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https://hdl.handle.net/2440/132045
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Type: | Journal article |
Title: | Zn-MoS₂ nanocatalysts anchored in porous membrane for accelerated catalytic conversion of water contaminants |
Other Titles: | Zn-MoS(2) nanocatalysts anchored in porous membrane for accelerated catalytic conversion of water contaminants |
Author: | Yao, Y. Hu, H. Zheng, H. Wei, F. Gao, M. Zhang, Y. Wang, S. |
Citation: | Chemical Engineering Journal, 2020; 398:125455-1-125455-11 |
Publisher: | Elsevier |
Issue Date: | 2020 |
ISSN: | 1385-8947 1873-3212 |
Statement of Responsibility: | Yunjin Yao, Huanhuan Hu, Hongda Zheng, Fengyu Wei, Mengxue Gao, Yangyang Zhang, Shaobin Wang |
Abstract: | A series of Zn-MoS₂ heterostructures were fabricated via a thermal-treatment method, and then anchored in polyvinylidene fluoride (PVDF) to yield novel catalytic membranes (Zn-MoS₂@PVDF) by the phase inversion technique for enabling Cr(VI) reduction. The SEM image showed that ZnS nanoparticles homogeneously coated on the MoS₂ surface assembled in flower-like agglomerations. Zn-MoS₂@PVDF exhibited unprecedented activity of Cr(VI) reduction using formic acid (FA) as the reductant, with a high rate constant (k = 0.033 min−1) and low activation energy (Ea = 38.8 kJ mol⁻¹). Cr(VI) reduction rates effectively boosted with increasing FA dosages (0.234–1.170 M) and temperatures (15–55 ℃), but declined with the increase of Cr(VI) concentrations (5–25 mg/L), solution pHs (2.03–5.11) and inorganic salts. The excellent performance of Zn-MoS₂@PVDF originated from the synergistic effect of the unique composition and electronic structure of the membranes. The strong electronic interactions of ZnS and MoS₂ made an insignificant contribution to generate intermediate H*(ads) and released molecular hydrogen. Rich porosity of PVDF membranes might not only afford a uniform dispersion of the Zn- MoS₂ NPs, but also decrease mass transport resistance and provide an enlarged catalytic surface area. These outstanding characteristics indicate the potential applicability of Zn-MoS₂@PVDF membranes for the remediation of heavy metal pollution. |
Keywords: | Molybdenum disulphide; PVDF membrane; hexavalent chromium; formic acid; interfacial effect |
Rights: | © 2020 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.cej.2020.125455 |
Grant ID: | http://purl.org/au-research/grants/arc/DP190103548 |
Published version: | http://dx.doi.org/10.1016/j.cej.2020.125455 |
Appears in Collections: | Chemical Engineering publications |
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