In this paper,the degradation of an azo dye Orange G (OG) on

In this paper,the degradation of an azo dye Orange G (OG) on nitrogen-doped TiO2 photocatalysts has been investigated under visible light and sunlight irradiation.Under visible light irradiation,the doped TiO2 nanocatalysts demonstrated higher activity than the commercial Dugussa P25 TiO2,allowing more efficient utilization of solar light,while under sunlight,P25 showed higher photocatalytic activity.According to the X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS) and UV–vis spectra analyses,it was found that both the nanosized anatase structure and the appearance of new absorption band in the visible region caused by nitrogen doping were responsible for the significant enhancement of OG degradation under visible light.In addition,the photosensitized oxidation mechanism originated from OG itself was also considered contributing to the higher visible-light-induced degradation efficiency.The effect of the initial pH of the solution and the dosage of hydrogen peroxide under different light sources was also investigated.Under visible light and sunlight,the optimal solution pH was both 2.0,while the optimal dosage of H2O2 was 5.0 and 15.0 mmol/l,respectively.
Azodyes,which are characterized by the presence of one or more azo bonds ( N N ),are among the most notorious widespread environmental pollutants associated with textile,cosmetic,food colorants,printing,and pharmaceutical indus-tries.Because of their non-degradability,toxicity,potential mutagenicity and carcinogenicity,wastewaters originating from these dyes production or application industries pose a major threat to the surrounding ecosystems and human beings’ health.[1–3].Environmental concerns and the need of meeting the strin-gent international standards for rejecting wastewaters has made the development of novel and cost-effective processes for the purification of azo dyes effluents an issue of major technological importance.

在这个文件中,一个偶氮染料橙G（146/03）的氮掺杂TiO2光催化剂降解,研究了在可见光及太阳光照射.在可见光照射下,掺杂TiO2纳米催化剂表现出较高的商业Dugussa比P25的TiO2的,可以更有效的利用太阳光,而阳光下,P25的表现出较高的光催化活性.根据X射线衍射仪（XRD）,X射线光电子能谱（XPS）和紫外可见光谱进行分析,结果发现,无论是纳米锐钛型结构,在可见光区出现新的吸收峰造成的氮掺杂是推动奥运可见光下的降解显着增强责任.此外,光敏氧化机理源于奥运本身也被认为有助于可见光光致降解效率更高.该解决方案的初始pH值和过氧化氢在不同光源剂量效应进行了研究.在可见光及太阳光,最适pH值,既2.0,而过氧化氢的最佳剂量为5.0和15.0毫摩尔/升,分别为.
偶氮染料,这是由一个或多个（尼龙）偶氮键的存在为特征,属于与纺织,化妆品,食品着色剂,印刷相关的最臭名昭著的广泛的环境污染物,制药梧桐,尝试.由于他们的非降解性,毒性,潜在的致突变性和致癌性,从这些染料废水生产或应用行业发起会对周围的生态系统和人类的健康.[1-3].环境问题和满足需求的主要威胁对拒绝废水〜应变-根特国际标准取得了新的和对偶氮染料净化成本效益的污水处理发展的重大技术问题的重要性