An overview of azo dyes and an investigation ...

An overview of azo dyes and an investigation study on photocatalytic degradation of Calmagite dye using Bi2MoZnO7nanocomposite

Author Name : Garima Nagraj, Brijesh Pare, Poonam Geed

ABSTRACT

Increasing population and industrialization in different fields, viz., textile, paper, printing, plastics, leather, cosmetics and food processing industries essentially requires the advancement in the synthesis of new and eco-friendly dyes. Innumerable dyes are used in various industries, among them azo dyes are broadly used in textile industries. Azo dyes are carcinogenic as well as mutagenic for human beings and also cause hazardous effects on aquatic life. Textile effluents contain large quantities of azo dyes that are major contributors to environmental pollution. The environmentalists are aware of the necessity of the environmental and ecological sustainability of the natural water resources. At present, several industries are trying to identify cleaner production practices to decrease water usage and also limit the amount of dyes used to color fabrics in order to limit the disposal of toxic wastewater and prevent the contamination of natural water resources. Textile industries working on the model of cleaner production practices are also focussing on water reuse and the minimization of all the chemicals and materials used in the dyeing and finishing process. This study highlights the history of dyes, a brief detail about the azo dyes and their versatility in various fields. The objective of this research is to fetch information regarding azo dyes and their future demands. Herein, the investigation was performed on the photocatalytic degradation of Calmagite dye using Bi₂MoZnO₇ (BMZ) nanocomposite under visible light irradiation. Calmagite dye belongs to the azo class of dyes. The experiments were conducted to study the most essential parameters affecting the degradation process. Effect of pH, catalyst loading, dye concentration and pure N₂ and O₂ purging into the dye suspension.Azo dye Calmagite was selected as the model contaminant, as it is cost-effective, easily available and in the future novel azo dyes could be synthesized using advanced routes with diverse properties and applications.

Keywords: Azo dyeCalmagite, photocatalytic degradation, Bi₂MoZnO₇nanocomposite, environmental relevance