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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Mar 2009, 29 (2)                                     Back


Ovarian development in Labeo dyocheilus (McClelland) during active

Removal of  fluoride by thermally activated carbon prepared from neem

(Azadirachta  indica)  and kikar (Acacia arabica)  leaves

Sunil Kumar1, Asha Gupta1 and J.P. Yadav*2

1Department of Environmental Science and Engineering, Guru Jambheshwar University, Hisar- 125 001, India

               2Department of Biosciences, M. D. University, Rohtak - 124 001, India

(Received: February 17, 2006 ; Revised received: July 19, 2006 ; Accepted: September 09, 2006)

Abstract: The present investigation deals with fluoride removal from aqueous solution by thermally activated neem (Azadirachta  indica) leaves carbon (ANC) and thermally activated kikar (Acacia arabica) leaves carbon (AKC) adsorbents. In this study, neem leaves carbon and kikar leaves carbon prepared by heating the leaves at 400oC in electric furnace was found to be useful for the removal of fluoride. The adsorbents of  0.3 mm and 1.0 mm sizes of neem and kikar leaves carbon was prepared by standard sieve. Batch experiments done to see the fluoride removal properties from synthetic solution of 5 ppm to study the influence of pH, adsorbent dose and contact time on adsorption efficiency. The optimum pH was found to be 6 for both adsorbents. The optimum dose was found to be 0.5g/100 ml for ANC (activated neem leaves carbon) and 0.7g/100 ml for AKC (activated kikar leaves carbon). The optimum time was found to be one hour for both the adsorbent. It was also found that adsorbent size of 0.3 mm was more efficient than the 1.0 mm size. The adsorption process obeyed Freundlich adsorption isotherm. The straight line of log (qe-q) vs time at ambient temperature indicated the validity of langergren equation consequently first order nature of the process involved in the present study. Results indicate that besides intraparticle diffusion there may be other processes controlling the rate which may be operating simultaneously. All optimized conditions were applied for removal of fluoride from four natural water samples.

 

Key words:Activated carbon, Fluoride removal, Neem leaves, Kikar leaves, Adsorbent

PDF of full length paper is available with author (yadav1964@rediffmail.com)

 

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