| In recent years,China has issued a series of policies,laws and regulations regarding environmental protection and energy,which has placed high demands on the treatment of industrial waste water.Single oxidation technology has its own shortcomings in practical application.Therefore,the development prospect of using two or more technologies to oxidize high-concentration refractory organic waste water is very promising.In the paper,a double-effect catalyst with property of photocatalyst and Fenton high-grade oxidation are made through the transition metal-doped sodium citrate photocatalyst,achieving the photocatalytic-sulfate radical synergistic oxidation.A series of characterization and photodegradation methylene blue experiments showed that 0.442 g?0.001 mol?of Ta2O5 and 9 g?0.225 mol?NaOH were added in a25 mL reactor?75%ultrapure water filling?.hydrothermal reaction at 200?for 24h can produce the best catalytic pure phase NaTaO3.Besides,different concentrations of Co2+and Fe3+were used to dope NaTaO3.The doped samples were less catalyzed by ultraviolet light and natural light,but the rate of degradation of methylene blue was greatly improved by synergy with PMS,and the doping concentration was9%Co2+.The best degradation effect of the powder is close to 100%under ultraviolet light for 30 minutes.The final reproduction experiment showed that the degradation rate decreased slightly after repeated three times,indicating that the reusability of the double-effect catalyst was good;the catalytic mechanism indicates that both·OH and SO4·-exist in the system,of which SO4·-plays a major role.The further degradation of phenol showed that the degradation rate under UV light was 81.7%,and the degradation rate under natural light was 62.6%.It was confirmed that we prepared a catalyst with both photocatalytic properties and advanced oxidation of sulfate radicals and synergistic oxidation of photocatalytic-sulfate free radicals is achieved. |
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