期刊
RSC ADVANCES
卷 6, 期 42, 页码 35568-35576出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra02911f
关键词
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资金
- National Natural Science Foundation of China [21571140, 21531005, 21371134]
- 973 Program [2014CB845601]
- Program for Innovative Research Team in University of Tianjin [TD12-5038]
- Doctoral Program Foundation of Tianjin Normal University [52XB1508]
Cobalt-doped graphitic carbon nitride (Co-g-C3N4) materials with different cobalt contents were prepared by a facile one-pot thermal condensation method with urea and cobalt chloride. The morphology and composition of the synthesized products were characterized by different techniques. X-ray photoelectron spectroscopy and elemental mappings revealed that cobalt element is highly dispersed in the framework of g-C3N4. For the first time, Co-g-C3N4 was demonstrated to own dramatically enhanced peroxidase-like activity, compared with pure g-C3N4. Its activity is dependent on the content of cobalt doping, and the optimal content is 2.5% (Co-g-C3N4-2) based on the result of inductively coupled plasma atomic emission spectroscopy. The catalytic kinetics reveals that Co-g-C3N4-2 has a higher affinity for the substrate 3,30,5,50-tetramethylbenzidine (TMB) and similarly efficient performance in comparison to that of natural peroxidase. The proposed mechanism demonstrates that cobalt dopant facilitates the electron transfer of Co-g-C3N4 from TMB to H2O2, thus enhances its peroxidase-like activity. Based on the greatly enhanced peroxidase-like activity, Co-g-C3N4-2 is firstly used for wastewater treatment. With rhodamine B as a model, Co-g-C3N4-2 exhibits 11 times higher degradation rate than that of pure g-C3N4. This research will be helpful to improve the development of efficient artificial peroxidase mimic for removing contaminants from wastewater.
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