Environmental Science and Pollution Research Pub Date : 2021-05-18 , DOI: 10.1007/s11356-021-13972-w Bing Wang 1, 2 , Chaoxiao Deng 1 , Wei Ma 1 , Yubo Sun 1
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Under the action of different activators, persulfate can produce sulfate radicals (SO4·–) with strong oxidizing ability, which can destruct many organic compounds. Meanwhile, persulfate is widely used in groundwater and soil remediation because of its fast reaction and wide application. With the high specific surface area and reactivity of nanoscale zero-valent iron (nZVI), it can enhance the degradation efficiency of the persulfate system on organic pollutants in soil and water as a persulfate activator. However, nZVI is easy to get oxidized and has a tendency to aggregation. To solve these problems, a variety of nZVI modification methods have been put forward and put into to applications in the activation of persulfate. This article will give a systematic introduction of the background and problems of nZVI-activated persulfate in the remediation of organic pollution. In addition, the modification methods and mechanisms of nZVI are summarized, and the applications and progress of modified nZVI-activated persulfate are reviewed. The factors that affect the removal of organic compounds by the activation system are discussed as well. Worldwide, the field studies and full-scale remediation using modified nZVI in persulfate activation are yet limited. However, the already known cases reveal the good prospect of applying modified nZVI in persulfate activation to organic pollution remediation.
Graphical abstract
中文翻译：
过硫酸盐活化中的改性纳米零价铁用于有机污染修复：综述
在不同的活化剂的作用下，过硫酸盐会产生硫酸根（SO 4 · –）具有很强的氧化能力，可以破坏许多有机化合物。同时，过硫酸盐因其反应速度快，应用广泛而被广泛用于地下水和土壤修复。纳米零价铁（nZVI）具有较高的比表面积和反应活性，可提高过硫酸盐体系对土壤和水中有机污染物作为过硫酸盐活化剂的降解效率。但是，nZVI容易被氧化，并且有聚集的趋势。为了解决这些问题，已经提出了多种nZVI改性方法并将其用于过硫酸盐的活化中。本文将系统地介绍nZVI活化过硫酸盐在有机污染修复中的背景和存在的问题。此外，综述了nZVI的改性方法和机理，综述了改性nZVI活化的过硫酸盐的应用和进展。还讨论了影响通过活化系统除去有机化合物的因素。在世界范围内，在过硫酸盐活化中使用修饰的nZVI进行的野外研究和大规模修复还受到限制。但是，已经知道的案例揭示了在过硫酸盐活化中将修饰的nZVI应用于有机污染修复的良好前景。
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