| Photocatalytic oxidation of SO2 and NOx in flue gas is a new type of simultaneous desulfurization and denitration technology,which can simultaneously remove multiple pollutions on the same equipment.Moreover,it has the advantages of resource utilization,low pollution and small floor space,and has become a research hotspot in the field of flue gas desulfurization and denitrification.In this paper,graphene oxide/nanocomposites were used as catalysts to investigate the desulfurization and denitrification performance of simulated flue gas in photocatalytic reactors.The paper briefly summarizes the domestic and international application status of photocatalytic desulfurization and denitrification.On the self-built experimental platform,the photocatalytic activity of graphene was first tested.The effect of dosage,pH and initial concentration on the photocatalytic degradation of methylene blue by graphene was studied by using ultraviolet light as the light source.On this basis,the method was adopted.Design expert software was used to study the effects of temperature,oxygen content,sulfur dioxide concentration and NO on the desulfurization and denitrification performance of graphene oxide/nanocomposites.The optimal process conditions for Box-Behnken response surface analysis were:Desulfurization:temperature 46.48°C,oxygen content 4.08%,sulfur dioxide concentration 1873.35 mg/m3;separate denitration:temperature 47.82°C,oxygen content 8.25%,NO concentration 282.42 mg/m3.Finally,this paper designed and carried out simultaneous desulfurization and denitrification experiments by design expert software.The interaction between SO2 and NOx in the simultaneous desulfurization and denitrification process was discussed by response surface analysis.The optimal conditions for simultaneous removal experiments were:temperature 42.43°C.The oxygen content is 11.97%,the sulfur dioxide concentration is 1802.46 mg/m3,and the NO concentration is 377.34 mg/m3. |
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