期刊
CHEMICAL ENGINEERING JOURNAL
卷 425, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130592
关键词
2D MoS2 nanosheets; Membrane separation; Heavy metal ion removal; Disulfides; PES membrane
资金
- KMUTT 55th Anniversary Commemorative Fund
- KMUTT
MoS2 nanosheets functionalized with polythiocyanuric acid (PTCA) showed strong adsorption onto polyethersulfone (PES) membranes. The modification increased the hydrophilicity of the materials and enhanced the removal efficiency of pollutants.
MoS2 nanosheets were functionalised by polythiocyanuric acid (PTCA) in varying ratios (MoS2:PTCA = 1:1, 1:2, 1:3). The modification enabled the materials to be strongly adsorbed onto polyethersulfone (PES) membranes without requiring prior exfoliation. This was in strong contrast to MoS2 itself. Spectroscopic characterisation indicated adhesion was through strong hydrophobic pi-pi* stacking and electrostatic interactions between PTCA and PES. Modification of the PES resulted in an increased hydrophilic character, as evidenced by a decreasing contact angle (78 degrees unmodified, 40 degrees - 50 degrees modified) and an increase in water uptake (WU) from 12.8% to 17 - 27% (%WU = [(W-w / W-d) - 1] x 100%, where W-w and W-d refer to wet and dry membrane weights, respectively). When modifying PES using different MoS2-PTCA ratios, increasing the PTCA content decreased the permeate flux and pure water flux, while increasing the % removal of congo red, Hg(II), Cr(VI) and Pb(II) to approximately 80%. The potency of the membranes is ascribed to the formation of lamellar structures with increased hydrophilicity and the synergy between the disulfide linkage and absorptive capabilities of the MoS2.
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