期刊
CHEMICAL ENGINEERING JOURNAL
卷 354, 期 -, 页码 856-865出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.08.098
关键词
Sulfate radicals; Antibiotics; Mesoporous; Oxygen vacancy; Oxygen-containing groups
资金
- National Natural Science Foundation of China [51608274]
- National Science and Technology Major Project [2017ZX07204001-06]
- Research Foundation of Jiangsu Environmental Protection Department [2017002]
- Fundamental Research Funds for the Central Universities [KYZ 201619, KJQN 201749]
Extraordinary activation of peroxymonosulfate (PMS) was achieved by Co3O4 fabricated with assistance of rice straw derived biochar (BC-Co3O4). The introduction of biochar significantly improved the specific surface area (from 37.0 to 62.7 m(2)/g). The BC-Co3O4/PMS system showed an excellent performance for the degradation of antibiotics (ofloxacin, OFX in this case). The evolution of radical species was monitored with electron paramagnetic resonance (EPR) technique. Both SO4 center dot- and (OH)-O-center dot contributed to the degradation process and the latter one played a major role. The radicals were mainly generated through heterogeneous mechanism rather than homogeneous process. The effects of experimental conditions (initial pH value, dose of PMS, naturally occurring inorganic anions) on the degradation process were systematically investigated. Eventually, the X-ray photoelectron spectroscopy (XPS) results suggested that the large amounts of Co-OH groups on BC-Co3O4 might be the reason of the extraordinary activity. The findings obtained from this study might be meaningful to enlarge the applications of biochar.
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