Preparation of iron-modified portland cement adsorbent and the investigation of its decolorization performance

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Jiang, Bo^1 ; Wang, Huifeng^1 ; Li, Yang^2 ; Li, Zhen^1

College of Chemistry and Chemical Engineering, Taishan University, Taian

271000, China^1

Shandong Coalfield Geological Planning and Prospecting Research Institute, Jinan

253100, China^2

关键词: Adsorption performance;    Calcium silicate hydrate gel;    Combination mechanisms;    Modified portland cement;    Ordinary Portland cement;    Physicochemical property;    Pseudo second order kinetics;    Reactive brilliant blue kn-r;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/2/022015/pdf
DOI  :  10.1088/1755-1315/121/2/022015

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The ordinary portland cement was modified by ferric salt impregnation method. Through the technologies of x-ray diffraction, scanning electron microscope and energy dispersive spectroscopy, the physicochemical properties of modified cement were detected and analyzed. It was found that after the modification, the main constituents of raw cement, tricalcium silicate and dicalcium silicate had been depleted, and the new crystal mineral of antarcticite replaced them. The iron precipitates and cement hydration products calcium silicate hydrate gel mainly existed in the form of amorphous on modified cement. The results of BET specific surface determination showed that the modified cement particles had mesoporous distribution. The results of adsorption experiment revealed modified cement exhibited excellent adsorption performance on reactive brilliant blue KNR. The combination mechanism between modified cement and adsorbate was mainly electrostatic interaction. The adsorption process satisfied with the pseudo-second order kinetics model, and the adsorption reaction was a spontaneous endothermic process.