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PVDF/palygorskite composite ultrafiltration membranes: Effects of nano-clay particles on membrane structure and properties
Abstract Palygorskite (PGS) was incorporated into a polyvinylidene fluoride (PVDF) matrix and PVDF/PGS nanocomposite UF membranes were prepared successfully via a combination of non-solvent-induced phase separation (NIPS) and thermally-induced phase separation (TIPS) processes. The influence of the size of the PGS particles (PGS-L, 450 nm and PGS-S, 302 nm) on the membrane pore structure, morphology, mechanical strength, filtration performance and antifouling property were investigated. The results showed that the PVDF/PGS-S composite membranes had higher porosity and lower overall membrane thickness and skin layer thickness. This directly resulted in better PWF, BSA flux, BSA rejection and FRR for the membranes loaded with PGS-S, when compared with the characteristics of PVDF/PGS-L membranes. Thus, the physical structures are dominant factors in determining the separation performance of PVDF/PGS composite membranes. However, the surface roughness and thermal stability of PVDF/PGS-L membranes were greater than those of PVDF/PGS-S membranes and their surface was also more hydrophilic. Moreover, they exhibited higher mechanical strength owing to stronger binding forces and lower porosity. Thus, the composite properties of PVDF/PGS UF membranes could be adjusted by controlling the scale of the inorganic filler.
Graphical abstract Display Omitted
Highlights Effects of PGS particle scale on membrane structure and properties were studied. PVDF/PGS-S membranes had higher porosities and lower overall membrane thicknesses. PVDF/PGS-L membranes had better thermal stabilities and mechanical strengths. PVDF/PGS-S membranes displayed better separation and antifouling performances.
PVDF/palygorskite composite ultrafiltration membranes: Effects of nano-clay particles on membrane structure and properties
Abstract Palygorskite (PGS) was incorporated into a polyvinylidene fluoride (PVDF) matrix and PVDF/PGS nanocomposite UF membranes were prepared successfully via a combination of non-solvent-induced phase separation (NIPS) and thermally-induced phase separation (TIPS) processes. The influence of the size of the PGS particles (PGS-L, 450 nm and PGS-S, 302 nm) on the membrane pore structure, morphology, mechanical strength, filtration performance and antifouling property were investigated. The results showed that the PVDF/PGS-S composite membranes had higher porosity and lower overall membrane thickness and skin layer thickness. This directly resulted in better PWF, BSA flux, BSA rejection and FRR for the membranes loaded with PGS-S, when compared with the characteristics of PVDF/PGS-L membranes. Thus, the physical structures are dominant factors in determining the separation performance of PVDF/PGS composite membranes. However, the surface roughness and thermal stability of PVDF/PGS-L membranes were greater than those of PVDF/PGS-S membranes and their surface was also more hydrophilic. Moreover, they exhibited higher mechanical strength owing to stronger binding forces and lower porosity. Thus, the composite properties of PVDF/PGS UF membranes could be adjusted by controlling the scale of the inorganic filler.
Graphical abstract Display Omitted
Highlights Effects of PGS particle scale on membrane structure and properties were studied. PVDF/PGS-S membranes had higher porosities and lower overall membrane thicknesses. PVDF/PGS-L membranes had better thermal stabilities and mechanical strengths. PVDF/PGS-S membranes displayed better separation and antifouling performances.
PVDF/palygorskite composite ultrafiltration membranes: Effects of nano-clay particles on membrane structure and properties
Wei, Dongyang (author) / Zhou, Shouyong (author) / Li, Meisheng (author) / Xue, Ailian (author) / Zhang, Yan (author) / Zhao, Yijiang (author) / Zhong, Jing (author) / Yang, Dawei (author)
Applied Clay Science ; 181
2019-06-07
Article (Journal)
Electronic Resource
English
Some physicochemical properties of a clay containing smectite and palygorskite
| Online Contents | 2009