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Removal of As(iii) and As(v) from water using green, silica-based ceramic hollow fibre membranes via direct contact membrane distillation

Hubadillah, Siti Khadijah and Othman, Mohd. Hafiz Dzarfan and Sheikh Abdul Kadir, Siti Hamimah and Jamalludin, Mohd. Riduan and Harun, Zawati and Abd. Aziz, Mohd. Haiqal and A. Rahman, Mukhlis and Jaafar, Juhana and Nomura, Mikihiro and Honda, Sawao and Iwamoto, Yuji and Fansuri, Hamzah (2019) Removal of As(iii) and As(v) from water using green, silica-based ceramic hollow fibre membranes via direct contact membrane distillation. RSC Advances, 9 (6). pp. 3367-3376. ISSN 2046-2069

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Official URL: http://dx.doi.org/10.1039/c8ra08143c

Abstract

Arsenite [As(iii)] and arsenate [As(v)] removal by direct contact membrane distillation (DCMD) using novel hydrophobic green, silica-based ceramic hollow fibre membranes derived from agricultural rice husk was investigated in this work. The green ceramic hollow fibre membranes were prepared from amorphous (ASHFM) and crystalline (CSHFM) silica-based rice husk ash and modified to be hydrophobic via immersion fluoroalkylsilane (FAS) grafting of 1H,1H,2H,2H-perfluorodecyltriethoxysilane. Superhydrophobic contact angle values up to 157° and 161° were obtained for ASHFM and CSHFM, respectively. Remarkably, the membrane surface morphology mimicked a look-alike lotus-leaf structure with decrement in pore size after grafting via the silane agent for both membranes. The effect of arsenic pH (3-11), arsenic concentration (1-1000 ppm) and feed temperature (50-80 °C) were studied and it was found that feed temperature had a significant effect on the permeate flux. The hydrophobic CSHFM, with a flux of 50.4 kg m -2 h -1 for As(iii) and 51.3 kg m -2 h -1 for As(v), was found to be the best of the tested membranes. In fact, this membrane can reject arsenic to the maximum contaminant level (MCL) limit of 10 ppb under any conditions, and no swelling mechanism of the membranes was observed after testing for 4 hours.

Item Type:Article
Uncontrolled Keywords:maximum contaminant levels, silica-based ceramics
Subjects:T Technology > TP Chemical technology
Divisions:Chemical and Energy Engineering
ID Code:87987
Deposited By: Yanti Mohd Shah
Deposited On:30 Nov 2020 21:44
Last Modified:30 Nov 2020 21:44

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