RESEARCH PROGRESS IN PREPARATION TECHNOLOGY AND APPLICATION OF NANO-ZERO-VALENT IRON
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摘要: 纳米零价铁(nZVI)因具有还原性强、粒径小、比表面积大等特性,对重金属及含卤有机污染物等具有良好的吸附特性和反应活性,在环境修复方面表现出较好的应用前景。但nZVI易氧化、团聚和机械强度低等不利因素限制了其大规模应用。系统比较了机械法、气体冷凝法及还原法制备nZVI技术的特点,重点总结表面改性、金属改性、载体负载和基质封装等手段制备改性nZVI的研究进展,及其在水体及土壤环境修复方面的应用。Abstract: Nano-zero-valent iron (nZVI) has good adsorption properties and reactivity for heavy metals and halogen-containing organic pollutants, due to its strong reducibility, small particle size and large specific surface area. It has good application prospects in environmental remediation. However, the large-scale application of nZVI is limited by its easy oxidation, agglomeration and low mechanical strength. This paper systematically compared the characteristics of mechanical method, gas condensation method and reduction method in preparing nZVI. It mainly summarized the research progress of surface modification, metal modification, carrier loading and matrix encapsulation, as well as their application in water and soil environmental remediation.
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Key words:
- nano-zero-valent iron /
- preparation /
- modification
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