期刊
CHEMICAL ENGINEERING COMMUNICATIONS
卷 205, 期 11, 页码 1555-1567出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00986445.2018.1460598
关键词
Adsorption; Characterization; Chitosan; Cross-linking; Pb(II); Thermodynamics
资金
- Department of Chemical Engineering, University of Engineering and Technology Lahore
In this study, chitosan was chemically modified with only diammonium phosphate (DAP) and DAP/EDTA (ethylenediaminetetraacetic acid) mixture for the removal of Pb(II) ions from aqueous solution. Modified chitosan forms were analyzed using thermo-gravimetric analyzer (TGA), Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM) to investigate the thermal degradation behavior, structural modifications, and the surface texture of the cross-linked chitosan adsorbents, respectively. The adsorption results were analyzed by well-known kinetic and isotherm models. The kinetics of metal adsorption followed the pseudo-second-order model. The maximum sorption capacities obtained from the Langmuir isotherm model were 126mg/g for diammonium phosphate-modified Chitosan (DMC) and 137mg/g for DAP/EDTA-modified chitosan (EDMC). The thermodynamic analysis showed that the metal removal process was endothermic in nature.
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