Uio-66 particles embedded PVDF hollow fiber membrane for arsenate removal
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Excessive arsenate in drinking water is a threat to human health. In this study, UiO-66 particles embedded PVDF hollow fiber membrane (HFM) was fabricated for the removal of arsenate from aqueous solutions. This study examined combining adsorption and membrane filtration for arsenate treatment, the results showed that the technology could remove arsenate efficiently. UiO-66 particles were synthesized first and evaluated by batch adsorption experiments including adsorption isotherm, pH effect and kinetics tests. The as-prepared UiO-66 particles had a BET surface area of 918 m2/g. The maximum adsorption capacity of UiO-66 was 267 mg/g at pH4.7, which was ranked at the top of all sorbents reported for arsenate removal. UiO-66 particles were active for arsenate in a wide pH range from 1 to 10, with the adsorption capacity reaching the highest at pH2.5. UiO-66 particles were then placed into PVDF HFM to treat solutions containing 100ppb of arsenate. As (V) removal performances were studied for 6 types of UiO-66 embedded HFM with different UiO-66 contents, and the filtration experiments were conducted at pH4.7 and a constant ionic strength of 0.05 mol/L controlled by NaNO3. Experiments demonstrated that the raw HFM with no UiO-66 particles could not remove arsenate from water, which was expected due to the large pores of HFM, but the adsorption capacity was increased significantly after the addition of UiO-66 particles. With a membrane surface area of 0.0045 m2, a maximum permeate volume of 34L could be obtained prior to arsenate breakthrough at 10ppb. The UiO-66 particles-embedded HFM was characterized by morphology, hydrophilicity, rejection, and ATR-FTIR.