Venkatesan A, Al-Onazi Wedad A, Elshikh Mohamed S, Pham Thi Huong, Suganya S, Boobas S, Priyadharsan A
Department of Physics, Annai College of Arts and Sciences (Affiliated to Bharthidasan University), Trichy, Kovilacheri, Kumbakonam, 612503, Tamilnadu, India.
Department of Chemistry, College of Science, King Saud University, P.O. Box 22452, Riyadh, 11495, Saudi Arabia.
Chemosphere. 2022 Oct;305:135333. doi: 10.1016/j.chemosphere.2022.135333. Epub 2022 Jun 13.
In this work, we reported synthesis of cobalt and carbon codoped TiO (Co-C-TiO) nanoparticles were prepared using co-precipitation technique. The synthesized catalysts are analyzed by various methods. The powder XRD pattern confirmed that all the samples were polycrystalline of anatase phase and particle size of resultant nanoparticle was reduced correlated with bare TiO sample. FTIR measurements exhibit the identification of functional groups present at the surface of TiO. FESEM micrograph showed that the shape of codoped TiO nanoparticles are approximately sphere. The attained energy gap of Co doped and C codoping of TiO modifies to a level below the energy gap of TiO anatase specifying a high capability to absorb visible light. The recombination rate of photo-induced electrons and holes for Co-C codoped TiO nanoparticles is significantly reduced. The synthesized samples are assessed in degradation of phenol by the illumination of visible light. The results confirmed that photocatalytic activity enhanced due to doping and codoping of Co and C. As a result, Co-C codoped TiO nanoparticles exhibited a higher visible-light photocatalytic activity in compared with Co-TiO and bare TiO with the maximum degradation efficiency of 98, 75 and 15%, respectively. And also, the reusability of the catalyst was proved when 95% degradation could be achieved after consecutive batches. It is predictable that this work will provide new insights to increase the visible light active photocatalysts for environmental problems.
在本工作中，我们报道了采用共沉淀技术制备钴和碳共掺杂的TiO（Co-C-TiO）纳米粒子。通过各种方法对合成的催化剂进行了分析。粉末XRD图谱证实所有样品均为锐钛矿相的多晶，且所得纳米粒子的粒径与纯TiO样品相比有所减小。FTIR测量显示了TiO表面存在的官能团的鉴定结果。FESEM显微照片表明共掺杂TiO纳米粒子的形状近似球形。TiO的Co掺杂和C共掺杂所获得的能隙改变到低于TiO锐钛矿的能隙水平，表明具有高的可见光吸收能力。Co-C共掺杂TiO纳米粒子的光生电子和空穴的复合率显著降低。通过可见光照射评估合成样品对苯酚的降解情况。结果证实，由于Co和C的掺杂和共掺杂，光催化活性增强。因此，Co-C共掺杂TiO纳米粒子与Co-TiO和纯TiO相比表现出更高的可见光光催化活性，最大降解效率分别为98%、75%和15%。此外，当连续批次后可实现95%的降解时，证明了催化剂的可重复使用性。可以预见，这项工作将为增加用于环境问题的可见光活性光催化剂提供新的见解。
