Collaborative Treatment Of Organic Pollutants In Water By Solar Steam And Photo-Fenton

The solar steam and photo-Fenton cooperative treatment of organic pollutants in water technology takes advantage of the advantages of solar thermal steam and photo-Fenton in improving the removal efficiency and energy utilization of organic pollutants.Solar steam technology processes wastewater by evaporation,but high-boiling-point organic pollutants concentrate in the mother solution when they evaporate,while low-boiling-point organic pollutants are evaporated with steam.By combining solar steam technology with photo-Fenton technology,clean water can be obtained while treating complex and high-concentration organic pollutants in water.In this study,Prussian blue（PB）was selected as the catalytic center for Fenton degradation,and polypyrrole（PPy）was selected as the photothermal center.r GO was used as the framework,polyvinyl alcohol（PVA）was used as the substrate,and slow-drying paper was used as the support,to prepare three different new photothermal catalytic degradation materials,which were used to construct a solar steam cooperative photo-Fenton treatment system for organic pollutants in water.Chosen PB as the Fenton catalyst material,PPy as the photothermal material,and r GO as the framework,an efficient Fenton catalyst PB/r GO/PPy powder was synthesized.In 20min,95.2%of methyl orange（MO）was degraded,and the degradation rate k value was 2.51×10^-1 min^-1.The E_a,ΔH,ΔS,andΔG values were 64 k J/mol,63.5 k J/mol,186.5 J/mol K,and 10.72 k J/mol（283 K）,respectively,indicating that the photo-Fenton degradation of MO was an exothermic,unorderly increasing,and nonspontaneous process.Then,on the basis of a porous and water-absorbing PVA,a PB/r GO/PPy/PVA composite hydrogel was prepared,which improved the photothermal conversion ability of the PVA hydrogel and achieved an evaporation rate of 1.62 kg m^-2 h^-1.Through a self-built water treatment device,the PB/r GO/PPy/PVA hydrogel achieved photo Fenton catalytic degradation of organic pollutants in water while collecting clean condensate water,achieving complete removal of pollutants.Chosen PB as the catalytic center,PPy as the photothermal center,and PVA as the base and carrier,a new photothermal catalytic hydrogel material PB/PPy/PVA was synthesized using a one-step method.At p H=5,an addition amount of H₂O₂ of 1.12 mmol/L,the PB/PPy/PVA composite hydrogel could degrade 99.5%of MO in 15 min.The hydrogel material had good photothermal conversion performance,with an evaporation rate of 1.95kg m^-2 h^-1 under a sunlight intensity of 1000 W/m².After 20 cycles of evaporation experiments,the evaporation performance was stable and good.Through a self-built water treatment device,the PB/PPy/PVA hydrogel achieved efficient catalytic degradation of organic pollutants in water while collecting clean condensate water,and it is applicable to multiple dyes such as MO,Rh B,and MB.Prepared using slow-speed paper as the film base,using ultrasound cavitation to deposit Prussian blue nanoparticles on the paper,followed by wet chemistry to deposit polypyrrole on the film,a new photothermal catalytic film PB-PPy-Paper was produced.After 2 h,the film could degrade 99.5%of MO solution.PB-PPy-Paper had good absorptive performance and photothermal conversion ability,and the two-dimensional plane evaporator’s evaporation rate under a sunlight irradiation was 1.58 kg m^-2 h^-1.After 40 cycles,the evaporation rate remained basically unchanged.In studies on solar thermal conversion and photo Fenton treatment of organic pollutants in water,PB-PPy-Paper film effectively prevented volatile pollutants such as benzene from entering the steam condensate water;at the same time,it could degrade pollutants in the source water used for steam condensation while collecting clean condensate water.