Degradation Efficiency Of Carbamazepine By Photofenton Catalytic Ceramic Membrane Coupling Process

Due to the rapid changes of the society,various environmental problems are gradually emerging,among which the problem of water pollution is particularly prominent.Pharmaceutical and Personal Care Products?PPCPs?are a new class of pollutants.The microbial degradation of these compounds has been one of the hotspots and difficulties in the field of environmental biology Carbamazepine,as a typical PPCPs pollutant,is difficult to biodegrade due to its complex structure.In addition,low temperature will seriously inhibit the metabolic activity of microorganisms and weaken their degradation efficiency of PPCPs.In order to efficiently and environmentally friendly treat antibiotic wastewater,this experiment used silane coupling method to prepare photo-Fenton ceramic membrane for treatment of carbamazepine in wastewater,and to find the best conditions for loading ceramic membrane and treatment of carbamazepine,so as to set up batch experimental reaction device and continuous flow experimental device.The degradation of carbamazepine under different light intensity,catalyst load,antibiotic concentration and H₂O₂concentration was studied.Around the above content,the experiment mainly carried out the following work.1.The photocatalytic ceramic membrane was prepared by precipitation method and characterized by covalent method.The crystal is consistent with the standard card of Fe OOH JCPDS,and has obvious response to ultraviolet light.The surface of the modified ceramic film is covered with photocatalyst Fe OOH;Fe,Al and O elements were detected on the surface.The XRD images showed that both the diffraction peaks of the photocatalyst with Fe OOH and the diffraction peaks of both titano-Al₂O₃and Ti O₂were observed.2.Eight silane coupling agents including KH550,KH560,KH570,KH580,KH590,KH602,KH791 and KH792 were selected for load study.The solutions with concentration of 0.5%,1%and 1.5%were respectively taken as 0.1m L,0.2 m L and0.3m L suspensions,respectively,and 0.036 g of catalyst was weighed and added to the coupling agent suspension.The results showed that when the concentration of 1.5%coupling agent suspension reached 3 m L,the ceramic membrane with silane coupling agent KH550,KH560,KH580 and KH791 were loaded with more catalysts,and the remaining four ceramic membranes had few catalysts.3.The batch and continuous flow devices were constructed with the silane coupling agent KH550,KH560,KH580 and KH791 loaded ceramic membrane and the degradation experiment of carbazepine was carried out.The results showed that the degradation rate of carbazepine was the highest when the hydrogen peroxide concentration was 2.5 m M,and the degradation effect of photocatalytic ceramic membrane was proportional to the catalytic dose of surface load.The degradation rate and degradation rate of carbamazepine were the highest in the time-catalyzed ceramic membrane with the light intensity of 1614?W·cm^-2.Use of two systems?light catalyst system,heterogeneous fenton ultraviolet light-ceramic membrane separation system?under the optimal conditions of carbamazepine degradation experiment,the analysis of the degradation process of carbamazepine TOC removal rate,concentration of H₂O₂and the change of the concentration of NH₄⁺-N,further verify the heterogeneous fenton ultraviolet technology and coupling effect of membrane separation technology and its advantage.4.The ceramic membrane was cleaned by chemical cleaning method.After ten experiments,the flux of photocatalytic ceramic membrane hardly changed.The photocatalytic ceramic membrane is only blocked on the surface and is reversible,so the flux of the ceramic membrane can be restored to the original level after chemical cleaning.