DSpace Collection: Journal of Molecular LiquidsJournal of Molecular Liquidshttp://localhost:8080/xmlui/handle/123456789/22332026-06-23T06:32:42Z2026-06-23T06:32:42ZAdsorptive removal of acid violet 17 dye from wastewater using biosorbent obtained from NaOH and H2SO4 activation of fallen leaves of Ficus racemosaJain, Suyog N.. Gogate, Parag Rhttp://localhost:8080/xmlui/handle/123456789/22342019-08-06T07:57:03Z2017-08-03T00:00:00ZTitle: 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 effectively2017-08-03T00:00:00Z