Nitrogen Removal via Coupled Ammonia Oxidation and Nitrite Reduction Using Pt/TiO_2 and Photocatalysis

本文采用光催化还原法制备了高活性的载铂二氧化钛光催化剂,并用XRF、TEM、XRD对样品进行了表征,考察了pH值、负载Pt的含量、Fe2+的添加及保护气的种类等反应条件对该催化剂活性的影响。结果表明:硷性条件下利于氨氮、亚硝酸氮的耦合脱氮反应,载铂量0.5%时去除效果最佳,Fe2+的加入利于光催化反应,氮气保护下催化剂反应活性更高。 Pt/TiO2 photocatalyst was prepared using a photocatalytic reduction method and characterized with XRF, TEM and XRD. Effects of factors such as pH, Pt loading, addition of Fe2+ and protection gas on the activity of photocatalyst in nitrogen removal by coupled ammonia oxidation and nitrite reduction were investigated. Results showed that a basic condition was in favor of the coupled ammonia oxidation, nitrite reduction rate. The nitrogen removal rate was the highest with 0.5% Pt loading. Also, the photocatalyst activity was enhanced under protection gas N2 and addition of Fe 2+ increased the activity of photocatalytic reduction of nitrite.