High adsorption of methylene blue by activated carbon prepared from phosphoric acid treated eucalyptus residue

Activated carbon with large specific surface area (1545 m2·g−1) and total acid density (2.47 mmol·g−1) was prepared by thermal activation of phosphoric acid treated eucalyptus residue, and was successfully used for simulated dye wastewater treatment where it showed high methylene blue (MB) adsorptio...

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Published in:Powder technology Vol. 366; pp. 239 - 248
Main Authors: Han, Qiaoning, Wang, Jing, Goodman, Bernard A., Xie, Junkang, Liu, Zuguang
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 15.04.2020
Elsevier BV
Subjects:
Acids
Activated carbon
Activation
Adsorption
Carbon
Computer simulation
Dyes
Eucalyptus
Eucalyptus residue
Functional groups
Industrial wastewater
Mass ratios
Methylene blue
moieties
Particle diffusion
Phosphoric acid
powders
Residues
sorption isotherms
surface area
temperature
texture
wastewater
Wastewater treatment
Phosphoric acid
Eucalyptus residue
Adsorption
Activated carbon
Methylene blue
ISSN:0032-5910, 1873-328X
Online Access:Get full text
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Summary:Activated carbon with large specific surface area (1545 m2·g−1) and total acid density (2.47 mmol·g−1) was prepared by thermal activation of phosphoric acid treated eucalyptus residue, and was successfully used for simulated dye wastewater treatment where it showed high methylene blue (MB) adsorption capacity (977 mg·g−1). The textural properties and acidic functional groups of the activated carbon could be adjusted and controlled by phosphoric acid/eucalyptus residue mass ratios and activation temperature. Moreover, acidic functional groups could enhance MB adsorption by converting the adsorption pattern from planar to side adsorption with a decrease in activation temperature. The adsorption process was well described by the pseudo-second order kinetics and the Langmuir isotherm model, and it was demonstrated that intra-particle diffusion involved multi-linear stages. These findings provide important insights for the efficient treatment of dye wastewater on an industrial scale using waste eucalyptus residue. [Display omitted] •H3PO4 activated carbon was developed from waste eucalyptus residues.•The activated carbon has large specific surface area, high total acid density and yield.•The activated carbon has excellent adsorption performance to methylene blue.•The specific surface area and acidic functional groups play important role in adsorption capacity.•The adsorption pattern of methylene blue changed with the increase of acidic functional groups.
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ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2020.02.013