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Insights into the mechanism of peroxydisulfate activated by magnetic spinel CuFe2O4/SBC as a heterogeneous catalyst for bisphenol S degradation
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2021-02-28 , DOI: 10.1016/j.cej.2021.129162
Bingyu Wang , Qiaoqiao Li , Ying Lv , Haibin Fu , Dingyi Liu , Yanfang Feng , Huifang Xie , Hongxia Qu

The CuFe2O4 catalyst in advanced oxidation processes had received much attention, while the leaching metal ions and its agglomeration limited its application prospect. The conversion of waste activated sludge (WAS) into sludge-derived biochar (SBC) through pyrolysis could not only be the option of reducing the environmental burden but also converted to be the value-added environmental remediation materials. Hence, the present study prepared as a CuFe2O4/SBC heterogeneous catalyst to degrade new environmental pollutants (bisphenol S, BPS). To our best knowledge, CuFe2O4/SBC as a heterogeneous catalyst activating peroxydisulfate to degrade BPS in solution is rarely reported, and the catalytic performances and degradation mechanism of CuFe2O4/SBC need to be comprehensively investigated. The synergistic effect between CuFe2O4 and SBC enhanced catalytic performances and alleviated agglomeration. The CuFe2O4/SBC was greatly ameliorated metal ions leaching, but the synthetic strategy could better optimize to further reducing Cu ion leaching. The dominant role of heterogeneous catalysis by CuFe2O4/SBC also have been elucidated. It was proposed that radical (radical dotOH and SO4radical dot) and non-radical (1O2) oxidation processes worked together for BPS degradation, but surface-bound radical pathways played more crucial roles. Some intermediate products with higher toxicity may be produced due to the non-completely mineralized, thus future attention should be paid to their environmental risks. Hence, the detoxification efficiency of CuFe2O4/SBC needs to be further strengthened via improving the reaction conditions. Overall, this study provided a new strategy to simultaneously solve the problems of WAS disposal and leaching metal ions of CuFe2O4.



中文翻译:

磁性尖晶石CuFe 2 O 4 / SBC活化的过氧二硫酸盐作为双酚S降解的非均相催化剂的机理的见解

CuFe 2 O 4催化剂在高级氧化过程中受到了广泛的关注,而金属离子的浸出及其团聚限制了其应用前景。通过热解将废活性污泥(WAS)转化为污泥衍生的生物炭(SBC)不仅可以减轻环境负担,还可以转化为增值的环境修复材料。因此,本研究制备了CuFe 2 O 4 / SBC多相催化剂,以降解新的环境污染物(双酚S,BPS)。据我们所知,CuFe 2 O 4/ SBC作为非均相催化剂活化过氧二硫酸盐降解溶液中的BPS的报道很少,需要全面研究CuFe 2 O 4 / SBC的催化性能和降解机理。CuFe 2 O 4和SBC之间的协同作用增强了催化性能并减轻了团聚。CuFe 2 O 4 / SBC可以大大改善金属离子的浸出,但是合成策略可以更好地优化以进一步减少Cu离子的浸出。还已经阐明了CuFe 2 O 4 / SBC的非均相催化作用的主要作用。有人提出自由基(激进点OH和SO 4激进点)和非自由基(1 O 2)氧化过程共同作用导致BPS降解,但表面结合的自由基途径起着更为关键的作用。由于未完全矿化,可能会生产出某些毒性较高的中间产品,因此应注意其环境风险。因此,需要通过改善反应条件来进一步提高CuFe 2 O 4 / SBC的解毒效率。总体而言,这项研究提供了一种新的策略,可以同时解决WAS处理和CuFe 2 O 4的金属离子浸出的问题。

更新日期:2021-03-04
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