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Enhancement of Cr(VI) Ion Removal Using Nanochitosan Coated on Bituminous Activated Carbon
Author(s) -
Chooaksorn Wanida,
Nitisoravut Rachnarin,
Polprasert Chongrak,
Babel Sandhya,
Laohhasurayotin Kritapas,
Kangwansupamonkon Wiyong
Publication year - 2016
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/j.1554-7531.2016.tb00146.x
Subject(s) - adsorption , activated carbon , sorbent , chemistry , chemisorption , freundlich equation , kinetics , nuclear chemistry , reagent , langmuir adsorption model , chitosan , chemical engineering , inorganic chemistry , organic chemistry , physics , quantum mechanics , engineering
Bituminous activated carbon (AC) has been widely used as a sorbent for adsorption of non‐polar species, but its performance for removal of ionic species such as heavy metals has not been as efficient. In this study, AC was modified with chitosan nanoparticles (CN) using facile methods of dip coating and wet impregnation. The CN‐coated AC demonstrated an increase in Cr(VI) removal efficiency in both kinetics and adsorption capacity. The adsorption capacity of the CN‐coated AC (mg/g) was more than twice that of the uncoated AC (36.36 mg/g), or pure chitosan (32.57 mg/g). The sizes of the synthesized CN (160‐2,000 nm) can be controlled by varying the concentration of the chitosan/reagents used. The adsorption isotherms are better described using the Freundlich rather than the Langmuir model and are in agreement with the heterogeneity of the surfaces. Adsorption kinetics followed that of the pseudo‐second‐order kinetics, suggesting chemisorption as a rate limiting step.