Removal of malachite green by adsorption and precipitation using aminopropyl functionalized magnesium phyllosilicate

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We report a method for the removal of malachite green (MG) by adsorption and precipitation using nanosized aminopropyl functionalized magnesium phyllosilicate (AMP) clay. MG, which is used in aquaculture and fisheries, is a carcinogenic and mutagenic compound. In response to these health risks, many efforts have been focused on adsorption of MG onto various adsorbents, which is a versatile and widely used technique for removing MG from water. Herein, we describe the adsorption and precipitation of MG using AMP clay, as well as the alkaline fading phenomenon of MG. In this study, prepared AMP clay and the precipitate product after the reaction of MG-AMP clay mixture were characterized. In addition, adsorption isotherms and kinetics, as well as thermodynamic studies are presented. Based on the results, we suggest a macro- and microscopic removal mechanism for the adsorption and precipitation of MG using AMP clay. An AMP clay dosage of 0.1 mg mL(-1) exhibited a maximum removal capacity of 334.80 mg g(-1) and 81.72% MG removal efficiency. With further increases of the AMP clay dosage, removal capacity by AMP clay gradually decreased; at dosage above 0.2 mg mL(-1) of AMP clay, the removal efficiency reached 100%. (C) 2011 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2011-08
Language
English
Article Type
Article
Keywords

WASTE-WATER; AQUEOUS-SOLUTION; MESOLAMELLAR NANOCOMPOSITES; COLUMN OPERATIONS; EQUILIBRIUM; DYE; KINETICS; RECOVERY; SORPTION; ORGANOCLAY

Citation

JOURNAL OF HAZARDOUS MATERIALS, v.192, no.1, pp.62 - 70

ISSN
0304-3894
URI
http://hdl.handle.net/10203/96258
Appears in Collection
CBE-Journal Papers(저널논문)
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