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TiO2 nanodots anchored on nitrogen-doped carbon nanotubes encapsulated cobalt nanoparticles as photocatalysts with photo-enhanced catalytic activity towards the pollutant removal

Li, Xiao, Yu, Jiayuan, Li, Guixiang, Liu, Hui, Wang, Aili, Yang, Linjing, Zhou, Weijia, Chu, Benli, Liu, Shengwei
Journal of colloid and interface science 2018 v.526 pp. 158-166
adsorption, carbon, carbon nanotubes, catalytic activity, cobalt, dyes, electrons, encapsulation, free radicals, irradiation, nanoparticles, photocatalysts, pollutants, pyrolysis, sewage treatment, titanium dioxide
Constructing hierarchical structure is an effective approach to improve the activities of catalysts. Herein, a novel hierarchical structure of TiO2 nanodots anchored on N-doped carbon nanotubes encapsulated Co nanoparticles (TiO2/Co@NCT) was synthesized by a simple pyrolysis method. Their catalytic performances were examined in the oxidative and light-assisted degradation of recalcitrant pollutants in the presence of the peroxymonosulfate (PMS). The Orange II removal efficiency within 15 min reached about 98.48% in TiO2/Co@NCT/PMS system. In this system, Co⁰ is used to react with PMS to generate free radicals for the degradation of dyes. The carbon shell benefits the adsorption of dyes and prevents the catalysts from dissolving in the solution. Besides, under light irradiation, TiO2 nanodots can be excited to generate photo-induced electrons, which can reduce inner Co²⁺ to Co⁰ in the degradation process, thus TiO2/Co@NCT exhabited high activity and outstanding stability in degradation process. The as-prepared TiO2/Co@NCT catalyst showed efficient degradation and superior stability, which would make it a great promise in practical applications for sewage treatment.