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Rapid Mix Preparation of Bioinspired Nanoscale Hydroxyapatite for Biomedical Applications

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Fluoride sorption by nano-hydroxyapatite/chitin composite.

C Sairam Sundaram¹, Natrayasamy Viswanathan, S Meenakshi

¹Department of Science and Humanities, Karaikal Polytechnic College, Karaikal 609609, Puducherry, India. sairam adithya@yahoo.com

Journal of Hazardous Materials

|August 4, 2009

Summary

A new nano-hydroxyapatite/chitin composite effectively removes fluoride from water. This material shows a higher defluoridation capacity than nano-hydroxyapatite alone, with potential for real-world applications.

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Area of Science:

Environmental Science
Materials Science
Water Treatment

Background:

Fluoride contamination in drinking water poses significant health risks.
Conventional water treatment methods for fluoride removal can be inefficient or costly.
Development of novel adsorbent materials is crucial for effective defluoridation.

Purpose of the Study:

To explore the fluoride adsorption potential of a novel nano-hydroxyapatite/chitin (n-HApCh) composite.
To characterize the n-HApCh composite and investigate the influence of various parameters on fluoride adsorption.
To compare the defluoridation capacity of n-HApCh with nano-hydroxyapatite (n-HAp).

Main Methods:

Characterization of the n-HApCh composite using Fourier-transform infrared (FTIR) spectroscopy.
Investigation of adsorption parameters including pH, interfering anions, and contact time.
Adsorption isotherm studies using Langmuir and Freundlich models.
Kinetic studies to determine the adsorption rate and mechanism.

Main Results:

The n-HApCh composite demonstrated significant fluoride adsorption capabilities.
Adsorption followed pseudo-second-order kinetics and pore diffusion patterns.
The defluoridation capacity of n-HApCh was found to be 2840 mg F(-)kg(-1), substantially higher than n-HAp (1296 mg F(-) kg(-1)).
Field trials were successfully conducted in a fluoride-endemic area.

Conclusions:

The n-HApCh composite is a highly effective adsorbent for fluoride removal from water.
Its superior defluoridation capacity makes it a promising material for water treatment applications.
The study supports the potential of n-HApCh for addressing fluoride contamination in endemic regions.