Papers by Bhaskar Sengupta
International Journal of Environmental Science and Technology, 2013
An environment friendly arsenic removal technique from contaminated soil with high iron content h... more An environment friendly arsenic removal technique from contaminated soil with high iron content has been studied. A natural surfactant extracted from soapnut fruit, phosphate solution and their mixture was used separately as extractants. The mixture was most effective in desorbing arsenic, attaining above 70 % efficiency in the pH range of 4-5. Desorption kinetics followed Elovich model. Micellar solubilization by soapnut and arsenic exchange mechanism by phosphate are the probable mechanisms behind arsenic desorption. Sequential extraction reveals that the mixed soapnut-phosphate system is effective in desorbing arsenic associated with amphoteric-Fe-oxide forms. No chemical change to the wash solutions was observed by Fourier transform-infrared spectra. Soil:solution ratio, surfactant and phosphate concentrations were found to affect the arsenic desorption process. Addition of phosphate boosted the performance of soapnut solution considerably. Response surface methodology approach predicted up to 80 % desorption of arsenic from soil when treated with a mixture of &1.5 % soapnut, &100 mM phosphate at a soil:solution ratio of 1:30.
Crystal Research and Technology, 1999
ABSTRACT
Crystal Research and Technology, 1999
This work deals with the transient analysis of crystal size distribution (CSD) for imperfectly mi... more This work deals with the transient analysis of crystal size distribution (CSD) for imperfectly mixed draft tube baffled (DTB) and forced circulation (FC) crystallizers. The DTB and FC crystallizers are described by the Compartmental and Mixed models respectively. Monte Carlo (MC) scheme has been employed for simulation purposes. The simulation results have been compared with the available experimental data of
Desalination and Water Treatment, 2015
Technical feasibility of natural iron-rich sandy soil as a low-cost adsorbent for removal of lead... more Technical feasibility of natural iron-rich sandy soil as a low-cost adsorbent for removal of lead from water was investigated. The soil, which had an iron content of 3,719 mg/kg, was collected from Hulu Langat, Malaysia, and was used for adsorption studies without any surface modification through chemical treatment. The effects of pH, solution: soil ratio and initial lead concentration on the adsorption efficiency were studied using response surface methodology based on Box-Behnken experimental design. The results showed that pH of the solution had the highest impact on the adsorption efficiency whereby adsorption efficiency of 97% could be achieved at pH 3.5-5. The experimental data were also checked for compliance with different kinetic models and adsorption isotherms. The adsorption process was found to be rapid monolayer chemisorption with adsorption capacity of 0.9-1.0 mg/g, as it fitted Langmuir isotherm and followed pseudo-second-order kinetic model.
Journal of Contaminant Hydrology, 2016
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Papers by Bhaskar Sengupta