DSpace Collection:http://localhost:8080/xmlui/handle/123456789/29312026-06-23T06:32:45Z2026-06-23T06:32:45ZRemoval of pyridine using ultrasound assisted and conventional batch adsorption based on tea waste residue as biosorbentDaware, Gaurav B.Gogate, Parag R.http://localhost:8080/xmlui/handle/123456789/30502021-10-11T08:42:57Z2020-12-05T00:00:00ZTitle: Removal of pyridine using ultrasound assisted and conventional batch adsorption based on tea waste residue as biosorbent
Authors: Daware, Gaurav B.; Gogate, Parag R.
Abstract: The current study deals with comparison of ultrasound assisted adsorption and conventional batch adsorption using biosorbent based on tea waste residue (TWR) with
an objective to develop novel treatment approach for effective removal of pyridine.
The characterization of TWR was performed using FTIR and SEM to get clear insight
into the associated functional groups and the morphology. In addition, point of zero
charge was also established and oxygen functional groups were detected using Boehm
titration method. Ultrasound assisted adsorption was studied in ultrasonic bath (25 kHz
frequency) under varying conditions of pH (2–10), TWR dose (0.5–4 g/L) treatment time
(0 to 120 min for ultrasound assisted and 0 to 200 min for conventional approach),
temperature (283 K–313 K), power (15 W–150 W) and initial concentration (10 mg/L–
150 mg/L). Maximum removal and pyridine uptake obtained for ultrasound assisted
adsorption was 98.2% and 37.38 mg/g respectively at optimized conditions of pH of 6,
TWR loading of 2.5 g/L, temperature of 303 K, treatment time of 90 min and power of
120 W. Conventional batch adsorption studies performed at fixed 150 rpm as shaking
speed revealed that maximum removal and maximum pyridine uptake was obtained as
92.25% and 33.72 mg/g respectively under similar optimum conditions but in treatment
time of 160 min required to reach equilibrium. Pseudo second order kinetic model was
the best fit for both adsorption approaches. Langmuir adsorption isotherm model for
conventional batch adsorption and both Langmuir and Temkin isotherm for ultrasound
assisted adsorption were also found suitable. Thermodynamic parameters as ∆G, ∆H
and ∆S were evaluated for both adsorption approaches and it was established that
the ∆G and ∆S values for ultrasound assisted adsorption for all temperatures and
isotherms are higher compared to conventional batch adsorption. Overall, ultrasound
was demonstrated as effective means to improve adsorption leading to enhanced extent
of adsorption and lower treatment time.2020-12-05T00:00:00Z