A hydrophilic-oleophobic chitosan／SiO₂ composite membrane to enhance oil fouling resistance in membrane distillation
A hydrophilic-oleophobic chitosan／SiO₂ composite membrane to enhance oil fouling resistance in membrane distillation / Fatemeh Ardeshiri, Ahmad Akbari, Majid Peyravi, Mohsen Jahanshahi
p. 255-264 ; 29 cm
수록자료: Korean journal of chemical engineering. Korean Institute of Chemical Engineers. Vol.36 No.2(2019 February), p. 255-264 36:2<255 ISSN 0256-1115 저자: Fatemeh Ardeshiri, Nanotechnology Institute, Babol Noshirvani University of Technology ; Institute of Nanoscience and Nanotechnology, University of Kashan 저자: Ahmad Akbari, Institute of Nanoscience and Nanotechnology, University of Kashan ; Department of Carpet, Faculty of Architecture & Art, University of Kashan 저자: Majid Peyravi, Nanotechnology Institute, Babol Noshirvani University of Technology 저자: Mohsen Jahanshahi, Nanotechnology Institute, Babol Noshirvani University of Technology
To develop an inexpensive and simple technology and increase anti-oil fouling resistance for membrane distillation applications, a hydrophilic/oleophobic nanocomposite membrane was fabricated by using SiO2/Chitosan (CT) sol solution coating with different volume ratios (0.5 : 1, 1 : 1 and 2 : 1 v/v) on PVDF membrane surface. The formation of SiO₂/CT layer on membrane surface was confirmed by Fourier transform infrared (FTIR) spectroscopy and energy-dispersive X-ray spectroscopy (EDX). The influence of hydrophilic nanocomposite layer on the characteristics of membranes, including in-air water contact angle, morphology, porosity, liquid entry pressure of water (LEPw) and direct contact membrane distillation (DCMD) performance, was investigated. The results show that the composite membrane (SiO₂/CT (1 : 1 v/v)- PVDF membrane) by adding of 0.5 and 1 g/L gasoline concentrations not only incurred fouling but also a higher flux with respect to the neat membrane in each gasoline concentration. During 8 hours continuous desalination process of saline gasoline emulsion solution (20 gr/L NaCl solution containing 0.5 gr/L gasoline), it was found that all modified membranes had high performance stability in comparison with the neat membrane, the modified membrane showed high performance stability and flux without decreased salt rejection (99.9%). At the end, we conducted performance comparison between the prepared membranes in current work and presser based process.