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The nanowires-reticulated calcium silicate with a specific surface area more than 100 m~2/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 CaSiF_6 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 Cd~(2+) in aqueous solution and display excellent performance.
The nanowires-reticulated calcium silicate with a specific surface area more than 100 m ~ 2 / g was prepared by a hydrothermal process 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 CaSiF_6 at the same time. kinetic characteristics and mechanism of adsorbing phosphate by fluorine-containing calcium silicate were investigated in the experiments of phosphorus (P) removal from aqueous solution. results that 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 was derived from P adsorption is mainly composed of hydroxyapatite (HAP) and fluorapatite (FAP), which are further used as adsorbents of heavy metal ions Cd ~ (2+) in aqueous solution and display excellent performance.