Preparation Of Supported MoS₂ QDs/TiO₂ Photocatalyst And Its Degradation Of Petroleum Pollutants In Seawater

To implement the"maritime power"strategy,we need to maintain the sustainable and healthy development of the Marine ecological environment.The environmental problem of Marine oil pollution has brought serious harm to Marine fishery,aquaculture and Marine environment.Therefore,the degradation and treatment of Marine oil pollutants is still an urgent problem to be solved.In this paper for effective degradation of water pollutants,full selection of tetrabutyl titanate as titanium source,using the sol-gel method(sol gol TiO₂catalyst precursor was prepared,with hollow glass beads（HGM）and activated carbon microspheres as the carrier,using the method of impregnation calcination successfully load catalyst film on the hollow glass beads and activated carbon microspheres,The supported photocatalysts were MoS₂QDs/TiO₂@HGM and MoS₂QDs/TiO₂@activated carbon microspheres,respectively.Petroleum ether solution was used as the simulated pollutant,and its photocatalytic oxidation performance was studied to explore the optimum conditions for the preparation of catalysts and the degradation efficiency of petroleum ether pollutants in seawater.The effects of controllable conditions on supported MoS₂QDs/TiO₂@HGM and MoS₂QDs/TiO₂@activated carbon microspheres were studied.X-ray diffraction（XRD）,scanning electron microscopy（SEM）,energy spectrum instrument surface element analysis（EDX）,X-ray photoelectron spectroscopy（XPS）and other techniques were used to characterize the composition,morphology and structure of the supported nano-photocatalyst samples.Through characterization analysis,MoS₂QDs/TiO₂photocatalyst was successfully supported on hollow glass microspheres and activated carbon microspheres.When the calcination temperature of TiO₂@HGM and TiO₂@activated carbon microspheres was 450℃,the optimal preparation conditions for the catalyst were supported twice.After doping MoS₂QDs,the photocatalytic reaction of seawater solution with petroleum ether as the simulated pollutant was 2h,and the degradation rate was measured.The influence of sol roasting time and loading times on the loading effect was investigated,as well as the influence of catalyst dosage,initial concentration of petroleum ether,and the doping amount of MoS₂QDs on the photocatalytic activity of the target pollutant.The results show that MoS₂QDs/TiO₂@HGM and MoS₂QDs/TiO₂@activated carbon microspheres have high catalytic activity.When the initial concentration of petroleum ether is 100mg/L,the p H of the solution is properly adjusted.Under these conditions,when the doping amount of 2wt%MoS₂QDs/TiO₂@HGM photocatalyst is 0.4 g,the degradation rate can reach 97%,and the catalytic performance is the best.On this basis,the catalytic performance of the photocatalyst with activated carbon microspheres as the carrier was further explored.The optimal condition was that when the doping amount of MoS₂QDs/TiO₂@activated carbon microspheres was 0.4 g,the degradation rate could reach 99.3%,and the degradation rate could still reach 89%after 5 cycles of experiments.It is proved that the catalyst has strong structural stability and can be reused.