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A combined technique of photo-doping and MOCVD for the development of heterogeneous photo-Fenton catalyst

机译：光掺杂与MOCVD相结合的技术开发非均相光芬顿催化剂

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摘要

A novel technique combining photo-doping and metal-organic chemical vapor deposition (MOCVD) is used to synthesize heterogeneous iron (Fe) catalyst supported on TiO2/SiO2 substrate. The TiO2/SiO2 substrate is obtained through MOCVD method to disperse TiO2 onto silica gel and then iron is coated onto the substrate by photo-doping. The developed catalyst, Fe/TiO2/SiO2. is characterized by various techniques, including ICP-OES, XRD, XPS, and physisorption. It is found that the doped ferric ion is selectively deposited on the TiO2 layer of the catalyst surface without any significant change of the BET specific surface area. XPS spectrum further proves that the doped iron is in trivalent form and mainly distributed on the catalyst surface. The developed catalysts are evaluated in the photo-Fenton degradation on a dye pollutant, Orange II. Complete discoloration and 80% of mineralization can be achieved. A calcination step is required after the photo-doping in order to minimize the iron leaching during the photo-Fenton reaction.
机译：结合光掺杂和金属有机化学气相沉积（MOCVD）的新技术被用来合成负载在TiO2 / SiO2衬底上的多相铁（Fe）催化剂。通过MOCVD法获得TiO 2 / SiO 2基材，将TiO 2分散在硅胶上，然后通过光掺杂将铁涂覆在基材上。开发的催化剂Fe / TiO2 / SiO2。具有多种技术，包括ICP-OES，XRD，XPS和物理吸附。发现掺杂的铁离子选择性地沉积在催化剂表面的TiO 2层上，而BET比表面积没有任何显着变化。 XPS光谱进一步证明了掺杂的铁为三价形式并且主要分布在催化剂表面上。在染料污染物Orange II的光芬顿降解中评估了开发的催化剂。可以实现完全脱色和80％的矿化。在光掺杂之后需要煅烧步骤，以最小化光芬顿反应期间的铁浸出。

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