期刊
CHEMICAL ENGINEERING JOURNAL
卷 435, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135189
关键词
Bimetallic biochar; Peroxydisulfate activation; Nonradical pathway; Nontoxic intermediates
资金
- National Key Research and Devel-opment Program of China [2019YFC1904501]
A new bimetallic biochar (Cr-Fe/BC) was synthesized to induce the nonradical pathway in peroxydisulfate (PDS) activation. This method effectively avoids the generation of harmful intermediates in the degradation process of organic contaminants and demonstrates good removal efficiency and anti-interference capability.
The nonradical pathway in peroxydisulfate (PDS) activation for refractory contaminant removal has attracted increasing attention due to its inherent advantages. Hence, a new bimetallic biochar (Cr-Fe/BC) was synthesized via pyrolysis by using chrome shaving and ferric sulfate as the raw materials. Results illustrated that tetracycline (TC) could been completely removed in a small amount of Cr-Fe/BC (0.03 g/L) and PDS (2 mM) within 60 min with a high mineralization rate (82%). Besides, the Cr-Fe/BC/PDS system exhibited a strong anti-interference capability for coexisting organics and inorganics in water. Based on the results of various spectroscopic evidences and DFT calculations, iron introduction successfully transformed the free radical degradation process that was dominated by sulfate radicals (SO4 & BULL;-) into the nonradical degradation process that was dominated by electron transfer. The tunning mechanism of the free radical/nonradical pathway was connected to the increased pi-electrons flow in sp(2)-carbon by conjugation after the iron introduction. Meanwhile, ecotoxicological safety of TC intermediates identified to validate the superiority of the nonradical process. In this work, a new method for inducing nonradical pathway was provided in the process of PDS activation, which effectively avoided harmful intermediates generation in the process of organic contaminants degradation.
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