酸法改性煤渣吸附Cr（Ⅵ）的性能研究

摘要：利用盐酸对蜂窝煤渣进行改性，通过粉末X射线衍射光谱（XRD）对改性前后蜂窝煤渣的物质组成进行表征，研究了改性蜂窝煤渣对模拟含铬废水中Cr（Ⅵ）的吸附性能．改性蜂窝煤渣对Cr（Ⅵ）具有良好的吸附能力，吸附过程符合二级吸附动力学模型．分别用Langmuir和Freundlich吸附等温线模型对实验数据进行拟合，结果表明，吸附过程更符合Freundlich模型，20℃、30℃、40℃下的1／n值分别为0．397、0．2992和0．1925．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吸热过程．

Study on adsorption performance of Cr(Ⅵ) by modified honeycomb-cinder

Honeycomb-cinder was modified by hydrochloric acid. The powder X-ray diffraction spectrum（XRD）was applied to characterize the material compositions of the cinder before and af- ter the modification. A study was conducted regarding the adsorption performances of modified honeycomb-cinder on Cr（Ⅵ） adsorption in simulated chromium-containing waste water. Modified cinder had a good adsorption capacity for Cr（Ⅵ） and the adsorption reaction was consistent with the second order kinetic equation. Adsorption isothermal data was interpreted by the Langmuir and Freundlich equations. The results showed that the sorption process followed the Freundlich model well. The values of 1/n were 0. 397, 0. 2992 and 0. 1925 at 20℃, 30℃ and 40℃, respec- tively. The negative ＆G 0 values and the positive △H^0,△S^0 at various temperatures confirmed that the adsorption processes were spontaneous and endothermic.