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BCOFGs loaded with nano-FexSy for the catalytic degradation of QNC: Contribution and mechanism of OFGs for reductive iron regeneration
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2022-08-12 , DOI: 10.1016/j.jhazmat.2022.129741
Wenbin Gao 1 , Yuzhen Chen 1 , Jiahao Rao 1 , Zhan Hu 1 , Yan Tan 2 , Yujiao Wen 2 , Yifan Wang 1 , Zhi Zhou 3 , Yongfa Zhu 4 , Nan Zhou 3
Affiliation  

Biochar currently served as the support for dispersed metal nanoparticles and cooperated with pyrite to generate more reactive radicals in organic pollution degradation system. But the mechanism of interaction between biochar and pyrite has not been elucidated. In this paper, biochar with oxygen-containing functional groups (OFGs) served as a stable dispersant to prepare nano-FexSy loaded biochar materials (BCOFGs@nano-FexSy). BCOFGs coordinated with nano-FexSy to overcome its drawbacks, boosting QNC removal efficiency from 28.64% to 100%. The XPS and the linear sweep voltammetry (LSV) results revealed higher Fe(II) content and higher electron transfer rate on used BCOFGs@nano-FexSy, further validating that hydroxyl functional groups on biochar surface provided electrons to Fe(III) to achieve efficient Fe(II)/Fe(III) cycling. Based on comparative experiments and studies on the roles of iron, S(II) species and OFGs, we clearly revealed that OFGs on biochar materials surface coordinated with nano-FexSy to catalyze the degradation of QNC. The degradation efficiency of BCOFGs@nano-FexSy for QNC was still as high as 91.39% after five cycles, providing full demonstrations that OFGs and S(II) as the abundant electron donor coordinated with Fe species for QNC catalytic degradation and further enhanced the catalytic performance and stability of nano-FexSy.



中文翻译:

负载纳米 FexSy 的 BCOFGs 用于 QNC 催化降解:OFGs 对还原铁再生的贡献和机制

生物炭目前作为分散金属纳米粒子的载体,与黄铁矿配合,在有机污染降解系统中产生更多的活性自由基。但生物炭与黄铁矿相互作用的机制尚未阐明。在本文中,具有含氧官能团的生物炭(OFGs)作为一种稳定的分散剂来制备纳米Fe x S y负载生物炭材料(BC OFGs @nano-Fe x S y)。BC OFGs与 nano-Fe x S y协调为了克服其缺点,将 QNC 去除效率从 28.64% 提高到 100%。XPS 和线性扫描伏安法 (LSV) 结果显示,在使用过的 BC OFG @nano-Fe x S y上, Fe(II) 含量和电子转移率更高,进一步验证了生物炭表面上的羟基官能团为 Fe(III) 提供了电子) 以实现高效的 Fe(II)/Fe(III) 循环。基于对铁、S(II)物种和OFGs作用的比较实验和研究,我们清楚地揭示了生物炭材料表面的OFGs与纳米Fe x S y协同催化QNC的降解。BC OFGs @nano-Fe x S y的降解效率五次循环后 QNC 的催化降解率仍高达 91.39%,充分证明 OFGs 和 S(II) 作为丰富的电子供体与 Fe 物种配位用于 QNC 催化降解,进一步提高了纳米 Fe x S的催化性能和稳定性的。

更新日期:2022-08-17
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