Li Binrong, Wang Chen, Li Na, Chen Chunyang, Zhu Zhi, Tang Xu, Cui Yanhua, Liu Tingting, Attatsi Collins Kwashie, Wang Xuedong
National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China.
National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China.
Environ Pollut. 2024 Apr 1;346:123660. doi: 10.1016/j.envpol.2024.123660. Epub 2024 Feb 26.
Immobilizing Fe-based nanoparticles on electron-rich biochar has becoming an attractive heterogeneous Fenton-like catalysts (Fe/BC) for wastewater decontamination. However, the insufficient graphitization of biochar causing low electron transfer and by slow HO activation limited its application. Herein, we firstly constructed FeS/biochar composite through all-solid molten salt method (Fe/MSBCs), which can provide strong polarization force and liquid reaction environment to improve carbonization. As expected, the obtained Fe/MSBCs exhibits high surface area and fast interfacial electron transfer between FeS and biochar. More importantly, the partially oxidized FeS (001) facet facilitate HO adsorption and thermodynamically easily decomposition into •OH. Such a synergistic effect endowed them excellent photo-Fenton degradation performance for methyl orange (MO) with large kinetic rate constants (0.079 min) and high HO utilization efficiency (95.9%). This study first demonstrated the critical regulatory role of molten salt method in iron-based biochar composites, which provide an alternative for HO activator in water pollutant control.
将铁基纳米颗粒固定在富电子生物炭上已成为一种有吸引力的用于废水净化的非均相类芬顿催化剂（Fe/BC）。然而，生物炭石墨化不足导致电子转移缓慢且羟基自由基（•OH）活化缓慢，限制了其应用。在此，我们首次通过全固态熔盐法构建了FeS/生物炭复合材料（Fe/MSBCs），该方法可提供强大的极化力和液相反应环境以促进炭化。正如预期的那样，所制备的Fe/MSBCs具有高比表面积以及FeS与生物炭之间快速的界面电子转移。更重要的是，部分氧化的FeS（001）晶面有利于羟基自由基（•OH）吸附，并且在热力学上易于分解为•OH。这种协同效应赋予它们对甲基橙（MO）优异的光芬顿降解性能，具有大的动力学速率常数（0.079 min⁻¹）和高的羟基自由基（•OH）利用效率（95.9%）。本研究首次证明了熔盐法在铁基生物炭复合材料中的关键调控作用，为水污染物控制中的羟基自由基（•OH）活化剂提供了一种替代方案。
