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在确定的温度和光照条件下,采用中心组合设计法研究了固相反应法合成的硫与铬共掺杂二氧化钛(S-Cr-TiO)2光催化剂与水溶苯胺蓝(ANB)可见光降解过程中的三个作用因子:催化剂的浓度、水溶苯胺蓝水溶液的pH值及其初始浓度之间的相互作用关系,得到了影响因子与降解速率之间的回归方程及因素之间相互作用的响应面图。结果表明,S-Cr-TiO2光催化剂对水溶苯胺蓝的可见光降解过程遵循一级反应动力学规律。当催化剂浓度为2.05g/L,水溶苯胺蓝的浓度为42.57mg/L、pH=6.63时,光降解速率常数为0.01432 min-1,比未优化工艺条件时所得光降解反应速率常数0.01348min-1提高了6.2%。中心组合设计对筛选光降解工艺条件,提高光降解效率是十分有效的。
The central composite design method was used to study the photocatalytic degradation of S-Cr-TiO 2 photocatalysts and aqueous aniline blue (ANB) synthesized by the solid-state reaction under visible light irradiation under certain temperature and light conditions. The interaction between the factors and the reaction factors was obtained by the interaction between the concentration of catalyst and the pH value of aqueous aniline blue solution and its initial concentration. . The results showed that the visible light degradation process of aqueous aniline blue followed the first-order kinetics of S-Cr-TiO2 photocatalyst. The photodegradation rate constant was 0.01432 min-1 when the catalyst concentration was 2.05 g / L, the concentration of water-soluble aniline blue was 42.57 mg / L and pH = 6.63, the photodegradation reaction rate constant was 0.01348 min- 1 increased by 6.2%. Central composite design for screening photodegradation process conditions, improve photodegradation efficiency is very effective.