期刊
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
卷 25, 期 30, 页码 30575-30584出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-2974-2
关键词
Nitrogen-doped graphene oxide; Magnetic nanoparticles; Sulfate radical; Wastewater treatment; Advanced oxidation technology
资金
- National Natural Science Foundation of China [51409024, 51579096, 51404041]
- Natural Science Foundation of Hu Nan China [2017JJ3341]
- science and technology project of Changsha China [ZD1601017, ZD1601058]
A heterogeneous catalyst (M-N-rGO) composed of stability enhanced magnetic iron oxide nanoparticles and nitrogen-doped reduced graphene oxide was synthesized and characterized by SEM, XRD, BET, and XPS. It showed excellent catalytic degradation properties in advanced oxidation technology. In the presence of 200mg/L catalyst and 135mg/L persulfate at pH5, 95% of 10-20mg/L methylene blue could be degraded in 90min with the TOC removal efficiency of 50%. The rate constant based on pseudo-first-order kinetics ranged from 0.0227 to 0.0488/min in the temperature range of 15 to 32 degrees C, and the activation energy was 32.5kJ/mol. Under the optimal operation conditions, 20mg/L of 2,4-dichlorophneol (2,4-DCP) could be removed almost completely. EPR analysis showed that sulfate and hydroxyl radicals were responsible for degradation of pollutants, and radical quenching experiments indicated that nonradical pathway also played a role in pollutant removal. And a mechanism for M-N-rGO and persulfate system was elucidated. This catalyst was easy for preparation, low-cost, highly effective, convenient for separation, and could be used effectively for four times through 0.1mol/L H2SO4 regeneration. It provided a choice for wastewater treatment in practice.
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