Solar photocatalysis for treatment of Acid Yellow-17 (AY-17) dye contaminated water using Ag@TiO2 core–shell structured nanoparticles

Abstract

Wastewater released from textile industries causes water pollution, and it needs to be treated before discharge to the environment by cost effective technologies. Solar photocatalysis is a promising technology for the treatment of dye wastewater. The Ag@TiO2 nanoparticles comprising of Ag core and TiO2 shell (Ag@TiO2) have unique photocatalytic property of inhibition of electron-hole recombination and visible light absorption, which makes it a promising photocatalyst for use in solar photocatalysis and with higher photocatalytic rate. Therefore, in the present work, the Ag@TiO2 nanoparticles synthesized by one pot method with postcalcination step has been used for the degradation of Acid Yellow-17 (AY-17) dye under solar light irradiation. The Ag@TiO2 nanoparticles were characterized using thermogravimetric-differential thermal analysis, X-ray diffraction, transmission electron microscopy, selected area electron diffraction, and energy dispersive X-ray analysis. The catalyst has been found to be very effective in solar photocatalysis of AY-17, as compared to other catalysts. The effects of pH, catalyst loading, initial dye concentration, and oxidants on photocatalysis were also studied. The optimized parameters for degradation of AY-17 using Ag@TiO2 were found to be pH 3, dye/catalyst ratio of 1:10 (g/g), and 2 g/L of (NH4)2S2O8 as oxidant. Efficient decolorization and mineralization of AY-17 was achieved. The kinetics of color, total organic carbon, and chemical oxygen demand removal followed the Langmuir-Hinshelwood model. Ag@TiO2 catalyst can be reused thrice without much decline in efficiency. The catalyst exhibited its potential as economic photocatalyst for treatment of dye wastewater.

Photocatalytic Degradation of Azo Dye Reactive Violet 5 on Fe-Doped Titania Catalysts under Visible Light Irradiation

“…This may lead to apparently conflicting results. For example, the highest efficiency for the photocatalytic degradation of azo dye Amido Black 10B was observed at pH 9 [49], while Acid Orange 7 [50] and Acid Yellow 17 [51] showed maximum degradation at pH 3.…”

Decolarization of methylene blue and methyl orange with Ag doped TiO2 under UV-A and UV-Visible conditions: process optimization by response surface method and toxicity evaluation

“…pHpzc values of Ag-TiO2 did not significantly change between 0-1% Ag-TiO2 and they were 6.6, 6.33 and 6.25 in TiO2, 0.5% Ag-TiO2 and 1.0% Ag-TiO2. However, at 2.0% Ag-TiO2 pHpzc values increased to 7.05. pHpzc value is important due to positively surface charged (pH<pHpzc) and negatively surface charged (pH>pHpzc) of the particles (Khanna and Shetty, 2013).…”

Electrochemical detection and photochemical detoxification of hexavalent chromium (Cr(vi)) by Ag doped TiO2nanoparticles

“…[1][2][3] The electrocatalytic and photocatalytic activity of TiO 2 nanoparticles can be enhanced by doping as well as by tailoring their structure, 4,5 size and shape. 7 In the present study, we have successfully used methoxy ethyl methyl imidazolium methane sulfonate (MOE-MIMS) as the reaction medium for the synthesis of Ag doped TiO 2 nanoparticles. 6 For tailoring the structure, size and shape, the ionothermal method is advantageous because the interaction of ILs with nanoparticle precursors involves the nucleation and growth of nanoparticles.…”