http://localhost:8080/xmlui/handle/123456789/411 Tue, 23 Jun 2026 06:26:55 GMT 2026-06-23T06:26:55Z http://localhost:8080/xmlui/handle/123456789/3052 Title: Sonochemical degradation of 3-methylpyridine (3MP) intensified using combination with various oxidants Authors: Daware, Gaurav B.; Gogate, Parag R. Abstract: 3-Methyl pyridine (3MP) is a toxic and hazardous organic compound having considerable negative impact on environment and living organisms. The objective of this work to report a novel treatment strategy based on sonochemical degradation of 3MP, in combination with oxidants such as hydrogen peroxide, Fenton’s reagent, peroxymonosulphate (PMS), and potassium persulphate (KPS) as well as solar irradiations. A bath sonicator operating at 25 kHz frequency and rated power dissipation of 100 W was applied in the work to study different approaches with an objective to enhance the removal of 3MP in lesser time. Effect of operating parameters such as pH (over the range of 2–10), treatment time, temperature (25–55 °C) and ultrasonic power (25 W to 150 W) on the degradation has been studied and the best conditions were used in subsequent combination approaches. It was demonstrated that ultrasound in combination with PMS, ferrous sulphate (FeSO4) and solar irradiations (approach of US/PMS/FeSO4/solar irradiation) is the best treatment strategy yielding maximum degradation as 97.4% with highest cavitational yield as 1.920 × 10−4 mg/J and highest synergetic Index as 2.70. Kinetic analysis revealed that first order mechanism fitted well to all the approaches involving different combinations of ultrasound, oxidising agents and solar irradiation. Degradation products were also analysed that established the degradation mechanism as C2 and C3 ring cleavages forming 1, 4-dihydro3-methylpyridine followed by Levulinic acid as non -toxic main by-product. Overall the work clearly demonstrated an effective treatment approach involving combined sonication with oxidants for remediation of 3MP also providing insights on kinetics and mechanism of degradation. Thu, 02 Apr 2020 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3052 2020-04-02T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3047 Title: Adsorption of 3-Aminopyridine (3AP) from aqueous solution using sugarcane bagasse activated carbon (SBAC) Authors: Daware, Gaurav B.; Gogate, Parag R. Abstract: Adsorption of 3-Aminopyridine (3AP) from simulated effluent using sugarcane bagasse activated carbon (SBAC) was studied based on batch and continuous operations. Characterization of synthesized SBAC was performed initially using BET and SEM analysis. Different batch experiments were performed to understand the effect of operating parameters such as initial concentration, pH, SBAC dose, time and temperature to understand the effect on the extent of adsorption. The maximum adsorption capacity for batch adsorption was established as 54.4 mg/g whereas the maximum extent of removal was 97.6 % under optimized conditions. The observed data at equilibrium was found to be best fitted to Freundlich and Langmuir adsorption isotherms. Kinetic study revealed that pseudo-second order mechanism prevailed. Desorption of 3AP using ethanol showed good reuse efficacy for five cycles. Column adsorption experiments were also performed under varying SBAC bed height, concentration of 3AP and volumetric flow rate of 3AP solution to determine the breakthrough parameters. The fitting of the Yoon–Nelson and Thomas adsorption models to the obtained breakthrough data was studied and found to be satisfactory. Maximum adsorption capacity of SBAC for adsorption of 3AP in continuous operation was established as 65.6 mg/g. The obtained results demonstrated very good performance of SBAC for effective removal of 3AP in both batch and column operations. Sat, 23 May 2020 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/3047 2020-05-23T00:00:00Z http://localhost:8080/xmlui/handle/123456789/2818 Title: Treatment of Dye Containing Real Industrial Efuents using NaOH‑Activated Ficus racemosa and Prunus dulcis based Novel Adsorbents Authors: Jain, S. N.; Gogate, P. R. Abstract: The present study aims at evaluating the potential of synthesized biosorbents using NaOH-activated dead leaves of Ficus racemosa (NTFR) and Prunus dulcis (NTPD) for the treatment of real industrial efuents containing dyes. Kinetic and isotherm studies have been performed to establish the important design-related information for the treatment of industrial efuent using synthesized biosorbents. The extent of dye removal obtained as 99.19% for the studies involving pure dye solution of Acid Blue 25 dye with 50 mg L−1 as initial concentration using NTFR biosorbent was found to decrease marginally to 96.72% in the case of real efuent with similar dye loading and under similar operating conditions. Biosorption capacity for the case of pure Acid Blue 25 dye solution obtained as 83.33 mg g−1 also marginally decreased to 80.65 mg g−1 for the industrial efuent. Similarly, for the case of Acid Green 25 dye, extent of dye removal obtained as 92.09% was found to decrease to 84.51% in the case of mixed industrial efuent. In this case, reduction in chemical oxygen demand (COD) was also measured and compared with that of pure Acid Green 25 dye solution. COD reduction was obtained as 53.97% at the optimized dose of 18 g/L of NTPD for mixed industrial efuent which was lower than 92.05% obtained at the optimized biosorbent dose for pure Acid Green 25 dye solution. Langmuir and pseudo-second-order model ftted well to the obtained data in the present study. The obtained results confrmed potential of synthesized biosorbents for removal of dyes from industrial efuent and also established the infuence of other compounds present in the industrial efuent on removal rate of individual dyes. Sun, 17 Feb 2019 00:00:00 GMT http://localhost:8080/xmlui/handle/123456789/2818 2019-02-17T00:00:00Z