The effects of solution pH and temperature on the adsorption of fluoride onto bone char made from cattle bones were investigated in this work. It was found that the maximum adsorption took place at pH 3 and the adsorption capacity decreased nearly 20 times augmenting the pH from 3 to 12. This behavior was attributed to the electrostatic interactions between the surface of bone char and the fluoride ions in solution. The adsorption capacity was not influenced by temperature in the range from 15 to 35 °C. A comparison of fluoride adsorption capacities among several adsorbents revealed that the adsorption capacity of the bone char was 2.8 and 36 times greater than those of a commercial activated alumina (F-1) and a commercial activated carbon (F-400). The adsorption capacity is considerably dependent upon the physicochemical properties of the bone char surface and the solution pH.

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Adsorption of Fluoride from Water Solution on Bone Char

Fluoride removal from water by adsorption—A review

Fluoride in drinking water and defluoridation of water.

Adsorption of fluoride in aqueous solutions using KMnO4-modified activated carbon derived from steam pyrolysis of rice straw.

Water is precious to us, as it supports every spheres of human life. The increasing reports on pollution of this “sacred resource” from different sources show our scant regard to this pivotal issue. People in more than 35 nations across the globe face issues of excess fluoride in drinking water, the intensity and severity of which varies with the environmental settings in terms of their geographical and economical status. It has been observed that very few proven sustainable options are available for fluoride removal, especially in developing countries, where the impact of the issue is highly intense. Though the considerable amount of research undertaken worldwide has thrown up many technologies, each having its own advantages and limitations, a lasting solution is still at large. The coagulation and adsorption/ion-exchange processes are the most widely opted defluoridation techniques practiced in fluoride-endemic areas. The Nalgonda technique and adsorption by bone char, or a combination of both, have be...

Chunxiang Yu

Papers

Adsorption of fluoride from aqueous solution on La3+-impregnated cross-linked gelatin