当前位置: X-MOL 学术J. Nanophotonics › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Sol–gel synthesized ZnO/Mn–TiO2 core–shell nanocomposite and its elevated activity for methyl orange degradation
Journal of Nanophotonics ( IF 1.5 ) Pub Date : 2020-09-14 , DOI: 10.1117/1.jnp.14.036015
Mohammad R. D. Khaki 1 , Mohammad S. Shafeeyan 1
Affiliation  

Abstract. Photocatalysis is a new advanced oxidation process based on the irradiation of semiconductors such as TiO2 and ZnO for photodegradation of contaminants. In this process, the semiconductor absorbs the photon energy of ultraviolet radiation, generating highly reactive species for the degradation of organic compounds. It has been reported that doping of transition metals (e.g., Cu, Ni, Co, and Mn) into the structure of oxide semiconductors can reduce the band gap and expand their adsorption properties to the visible solar spectrum. Accordingly, a new hybrid photocatalyst of Mn-doped TiO2 / ZnO with an Mn content of 1 to 5 wt. % was synthesized via the sol–gel process followed by thermal calcinations in air at 500°C. The prepared photocatalyst powder was characterized in terms of crystalline structure, thermal property, surface morphology, and band gap energy level. Its photocatalytic performance was then assessed based on photodegradation of methylene orange under visible light irradiation. Compared with the pure TiO2 / ZnO, the lattice of Mn-doped TiO2 / ZnO was found to be more thermally stable, and thus phase transformation of anatase to rutile was postponed to a higher calcination temperature. The photocatalysis evaluation showed an increased activity of Mn–ZnO / TiO2 compared with pure TiO2 and TiO2 / ZnO under visible light irradiation. Accordingly, the highest degradation of 98% was obtained by the Mn–ZnO / TiO2 with 3 wt. % Mn.

中文翻译:

溶胶-凝胶合成 ZnO/Mn-TiO2 核壳纳米复合材料及其提高的甲基橙降解活性

摘要。光催化是一种新的高级氧化工艺,它基于对 TiO2 和 ZnO 等半导体的照射,用于光降解污染物。在这个过程中,半导体吸收紫外线辐射的光子能量,产生用于降解有机化合物的高活性物种。据报道,将过渡金属(例如,Cu、Ni、Co 和 Mn)掺杂到氧化物半导体的结构中可以减小带隙并将其吸附性能扩展到可见光太阳光谱。因此,一种新型的 Mn 掺杂 TiO2 / ZnO 混合光催化剂,其 Mn 含量为 1 至 5 重量%。% 是通过溶胶-凝胶工艺合成的,然后在空气中在 500°C 下热煅烧。制备的光催化剂粉末在晶体结构、热性能、表面形貌、和带隙能级。然后基于可见光照射下亚甲基橙的光降解来评估其光催化性能。与纯 TiO2 / ZnO 相比,发现 Mn 掺杂的 TiO2 / ZnO 的晶格更热稳定,因此锐钛矿到金红石的相变推迟到更高的煅烧温度。光催化评估表明,在可见光照射下,与纯 TiO2 和 TiO2/ZnO 相比,Mn-ZnO/TiO2 的活性增加。因此,Mn-ZnO / TiO2 的降解率最高,为 98%。% 锰。发现 Mn 掺杂的 TiO2 / ZnO 的晶格更热稳定,因此锐钛矿到金红石的相变被推迟到更高的煅烧温度。光催化评估表明,在可见光照射下,与纯 TiO2 和 TiO2/ZnO 相比,Mn-ZnO/TiO2 的活性增加。因此,Mn-ZnO / TiO2 的降解率最高,为 98%。% 锰。发现 Mn 掺杂的 TiO2 / ZnO 的晶格更热稳定,因此锐钛矿到金红石的相变被推迟到更高的煅烧温度。光催化评估表明,在可见光照射下,与纯 TiO2 和 TiO2/ZnO 相比,Mn-ZnO/TiO2 的活性增加。因此,Mn-ZnO / TiO2 的降解率最高,为 98%。% 锰。
更新日期:2020-09-14
down
wechat
bug