Preparation and Investigation of the Photocatalytic Properties of Periwinkle Shell Ash for Tartrazine Decolourisation

Abstract

The discharge of dye-containing effluents into the aquatic environment represents a source of aesthetic pollution with associated negative effects. Photocatalytic degradation has been identified as a suitable means of treating these effluents. In this study, the potential of a locally sourced material, periwinkle shell ash (PSA), has been explored as an effective photocatalyst for the photocatalytic decolourisation of tartrazine in aqueous solution. The efficiency of the photocatalyst was evaluated by investigating the effects of operational variables such as irradiation time, initial dye concentration and catalyst loading on the extent of decolourisation. The results show that the optimum levels of the variables were 50 minutes, 30 mg/L and 5 g/L for irradiation time, initial dye concentration and catalyst loading respectively. The pseudo first order and the Langmuir-Hinshelwood kinetic models were able to sufficiently describe the kinetics of the process. The diffusion mechanism was described by the intra-particle diffusion model while the adsorption equilibrium was described by the Langmuir isotherm equation. The results obtained indicate that PSA can be used as an effective photocatalyst for the removal of tartrazine from aqueous solution.

Photodegradation, thermodynamic and kinetic study of cationic and anionic dyes from effluents using polyazomethine/ZnO and polyazomethine/TiO2 nanocomposites

“…where K F symbolizes the Freundlich isotherm constant (mg/g), n exemplifies the adsorption intensity, C e signifies the adsorbate equilibrium concentration (mg/L), and q e is the amount of metal adsorbed by the adsorbent at equilibrium b [32][33].…”

Depollution of Synthetic dyes From Waste Water Using Polyazomethine/TiO2 And Polyazomethine/ZnO Nanocomposites Via Photocatalytic Process

“…Chemical oxygen demand (COD), total dissolved solids (TDS), pH inconsistency, and biological reagent degradability are all characteristics of dye wastewater. Human intake of such contaminated water results in wide range of health hazards such as breathing problems, immune suppression, central nervous system disorder, allergic reactions, tissue necrosis and infections in eyes and skin (Al-Kahtani, 2017; Amenaghawon et al, 2014). Hence it is mandatory to remove dyes from wastewater in such a way that both colour and toxicity should get eliminated completely.…”

Decolourization and cod reduction of textile wastewater by ozonation in combination with biological treatment

“…Among these dyes, azo dyes constitute the largest and the most important class of commercial dyes. Azo dyes are widely used in the textile, plastic, leather, and paper industries as additives [3][4][5]. The removal of azo dyes from the aquatic environment is important because many azo dyes are toxic to aquatic organisms [6].…”