http://nopr.niscpr.res.in/handle/123456789/59569 Sat, 10 Oct 2026 23:20:52 GMT 2026-10-10T23:20:52Z http://nopr.niscpr.res.in/handle/123456789/59582 Title: Effects of operating variables in adsorption for azo textile dye from wastewater: Optimization of process parameters by Box-Behnken design of RSM: Isothermal and kinetic studies Authors: Upender, H; Tadepalli, Srinivas; Afzal, Asif Abstract: The removal of dye from azo textile dye using raw wheat bran adsorbent prepared by coating on low-density Polypropylene (PP) particles has been studied by batch experimental studies. The batch adsorption studies have been performed for 36 h. Box–Behnken design of response surface methodology (RSM) is utilized to ascertain the impact of initial concentration, adsorbent dose, and pH on the removal of dye. The data obtained from experimental parameters have been analyzed through the fitting of kinetic models such as Pseudo-first order, Pseudo second-order model, Intraparticle diffusion, and Elovich model for dye removal along with correlation or regression coefficient (R2) values. The statistical analyses of the results collected in reaction kinetic modeling portray the superiority of the Pseudo second-order model for both dye removal. In the dye removal, the higher R2 values are seen in case of better suitability of the Pseudo second-order model. The isotherms of adsorption experiments have been performed by employing different adsorption isotherm models such as Dubinin–Radushkevich, and Halsey. It is observed that both isotherms reflect the equilibrium data for dye removal. Page(s): 9-22 Sat, 01 Jan 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/59582 2022-01-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/59581 Title: Magnetic nano carbon balls - Synthesis and adsorption studies Authors: V, Kumaravelan; B, Murugesan; P, Sivakumar Abstract: Madhuca longifolia oil used as precursor oil for the synthesis of nano sized carbon balls with a size of 50 to 100 nm. An indigenously designed reactor assembly is used for this synthesis. Low temperature direct pyrolysis method is employed with the help of multi-metal catalyst derived from Alternanthera sessilis stem ash. The synthesized carbon balls have a bulk density of 0.124 g/mL and BET surface area of 805.87 m2/g. In-order to ensure the effective recovery of NCB, it is immobilized with a magnetic nano particle Fe3O4 and used for the adsorption studies of Acid Green 25 dye from aqueous solution under batch mode. Batch mode studies also proved the endothermic nature and physisorption mechanisms. The maximum Langmuir monolayer capacity of 243.90 mg/g has been achieved at a temperature of 45°C. Page(s): 23-31 Sat, 01 Jan 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/59581 2022-01-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/59580 Title: Preparation and antimicrobial activity of CS/PVA membranes containing silver nitrate Authors: Koseoglu, Tugba Sardohan; Coban, Esin Poyrazoglu; Kır, Esengul; Sahin, Selmihan; Biyik, Haci Halil; Ozmen, Ismail Abstract: Chitosan/polyvinyl alcohol (CS/PVA) membranes containing silver nitrate have been prepared and investigated for antimicrobial properties of prepared membranes. CS/PVA membranes containing silver nitrate have been successfully prepared by solution casting method. The prepared membranes have been characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction analysis (XRD) methods. The elemental composition of the membranes is studied by energy dispersive analysis of SEM-EDX. Correspondingly, the EDX analysis confirms the presence of silver ions in the chitosan matrix. The antimicrobial activities of the membranes have been tested with wide spectrum of bacteria. Efficiency of the antimicrobial effect against the selected twelve bacteria type and two yeasts is measured by disc diffusion method. Effect of the concentration of silver solutions to the developed CS/PVA membranes was investigated. It is noticed that the antimicrobial activity of membranes is improved with the increased silver concentration as a bactericidal agent, as expected. Our observations suggest that Chitosan/polyvinyl alcohol/Ag (CS/PVA/Ag) membranes have an excellent antimicrobial effect. Thus, developed membranes can easily be applied in various fields such as biomedical sector, tissue engineering and water treatment sector. Page(s): 32-39 Sat, 01 Jan 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/59580 2022-01-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/59579 Title: Modeling and gPROMS based simulation of adsorption process for the removal of Cu (II) from aqueous wastewater Authors: Gaikwad, R W; Urgunde, Ajay B; Hakke, Vikas S; Sonawane, Shirish H; Warade, A R Abstract: The present work studies the performance of Indion 730 (Strong acid) ion exchange resin for the removal of Cu (II). The modeling and gPROMS based simulation is used to study the sorption capacity, equilibrium, and performances of Indion 730 ion exchange resin. The extraction effectiveness of the resin is studied by using breakthrough curves. The experimental and simulation results were compared. A numerical model is proposed for the investigation of the ion exchange phenomenon using gPROMS using various optimized parameters like flow rate, bed height, and initial concentration of wastewater containing Cu (II) heavy metal ion in the column. For instance, the effects of flow rate, bed height, and inlet concentration of heavy metal on a breakthrough curve are investigated in depth. The results illustrate that the predicted theoretical breakthrough curves show analogous patterns with the corresponding investigational output with a discrepancy of the equilibrium time. The predictions of the model will help to discover the optimal conditions of operation. Page(s): 40-46 Sat, 01 Jan 2022 00:00:00 GMT http://nopr.niscpr.res.in/handle/123456789/59579 2022-01-01T00:00:00Z