Catalytic Degradation Of CS₂ Via Dielectric Barrier Discharge Induced 185nm UV Light Photolysis Technology The Combined With The Modified Natural Manganese Ore

In this paper,the Bi₂WO₆ or BiVO₄ coated the natural manganese ore?NMO?composite catalysts?Bi₂WO₆/NMO?BiVO₄/NMO?was prepared by hydrothermal method,and the degradation of carbon disulfide via the combination of dielectric barrier discharge plasma?DBD?induced 185 nm UV light photolysis?CDBDP?technology and different catalysts has been investigated at atmospheric pressure and room temperature.X-ray diffraction?XRD?,Brunauer-Emmett-Teller?BET?,X-ray photoelectron spectroscopy?XPS?and scanning electron microscope?SEM?were utilized to characterize the mineral phase and morphology of natural manganese ore and composite catalysts.The CS₂ removal efficiency in different systems has been examined as function of CS₂ initial concentration?gas residence time?input power and relative humidity.In addition,the possible reaction pathways and mechanism were discussed based on the degradation products analysis.The degradation of carbon disulfide via the combination of CDBDP technology and NMO catalyst?CDBDP/NMO?has been investigated at atmospheric pressure and room temperature.The results showed that the CS₂ removal efficiency in all systems increased with the increase of input power and gas residence time,decreased with the increase of CS₂ initial concentration,increased as the relative humidity increased to about 60%,and then decreased when the humidity continue to increase.DBD combined with 185 nm UV light and CDBDP/NMO could improve CS₂ removal efficiency by about 11%and 14%as compared with bare DBD treatment,respectively.When CS₂ initial concentration was 150 mg/m³,RH was 60%,gas flow rate was 0.9 m³/h,and input power of 80 W in CDBDP/NMO system,the mineralization rate of CS₂ increased by 16.3%,while the yield of SO₂ and NO₂decreased by 21.3%and 42.8%,respectively.And the concentration of ozone decreased from 128 mg/m³ to 60mg/m³.The degradation products of CS₂ includes COS?SO₂ and some other secondary pollutants.The degradation of carbon disulfide via the combination of CDBDP technology and Bi₂WO₆/NMO catalyst has been investigated.The results showed that the composite Bi₂WO₆/NMO with the mass ratio of 0.2:1 and the precursor solution pH of 3 and the calcination temperature of 400^oC had the highest catalytic activity.The interaction between Bi₂WO₆ and NMO changed the morphology and species distribution of the catalyst,enhanced the catalytic activity.The order of the degradation rate of CS₂ for each catalyst is:Bi₂WO₆/NMO>NMO>Bi₂WO₆>no catalyst,in accordance with the order of ozone degradation activity.The addition of Bi₂WO₆/NMO synthesized under the optimum conditions could improve CS₂ removal efficiency by 27.2%as compared with bare CDBDP treatment.When CS₂ initial concentration was 150 mg/m³,gas flow rate was 0.9 m³/h,and input power of 80 W in system,the selectivity of CO₂ increased by 25%,while the concentration of ozone decreased by 55.5%.The degradation of carbon disulfide via the combination of CDBDP technology and BiVO₄/NMO catalyst has been investigated.The results showed that the composite BiVO₄/NMO with the mass ratio of 0.2:1 and the precursor solution pH of7 and the calcination temperature of 500^oC had the highest catalytic activity.The interaction between BiVO₄ and NMO changed the morphology and species distribution of the catalyst,enhanced the catalytic activity.The order of the degradation rate of CS₂ for each catalyst is:BiVO₄/NMO>NMO>BiVO₄>no catalyst.The addition of BiVO₄/NMO synthesized under the optimum conditions could improve CS₂ removal efficiency by 28%as compared with bare CDBDP treatment.When CS₂ initial concentration was 150 mg/m³,gas flow rate was 0.9 m³/h,and input power of 80 W in system,the mineralization of CS₂ increased by 28.1%,while the concentration of ozone decreased by 61.1%.