Abstract：
Heterogeneous catalytic processes based on zero-valent iron (ZVI) have been developed to treat soil and wastewater pollutants. However, the agglomeration of ZVI reduces its ability to activate persulfate (PS). In this study, a new Fe-Mn@AC activated material was prepared to activated PS to treat oil-contaminated soil, and using the microscopic characterization of Fe-Mn@AC materials, the electron transfer mode during the Fe-Mn@AC activation of PS was clarified. Firstly, the petroluem degradation rate was optimized. When the PS addition amount was 8%, Fe-Mn@AC addition amount was 3% and the water to soil ratio was 3:1, the petroluem degradation rate in the soil reached to the maximum of 85.69% after 96 h of reaction. Then it was illustrated that sulfate and hydroxyl radicals played major roles in crude oil degradation, while singlet oxygen contributed slightly. Finally, the indigenous microbial community structures remaining after restoring the Fe-Mn@AC/PS systems were analyzed. The proportion of petroleum degrading bacteria in soil increased by 23% after oxidation by Fe-Mn@AC/PS system. Similarly, the germination rate of wheat seeds revealed that soil toxicity was greatly reduced after applying the Fe-Mn@AC/PS system. After the treatment with Fe-Mn@AC/PS system, the germination rate, root length and bud length of wheat seed were increased by 54.05%, 7.98 mm and 6.84 mm, respectively, compared with the polluted soil group. These results showed that the advanced oxidation system of Fe-Mn@AC activates PS and can be used in crude oil-contaminated soil remediation.
摘要：
已经开发了基于零价铁（ZVI）的多相催化工艺来处理土壤和废水污染物。然而,ZVI的团聚降低了其活化过硫酸盐(PS)的能力。在这项研究中,制备了一种新的Fe-Mn@AC活化材料，用于活化PS处理石油污染土壤，并对Fe-Mn@AC材料进行了微观表征,阐明了PSFe-Mn@AC活化过程中的电子转移模式。首先,优化了petroluem降解率。当PS添加量为8%时，Fe-Mn@AC添加量为3％，水土比为3：1，反应96小时后，土壤中的石油降解率达到85.69％的最大值。然后说明硫酸盐和羟基自由基在原油降解中起主要作用，而单线态氧贡献轻微。最后,分析了Fe-Mn@AC/PS系统恢复后剩余的本地微生物群落结构。Fe-Mn@AC/PS体系氧化后，土壤中石油降解菌的比例增加了23%。同样，小麦种子的发芽率表明，施用Fe-Mn@AC/PS系统后，土壤毒性大大降低。Fe-Mn@AC/PS体系处理后,发芽率，小麦种子的根长和芽长增加了54.05%，7.98毫米和6.84毫米，分别,与污染土壤组相比。结果表明，Fe-Mn@AC高级氧化体系可激活PS，可用于原油污染土壤修复。
