Wang Yangyang, Xu Jianfeng, Wang Xiaoshu, Li Tongtong, Zhang Gen, Yan Zheng, Liu Jiancong, Wang Lei
School of Materials and Environmental Engineering, Institute of Urban Ecology and Environment Technology, Shenzhen Polytechnic, Shenzhen, China.
Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, Fujian Agriculture and Forestry University, Fuzhou, China.
Front Chem. 2022 Jul 19;10:967589. doi: 10.3389/fchem.2022.967589. eCollection 2022.
The background value of iron in red soil is superior, primarily absorbed and homogeneously encapsulated in harvested biomass. However, this property on the high-value utilization of bionic iron-encapsulated biomass remains unknown. In this study, special biochar (Fe@BC) was obtained from this kind of biomass by one-step pyrolysis method, which was further used to activate peroxydisulfate (PDS) and degrade 2,4-dichlorophenol (2,4-DCP). The results showed that FeO was formed and homogeneously embedded in biochar at 500C. Comparing to catalysts prepared by impregnation pyrolysis (Fe/BC), Fe@BC exhibited excellent degradation performance (90.9%, k = 0.0037 min) for 2,4-DCP. According to the free radicals quenching studies, hydroxyl radicals (·OH) and superoxide radicals (·O ) were the dominant reactive oxygen species (ROS) in Fe@BC/PDS system. Importantly, a PDS adsorption model was established, and the electron transport and PDS activation in the core-shell structure were demonstrated by DFT calculations. Therefore, this study could supply a high-performance catalyst and significant implications for high-value biomass utilization in red soil.
红壤中铁的背景值较高，主要被吸收并均匀地包裹在收获的生物质中。然而，这种仿生铁包裹生物质的高值利用特性尚不清楚。本研究采用一步热解方法从这类生物质中获得了特殊生物炭（Fe@BC），并进一步用于活化过二硫酸盐（PDS）和降解2,4-二氯苯酚（2,4-DCP）。结果表明，在500℃下形成了FeO并均匀地嵌入生物炭中。与浸渍热解制备的催化剂（Fe/BC）相比，Fe@BC对2,4-DCP表现出优异的降解性能（90.9%，k = 0.0037 min⁻¹）。根据自由基淬灭研究，羟基自由基（·OH）和超氧自由基（·O₂⁻）是Fe@BC/PDS体系中主要的活性氧物种（ROS）。重要的是，建立了PDS吸附模型，并通过密度泛函理论（DFT）计算证明了核壳结构中的电子传输和PDS活化。因此，本研究可为红壤中高值生物质利用提供一种高性能催化剂及重要启示。
