Defluoridation behavior of nanostructured hydroxyapatite synthesized through an ultrasonic and microwave combined technique
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- 作者：Gé ; rrard Eddy Jai Poinern ; Malay K. Ghosh ; Yan-Jing Ng ; Touma B. Issa ; Shashi An ; Pritam Singh
- 关键词：Adsorption ; Defluoridation ; Nanohydroxyapatite ; Fluoride ; Ultrasonic irradiation ; Microwaves
- 刊名：Journal of Hazardous Materials
- 出版年：2011
- 出版时间：15 January 2011
- 年：2011
- 卷：185
- 期：1
- 页码：29-37
- 全文大小：710 K
文摘
The absorption performance of a nano-structured hydroxyapatite produced from a combined ultrasonic and microwave technique was examined for the removal of fluoride from contaminated water. The effect of physical and chemical parameters such as initial pH, contact time, initial fluoride concentration and temperature were investigated. The results indicated that the equilibrium adsorption data followed both the Langmuir and Freundlich isotherms, with a maximum monolayer adsorption capacity of 5.5 mg/g at 298 K. In addition, the kinetic studies have shown that the fluoride adsorption data followed a pseudo-second order model and that the intra-particle diffusion process played a significant role in determining the rate. The thermodynamic analysis also established that the adsorption process was endothermic and spontaneous. The initial and final fluoride loaded nano-hydroxyapatite samples were characterized using FESEM, TEM, XRD, FTIR and XPS methods. The analysis revealed that structural changes to the adsorbent had taken place.