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

• DOI: 10.1039/c8ra08143c
• Publication Date: 2019-01-24T16:14:40Z
• Authors: Siti Khadijah Hub...; Mohd Hafiz Dzarfa...; Siti Hamimah Shei...; Mohd Riduan Jamal...; Zawati Harun; Mohd Haiqal Abd Aziz; Mukhlis A. Rahman; Juhana Jaafar; Mikihiro Nomura; Sawao Honda; Yuji Iwamoto; Hamzah Fansuri
• Keywords: Membrane Distillation

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 were prepared amorphous (ASHFM) crystalline (CSHFM) ash modified to be via immersion fluoroalkylsilane (FAS) grafting of 1H,1H,2H,2H-perfluorodecyltriethoxysilane. Superhydrophobic angle values up 157° 161° obtained for ASHFM CSHFM, respectively. Remarkably, the surface morphology mimicked a look-alike lotus-leaf structure with decrement pore size after silane agent both membranes. effect arsenic pH (3-11), concentration (1-1000 ppm) feed temperature (50-80 °C) studied it found that had significant on permeate flux. flux 50.4 kg m-2 h-1 As(iii) 51.3 As(v), best tested In fact, can reject maximum contaminant level (MCL) limit 10 ppb under any conditions, no swelling mechanism observed testing 4 hours.