Photocatalytic Degradation of Reactive Dyes Using Flyash Supported Ag‐TiO₂ Photocatalysts

Abstract

In the present study, photocatalytic degradation of five different reactive dyes has been carried out using Ag doped TiO 2 supported on coal fly ash (CFA) as a photo catalyst system (Ag-TiO 2 /CFA). The photocatalysts were synthesized with varying the percentage of Ag and characterized by XRD, SEM and UVvisible spectrophotometry. The photocatalytic activity of Ag-TiO 2 /CFA photocatalysts was studied for the degradation of reactive dyes in presence of both UV and visible light sources. The degradation was monitored by absorbance measurements. It was found that 3 wt % of Ag doping could bring about maximum degradation (85-95 %) at 3-4 h in presence of visible light. The effect of various parameters such as initial concentration of dye, catalyst amount and pH of solution towards the degradation were studied and it was observed that in acidic conditions the degradation was maximum (pH = 3.0) for all the dyes studied. Ability to degrade an industrial waste, use of CFA, a thermal power plant waste as support, small quantities of silver required and degradation under visible light are the environmental as well as economic advantages of this developed catalytic system.

Photocatalytic Degradation Properties of Nano‐lignocellulose⋅NiNiO/GR‐TiO2 Hollow Rod Composite for Methylene Blue

“…The peaks of the anatase TiO 2 of catalytic materials appear at 2θ values of 25.3° (101), 37.8° (004), 48.1° (200), 53.8° (105), 55.2° (211) and 63.0° (204). TiO 2 supported on cellulose metallized showed anatase form indicating it has not changed its crystal structure [38,39] . The XRD pattern of the total composite showed the same diffraction peaks of both Ni and anatase TiO 2 , which indicated that the composite was successfully formed.…”

“…TiO 2 supported on cellulose metallized showed anatase form indicating it has not changed its crystal structure. [38,39] The XRD pattern of the total composite showed the same diffraction peaks of both Ni and anatase TiO 2 , which indicated that the composite was successfully formed.…”

Advancement in Sustainable Wastewater Treatment: A Multifaceted Approach to Textile Dye Removal through Physical, Biological and Chemical Techniques

“…Titanium dioxide (TiO 2 ) is a semiconductor substance that is frequently used in photocatalytic applications. [200][201][202] As a result, it is the catalyst of choice for degrading dyes into mineralization compounds due to its widespread availability, chemical stability, good optical transparency, high refractive index, and ecologically acceptable nature. [203] Nanocatalysts, unlike catalysts, have a higher surface area, which allows for better surface-volume interaction and, as a result, better adsorption properties.…”

“…reported the photodegradation of malachite green with the help of fabricated lanthanum‐ferrite (LaFeO 3 ) perovskite oxide (PO) obtained from the Terminalia arjuna leaf. Titanium dioxide (TiO 2 ) is a semiconductor substance that is frequently used in photocatalytic applications [200–202] . As a result, it is the catalyst of choice for degrading dyes into mineralization compounds due to its widespread availability, chemical stability, good optical transparency, high refractive index, and ecologically acceptable nature [203] …”

Facilely Synthesized Cobalt Doped TiO2 Graphene Oxide Nanocomposite as an Advanced Photocatalyst Material for Degradation of Methylene Blue

“…[9,10] Heterojunctions between metals and TiO 2 photocatalysts can enhance the interfacial charge-transfer performance and thereby its absorption edge can be extended to the visible light region. [11,12] Among metal ions, Co 2 + is one of the most efficient dopants due to its optically active nature; doping Co 2 + could improve the light response and help to boost the performance of TiO 2 . [13,14] Recently, studies on cobalt-doped TiO 2 photocatalysts have indicated significant performance in the degradation of a wide variety of organic pollutants.…”