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Synthesis of magnetite multi‐walled carbon nanotubes composite and its application for removal of basic dyes from aqueous solutions
Author(s) -
Dalali N.,
Habibizadeh M.,
Rostamizadeh K.,
Nakisa S.
Publication year - 2014
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.1784
Subject(s) - adsorption , crystal violet , aqueous solution , sorbent , magnetite , carbon nanotube , composite number , brilliant green , chemical engineering , chemistry , materials science , magnetite nanoparticles , central composite design , magnetic nanoparticles , response surface methodology , nuclear chemistry , nanoparticle , chromatography , nanotechnology , composite material , organic chemistry , metallurgy , medicine , pathology , engineering
ABSTRACT A magnetic composite of multi‐wall carbon nanotubes and magnetite nanoparticles was synthesized, and its applicability to the removal of dye contaminants from aqueous solutions was investigated as adsorbent. Tris(4‐(dimethylamino)phenyl)methylium chloride or crystal violet (also known as gentian violet) was used as a representative of the basic dyes, and an orthogonal array design with four factors—three levels (3 4 ) matrix—was applied to assign the significant factors affecting the dye uptake. The chosen experimental parameters and their ranges were the following: pH, 9–11; adsorbent, 0.002–0.01 g; NaCl concentration, 0–4%; removal time, 1–5 min. L9 orthogonal array for experimental design and the smaller the best criterion based on reduction of residual dye were used to determine the optimum conditions, which were found to be pH = 9, 0.01 g adsorbent, 5 min removal time, and 0% NaCl, respectively. Analysis of variances revealed that the amount of adsorbent affected the adsorption efficiency of crystal violet significantly. The adsorption capacity of sorbent was found to be 38 mg g −1 . The magnetic composite displayed the main advantage of separation convenience compared with the other adsorption techniques. © 2014 Curtin University of Technology and John Wiley & Sons, Ltd.