Sairam Sundaram C, Viswanathan Natrayasamy, Meenakshi S
Department of Science and Humanities, Karaikal Polytechnic College, Karaikal 609609, Puducherry, India.
Bioresour Technol. 2008 Nov;99(17):8226-30. doi: 10.1016/j.biortech.2008.03.012. Epub 2008 Apr 22.
A bioinorganic composite namely nano-hydroxyapatite/chitosan (n-HApC) composite which could be employed for technology development was prepared and studied for its defluoridation efficiency. It has been observed that there was a slight enhancement in the defluoridation capacity (DC) of n-HApC composite (1560mgF(-)/kg) than nano-hydroxyapatite (n-HAp) which has a DC of 1296mgF(-)/kg. The sorbents were characterized with XRD and TEM studies. The fluoride sorption was explained with Freundlich and Langmuir isotherms. Thermodynamic parameters such as DeltaG degrees , DeltaH degrees , DeltaS degrees and Ea were calculated in order to understand the nature of sorption. The sorption process was found to be controlled by pseudo-second-order and pore diffusion models. Field studies were carried out with the fluoride containing water sample collected from a fluoride-endemic area in order to test the suitability of the sorbents at field conditions.
制备了一种可用于技术开发的生物无机复合材料，即纳米羟基磷灰石/壳聚糖（n-HApC）复合材料，并对其除氟效率进行了研究。据观察，n-HApC复合材料的除氟能力（DC）（1560mgF(-)/kg）比纳米羟基磷灰石（n-HAp）略有提高，n-HAp的DC为1296mgF(-)/kg。通过XRD和TEM研究对吸附剂进行了表征。用Freundlich和Langmuir等温线解释了氟吸附现象。计算了诸如ΔG°、ΔH°、ΔS°和Ea等热力学参数，以了解吸附的性质。发现吸附过程受准二级和孔扩散模型控制。对从氟病区采集的含氟水样进行了现场研究，以测试吸附剂在现场条件下的适用性。
