| Autor: |
Thollwana Andretta Makhetha, Richard Motlhaletsi Moutloali |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Chemical Engineering Journal Advances, Vol 1, Iss , Pp 100005- (2020) |
| Druh dokumentu: |
article |
| ISSN: |
2666-8211 |
| DOI: |
10.1016/j.ceja.2020.100005 |
| Popis: |
ZIF-8@GO composites were successfully synthesized through the in-situ growth method and were subsequently employed as fillers in low amounts of 0.1–0.5 wt% in the preparation of polyethersulfone (PES) ultrafiltration (UF) membranes via phase inversion. The use of trimethylamine (TEA) was critical in controlling the ZIF-8 nanoparticle sizes at ca. 30–50 nm with uniform distribution on the GO sheets. The composition and physico-chemical properties of the composites were characterized using Brunauer, Emmett, and Teller (BET), powder X-ray diffraction (pXRD), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The incorporation of ZIF-8@GO composite improved the surface roughness and resulted in increased hydrophilicity of the PES membranes. Remarkably, the water permeation increased from ~28 (PES) to ~71 (Mh) L m−2h−1 at 100 kPa in the ZIF-8@GO composite membranes. The resultant UF composite membranes exhibited improved fouling resistance with ~90% water flux recovery at high composite loading with the recovery maintained for at least six cycles. The nanocomposites membranes rejected above 80% of Congo red dye through size exclusion mechanism. No other solute rejection mechanisms were observed for the lower molecular weight dyes resulting in their passage through the membranes (>80%) for both negatively and positively charged dyes. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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