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Recent advances in nanoscale zero-valent iron/oxidant system as a treatment for contaminated water and soil
Journal of Environmental Chemical Engineering ( IF 7.7 ) Pub Date : 2021-08-26 , DOI: 10.1016/j.jece.2021.106276
Xi Li 1, 2, 3 , Ling Liu 1
Affiliation  

Recently, an increasing number of studies have been reported about nanoscale zero-valent iron (nZVI) applied as catalysts in different oxidants activation processes to remediate pollutants in water and soil, which might be due to the great oxidation-reduction capabilities and high-efficiency in environmental application. In this review, we classify different oxidants into four categories: I. persulfate (PS), II. hydrogen peroxide (HP), III. bisulfite (BS) and sulfite, VI. sodium percarbonate salt (SPC) and CaO2. The overview of nZVI applications in oxidants activation processes for pollutant removal in water and soil is systematically summarized for the first time. Most importantly, the performance and remediation mechanism of different nZVI/oxidant are thoroughly investigated. Application of nZVI/oxidant in wastewater treatment and soil remediation are summarized and compared, also, possible interaction mechanism in organic and heavy metal co-contamination are discussed. Besides, the influencing factors (e.g. nZVI/oxidant, pH, temperature, dissolved oxygen, natural organic matter, inorganic ions, soil/liquid ratio, soil types and chelating agent) are investigated. Moreover, the potential effects of nZVI/oxidant on biological systems, and practical application are proposed. Finally, the constraints of the technology and further research prospect are summarized. We believe this review can shed light on application of nZVI in oxidant activation processes and present more comprehensive perspectives for future researches.



中文翻译:

纳米零价铁/氧化剂系统作为污染水和土壤处理的最新进展

最近,越来越多的研究报道了纳米零价铁(nZVI)作为催化剂在不同的氧化剂活化过程中修复水和土壤中的污染物,这可能是由于其强大的氧化还原能力和高效率。在环境应用中。在这篇综述中,我们将不同的氧化剂分为四类:I. 过硫酸盐 (PS)、II。过氧化氢(HP),III。亚硫酸氢盐 (BS) 和亚硫酸盐,VI。过碳酸钠盐 (SPC) 和 CaO 2. 首次系统地总结了 nZVI 在去除水和土壤中污染物的氧化剂活化过程中的应用概述。最重要的是,彻底研究了不同 nZVI/氧化剂的性能和修复机制。总结和比较了nZVI/氧化剂在废水处理和土壤修复中的应用,并讨论了有机和重金属共污染中可能的相互作用机制。此外,还研究了影响因素(如nZVI/氧化剂、pH、温度、溶解氧、天然有机物、无机离子、土液比、土壤类型和螯合剂)。此外,还提出了 nZVI/氧化剂对生物系统的潜在影响和实际应用。最后,总结了该技术的制约因素和进一步的研究前景。我们相信这篇综述可以阐明 nZVI 在氧化剂活化过程中的应用,并为未来的研究提供更全面的观点。

更新日期:2021-09-10
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