Abstract:

Honeycomb-cinder was modified by calcium hydroxide. The powder X ray diffraction spectrum（XRD）was applied to characterize the material compositions of the cinder before and after the modification. A study was conducted regarding the adsorption performances of modified honeycomb-cinder on Cr(Ⅵ) adsorption in simulated chromium-containing waste water. The influence of absorbent dosage，adsorption time，pH，stirring speed，temperature，initial concentration of Cr(Ⅵ) ion on adsorption had been investigated. Optimized conditions for adsorption of Cr(Ⅵ) were achieved as absorbent dosage 40 g/L，room temperature，stirring speed 150 r/min，adsorption time 40 min，and initial concentration of Cr(Ⅵ) 30 mg/L. Under the optimized condition，removal rate of Cr(Ⅵ) can reach 98.84%. Modified cinder absorbent had a good adsorption capacity for Cr(Ⅵ). The adsorption reaction was consistent with the second order kinetic equation and the adsorption process followed the Langmuir adsorption isotherm. The Cr(Ⅵ)adsorption by the modified honeycomb-cinder from the waste water was the joint function result of cinder components and new molecular sieve components.

摘要：

利用氢氧化钙对蜂窝煤渣进行改性，并通过粉末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。探讨了吸附剂用量、吸附时间、pH值、振荡速率、温度以及Cr(Ⅵ)初始浓度等对吸附效果的影响。改性蜂窝煤渣吸附处理Cr(Ⅵ)的最佳工艺条件是：吸附剂用量40 g/L，室温下以150 r/min振荡速率吸附处理40 min，当Cr(Ⅵ)初始浓度为30 mg/L时，Cr(Ⅵ)的去除率能达到98.84%。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并且可用Langmuir吸附等温线来描述。改性蜂窝煤渣对模拟废水中Cr(Ⅵ)的吸附是煤渣组分和新生分子筛组分共同作用的结果。