCM. Meanwhile, oxidized HA particles with changing physicochemical properties reduced the total attractive interaction energy between CuFeCM and HA, mainly attributed to the reduced acid-base interaction energy according to the Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) analysis. The changing of HA properties and HA-CuFeCM physicochemical interactions rendered more re-agglomerated HA particles retained above membrane with less attachment, which induced decreasing irreversible fouling resistance and facilitated easier external fouling removal by hydraulic cleaning. Overall, the PMS/CuFeCM configuration demonstrated in this study could provide a new insight into the synergistic oxidation - filtration interaction mechanism of hybrid catalytic ceramic membrane filtration process. Graphical abstract: Image 1 Highlights: CuFe2 O4 - coated ceramic membrane (CuFeCM) was prepared by sol-gel combustion. Humic acid structure changes by peroxymonosulfate/CuFeCM filtration were studied. Changing physicochemical interaction of humic acid-CuFeCM was analyzed. Oxidation-filtration mechanism of peroxymonosulfate/CuFeCM filtration was studied.