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Experimental Investigations and Theoretical Modeling Aspects in Column Studies for Removal of Cr(VI) from Aqueous Solutions Using Activated Tamarind Seeds  [PDF]
Suresh Gupta, B. V. Babu
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.28081
Abstract: Continuous adsorption experiments are conducted using fixed-bed adsorption column to evaluate the performance of the adsorbent developed (from activated tamarind seeds) for the removal of Cr(VI) from aqueous solutions and the results obtained are validated with a model developed in this study. The effects of significant parameters such as flow rate, mass of adsorbent, and initial Cr(VI) concentration are studied and breakthrough curves are obtained. As the flow rate increases from 10 to 20 mL min-1, the breakthrough time decreases from 210 to 80 min. As the mass of adsorbent increases, breakthrough time gets delayed. The breakthrough times are obtained as 110, 115 and 210 min for 15, 20 and 25 g of activated tamarind seeds. As the initial Cr(VI) concentration increases from 100 to 200 mgL-1, the break point time decreases from 210 to 45 min. The process parameters for fixed-bed adsorption such as breakthrough time, total percentage removal of Cr(VI), adsorption exhaustion rate and fraction of unused bed length are calculated and the performance of fixed-bed adsorption column is analyzed. The mechanism for Cr(VI) adsorption on activated tamarind seeds is proposed. At low value of solution pH (= 1), the increase in Cr(VI) adsorption is due to the electrostatic attraction between positively charged groups of activated tamarind seeds and the HCrO4-. A mathematical model for fixed-bed adsorption column is proposed by incorporating the effect of velocity variation along the bed length in the existing model. Pore and surface diffusion models are used to describe the intra-particle mechanism for Cr(VI) adsorption. The breakthrough curve obtained theoretically from pore diffusion model and surface diffusion model are compared with experimental results for different operating conditions. The standard deviation values obtained for pore diffusion model and solid diffusion model are 0.111 and 0.214 respectively.
Laboratory markers associated with progression of HIV infection
Gupta V,Gupta S
Indian Journal of Medical Microbiology , 2004,
Abstract: Infection with HIV may develop to AIDS at different rates in different individuals, with a spectrum varying from rapid progression to long term non-progression. The variable course of HIV-1 infection causes emotional trauma for the infected person and complicates the design and interpretation of therapeutic trials because of unrecognized differences in prognosis. Thus it is essential to have tests which can accurately assess the stage of infection in an individual, as well as predict its course and monitor its progression. These laboratory tests are very valuable during the period of clinical latency and subsequently supplement various clinical parameters.
IJGP gets ICV
Gupta V
International Journal of Green Pharmacy , 2009,
Abstract:
Can we put IJGP on the track?
Gupta V
International Journal of Green Pharmacy , 2009,
Abstract:
Academia-Industry Interaction Database, Editorial Board Nominations
Gupta V
International Journal of Green Pharmacy , 2009,
Abstract:
India needs innovations in post harvesting
Gupta V
International Journal of Green Pharmacy , 2009,
Abstract:
IJGP 2008
Gupta V
International Journal of Green Pharmacy , 2008,
Abstract:
New look, new TRP!
Gupta V
Asian Journal of Pharmaceutics , 2008,
Abstract:
The third occurrence of plagiarism
Gupta V
Asian Journal of Pharmaceutics , 2009,
Abstract:
Seeking your advice
Gupta V
Asian Journal of Pharmaceutics , 2009,
Abstract:
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