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Magnetic-activated carbon composites derived from iron sludge and biological sludge for sulfonamide antibiotic removal
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Magnetic-activated carbon composites derived from iron sludge and biological sludge for sulfonamide antibiotic removal
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Journal Article
Magnetic-activated carbon composites derived from iron sludge and biological sludge for sulfonamide antibiotic removal
2020
Overview
Novel magnetic-activated carbon composites (MACs) were synthesized via coupling of a glucose-assisted hydrothermal pretreatment and subsequent thermal treatment using iron sludge and biological sludge. The adsorption properties of MACs for sulfonamide antibiotic removal from aqueous solution were investigated. Results revealed that the MACs had a high specific surface area with well-distributed magnetic nano-sized Fe
3
O
4
/Fe
0
particles with a graphitic shell. This finding indicates that the ferric compounds in the iron sludge were not only converted into magnetic ferrite but also worked as activators for graphitization of the surrounding amorphous carbon. The pseudo-second-order kinetics and Langmuir models were shown to well fit sulfonamide antibiotic adsorption on the MACs. There was a high correlation between the
k
l
·
q
m
and physicochemical parameters of the sulfonamides. The three parameters are molecular polarizability, octanol-water partition coefficient, and solubility, respectively. The sulfonamide adsorption by the MACs was highly pH dependent. Hydrophobic interaction, π-π interaction, as well as electrostatic interaction, played dominant roles in the sulfonamide adsorption.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
