Debasish Sarkar

Bio: Debasish Sarkar is an academic researcher from University of Calcutta. The author has contributed to research in topics: Ultrafiltration & Mass transfer. The author has an hindex of 10, co-authored 41 publications receiving 357 citations.

Adsorptive Mass Transport of Dye on Rice Husk Ash

Abstract: Experimentations have been carried out to characterize the adsorption of Methylene Blue (MB) and Congo Red (CR) dyes in the aqueous phase onto Rice Husk Ash (RHA). Theoretically analyses are also made for describing the sorption and diffusion processes. The effective pore diffusivities of the dye molecules studied in RHA are determined by a suitable global optimization technique. The depth of penetration, on the other hand, has been estimated for various initial concentrations of dyes. Theoretically predicted concentration pro-files are compared with the experimental values at different initial concentrations of these dyes. Such com-parative studies indicate that the predicted values are in excellent agreement with the experimental values.

Proposed Adsorption–Diffusion Model for Characterizing Chromium(VI) Removal Using Dried Water Hyacinth Roots

Abstract: Experiments have been carried out to characterize the adsorption of chromium(VI) in the aqueous phase onto dried roots of water hyacinth. Results revealed a very high degree of removal efficiency (∼100%). Theoretical analyzes are also made for describing the sorption and diffusion processes. The effective pore diffusivity of chromium(VI) in the water hyacinth roots is determined by a suitable global optimization technique. The depth of penetration, on the other hand, has been estimated for various initial concentrations of chromium(VI). Theoretically predicted concentration profiles are in excellent agreement with the experimental values.

The Design and Analysis of Experiments

Abstract: THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

Rice Husk and Its Ash as Low-Cost Adsorbents in Water and Wastewater Treatment

Abstract: Rice husk, which is a relatively abundant and inexpensive material, is currently being investigated as an adsorbent for the removal of various pollutants from water and wastewaters. Various pollutants, such as dyes, phenols, organic compounds, pesticides, inorganic anions, and heavy metals can be removed very effectively with rice husk as an adsorbent. This article presents a brief review on the role of rice husk and rice husk ash in the removal of various pollutants from wastewater. Studies on the adsorption of various pollutants by rice husk materials are reviewed and the adsorption mechanism, influencing factors, favorable conditions, etc., discussed in this article. It is evident from the review that rice husk and its ash can be potentially utilized for the removal of various pollutants from water and wastewaters.

Magnetic Nanocarbon Adsorbents with Enhanced Hexavalent Chromium Removal: Morphology Dependence of Fibrillar vs Particulate Structures

Abstract: Fibrillar and particulate structure magnetic carbons (MCFs and MCPs) were prepared from the same precursor (polyacrylonitrile and Fe(NO3)3·9H2O) by using a different method, displaying a significant morphology dependence on wastewater treatment. TEM, SEM, XPS, TGA, etc. were systematically carried out to characterize the carbon samples to verify the morphology difference between these two kinds of carbon adsorbents. The results demonstrated that, along with the increase of the Fe(NO3)3·9H2O loading in the precursor from 10 to 40 wt %, the fibrillar nanoadsorbents displayed an improved activity from 12.6% to 51.4% Cr(VI) removal percentage with the initial Cr(VI) concentration at 4 mg/L. For the maximum removal capacity, the fibrillar sample (MCFs-40) demonstrated 3 times higher removing capacity (43.17 mg/g) than that of particulate nanoadsorbents (MCPs-40, 15.88 mg/g) for the Cr(VI) removal with pH at 1, demonstrating that the fibrillar sample was more favorable for the wastewater treatment than particul...