Adsorptive removal and oxidation of model organic pollutant BPA from water using a novel membrane

摘要

To find a new and cost-effective method to remove and mineralize trace organic pollutants, a series of composite functional membrane containing ACF powder(<240 mesh) and Ce 3+ -TiO2, a combination of adsorbent and photo-catalyst, was prepared by using a sol-gel and dip coating method on PET filter cloth. BPA (bisphenol A) at a level of 10mg/L was separated by adsorption onto the membrane in a series of batch experiments successfully and partly removed in dynamic filtration and adsorption test, in which removal of solid suspends such as Kaolinite may be combined. The measured adsorption of BPA corresponds to 37.0, 70.6 and 62.2 mg (BPA)/g (ACF) for membrane A,B and C, where the weight ratio of ACF to ACF+TiO2 was 29.9, 17.6 and 11.3% respectively in batch adsorption test (50ml solution) and 25.5 mg(BPA)/g(ACF) for membrane A after 2h adsorption in 200ml solution. After dynamic filtration, the total adsorption capacity was 81.0 mg (BPA)/g(ACF) for membrane A. It is noteworthy that the membrane adsorption can be regenerated by UV/Fenton. Order of BPA adsorption quantity is 1 st >2 nd > 3 rd time use for membrane C, due to loss of ACF resulted from the supersonic treatment before regeneration. Introducing TEOS in the preparation of sol gel solution and subsequent coating to form composite membrane, improved membrane adsorption stability after regeneration treatment by UV-Fenton.