| In recent years, arsenic contamination has become a very serious environmental pollution problem. Currently, there is in urgent need of effective treatments to reduce the dangers of arsenic on human life. In this study, ultrafiltration (UF) combined with adsorption technique was put forward as a method to prepare a kind of composite membrane, which not only had the excellent membrane properties but also had the adsorption ability to arsenic.In this paper, the phase inversion method was taken to prepare poly (phthalazine ether sulfone ketone) (PPESK) UF membranes with different kind of inorganic/organic additives, and the effects of PPESK concentration and additives on PPESK UF membrane performances and arsenic adsorption properties were studied in detail.Through the experiments, the optimized PPESK membrane composition was confirmed as follow: 14 wt.% PPESK, N-methyl-2-pyrrolidone (NMP) as solvent,3.0 wt.% polyethylene oxide-poly propylene oxide-polyethylene oxide triblock copolymer (PEO-PPO-PEO) as first additive,3.0 wt.% oxalic acid as second additive and 1.2 wt.% JR05 nano-TiO2 as third additive. It was found that only optimized PPESK membranes and nano-TiO2 particles had the adsorption ability to arsenic. Meanwhile, optimized PPESK UF membrane has a bigger arsenic adsorbance than nano-TiO2 particles in the same water samples.For the application sthdy of optimized PPESK membrane, with the contact time increasing, the arsenic adsorption efficiency decreased from 100 to 73.7%; with the increase of operation pressure, the efficiency of arsenic adsorption led a light decrease which ranged from 86.6 to 70.8%; when the arsenic (V) concentration increased from 0 ppb to 0.5 mg/L, the arsenic adsorption efficiency reduced from 100 to 8.3%; the effect of feed temperature on arsenic adsorption was indistinctively; as the pH increasing from 3 to 11, the efficiency of arsenic adsorption first kept stable at 85.0%, and then decreased to 63.4%. |
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