Kinetics and Mechanism of Adsorption of Phosphate on Fluorine-containing Calcium Silicate
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2016年第2期
论文作者：朱新华 ZHANG Zhao 沈俊
文章页码：321 - 327
摘 要：The nanowires-reticulated calcium silicate with a specific surface area more than 100 m2/g was prepared by a hydrothermalprocess using hydrated lime（Ca（OH）2,HL）and silica containing soluble fluoride,which was a by-product of fluorine industry,and the soluble fluoride in raw silica was fixed as CaSiF6 at the same time.The kinetic characteristics and mechanism of adsorbing phosphate by fluorine-containing calcium silicate were investigated in the experiments of phosphorus（P）removalfrom aqueous solution.The results show that the prepared fluorine-containing calcium silicate has excellent performance for adsorbing phosphate,the adsorption process appears to follow pseudo-second-order reaction kinetics and the process is mainly controlled by chemisorption.The product resulted from P adsorption is mainly composed of hydroxyapatite（HAP）and fluorapatite（FAP）,which are further used as adsorbents of heavy metalion Cd2+ in aqueous solution and display excellent performance.
朱新华，ZHANG Zhao，沈俊
College of Chemical Engineering,Sichuan University
摘 要：The nanowires-reticulated calcium silicate with a specific surface area more than 100 m2/g was prepared by a hydrothermalprocess using hydrated lime（Ca（OH）2,HL）and silica containing soluble fluoride,which was a by-product of fluorine industry,and the soluble fluoride in raw silica was fixed as CaSiF6 at the same time.The kinetic characteristics and mechanism of adsorbing phosphate by fluorine-containing calcium silicate were investigated in the experiments of phosphorus（P）removalfrom aqueous solution.The results show that the prepared fluorine-containing calcium silicate has excellent performance for adsorbing phosphate,the adsorption process appears to follow pseudo-second-order reaction kinetics and the process is mainly controlled by chemisorption.The product resulted from P adsorption is mainly composed of hydroxyapatite（HAP）and fluorapatite（FAP）,which are further used as adsorbents of heavy metalion Cd2+ in aqueous solution and display excellent performance.
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