MoS2/polyaniline (PANI)/polyacrylonitrile (PAN)@BiFeO3 bilayer hollow nanofiber membrane: Photocatalytic filtration and piezoelectric effect enhancing degradation and disinfection

Li Lin; Qing He; Yuexing Chen; Bolin Wang; Li Zhang; Xianxiang Dai; Yuanyuan Jiang; Hui Chen; Jinqiu Liao; Yihang Mao; Yunsong Zhang; Ying Wang

doi:10.1016/j.jcis.2023.04.069

MoS₂/polyaniline (PANI)/polyacrylonitrile (PAN)@BiFeO₃ bilayer hollow nanofiber membrane: Photocatalytic filtration and piezoelectric effect enhancing degradation and disinfection

J Colloid Interface Sci. 2023 Aug 15:644:29-41. doi: 10.1016/j.jcis.2023.04.069. Epub 2023 Apr 18.

Authors

Li Lin¹, Qing He¹, Yuexing Chen², Bolin Wang¹, Li Zhang¹, Xianxiang Dai¹, Yuanyuan Jiang¹, Hui Chen³, Jinqiu Liao⁴, Yihang Mao¹, Yunsong Zhang⁵, Ying Wang⁶

Affiliations

¹ College of Science, Sichuan Agricultural University, Yaan 625014, China.
² Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 32000, Israel.
³ College of Life Science, Sichuan Agricultural University, Yaan 625014, China.
⁴ College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Yaan 625014, China.
⁵ College of Science, Sichuan Agricultural University, Yaan 625014, China. Electronic address: yaanyunsong@sicau.edu.cn.
⁶ College of Water Conservancy and Hydropower Engineering, Sichuan Agricultural University, Yaan 625014, China. Electronic address: wangying@sicau.edu.cn.

PMID: 37094470
DOI: 10.1016/j.jcis.2023.04.069

Abstract

A novel MoS₂/polyaniline (PANI)/polyacrylonitrile (PAN)@BiFeO₃ bilayer hollow nanofiber membrane (PPBM-H) was successfully synthesized by coaxial electrospinning technique. In the nanofiber, BiFeO₃ nanoparticles (NPs) and MoS₂ nanosheets (NSs) were loaded in the middle and outer layers of the PANI/PAN composites, respectively, which constructs a type II heterojunction with spatially separated microtopography, thus significantly improving the charge separation in photocatalysis. Moreover, the hollow structure and the vast number of exposed groups on the surface of PPBM-H help to improve the mass transfer efficiency and pollutant adsorption performance in wastewater treatment. In addition, PPBM-H can generate H₂O₂ by in-situ activation of BiFeO₃/MoS₂ for photo-Fenton catalysis, enabling Fe³⁺ and Fe²⁺ recycling. Also, PPBM-H can produce piezoelectric polarisation under ultrasonic excitation, which can further enhance the efficiency of electron/hole separation and transfer, and induce the generation of active free radicals. Owing to its wonderful self-cleaning effect, the PPBM-H has good mechanical strength (2.95 Mpa), hydrophilicity (11.6°), water flux (1248 L·m^-2·h^-1), BSA rejection (98.8 %), and exhibits distinguished photocatalytic filtration efficiencies (99.5 % tetracycline hydrochloride (TCH) and 99.9 % methyl orange (MO) within 60 min), piezo-photocatalysis (99.2 % TCH within 2 h), disinfection performance for Escherichia coli (E. coli) (100 %, within 60 min).

Keywords: Disinfection; Heterojunction; Membrane filtration; Photo-Fenton; Piezoelectric photocatalysis.