Photocatalytic degradation of aqueous Methyl Orange using nitrogen-doped TiO2 photocatalyst prepared

• 作 者: Mohsen Nasirian Mehrab Mehrvar
• 机 构: Graduate Programs in Environmental Applied Science and Management, Ryerson University, Toronto, ON M
• 出 处: 环境科学学报（英文版）
• 发表日期: 2018年4期
• 关键词: Ultraviolet-assisted thermal synthesis N-TiO2 Photocatalysis Advanced oxidation

A nitrogen-doped titanium dioxide composite photocatalyst (N-TiO2) with heterojunction structures is synthesized by three different approaches:a novel UV-assisted thermal synthesis,annealing,and microwave technique.Photocatalytic activities of synthesized photocatalysts are evaluated by the degradation of Methyl Orange under ultraviolet light types A (UV-A),B (UV-B),and C (UV-C),visible light,and direct sunlight irradiation.Results show that by using N-TiO2 photocatalyst prepared by the UV-assisted thermal synthesis and annealing,the degradation increases by 16.5％ and 20.4％,respectively,compared to that by bare TiO2.The best results are obtained at a nitrogen to TiO2 mass ratio of 0.15 (N:TiO2).The enhancement of the photocatalytic activity observed in the visible range is mainly attributed to the increasing separation rate of photogenerated charge carriers.The novel UV-assisted thermal synthesis has produced encouraging results as a preparation method for the nitrogen-doped TiO2 photocatalyst;thus,further studies are recommended for process optimization,immobilization,and scale-up to evaluate its applicability in wastewater treatment.