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环境化学  2015 

热活化自来水厂铁盐污泥的磷吸附特性

Keywords: 铁盐污泥,磷吸附,热活化

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Abstract:

研究了经不同温度活化处理的自来水厂铁盐污泥的磷吸附特性.结果表明,经100℃、300℃、500℃和900℃活化的污泥(分别称为IS100、IS300、IS500和IS900)对溶液中无机磷的吸附都符合Langmuir方程,其磷吸附容量分别为6.329、12.20、8.197和3.401g·kg-1,这说明热活化能改变污泥对磷的吸附性能,300℃为最佳活化温度.对IS300的吸附特性研究表明,IS300对磷的吸附能力随吸附反应温度的升高而升高,随溶液初始pH的升高而降低.反应的焓变ΔH0>0,熵变ΔS0>0,自由能变ΔG0<0,这表明吸附是自发的吸热反应,推动力是ΔS0.IS300对磷的吸附动力学过程符合双常数方程和Elovich方程.

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