In this paper, photocatalytic degradation of commercial textile azo dyes catalyzed by titanium dioxide and modified titanium dioxide with Ag metal (1% w/w) in aqueous solution under irradiation with a 400 W high-pressure mercury lamp is reported. The effect of various parameters such as irradiation time of UV light, amount of photocatalyst, flow rate of oxygen, pH and temperature for the Ag-TiO₂ photocatalyst were investigated. Kinetic investigations of photodegradation indicated that reactions obey improved Langmuir-Hinshelwood model and pseudo-first-order law. The rate constant studies of photocatalytic degradation reactions for Ag-TiO₂ and TiO₂ photocatalysts indicated that in all cases the rate constant of the reaction for Ag-TiO₂ was higher than that of TiO₂.

中文翻译：

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Ag掺杂的TiO 2光催化剂对偶氮染料的光催化降解

本文报道了在400 W高压汞灯的照射下，二氧化钛和改性的二氧化钛与Ag金属（1％w / w）在水溶液中的光催化降解工业纺织品偶氮染料的行为。研究了Ag-TiO ₂光催化剂的紫外线照射时间，光催化剂用量，氧气流量，pH值和温度等各种参数的影响。光降解的动力学研究表明，反应服从改进的Langmuir-Hinshelwood模型和伪一阶定律。Ag-TiO ₂和TiO ₂光催化剂的光催化降解反应的速率常数研究表明，在所有情况下，Ag-TiO ₂的反应速率常数比TiO _2高。