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环境化学  2015 

紫外光辐射鱼腥藻产生羟基自由基的特性

Keywords: 紫外,鱼腥藻,羟自由基,特性

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Abstract:

为了清晰藻类光化学生态修复受污染水体中活性氧的作用机制,研究了低紫外辐射强度下鱼腥藻产生羟基自由基(·OH)的特性,并系统分析了关键因素的影响.结果表明,紫外光辐射鱼腥藻可产生大量的·OH,暗处和自然光条件下短时间内·OH产生量近似为零.鱼腥藻数量增加,可提升·OH产生量,过高藻浓度可导致光穿透性变差.鱼腥藻水溶液酸性较强或呈碱性时,不利于·OH的产生,较适宜pH值为6—7.低温不利于·OH的产生,且35℃时·OH产生量与25℃时·OH产生量相差较小.增加光照强度,可提升·OH的产生量.热预处理鱼腥藻不利于·OH的形成,但超声处理鱼腥藻可提高·OH产生量.

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