Porous carbon with high surface area was synthesized from different tea precursors under
thermochemical condition in presence of phosphoric acid as activating agent. The synthetic procedure
was optimized under different condition of acid impregnation ratio, heating temperature, dwelling time,
etc. Pore morphology, surface properties, crystalline nature and thermal stability of porous carbon (PC)
were assessed by using BET, SEM, FTIR, XRD and TGA analysis. Under optimized synthetic condition, the
maximum surface area of the carbon material was found to be 2054.49 m2 g1 with a total pore volume of
1.747 cm3 g1
. Adsorption characteristics of the PC for removal of a cationic dye (methylene blue) and an
anionic dye (eosin yellow) were investigated spectrophotometrically as a function of initial dye
concentration and contact time, adsorbent dosage, solution pH and temperature, etc. The PC was found to
be equally efficient for removal of both the dyes from aqueous solutions at neutral pH with adsorption
performance of greater than 99%. The equilibrium adsorption data of both the dyes could be described
well by the Langmuir isotherm equation. The maximum adsorption capacity for methylene blue and
eosin yellow was found to be 402.25 mg g1 and 400 mg g1
, respectively. The adsorption kinetics in case
of both the dyes follows a pseudo-second-order pathway. Investigations on thermodynamic parameters
in the temperature range of 303–323 K revealed that the adsorption process is spontaneous and
endothermic in nature.
Porous carbon with high surface area was synthesized from different tea precursors underthermochemical condition in presence of phosphoric acid as activating agent. The synthetic procedurewas optimized under different condition of acid impregnation ratio, heating temperature, dwelling time,etc. Pore morphology, surface properties, crystalline nature and thermal stability of porous carbon (PC)were assessed by using BET, SEM, FTIR, XRD and TGA analysis. Under optimized synthetic condition, themaximum surface area of the carbon material was found to be 2054.49 m2 g1 with a total pore volume of1.747 cm3 g1. Adsorption characteristics of the PC for removal of a cationic dye (methylene blue) and ananionic dye (eosin yellow) were investigated spectrophotometrically as a function of initial dyeconcentration and contact time, adsorbent dosage, solution pH and temperature, etc. The PC was found tobe equally efficient for removal of both the dyes from aqueous solutions at neutral pH with adsorptionperformance of greater than 99%. The equilibrium adsorption data of both the dyes could be describedwell by the Langmuir isotherm equation. The maximum adsorption capacity for methylene blue andeosin yellow was found to be 402.25 mg g1 and 400 mg g1, respectively. The adsorption kinetics in caseof both the dyes follows a pseudo-second-order pathway. Investigations on thermodynamic parametersin the temperature range of 303–323 K revealed that the adsorption process is spontaneous andendothermic in nature.
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