【摘要】 当用紫外光辐照在氙气氛中的SO₃^2-水溶液时,加或不加半导体催化剂TiO₂粉末,都能生成SO₄^2-和H₂。加TiO₂的体系:SO₃^2-水溶液的浓度以≤0.2N、pH=8—9时放H₂较多。辐照八小时内H₂的产量随时间增长而级性上升。同时产H₂0.22毫克分子,SO₃^2-的氧化率为20.9％。在上述条件下,不加TiO₂的体系发生了光化学反应,而且效率高于光催化反应。不同pH条件下,无光催化剂,加TiO₂或pt/TiO₂三种体系中,微碱性溶液,以光化学反应效率高。而酸性溶液,pt/TiO₂体系以光催化反应效率高。更多还原

【Abstract】 When UV irradiated to system with aqueous solution of SO32-sealed by Argon,SO42-and H2 can be produced whether the system is in the presence of semiconductor photcatalyst TiO2 powder or not.For systems with TiO2 the hydrogen evolution was more whenever the concentration of SO32-was in ≤0.2N and pH=8-9.In 8 hrs.,the yield of H2 increased linearly with the increase of irradiated time,the total hydrogon amount was 0.22m mol and the total oxidation amount o?SO32-was 20.9% after irradiation.Under the same conditions,the photochemical reaction occurred in systems without TiO2 was more efficient than photocatalytic reacti-on occurred in systems with TiO2,In different pH values and various cases such as no photocatalysts,with TiO2 and with pt/TiO2,proved that photochemical reaction was more efficient in weak basic sol’n and photocatalytic reaction was more ’efficient in acidic sol’n with pt/TiO2.The mechanisms were tentalivety discussed.更多还原