Study on the properties of a nanofiltration membrane with O-MoS2 nano-composite substrate and the applications in dye wastewater treatment

A novel thin-film nanofiltration (NF) membrane was prepared successfully by interfacial polymerization of piperazine and trimesoyl chloride on a porous molybdenum disulfide oxide (O-MoS2) modified polysulfone (PSf) substrate with greatly enhanced separation performance. In this work, scanning electr...

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Bibliographic Details
Published in:Desalination and water treatment 2022-10, Vol.273, p.126-138
Main Authors: Wang, Yiwen, Jiang, Qinliang, Fan, Hua, Wang, Lihe, Xiong, Jihai, Luo, Jianquan
Format: Article
Language:English
Subjects:
Dye wastewater
Molybdenum disulfide oxide (O-MoS2)
Nanocomposite substrate
Nanofiltration membrane
Treatment
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Summary:A novel thin-film nanofiltration (NF) membrane was prepared successfully by interfacial polymerization of piperazine and trimesoyl chloride on a porous molybdenum disulfide oxide (O-MoS2) modified polysulfone (PSf) substrate with greatly enhanced separation performance. In this work, scanning electron microscopy confirmed that the optimized PSf substrate formed elongated finger-like pores during the phase inversion process, significantly different from other membranes and key to improving the water transport and desalination of the membrane. The effects of different dye molecular structures, varieties, and charges, and the feed solution and salt concentrations in the blend solution on salt and dye rejection and water flux of NF membranes were explored. Compared with the control membrane, the optimized membrane’s rejection performance and water permeability were greatly improved when treating simulated dye wastewater. After the introduction of O-MoS2 (0.06 wt.%), the introduction of O-MoS2 increased the chromotropic acid 2B and Rose Bengal rejection rates of the membrane compared to the original, from the original of 97.73%, 99.79% to 99.41% and 99.99%, respectively, and the water flux enhanced from the beginning of 32.8, 32.0–43.2 and 43.7 L/m2·h, respectively. Furthermore, in a 120 h simulated dye wastewater treatment stability test, the optimized F6 membrane showed stronger flux stability and excellent rejection performance, providing its vast potential for application in dye wastewater treatment.
ISSN:1944-3986
1944-3986
DOI:10.5004/dwt.2022.28865