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首页> 外文期刊>Environmental engineering research >Degradation of Chlorinated Phenols by Zero Valent Iron and Bimetals of Iron: A Review
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Degradation of Chlorinated Phenols by Zero Valent Iron and Bimetals of Iron: A Review

机译：零价铁和铁的双金属降解氯化苯酚的研究进展

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摘要

Chlorophenols (CPs) are widely used industrial chemicals that have been identified as being toxic to both humans and the environment. Zero valent iron (ZVI) and iron based bimetallic systems have the potential to efficiently dechlorinate CPs. This paper reviews the research conducted in this area over the past decade, with emphasis on the processes and mechanisms for the removal of CPs, as well as the characterization and role of the iron oxides formed on the ZVI surface. The removal of dissolved CPs in iron-water systems occurs via dechlorination, sorption and co-precipitation. Although ZVI has been commonly used for the dechlorination of CPs, its long term reactivity is limited due to surface passivation over time. However, iron based bimetallic systems are an effective alternative for overcoming this limitation. Bimetallic systems prepared by physically mixing ZVI and the catalyst or through reductive deposition of a catalyst onto ZVI have been shown to display superior performance over unmodified ZVI. Nonetheless, the efficiency and rate of hydro-dechlorination of CPs by bimetals depend on the type of metal combinations used, properties of the metals and characteristics of the target CP. The presence and formation of various iron oxides can affect the reactivities of ZVI and bimetals. Oxides, such as green rust and magnetite, facilitate the dechlorination of CPs by ZVI and bimetals, while oxide films, such as hematite, maghemite, lepidocrocite and goethite, passivate the iron surface and hinder the dechlorination reaction. Key environmental parameters, such as solution pH, presence of dissolved oxygen and dissolved co-contaminants, exert significant impacts on the rate and extent of CP dechlorination by ZVI and bimetals.
机译：氯酚（CPs）是广泛使用的工业化学品，已被确定对人类和环境均具有毒性。零价铁（ZVI）和铁基双金属系统具有有效将CP脱氯的潜力。本文回顾了过去十年在该领域进行的研究，重点是去除CP的过程和机理，以及ZVI表面形成的铁氧化物的特征和作用。铁-水系统中溶解的CP的去除是通过脱氯，吸附和共沉淀进行的。尽管ZVI通常用于CP的脱氯，但是由于长期的表面钝化，其长期反应性受到限制。但是，铁基双金属系统是克服此限制的有效替代方法。通过物理混合ZVI和催化剂或通过将催化剂还原沉积到ZVI上制备的双金属体系已显示出比未改性ZVI优越的性能。但是，双金属对CP进行加氢脱氯的效率和速率取决于所用金属组合的类型，金属的性质和目标CP的特性。各种铁氧化物的存在和形成会影响ZVI和双金属的反应活性。氧化物（例如绿锈和磁铁矿）有助于ZVI和双金属对CP进行脱氯，而氧化膜（例如赤铁矿，磁赤铁矿，纤铁矿和针铁矿）会使铁表面钝化并阻碍脱氯反应。关键的环境参数（例如溶液的pH值，溶解氧的存在和溶解的助污染物的存在）对ZVI和双金属对CP脱氯的速率和程度产生重大影响。

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