One-step fabrication of cobalt-embedded carbon nitride as a magnetic and efficient heterogeneous catalyst for activating Oxone to degrade dye pollutants in water

• Main Authors: Ming-Tong Yang, 楊明通
• Other Authors: Kun-Yi Lin
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22107NCHU5087035%22.&searchmode=basic

碩士 === 國立中興大學 === 環境工程學系所 === 107 === Cobalt nanoparticles (Co NPs) immobilized on N-doped carbonaceous substrates are attractive heterogeneous catalyst for activating Oxone to degrade pollutants. However, conventional preparation of Co NPs/N-doped carbon composites involves multi-step syntheses of N-doped carbon substrates, and then immobilization of Co NPs on substrates which are complicated and time-consuming. In this study, a convenient one-step fabrication technique is developed for preparing a composite of Co/N-doped carbon via carbonization of a mixture of melamine and cobalt acetate. The resulting Co@CN is comprised of Co NPs evenly distributed over a carbon nitride (CN) matrix. Co@CN could exhibit porous structures and magnetic controllability, making it an appealing catalyst for Oxone activation. Catalytic activities for Oxone activation by Co@CN are investigated via batch-type degradation experiments of amaranth (AMR) dye. In comparison to the other reported catalysts, Co@CN demonstrates the much lower activation energy for AMR degradation. The mechanism of AMR degradation by Co@CN-activated Oxone is also determined by investigating Electron paramagnetic resonance (EPR) analysis and effects of radical inhibitors on AMR degradation. These comparisons indicate the promising features of Co@CN as a heterogeneous catalyst for activating Oxone. The synthesis technique proposed here can be also adopted to develop similar composites of metallic NPs distributed over CN matrices for various catalytic applications.