Effect of inorganic anions on the photocatalytic decolorisation of an azo dye in the aqueous phase by cadmium sulphide/polymer nanocomposite films under visible light irradiation

Abstract

Batch experiments were carried out to study the effects of various inorganic anions on the photocatalytic decolorisation of an azo dye (CI Methyl Orange 13025) in the aqueous phase in the presence of cadmium sulphide ⁄ polymer nanocomposite films under visible light irradiation. When anion concentrations were low (0.001 M), the inhibition effect on the photocatalytic decolorisation of CI Methyl Orange 13025 caused by these anions was ranked as PO 3À 4 >CO 2À 3 >SO 2À 4 >Cl À . The presence of both PO 3À 4 and CO 2À 3 baffled the breakage of the benzene ring in the chemical structure of CI Methyl Orange 13025, while the presence of SO 2À 4 was of benefit to the degradation of the benzene ring. Adsorption experiments indicated that inorganic anions affected the decolorisation of CI Methyl Orange 13025 by competitive adsorption onto the surface of the photocatalyst. The photocatalytic decolorisation of CI Methyl Orange 13025 followed the pseudo-first-order kinetic reaction model well in all experimental cases.

Remarkably enhanced catalytic performance in CoOx/Bi4Ti3O12 heterostructures for methyl orange degradation via piezocatalysis and piezo-photocatalysis

“…Evidently, the introduction of these ions hampers the piezocatalytic degradation of MO ( Fig. S8 b), primarily due to their competitive adsorption with MO on the catalyst surface [57] . Furthermore, these ions can react with the reactive species, thereby diminishing the degradation efficiency of CoO x /BiTO-3.…”

Removal of reactive dyes from wastewater by acrylate polymer beads bearing amino groups: isotherm and kinetic studies

“…Textile wastewater is one of the largest contributors of various pollutants such as dyes, degradable organics, surfactants, heavy metals, etc., and such wastewater has a seriously destructive impact on human health . To prevent dye discharge and contamination, the removal of dyes from aqueous environments by various methods such as advance oxidation , biodegradation , membrane filtration and adsorption has been reported. Many adsorbents have been tested for their potential to lower dye concentrations from aqueous solutions, such as acrylic acid containing crosslinked vinyl benzylchloride beads , carbon, modified clay , chitosan, poly(propylene imine) dendrimer, magnetic nanocomposite hydrogels and others .…”