Adsorption Photocatalysis Synergistic Effect During The Enhanced Photocatalytic Degradation Of Organic Pollutants

Water pollution,as an important part of environmental pollution,seriously affects people's normal life and production.The organic pollutants have seriously affected people's water safety.In order to overcome the drawbacks of single photocatalytic oxidation technology and adsorption purification technology in the removal of organic pollutants in water,the graphene hybrid zinc oxide composite(ZnO/rGO)was prepared.Graphene hybrid zinc oxide hydrogel(ZnO/rGO-rGH)was prepared by combining graphene hybrid zinc oxide with a large amount of graphene.The effects of different ratios of ZnO/rGO on the photodegradation efficiency of phenol were studied.When the loading of graphene was 0.5 wt.%,the photodegradation efficiency of ZnO/r GO to phenol was as high as 98% in 12 minutes,and the photodegradation efficiency of the composite was 2.5 times higher than that of the zinc oxide.The adsorption of bisphenol A on the composite hydrogel was in accordance with the pseudo-second-order kinetics model and Langmuir isotherm model.ZnO/r GO-rGH could remove bisphenol A completely by adsorption photocatalytic synergism under static conditions.The macro-hydrogel structure of ZnO/rGO-rGH made the catalyst easy to recover,and the purification efficiency could reach more than 90% after repeated 5 times.The adsorption photocatalytic synergetic effect of ZnO/rGO-rGH on bisphenol A removal at different initial concentrations and different flow rates were studied.The composite hydrogels could completely purify bisphenol A in 16 hours by adsorption photocatalytic synergetic.However,the adsorption could be maintained for 4 hours.