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Articles by S. Maitra
Total Records ( 3 ) for S. Maitra
  B. Shimekit , H. Mukhtar and S. Maitra
  Different well-known gas permeation theoretical models such as Maxwell model, Bruggeman model, Lewis-Nielson model, Pal model, Felske model and modified Felske model has been discussed for prediction of the relative permeability of CO2 in Matrimid® 5218-Carbon Molecular Sieve (CMS) Mixed Matrix Membranes (MMMs). For evaluation of the theoretical models, experimental data of relative permeability for CO2 in Matrimid® 5218-Carbon Molecular Sieve (CMS) mixed matrix membrane were compared with the prediction of the theoretical models for the relative permeability of CO2 in ideal and rigidified interfacial morphology of the mixed matrix membrane. Comparison of those models was carried out based on the widely used model validation criteria including absolute average relative error percent and standard deviation. For the models evaluated under ideal morphology, the results showed a decrease in the absolute average relative error percent and standard deviation in the following order: Pal model > Lewis-Nielsen model > Maxwell model > Bruggeman model. For other models evaluated considering the presence of rigidified interfacial morphology, the absolute average relative error percent and standard deviation showed a decrease in the order, Felske model > modified Felske model. Hence, the modified Felske model was found to be in a better agreement with experimental data for prediction of relative permeability CO2 in Matrimid® 5218-CMS mixed matrix membrane.
  A. Mesfin Yeneneh , S. Maitra and Usama Eldemerdash
  Heavy metal laden effluent coming out of various industries is posing a huge pressure on the environment. This in turn, necessitates the development of a noble low cost and efficient technology for the removal of such wastes from industrial effluents. In this particular research, the heavy metal (lead (II) biosorption capacity of modified agri-waste (rice husk and sugarcane bagasse) has been studied, taking the two biosorbents as abundant and low cost biosorbents with promising potential to remove hazardous heavy metal wastes from effluent streams. In the study, options to enhance metal sorption capacity by chemical and thermal modification of the sorbents have been investigated. Impact of modifier chemicals used include sodium hydroxide, sulfuric acid, nitric acid, citrc acid, acrylic acid and glutamic acid in case of rice husk and modifiers like Sodium Dodecyl Sulfate (SDS), Sodium bicarbonate, Cetyl trimethyl diammonium bromide (CTAB), sodium methylate and urea, in case of sugar cane bagasse in addition to those used with rice husk. Characterization of the sorbents surfaces has been made before and after chemical and thermal modification and after sorption of heavy metals using Fourrier Transform Infra-Red Spectroscopy (FTIR) and Scanning Electron Microscope (SEM). Some studies have also been done on mechanism of sorption. In addition impact of concentration of sodium hydroxide and citric acid as effective chemical modifier has been studied. Tests to understand impact of particle size have also been conducted and results for the two biosorbents have been compared.
  S Gowrishankar , A Patro and S. Maitra
 

We report a case of a 38-year-old male with acute renal failure, elevated anti-glomerular basement membrane (anti-GBM) antibody titres, bilateral nodular lung opacities and hypertension. In the renal biopsy examination, whereas direct immunofluorescence revealed significant peripheral linear deposits of IgG typical of anti-GBM antibody disease (Goodpasture's disease), eosin–haemotoxylin staining showed glomerular and vascular changes typical of thrombotic microangiopathy (TMA) and without crescents. We postulate that the TMA was responsible for the acute renal failure and that antibodies, though demonstrable, were not adequate at the site of the glomerular basement membrane to elicit a crescentic response, because of occlusion of the vascular lumina by the thrombotic process. The patient remained dialysis dependent at a 3-month follow-up.

 
 
 
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