Porous Hydrophobic–Hydrophilic Composite Hollow Fiber and Flat Membranes Prepared by Plasma Polymerization for Direct Contact Membrane Distillation

Autor:	Aishwarya A. Puranik, Ashok Sharma, Connor Colling, Stephen P. Conover, Kamalesh K. Sirkar, John Chau, Lydia N. Rodrigues, Saket Sharma, Adam Juelfs
Rok vydání:	2021
Předmět:	Materials science membrane distillation Filtration and Separation 02 engineering and technology engineering.material lcsh:Chemical technology Membrane distillation Article chemistry.chemical_compound 020401 chemical engineering Coating composite membrane Chemical Engineering (miscellaneous) lcsh:TP1-1185 Fiber lcsh:Chemical engineering 0204 chemical engineering hydrophilic porous hollow-fiber substrate plasma-polymerized hydrophobic fluorosiloxane coating Process Chemistry and Technology technology industry and agriculture lcsh:TP155-156 021001 nanoscience & nanotechnology Polyvinylidene fluoride Plasma polymerization Surface coating Membrane Chemical engineering chemistry engineering Surface modification 0210 nano-technology
Zdroj:	Membranes, Vol 11, Iss 120, p 120 (2021) Membranes Volume 11 Issue 2
ISSN:	2077-0375
DOI:	10.3390/membranes11020120
Popis:	High water vapor flux at low brine temperatures without surface fouling is needed in membrane distillation-based desalination. Brine crossflow over surface-modified hydrophobic hollow fiber membranes (HFMs) yielded fouling-free operation with supersaturated solutions of scaling salts and their precipitates. Surface modification involved an ultrathin porous polyfluorosiloxane or polysiloxane coating deposited on the outside of porous polypropylene (PP) HFMs by plasma polymerization. The outside of hydrophilic MicroPES HFMs of polyethersulfone was also coated by an ultrathin coating of porous plasma-polymerized polyfluorosiloxane or polysiloxane rendering the surface hydrophobic. Direct contact membrane distillation-based desalination performances of these HFMs were determined and compared with porous PP-based HFMs. Salt concentrations of 1, 10, and 20 wt% were used. Leak rates were determined at low pressures. Surface and cross-sections of two kinds of coated HFMs were investigated by scanning electron microscopy. The HFMs based on water-wetted MicroPES substrate offered a very thin gas gap in the hydrophobic surface coating yielding a high flux of 26.4–27.6 kg/m2-h with 1 wt% feed brine at 70 °C. The fluxes of HFMs on porous PP substrates having a long vapor diffusion path were significantly lower. Coated HFM performances have been compared with flat hydrophilic membranes of polyvinylidene fluoride having a similar plasma-polymerized hydrophobic polyfluorosiloxane coating.
Databáze:	OpenAIRE
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