Polythiocyanuric acid-functionalized MoS2 nanosheet-based high flux membranes for removal of toxic heavy metal ions and congo red
| Autor: | Jyothi Mannekote Shivanna, Mithran Somasundrum, Werasak Surareungchai, Khantong Soontarapa, Muralikrishna Sreeramareddygari |
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| Rok vydání: | 2021 |
| Předmět: |
Chemistry
General Chemical Engineering Metal ions in aqueous solution 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Exfoliation joint Industrial and Manufacturing Engineering 0104 chemical sciences Congo red Contact angle chemistry.chemical_compound Adsorption Membrane Environmental Chemistry Lamellar structure 0210 nano-technology Nuclear chemistry Nanosheet |
| Zdroj: | Chemical Engineering Journal. 425:130592 |
| ISSN: | 1385-8947 |
| Popis: | 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 π-π* 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° unmodified, 40° – 50° modified) and an increase in water uptake (WU) from 12.8% to 17 – 27% (%WU = [(Ww / Wd) – 1] × 100%, where Ww and Wd 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. |
| Databáze: | OpenAIRE |
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