Biochar plays multiple roles in BPA/persulfate degradation system

文献类型： 外文期刊

第一作者： Yi, Xing

作者： Yi, Xing;Chen, Xiao;Jiang, Shaojun;Shu, Yuehong;Jiang, Shaojun

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关键词： Biochar; Organic matter; Persulfate; Bisphenol A; Advanced oxidation

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：7.2； 五年影响因子：7.6 ）

ISSN： 2213-2929

年卷期： 2025 年 13 卷 3 期

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收录情况： SCI

摘要： Biochar is widely used as a persulfate (PS) activator for degrading organic pollutants in advanced oxidation processes (AOPs). However, apart from a catalyst for PS activation, biochar, as organic matter (OM) itself, its role as a degraded target as well as a sorbent for target pollutants in biochar/PS systems requires further clarification. The bulk biochar (BC), biochar-derived dissolved organic matter (BDOM) and biochar-derived particulate organic matter (BPOM) were prepared at 300 degrees C, 500 degrees C, and 800 degrees C and well characterized to evaluate their efficacy of sorption and activation capacity, as well as their potential for PS consumption. The results showed that biochar and its derivatives exhibited the best degradation efficacy at pyrolysis temperature of 800 degrees C. With DOM removed, 800BPOM showed higher BPA removal rate (97.5 %) as compared with 800BC (84.8 %) in the pre-sorption/degradation systems, owning to the superior sorption and activation capacity. Moreover, less 800BPOM (13.2 %) was degraded by PS as compared with 800BC (17.4 %), which was also attributed to the removed DOM. Although 800BDOM could also activate PS and degrade BPA with 26.6 % of removal rate, 50 % of 800BDOM itself was degraded by PS and led to the unnecessary PS consumption. Quenching experiments, electron spin resonance (EPR), and surface functional group analysis indicated that radical pathway (mainly center dot OH) and non-radical pathway (1O2 and graphite carbon) together contributed to BPA degradation in 800BPOM/ PS and 800BC/PS systems. The results can potentially provide insights in biochar activated PS-AOPs for organics degradation.

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