Activation of peroxydisulfate by nanoscale zero-valent iron for sulfamethoxazole removal in agricultural soil: Effect, mechanism and ecotoxicity
Activation of peroxydisulfate by nanoscale zero-valent iron for sulfamethoxazole removal in agricultural soil: Effect, mechanism and ecotoxicity
复制标题
纳米零价铁活化过二硫酸盐去除农业土壤中的磺胺甲恶唑：效果、机制和生态毒性
DOI：
10.1016/j.chemosphere.2019.02.074
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发表时间：
2019
期刊：
影响因子：
8.8
通讯作者：
Guoxuan Fan
中科院分区：
文献类型：
--
作者：
Zhou Zhou;Jun Ma;Xitao Liu;Chunye Lin;Ke Sun;Huijuan Zhang;Xiaowan Li;Guoxuan Fan
在本研究中，纳米级零价铁（nZVI）成功激活过硫酸盐（PDS）降解农业土壤中的磺胺甲恶唑（SMX，环境中常见的抗生素）。结果表明,SMX的降解是影响nZVI剂量,SMX的比例/ PDS,土壤/水的比例,反应温度,和肉桂土壤87.6%的SMX退化可以实现在4 h 30 °C时,初始nZVI剂量为0.03 g g−1土壤,SMX的摩尔比率/ PDS = 1/75和土壤/水 = 1/1。自由基清除剂实验和电子自旋共振（ESR）实验结果表明，羟基自由基（dotOH自由基）是该体系的主要活性物质。通过萌发试验、发光细菌试验和酶活性试验对土壤进行生态毒性试验，结果表明，处理后土壤的生态毒性明显低于污染土壤。此外，与原始土壤相比，对植物生长几乎没有影响。此外，该系统对SMX在不同类型农用土壤中均表现出较强的降解能力，其余4种土壤SMX的降解效率分别为90.6%（黄棕土）、80.8%（棕土）、86.5%（黑土）和96.1%（红土）。本研究为农业土壤污染防治提供了一种可选的方法。
In this study, peroxydisulfate (PDS) was successfully activated by nanoscale zero-valent iron (nZVI) for the degradation of sulfamethoxazole (SMX, antibiotic frequently detected in the environment) in agricultural soils. The results indicated that the degradation of SMX was affected by the nZVI dose, the ratio of SMX/PDS, the ratio of soil/water and reaction temperature, and in cinnamon soils 87.6% of SMX degradation can be achieved within 4 h at 30 °C when the initial nZVI dose was 0.03 g g−1soil, the molar ratio of SMX/PDS = 1/75 and the soil/water = 1/1. The results of radical scavenger experiments and electron spin resonance (ESR) tests showed that hydroxyl radical (radical dotOH) was the dominant reactive species in this system. The ecotoxicity tests of the soil by germination test, luminescent bacteria experiment and enzyme activity test indicated that the ecotoxicity of soil after treatment was obviously lower than the contaminated soil. In addition, there was almost no effect on plant growth when compared with original soil. Furthermore, this system exhibited a great degradation capacity for SMX in different types of agricultural soils, and the degradation efficiencies of SMX in other four soils were 90.6% (yellow brown earths), 80.8% (brown earths), 86.5% (black soils) and 96.1% (red earths), respectively. This work provides an optional method for agricultural soil pollution control.