Prussian blue analogue derived magnetic carbon/cobalt/iron nanocomposite as an efficient and recyclable catalyst for activation of peroxymonosulfate.
A Prussian blue analogue, cobalt hexacyanoferrate Co3[Fe(CN)6]2, was used for the first time to prepare a magnetic carbon/cobalt/iron (MCCI) nanocomposite via one-step carbonization of Co3[Fe(CN)6]2. The resulting MCCI consisted of evenly-distributed cobalt and cobalt ferrite in a porous carbonaceous matrix, making it an attractive magnetic heterogeneous catalyst for activating peroxymonosulfate (PMS). As Rhodamine B (RhB) degradation was adopted as a model test for evaluating activation capability of MCCI, factors influencing RhB degradation were thoroughly examined, including MCCI and PMS dosages, temperature, pH, salt and radical scavengers. A higher MCCI dosage noticeably facilitated the degradation kinetics, whereas insufficient PMS dosage led to ineffective degradation. RhB degradation by MCCI-activated PMS was much more favorable at high temperatures and under neutral conditions. The presence of high concentration of salt slightly interfered with RhB degradation by MCCI-activated PMS. Through examining effects of radical scavengers, RhB degradation by MCCI-activated PMS can be primarily attributed to sulfate radicals instead of a combination of sulfate and hydroxyl radicals. Compared to Co3O4, a typical catalyst for PMS activation, MCCI also exhibited a higher catalytic activity for activating PMS. In addition, MCCI was proven as a durable and recyclable catalyst for activating PMS over multiple cycles without efficiency loss and significant changes of chemical characteristics. These features demonstrate that MCCI, simply prepared from a one-step carbonization of Co3[Fe(CN)6]2is a promising heterogeneous catalyst for activating PMS to degrade organic pollutants.
Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan. Electronic address: linky@nchu.edu.tw.
Kun-Yi Andrew
KA
Lin
Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan.
Bo-Jau
BJ
Chen
D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D003035:Cobalt / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry; D005295:Ferrocyanides / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D059346:Magnets / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry*; D010545:Peroxides / Q000737:chemistry*; D059027:Recycling; D012235:Rhodamines / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry
D005290:Ferric Compounds; D005295:Ferrocyanides; D010545:Peroxides; D012235:Rhodamines; D014874:Water Pollutants, Chemical; C569492:cobalt ferrite; C038288:peroxymonosulfate; D003035:Cobalt; D002244:Carbon; D007501:Iron; C029773:rhodamine B; C000170:ferric ferrocyanide
Carbon; Cobalt; Cobalt hexacyanoferrate; Iron; Peroxymonosulfate; Prussian blue analogue