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Enhanced decolorization of azo dye solution by cadmium sulfide/multi-walled carbon nanotubes/polymer composite in combination with hydrogen peroxide under simulated solar light irradiation
Enhanced decolorization of azo dye solution by cadmium sulfide/multi-walled carbon nanotubes/polymer composite in combination with hydrogen peroxide under simulated solar light irradiation
A Cadmium sulfide/ multi-walled carbon
nanotubes/polymer nanocomposite (CdS/MWCNTs/polymer) was fabricated via a facile
precipitation process by depositing
nanocrystalline CdS on carbon nanotubes/crosslinked chitosan nanocomposite
films and characterized by X-ray diffration (XRD). Under simulated solar light irradiation, a combination of CdS/MWCNTs/polymer and H2O2 (1.0 mM) was found to be highly efficient for photocatalytic decolorization
of a soluble azo dye, methyl orange (MO), even at neutral pH values. 99.9 % of methyl orange solution was successfully decolorized after 90 min
under simulated solar light irradiation with15 mg L-1 of initial MO concentration, 1.0
mM of H2O2 concentration and 0.70 g L-1 of photocatalyst dosage. Experimental results also indicated that the phtocatalytic decolorization of methyl orange solution was strongly influenced by parameters such as
photocatalyst dosage, H2O2 concentration, pH and initial
dye concentration and followed a simplified Langmuir–Hinshelwood (L-H) kinetic model with high R2 values.. The fact that 88.1 % of initial
decolorization was kept after five cycles indicated that the process was
repeatable. As a result, the CdS/MWCNTs/polymer-H2O2 will
potentially provide cheaper and cleaner means for the effective treatment of
dyeing effluents since it increased substantially the efficiency of dye decolorization
and could take full advantage of economical solar light.
