UV/Ce³⁺ Kinetics And Mechanism Of Reactive Red X-3B Synergistic Catalytic Oxidative Degradation H₂O₂/O₃

The printing and dyeing wastewater takes a large proportion of industrywastewater in China, and because of its characteristics, such as large water volume,high concentration organic pollutant, deep chromaticity, high alkalinity, changeablewater quality and complex ingredient, it is difficulty to treat, and the decolorizationand mineralization is a major problem in the printing and dyeing wastewater. Inrecent years, due to the development of the textile industry, printing and dyeingwastewater treatment is gradually increasing urgent. Meanwhile, in order to relievethe pressure of water environment caused by printing and dyeing wastewater, stateand local governments have also established more strict emission standard. It isessential to search for a high-performance physico-chemical treatment method fordyeing wastewater.Facing increasingly serious water pollution, the most commonly used methodfor biological wastewater treatment method is biologically degradable poor,handling molecular weight from thousands to10,000is more difficult, but physicaland chemical oxidation or by direct mineralization oxidation improvebiodegradability of pollutants, but also for addressing environmental hormones andother harmful chemicals has a great advantage. However, a single O3, H2O2andother oxidants Cl2has many shortcomings, such as low oxidative decompositionefficiency, selectivity. Multiple research methods are synergistic catalytic oxidizerdirection catalytic oxidative degradation of various dye wastewater sought after bymany scholarsReferring to previous research literature, for bleaching and dyeing wastewatermineralization this problem, this paper Ce3+catalysis under UV irradiation as acatalyst to produce hydroxyl radicals H2O2/O3simulated dyeing wastewater reactivered X-3B solution conducted oxidative degradation. And by Ce3+under ultraviolet(UV) light catalytic effect on the generation of strong oxidants H2O2/O3degradationof reactive red X-3B were studied. First experiments investigated the catalytic effectof Ce3+system reaction experimentally determined the optimal reaction conditions; Secondly, the kinetics of the reaction system under the optimal reactionconditions; Finally, the mechanism of degradation and degradation intermediateproducts a discussion of research.The results showed that:(1)Reactive red X-3B in UV/Ce3+-H2O2/O3, UV/H2O2/O3, UV/Ce3+,Ce3+/H2O2/O3,H2O2/O3, Ce3+system response, found in UV/Ce3+-H2O2/O3system active red X-3Bdegradation rate than the other five systems reactive red X-3B degradation rate isfaster, indicating that Ce3+in the system are able to catalyze the degradation ofreactive brilliant red X-3B.(2)UV/Ce3+synergistic catalytic H2O2/O3oxidative degradation of reactive brilliantred X-3B reaction conditions:Ce3+dosage1mmol, H2O2dosage of10mmol, pHvalues of6, O3inlet concentration1.6L/mim, this time reactive red X-3B degradationrate of99.9%...