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环境化学  2015 

互花米草活性炭对镉的吸附

Keywords: 互花米草,活性炭,镉吸附,吸附等温线,pH值

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Abstract:

进行了磷酸活化法不同浸渍比(0.5—3.0)及活化温度(400℃—700℃)条件下制备的互花米草活性炭对镉的吸附性能研究,采用静态吸附法,考察不同初始浓度条件下活性炭对镉的平衡吸附量,旨在探索吸附机理、影响因素、除镉吸附剂的最佳制备条件以及活性炭物化性质对镉吸附性能的影响.实验表明,浸渍比和活化温度是影响成品活性炭镉吸附性能的重要因素,浸渍比为1.0,活化温度为700℃条件下所制备的活性炭对镉的吸附性能最好,其Langmuir最大吸附容量可达47.85mg·g-1.活性炭对镉的吸附与其比表面积及孔结构等物理性质有关,但起决定作用的是其表面化学性质,离子交换在吸附过程中发挥了重要的作用.当pH值在2—4时,活性炭对镉的吸附能力随pH的增大而增大,当pH>4时,吸附曲线趋于平稳.

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