期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 740, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2020.140388
关键词
Biochar; Oxygen vacancy; Peroxymonosulfate; Red mud; Sewage sludge; Sulfamethoxazole
资金
- National Key Research and Development Program of China [2018YFC1901403]
- National Natural Science Foundation of China [21671072]
- Fundamental Research Funds for the Central Universities [2019kfyRCPY058]
- Chutian Scholar Foundation from Hubei province
In this paper, red mud-sewage sludge derived biochar (RSDBC) was synthesized and employed as the heterogenous activator of peroxymonosulfate (PMS) for sulfamethoxazole (SMX) degradation. With the incorporation of red mud, 825% degradation of SMX was achieved by RSDBC/PMS system in a process dominated by O-1(2), which was attributed to the participation of oxygen vacancy, ketone groups and graphitic carbon. On the other hand, in the absence of red mud, center dot OH and SO4 center dot- were dominantly accounted for SMX degradation in sewage sludge derived biochar (SDBC)/PMS system. In this case heterogeneous Fe species, ketone groups and graphitic carbon were responsible for PMS activation. Due to the different Reactive Oxygen Species (ROS), effects of reaction conditions including initial pH, common anions and natural organic matter (NOM) were not in full accord. Besides, Fe leaching from RSDBC (0.67 ppm) was much lower than that of SDBC (3.07 ppm), leading to a better reuse ability for RSDBC. Less degradation intermediates were disclosed in RSDBC/PMS system, along with lower residual toxicity. In addition, eco-toxicity of all the intermediates was predicted by ECOSAR program for the further understanding of the detoxification of SMX. Advantages of RSDBC/PMS system as disclosed in this paper further suggest its potential full-scale application of environmental remediation. (C) 2020 Elsevier B.V. All rights reserved.
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