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| Preparation, Characterization and Fluoride Adsorption of a CaO-Al2O3 Binary Oxide Adsorbent |
| XU Naicai1,2, SHI Dandan3, DANG Li2, HONG Tianzeng2, DONG Yaping2, LIU Zhong2, LI Wu2
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1 Department of Chemistry, Qinghai Normal University, Xining 810008;
2 Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008;
3 Institute of Science and Technology Information of Qinghai Province, Xining 810008 |
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Abstract A novel binary oxide adsorbent of CaO-Al2O3 was successfully prepared via impregnation technology followed by calcination procedure with δ-Al2O3 as a precursor. The adsorbent was thoroughly characterized by XRD, SEM, FT-IR, TG and BET technics in order to investigate its crystalline, morphology, thermal stability and structural properties. At the same time, the effects of pH and adsorption time on the fluoride removal were thoroughly studied by a batch of adsorption experiments. The experimental results indicated that both δ-Al2O3 and CaO-Al2O3 present nano-sized particle morphology with mesoporous structure. The specific BET surface areas of δ-Al2O3 and CaO-Al2O3 were 167.8 m2/g and 72.3 m2/g, respectively. The optimal pH value for fluoride removal by CaO-Al2O3 was about 8.0. Adsorption capacity of CaO-Al2O3 was higher than Al2O3 when the adsorption time exceeded 220 min, and the fluoride removal rate reached 65.42% when the adsorption time was 480 min.
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Published: 25 August 2017
Online: 2018-05-07
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2017, Vol. 31 
