Preparation and Adsorption Performance of Hydroxyapatite/Attapulgite Composite Beads
Hydroxyapatite/ attapulgite composite beads (HAP/ATT) were made through mixing hydroxyapatite and attapulgite at certain ratio and spheroidizing.Hydroxyapatite was synthetized by wet chemical methods at different calcium phosphorous ratio, and the product with the highest defluoridation capacity was selected as mission ball.The spheroidization process hasn”t changed the structure and properties of hydroxyapatite characterized by FTIR and XRD.The adsorption process of HAP/ATT is influenced by adsorption time, temperature and pH value.The adsorption approaches to equilibrium within 80mins.High temperature is conducive to the adsorption process.The optimum pH value of adsorption process is about 3.The adsorption process is close to the monolayer adsorption.It is a spontaneous endothermic process (△Hθ> 0, △Gθ<0) and△Sθ is 0.0292KJ/ (mol.K) in the adsorption process.
hydroxyapatite/ attapulgite composite beads preparation adsorption performance defluoridation
Li Feng Xiaofeng Shi Zeshan Liu Maosen Ju
School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 22111 Jiangsu Yongguan Water Supply and Drainage Equipment Co.Ltd.,Xuzhou221116,Jiangsu,China Chinese Agricultural Water-saving & Rural Drinking Water Supply Technology Association,Beijing100053
国内会议
哈尔滨
英文
540-547
2013-12-01（万方平台首次上网日期，不代表论文的发表时间）