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光催化技术由于反应条件温和,适宜于降解汽车内部的有机挥发性物质(VOCs).为了提高可见光的利用率和自然光照下对VOCs的光催化降解速率,本文采用阳极氧化法+电沉积法制备了掺杂Cu2O的复合钛纳米管阵列(TNAs),并对其进行了SEM、EDX、XRD及UV-Vis表征.结果表明,Cu2O纳米颗粒均布于TNAs的管壁及表层,复合纳米管阵列对可见光的吸收较纯TNAs提高了.通过反应动力学分析发现,Cu2O和O2对TNAs光催化降解VOCs有协同作用,Cu2O/TNAs对VOCs的光催化降解服从一阶反应动力学.研究了反应温度、反应气体中氧含量、催化剂Cu含量及相对湿度对VOCs降解速率常数的影响,拟合了光催化降解VOCs的速率常数函数式,由模型得出,Cu2O/TNAs含Cu量为31.37%,被处理气体中含氧量为36.92%,相对湿度为33.71%时,速率常数最大.建立并验证了VOCs一阶降解模型,模型值与实测值的误差小于20%.
Due to the mild reaction conditions, photocatalytic technology is suitable for the degradation of organic volatile compounds (VOCs) in automobiles.In order to improve the utilization of visible light and the photocatalytic degradation rate of VOCs in natural light, anodic oxidation and electrodeposition The Cu2O-doped composite titanium nanotube arrays (TNAs) were synthesized and characterized by SEM, EDX, XRD and UV-Vis. The results showed that Cu2O nanoparticles were uniformly distributed on the TNAs’ The absorption of visible light is higher than that of pure TNAs.Through the reaction kinetics analysis, Cu2O and O2 have synergistic effect on the photocatalytic degradation of VOCs by TNAs, and the first-order kinetics of photocatalytic degradation of VOCs by Cu2O / TNAs are studied. The effects of reaction temperature , The content of oxygen in the reaction gas, the content of Cu in the catalyst and the relative humidity on the degradation rate constants of VOCs, the rate constant function formula of photocatalytic degradation of VOCs was fitted. According to the model, the content of Cu in Cu2O / TNAs was 31.37% When the oxygen content in the treatment gas is 36.92% and the relative humidity is 33.71%, the rate constant is the highest. The first order degradation model of VOCs is established and validated. The error between the model value and the measured value is less than 20%.