From aquatic biota to autogenous N-doping biochar—using a highly efficient nonradical dominant process for sulfamethoxazole degradation
Journal of Cleaner Production(2022)
摘要
Biochar has been considered as a promising environmental-friendly catalyst to activate peroxydisulfate (PDS) for contaminant degradation. In this study, a series of autogenous N-rich biochar derived from Spirulina were prepared by K2CO3 impregnation (NPSBs). The pyrolysis temperature and the rational design of morphology by K2CO3 had a significant influence on the performance of NPSBs to activate PDS. The NPSB-700 was capable of degrading 97.59% sulfamethoxazole (SMX) within 40 min because of the high surface area, high defect degree, and good electrical conductivity. The accelerated electron transfer and the generation of O-1(2) were elucidated to be the dominant pathways for SMX degradation. It has been proven that this is a process of reducing toxicity. Furthermore, NPSB-700 also showed excellent degradation performance to various pollutants. This study provides a facile modification strategy of Spirulina-based catalysts and deepens the comprehension of persulfate activation via nonradical oxidation.
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关键词
Spirulina-based biochar, Catalytic degradation, Peroxydisulfate, Nonradical pathway, Water treatment, N-doping
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