Experimental investigation and comparison of PBI/MWCNT and PSF/MWCNT membranes for recovering water from RO reject of brackish water by FO.

Autor: Venkatesh SS; Department of Chemical Engineering, AC Tech, Anna University, Chennai, 600 025, Tamil Nadu, India., Vellaichamy P; Department of Chemical Engineering, AC Tech, Anna University, Chennai, 600 025, Tamil Nadu, India., Thirumalachari S; Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600 036, Tamil Nadu, India., Ramalingam V; Institute for Energy Studies, Anna University, Chennai, 600 025, Tamil Nadu, India., Doraiswamy Raju M; Department of Chemical Engineering, AC Tech, Anna University, Chennai, 600 025, Tamil Nadu, India.
Jazyk: angličtina
Zdroj: Heliyon [Heliyon] 2024 Mar 27; Vol. 10 (7), pp. e28455. Date of Electronic Publication: 2024 Mar 27 (Print Publication: 2024).
DOI: 10.1016/j.heliyon.2024.e28455
Abstrakt: The performances of polybenzimidazole (PBI) and polysulfone (PSF) membranes for recovering water from reverse osmosis (RO) reject of brackish water through forward osmosis (FO) were assessed and compared. Non-functionalised multi-walled carbon nanotubes (MWCNT) were added to the membrane casting solutions, with concentrations ranging from 0 to 3 wt%. The experiment was conducted for eight samples using RO reject of brackish water as the feed solution (FS) and 2 M analytical grade MgCl 2 as the draw solution (DS). The hydrophilicity, water permeability, salt rejection rate (R s ), water flux (WF) and porosity of the membranes improved with increasing MWCNT content up to 2 wt%. Also, the structural parameter, salt permeability and reverse solute flux decreased. PBI/MWCNT 2 wt% exhibited the best performance among the membranes tested compared with porosity of 70 ± 4 %, structural parameter of 0.36 ± 0.2 μm, and R s of 93.5 %. In contrast with the pristine PBI membrane, an average water flux enhancement of 15 % and 49 % was observed for the FS and DS sides, respectively, for PBI/MWCNT 2 wt% . It is evident from the results that including MWCNT improves the performance of both membranes, with better relative performance for PBI membranes than PSF membranes.
Competing Interests: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(© 2024 The Authors.)
Databáze: MEDLINE
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