Li Yong-Tao, Sui Qin, Li Xi, Liu Xin-Yue, Liu Hao, Wang Yu-Qin, Du Wan-Ying
College of Chemistry & Chemical Engineering, Southwest Petroleum University, Chengdu, 610500, People's Republic of China.
Oil & Gas Field Applied Chemistry Key Laboratory of Sichuan Province, Chengdu, Sichuan, 610500, People's Republic of China.
Environ Sci Pollut Res Int. 2024 May;31(23):33385-33397. doi: 10.1007/s11356-024-33408-5. Epub 2024 Apr 28.
In this study, FeO magnetic nanoparticles (FeO MNPs) were assessed for their ability to enhance the activity of persulfate (PS). Various controlling factors including PS dosages, initial pH, water-soil ratio, ratio of Fe, and FeO MNPs to PS were considered in both the Fe/PS system and the FeO MNPs/PS system. Results showed that the FeO MNP-activated PS system exhibited high processing efficiency owing to the gradual release of Fe. This process occurred in a wide pH range (5-11), attributed to the synergistic action of sulfate radicals (SO·) and hydroxyl radicals (OH·) under alkaline conditions, effectively mitigating soil acidification. The ratio of FeO MNPs to PS and water-soil ratio significantly influenced the degradation rate with the highest petroleum hydrocarbon degradation rate exceeding 80% (82.31%). This rate was 3.1% higher than that achieved by the Fe/PS system under specific conditions: PS dosage of 0.05 mol/L, FeO MNPs to PS ratio of 1:10, water-soil ratio of 2:1, and initial pH of 11. Meanwhile, oxidant consumption in the FeO MNPs/PS system was halved compared to the Fe/PS system due to the slow release of Fe and less ineffective consumption of SO·. Mechanistically, the possible degradation process was divided into three parts: the initial chain reaction, the proliferating chain reaction, and the terminating chain reaction. The introduction of FeO MNPs accelerated the degradation rate of pentadecane, heneicosane, eicosane, tritetracontane, and 9-methylnonadecane.
在本研究中，对FeO磁性纳米颗粒（FeO MNPs）增强过硫酸盐（PS）活性的能力进行了评估。在Fe/PS体系和FeO MNPs/PS体系中，考虑了各种控制因素，包括PS剂量、初始pH值、水土比、Fe以及FeO MNPs与PS的比例。结果表明，由于Fe的逐渐释放，FeO MNP活化的PS体系表现出较高的处理效率。该过程在较宽的pH范围（5-11）内发生，这归因于碱性条件下硫酸根自由基（SO·）和羟基自由基（OH·）的协同作用，有效减轻了土壤酸化。FeO MNPs与PS的比例以及水土比对降解速率有显著影响，最高石油烃降解率超过80%（82.31%）。该速率比在特定条件下Fe/PS体系的降解率高3.1%：PS剂量为0.05 mol/L，FeO MNPs与PS的比例为1:10，水土比为2:1，初始pH值为11。同时，由于Fe的缓慢释放以及SO·的无效消耗较少，FeO MNPs/PS体系中的氧化剂消耗量相比Fe/PS体系减半。从机理上讲，可能的降解过程分为三个部分：初始链反应、增殖链反应和终止链反应。FeO MNPs的引入加速了十五烷、二十一烷、二十烷、三十四烷和9-甲基十九烷的降解速率。
