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Environ Sci Pollut Res Int. 2017 Sep;24(26):21484-21495. doi: 10.1007/s11356-017-9802-y. Epub 2017 Jul 26.

Application of ultrasound modified corn straw as adsorbent for malachite green removal from synthetic and real effluents.

Author information

1
Chemical Engineering Department, Federal University of Santa Maria-UFSM, 1000 Roraima Avenue, Santa Maria, RS, 97105-900, Brazil.
2
Chemical Engineering Department, Federal University of Santa Maria-UFSM, 1000 Roraima Avenue, Santa Maria, RS, 97105-900, Brazil. guilherme_dotto@yahoo.com.br.

Abstract

This work aimed to study the removal of malachite green dye from wastewaters through adsorption using raw corn straw (RCS) and ultrasound-assisted modified corn straw (MCS). RCS and MCS were prepared and characterized in detail. The characterization indicated that RCS and MCS presented favorable structures for malachite green adsorption and that the ultrasound treatment provided a disorganization of the adsorbent's crystalline regions and also caused the formation of cavities and protuberances. The adsorption study was performed by equilibrium isotherms, kinetic curves, thermodynamic parameters, and application in real effluents composed of dye mixtures and inorganic compounds. The Elovich model was suitable for the adsorption kinetics and the Freundlich model was appropriate to represent the equilibrium. The maximum experimental adsorption capacities were 200 mg g-1 for RCS and 210 mg g-1 for MCS, obtained at 328 K. MCS was more effective than RCS to treat real effluents, attaining around 92% of color removal.

KEYWORDS:

Adsorption; Corn straw adsorbent; Dyes; Ultrasound-assisted treatment

PMID:
28748437
DOI:
10.1007/s11356-017-9802-y
[Indexed for MEDLINE]

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