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环境化学  2015 

三乙烯四胺(TETA)抑制磁黄铁矿氧化的机理研究

Keywords: 磁黄铁矿,三乙烯四胺,氧化,Thiobacillusferrooxidans

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Abstract:

本文分别对三乙烯四胺(TETA)抑制磁黄铁矿在空气和Thiobacillusferrooxidans细菌作用下的氧化过程进行了研究.结果表明TETA不但能有效防止磁黄铁矿在85—90%湿度空气中的氧化,还能显著阻止Thiobacillusferrooxidans对样品的生物氧化.与对照样品相比,在空气中氧化90d和被细菌氧化42d后,经TETA简单包膜处理样品的氧化程度分别降低了54.7%和82.07%.TETA通过在样品表面形成一层致密的膜来隔绝样品与氧气的接触,从而抑制了磁黄铁矿的空气氧化;碱性TETA还能通过提高反应体系的pH值、恶化嗜酸细菌Thiobacillusferrooxidans的生存环境来阻止样品的生物氧化.

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