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环境化学  2015 

零价铝/酸体系对活性黑染料脱色降解的强化

Keywords: 零价铝/酸体系,氧化降解,活性黑染料,铁源,多金属氧酸盐

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Abstract:

采用零价铝/酸体系(Zerovalent-aluminumacidsystem)处理活性黑5染料溶液.以活性黑5在特征吸收波长595nm的吸光度变化为分析指标,考察了Fe0、Fe2+、Fe3+、多金属氧酸盐(POM)对染料溶液脱色的强化过程.结果表明,在摇床转速175r·min-1、pH2.5、25℃和铝粉投加量为2g·L-1条件下,低剂量的铁源对零价铝/酸体系具有促进的作用,提高了零价铝/酸体系对活性黑5的降解脱色效率,当外加铁源达到一定的量时,这种加强作用会减弱.在0—0.50mmol·L-1范围内,POM加入后的拟一级反应速率常数是POM加入前的1.46倍,去除率从75%提高到95%.活性黑5的降解符合拟一级反应动力学模型.

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