http://localhost:8080/xmlui/handle/123456789/325 Tue, 23 Jun 2026 06:26:44 GMT 2026-06-23T06:26:44Z http://localhost:8080/xmlui/handle/123456789/3817 Title: Ni(II) adsorption characteristics of commercial activated carbon from synthetic electroless plating solutions Mon, 02 Nov 2015 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3817 2015-11-02T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2891 Title: NaOH-treated dead leaves of Ficus racemosa as an efficient biosorbent for Acid Blue 25 removal Authors: Jain, S. N.; Gogate, P. R. Abstract: A novel biosorbent synthesized from Ficus racemosa leaves based on the treatment using NaOH was applied for removal of Acid Blue 25 from aqueous solution. The synthesized biosorbent was characterized using scanning electron microscopy, Fourier transform infrared spectroscopy and Brunauer–Emmett–Teller analysis. NaOH treatment was demonstrated to remove lignin content from the biomass and to induce the development of significant pores. Batch experiments were performed to evaluate the effect of important operating parameters such as pH (range of 2–10), biosorbent dose (range of 1–10 g/ L), contact time (range of 0–5 h), initial dye concentration (range of 50–400 mg/L) and temperature (range of 293–323 K) on the extent of removal of Acid Blue 25. The established optimum conditions were pH of 2, biosorbent dose of 4 g/L, contact time of 3 h and temperature of 323 K, yielding maximum removal of dye. Pseudo-secondorder model was found to best fit the kinetic data. Langmuir and Temkin isotherm models were found to best fit the equilibrium data. The obtained thermodynamic parameters confirmed endothermic and spontaneous nature of adsorption. The study established the utility of novel biosorbent for removal of Acid Blue 25 with higher adsorption capacities (83.33 mg/g) as compared to the more commonly used adsorbents. Desorption-adsorption studies conducted for seven cycles indicated potential reusability of synthesized biosorbent for the treatment of dye effluents. Tue, 31 May 2016 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2891 2016-05-31T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2224 Title: Fixed bed column study for the removal of Acid Blue 25 dye using NaOH-treated fallen leaves of Ficus racemosa Authors: Jain, Suyog N; Gogate*, Parag R. Abstract: The present study aims at evaluating the potential of adsorbent obtained from fallen leaves of Ficus racemosa with NaOH activation for Acid Blue 25 (AB 25) dye removal from aqueous solution in a continuous mode. The effect of various operating parameters such as bed height (2–6 cm), initial dye concentration (50–200 mg/L) and flow rate (6–10 mL/min) on the extent of dye removal has been investigated. The obtained results for the variation of operating parameters confirmed better column performance at higher bed height and lower flow rate. Different kinetic models such as Thomas, Adams–Bohart, Yoon–Nelson and bed depth service time (BDST) were applied to the obtained experimental data using column studies to predict the breakthrough curves and average mean square error has been employed to check the best suitability of the model. Thomas and BDST model predictions were established to be in better agreement with the experimental results. Maximum biosorption capacity for 100 mg/L of dye concentration present initially was obtained as 44.14 mg/g at optimum condition of 6 mL/min as the flow rate. The experimental observed capacity matched with the predicted biosorption capacity of 45.71 mg/g using the Thomas model. Elution studies conducted for seven cycles confirmed the reusability of synthesized biosorbent to treat industrial dye effluent in a column. Overall, the study clearly established the utility of synthesized biosorbent for the removal of AB 25 from wastewater in a continuous fixed bed adsorption process. Thu, 13 Jul 2017 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2224 2017-07-13T00:00:00Z