http://localhost:8080/xmlui/handle/123456789/248 2026-06-23T06:30:02Z http://localhost:8080/xmlui/handle/123456789/2940 Title: Adsorptive removal of azo dye in a continuous column operation using biosorbent based on NaOH and surfactant activation of Prunus Eulcis leaves Authors: Jain, S. N.; Gogate, P. R. Abstract: The adsorption of Acid Blue 113, an azo dye, from aqueous solution using biosorbent obtained from NaOH and surfactant activation of waste biomass of Prunus dulcis has been studied in the present work in column operation. The effect of various operating conditions as depth of biosorbent in the bed, influent concentration, flow rate and salt concentration on the extent of adsorption and the breakthrough characteristics have been investigated. The obtained breakthrough data was applied to different models to check the fitting using linear and nonlinear regression analysis also obtaining the model parameters for best fitting models. Error analysis using root mean square error function was performed to predict the best model fitting in terms of matching experimental values to model predicted values, closer values of correlation coefficient to unity and least error values. Yoon Nelson and Thomas models were found to be in better agreement to the obtained breakthrough data. Maximum uptake capacity was established as 59.54 mg/g for the operation with 100 mg/L as the influent dye concentration at the established optimum flow rate of 6 mL/min. Desorption and subsequent re-usability studies conducted for three cycles using ethanol as the desorbing agent confirmed the effectiveness of synthesized biosorbent for dye removal in multiple cycles as only slight decrease in biosorption capacity was observed from 52.50 mg/g for first cycle to 49.42 mg/g for third cycle of reuse. Extent of elution (%) was also found to marginally decrease from 98.59% for first cycle to 83.81% for third cycle of reuse. Overall, the column study clearly established that synthesized biosorbent is a promising adsorbent to treat Acid Blue 113 containing dye effluent in a continuous operation. 2018-11-17T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2886 Title: Acid Blue 113 removal from aqueous solution using novel biosorbent based on NaOH treated and surfactant modified fallen leaves of Prunus Dulcis Authors: Jain, S. N.; Gogate, P. R. Abstract: In the present work, the fallen leaves of Prunus Dulcis (almond) have been used for obtaining biosorbent with activation based on NaOH and surfactant treatment. Characterization of biosorbent was performed using Fourier transform infrared spectroscopy, scanning electron microscopy, elemental analysis and Brunauer–Emmett–Teller analysis techniques. The obtained biosorbent was subsequently applied for removal of azo dye, Acid Blue 113, from aqueous solution. The effects of biosorbent dose, contact time, initial dye concentration, salt concentration and temperature on the extent of adsorption of AB 113 were investigated in batch mode. The optimum conditions obtained for maximum dye removal were biosorbent dose of 10 g L−1 for NaOH treated biosorbent and 3gL−1 for surfactant modified biosorbent, contact time of 2.5 h and temperature of 293 K. Better results were obtained for surfactant modified biosorbent (almost 100% removal) as compared to the NaOH activated biosorbent. The adsorption kinetics data were found to be well described by pseudo-second order equation whereas Langmuir and Temkin isotherm models were observed to be best fitted to the obtained equilibrium data. The adsorption was found to be exothermic and spontaneous in nature. Maximum biosorption capacity obtained under optimized conditions were 10.87, 25.51 and 97.09 mg g−1 for conventionally obtained biosorbent, NaOH treated biosorbent and surfactant modified biosorbent respectively. Regeneration studies and subsequent application demonstrated potential of the biosorbent for dye removal in more than one cycle. The present study conclusively established the potential of surfactant modified biosorbent for effective removal of Acid Blue 113 dye with significantly higher biosorption capacity of 97.09 mg g−1 in comparison with other commonly used adsorbents. 2017-06-27T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2234 Title: Adsorptive removal of acid violet 17 dye from wastewater using biosorbent obtained from NaOH and H2SO4 activation of fallen leaves of Ficus racemosa Authors: Jain, Suyog N.; . Gogate, Parag R Abstract: Biosorbents obtained from NaOH and H2SO4 activation of fallen leaves of Ficus racemosa were used for the adsorptive removal of Acid Violet 17 dye from wastewater. BET, SEM and FTIR techniques were used for the characterization of biosorbent. Batch studies were conducted to study the effect of various operating parameters on the extent of adsorption of dye. Maximum dye removal was obtained under optimized conditions of pH as 2 and 3 g/L of biosorbent dose for NaOH activated biosorbent whereas lower extent of removal was obtained for H2SO4 activated biosorbent under similar conditions. The obtained kinetic datawere best fitted to pseudo-second order model whereas the adsorption equilibrium data was observed to be in good agreement with Langmuir model. Maximum Langmuir biosorption capacities were estimated to be 45.25, 61.35 and 119.05 mg/g for raw biosorbent, H2SO4 activated biosorbent and NaOH activated biosorbent respectively. The obtained thermodynamic data confirmed that adsorption was endothermic whereas the obtained activation energy as 7.07 kJ/mol confirmed physical nature of the adsorption. Column studies were also performed to establish the practical applicability of the synthesized biosorbentwith understanding into effect of biosorbent bed height, initial dye concentration and flow rate. The columndata for the equilibriumadsorptionwas observed to best fit Thomasmodel. Maximum biosorption capacity obtained in continuous mode under the optimized conditions was 69.08 mg/g. Batch and column desorption studies performed for five cycles established effectiveness and the reusability of synthesized biosorbent to treat industrial dye effluent effectively 2017-08-03T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2232 Title: Efficient removal of Acid Green 25 dye from wastewater using activated Prunus Dulcis as biosorbent: Batch and column studies Authors: Jain, Suyog N.; . Gogate, Parag R Abstract: Biosorbent synthesized from dead leaves of Prunus Dulcis with chemical activation during the synthesis was applied for the removal of Acid Green 25 dye from wastewater. The obtained biosorbent was characterized using Brunauer-Emmett-Teller analysis, Fourier transform-infrared spectroscopy and scanning electron microscopy measurements. It was demonstrated that alkali treatment during the synthesis significantly increased surface area of biosorbent from 67.205 to 426.346 m2/g. The effect of various operating parameters on dye removal was investigated in batch operation and optimum values of parameters were established as pH of 2, 14 g/L as the dose of natural biosorbent and 6 g/L as the dose of alkali treated biosorbent. Relative error values were determined to check fitting of obtained data to the different kinetic and isotherm models. It was established that pseudo-second order kinetic model and Langmuir isotherm fitted suitably to the obtained batch experimental data. Maximum biosorption capacity values were estimated as 22.68 and 50.79 mg/g for natural biosorbent and for alkali activated Prunus Dulcis, respectively. Adsorption was observed as endothermic and activation energy of 6.22 kJ/mol confirmed physical type of adsorption. Column experiments were also conducted to probe the effectiveness of biosorbent for practical applications in continuous operation. Breakthrough parameters were established by studying the effect of biosorbent height, flow rate of dye solution and initial dye concentration on the extent of dye removal. The maximum biosorption capacity under optimized conditions in the column operation was estimated as 28.57 mg/g. Thomas and Yoon-Nelson models were found to be suitably fitted to obtained column data. Reusability study carried out in batch and continuous column operations confirmed that synthesized biosorbent can be used repeatedly for dye removal from wastewater. 2018-01-04T00:00:00Z