School of Ecology and Environment, Northwestern Polytechnical University, 710129 Xi'an, PR China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, 710055 Xi'an, PR China.
School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, 710055 Xi'an, PR China.
J Hazard Mater. 2021 Sep 5;417:126026. doi: 10.1016/j.jhazmat.2021.126026. Epub 2021 May 10.
Recyclable Fe in soil was prepared by using fermented food waste supernatant. The efficient cyclic oxidation of long-chain alkanes in oil-contaminated soils could be achieved by Fenton oxidation with the recyclable Fe. The oxidation efficiency of macro long-chain alkanes (C-C) from the first cycle (63.4%) to the last cycle (60.1%) showed no significant decrease during three-cycle Fenton oxidation with the recyclable Fe. However, for the oil-absorbing Fe prepared by HA and Fe-SOM prepared by Cs, the oxidation efficiency of C-C could not be efficiently cyclic oxidized during three-cycle Fenton oxidation. Further analysis showed that the proportion of Fe(III) in the recyclable Fe was higher than that in the oil-absorbing Fe or the Fe-SOM, where the iron content was similar. Moreover, more fulvic-like acid and humic-like acid were found in the recyclable Fe, and thus many Fe(III) ions simultaneously combined with the fulvic-like acid and humic-like acid through -C-O-C and C˭O bonds in the recyclable Fe. It was the recyclable Fe with such a stable structure that could still maintain high catalytic activity and efficiently cyclic oxidize macro long-chain alkanes during three-cycle Fenton oxidation, which is valuable for its repeated use.
利用发酵食物垃圾上清液制备了可回收铁。通过 Fenton 氧化作用，可利用可回收铁有效地氧化污染土壤中的长链烷烃。在三周期 Fenton 氧化作用中，可回收铁的宏观长链烷烃（C-C）的氧化效率从第一周期（63.4%）到最后一周期（60.1%）没有明显下降。然而，对于 HA 制备的吸油铁和 Cs 制备的 Fe-SOM，在三周期 Fenton 氧化作用中，C-C 的氧化效率不能有效地进行循环氧化。进一步的分析表明，可回收铁中的 Fe(III)比例高于吸油铁或 Fe-SOM，尽管铁含量相似。此外，可回收铁中发现了更多类似富里酸和胡敏酸的物质，因此许多 Fe(III)离子同时通过可回收铁中的-C-O-C 和 C˭O 键与类似富里酸和胡敏酸结合。正是这种具有稳定结构的可回收铁，在三周期 Fenton 氧化作用中仍能保持高催化活性并有效地循环氧化宏观长链烷烃，这对于其重复使用是有价值的。
