Fabrication And Performance Of Carbonaceous Adsorbent-polysulfone Composite Membrane For Purification Of Organic Pollutants In Water

Bisphenol A is environmental estrogen,which has been detected in many rivers of our country.The conventional water treatment process cannot effectively remove bisphenol A in water,which threatens the safety of drinking water and human health.In order to reduce the concentration of bisphenol A in water,a series of carbonaceous adsorbent-polysulfone composite membranes were prepared in this paper,explored the properties of the adsorption/ultrafiltration technology to remove bisphenol A in water..In this paper,activated carbon,carbon nanotubes,mesoporous carbon and graphene,these four kinds of carbonaceous adsorbents were selected to fabricate carbonaceous adsorbents-polysulfone composite membranes.The effects of the type of carbonaceous adsorbent and the amount of carbonaceous adsorbent doping(0-15%)on the structure,physico-chemical properties,adsorption and filtration performance of composite membranes was investigated,the effect of solution environment on the removal of bisphenol A by membrane filtration was studied to simulate the actual engineering conditions.The main conclusions are as follows:(1)When the doping amount of carbonaceous adsorbent is 0.02g/g,the adsorption and filtration performance of composite membranes were better than pure polysulfone membrane.The filtration performance of activated carbon-polysulfone composite membrane is the best,followed by carbon nanotubes.(2)With the increased amount of carbon nanotubes,the adsorption capacity of the composite membrane is gradually increased and the filtration performance is improved.The M-CNT15 membrane maintained a 20% rejection of BPA molecules when the pure polysulfone membrane lost its interception ability.(3)The increased amount of activated carbon influenced the internal structure of the composite membrane.The saturated adsorption of bisphenol A increased from 10.58mg/g(without activated carbon)to 66.04mg/g(doping amount: 0.15g/g).Filtration performance significantly enhanced,The mass of M-AC15 intercepting bisphenol A is 7 times that of pure polysulfone membrane.(4)Under alkaline conditions,bisphenol A ionizated,the capacity of composite ultrafiltration membrane retenting bisphenol A is reduced.The presence of background ions and bisphenol A had competitive adsorption,the removal effect of the composite membrane reduced.