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改性蜂窝煤渣吸附Cr(Ⅵ)的动力学和热力学性能

Keywords: 煤渣,吸附,Cr(Ⅵ),动力学,热力学

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Abstract:

利用碳酸钡对蜂窝煤渣进行改性,通过粉末X射线衍射光谱(XRD)和扫描电镜(SEM)对改性前后蜂窝煤渣的物质组成和形貌进行表征,研究了改性蜂窝煤渣吸附Cr(Ⅵ)的动力学和热力学性能。实验结果表明,改性蜂窝煤渣对Cr(Ⅵ)具有良好的吸附能力,吸附过程符合准二级吸附动力学模型。分别用Langmuir、Freundlich、D-R和Tempkin等4种吸附等温线模型对实验数据进行拟合,Langmuir方程拟合效果最好,25、35和45℃下的饱和吸附量分别为2.985、2.562和2.630mg/g。D-R和Tempkin模型研究表明,吸附过程属于物理吸附。热力学研究表明,改性蜂窝煤渣对Cr(Ⅵ)的吸附是一个自发的、放热过程。

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