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Functionalized polyacrylamide/graphite composites - Biodegradable adsorbents for the removal of synthetic dye from aqueous solution

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Title Functionalized polyacrylamide/graphite composites - Biodegradable adsorbents for the removal of synthetic dye from aqueous solution
 
Creator Kumarasamy, Gayathri
Samiyappan, Sathishkumar
 
Subject Isotherm
Kinetics
Reactive red M5B
Polyacrylamide
Thermodynamics
 
Description 674-683
Eco friendly, biodegradable functionalized polyacrylamide/graphite composites have been used to adsorb synthetic dye
from aqueous medium. The polymer composites have been synthesized and characterized with FT-IR, 1H and 13C NMR.
The composite’s adsorptive features have been analyzed using different parameters. The efficiency of adsorption process is
determined using kinetic, equilibrium and thermodynamic analysis. The equilibrium uptake capacity was obtained from
Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich models. The correlation coefficients indicate that the Langmuir
model show satisfactory fit for the uptake of dye. The adsorption process follows pseudo second order in addition to
intraparticle diffusion model with a good correlation coefficient. The thermodynamic parameters ΔG, ΔH and ΔS show that
the adsorption process is spontaneous (ΔG < 0), endothermic (ΔH > 0) and had decreased entropy (ΔS > 0). The equilibrium
and kinetic experiments confirm that the temperature and pH play an important role i.e., the dye uptake increases with
increased temperature and decreased pH. FTIR and desorption studies confirm the involvement of functional groups in
adsorption mechanism.
 
Date 2022-02-02T11:59:43Z
2022-02-02T11:59:43Z
2021-11
 
Type Article
 
Identifier 0975-0991 (Online); 0971-457X (Print)
http://nopr.niscair.res.in/handle/123456789/59054
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJCT Vol.28(6) [November 2021]