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.