Adsorption and Photocatalytic Performance of Ternary TiO2/ZnS/GO Composite for the Removal of Dyes

The escalating environmental concerns associated with the widespread use of synthetic dyes in industrial processes necessitate innovative and efficient approaches for their removal from aqueous environments. Ternary composites, with titanium dioxide (TiO₂) as a key component, are recognized for exce...

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Main Author:	Allysha Riziana, Reduan
Format:	Thesis
Language:	English English English
Published:	2024
Subjects:	Q Science (General) QD Chemistry
Online Access:	http://ir.unimas.my/id/eprint/45486/3/DOW_Allysha%20Riziana.pdf http://ir.unimas.my/id/eprint/45486/4/Thesis%20MSc_Allysha%20Riziana.ftext.pdf http://ir.unimas.my/id/eprint/45486/5/Thesis%20MSc_Allysha%20Riziana%20-%2024%20pages.pdf
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spelling	my-unimas-ir.454862024-08-08T05:18:34Z Adsorption and Photocatalytic Performance of Ternary TiO2/ZnS/GO Composite for the Removal of Dyes 2024 Allysha Riziana, Reduan Q Science (General) QD Chemistry The escalating environmental concerns associated with the widespread use of synthetic dyes in industrial processes necessitate innovative and efficient approaches for their removal from aqueous environments. Ternary composites, with titanium dioxide (TiO₂) as a key component, are recognized for exceptional photocatalytic performance in water treatment. Zinc sulphide (ZnS) and graphene oxide (GO) were added to TiO₂ to enhance its photocatalytic and adsorption properties by promoting charge carrier separation that increases the likelihood of electron transfer reactions, thereby boosting its efficiency in degrading pollutants. This study aimed to assess the efficacy of TiO₂/ZnS/GO composites (1:1:1, 1:2:1, and 2:1:1) in removing single and mixed dye pollutants, including Methylene blue (MB), Methyl orange (MO), and Rhodamine B (Rho B). Various spectroscopic and microscopic techniques comprehensively confirmed the successful creation of TiO₂/ZnS/GO composites. Due to its superior performance, 1.0 g of the TiO₂/ZnS/GO (1:1:1) achieved the highest MB removal rate (98.4%) at an initial concentration of 20 ppm over 150 minutes under UVA irradiation, surpassing other composites. In mixed dyes, the TiO₂/ZnS/GO composite removed 99.1%, 44.3%, and 62.1% of MB, MO, and Rho B, respectively. The presence of different radical scavengers in MB removal showed that the active species in the photocatalytic degradation were •OH and •O2− radicals. TiO₂/ZnS/GO-CaAlg beads achieved 64.2% for MB and 12.2% for Rho B, while MO showed no removal in mixed medium. The recyclability study revealed superior stability of TiO₂/ZnS/GO-CaAlg beads compared to the TiO₂/ZnS/GO powder. These findings provide valuable insights into its efficiency in addressing multiple pollutants. UNIMAS 2024 Thesis http://ir.unimas.my/id/eprint/45486/ http://ir.unimas.my/id/eprint/45486/3/DOW_Allysha%20Riziana.pdf text en staffonly http://ir.unimas.my/id/eprint/45486/4/Thesis%20MSc_Allysha%20Riziana.ftext.pdf text en validuser http://ir.unimas.my/id/eprint/45486/5/Thesis%20MSc_Allysha%20Riziana%20-%2024%20pages.pdf text en public masters Faculty of Resource Science and Technology Chemistry Department
institution	Universiti Malaysia Sarawak
collection	UNIMAS Institutional Repository
language	English English English
topic	Q Science (General) QD Chemistry
spellingShingle	Q Science (General) QD Chemistry Allysha Riziana, Reduan Adsorption and Photocatalytic Performance of Ternary TiO2/ZnS/GO Composite for the Removal of Dyes
description	The escalating environmental concerns associated with the widespread use of synthetic dyes in industrial processes necessitate innovative and efficient approaches for their removal from aqueous environments. Ternary composites, with titanium dioxide (TiO₂) as a key component, are recognized for exceptional photocatalytic performance in water treatment. Zinc sulphide (ZnS) and graphene oxide (GO) were added to TiO₂ to enhance its photocatalytic and adsorption properties by promoting charge carrier separation that increases the likelihood of electron transfer reactions, thereby boosting its efficiency in degrading pollutants. This study aimed to assess the efficacy of TiO₂/ZnS/GO composites (1:1:1, 1:2:1, and 2:1:1) in removing single and mixed dye pollutants, including Methylene blue (MB), Methyl orange (MO), and Rhodamine B (Rho B). Various spectroscopic and microscopic techniques comprehensively confirmed the successful creation of TiO₂/ZnS/GO composites. Due to its superior performance, 1.0 g of the TiO₂/ZnS/GO (1:1:1) achieved the highest MB removal rate (98.4%) at an initial concentration of 20 ppm over 150 minutes under UVA irradiation, surpassing other composites. In mixed dyes, the TiO₂/ZnS/GO composite removed 99.1%, 44.3%, and 62.1% of MB, MO, and Rho B, respectively. The presence of different radical scavengers in MB removal showed that the active species in the photocatalytic degradation were •OH and •O2− radicals. TiO₂/ZnS/GO-CaAlg beads achieved 64.2% for MB and 12.2% for Rho B, while MO showed no removal in mixed medium. The recyclability study revealed superior stability of TiO₂/ZnS/GO-CaAlg beads compared to the TiO₂/ZnS/GO powder. These findings provide valuable insights into its efficiency in addressing multiple pollutants.
format	Thesis
qualification_level	Master's degree
author	Allysha Riziana, Reduan
author_facet	Allysha Riziana, Reduan
author_sort	Allysha Riziana, Reduan
title	Adsorption and Photocatalytic Performance of Ternary TiO2/ZnS/GO Composite for the Removal of Dyes
title_short	Adsorption and Photocatalytic Performance of Ternary TiO2/ZnS/GO Composite for the Removal of Dyes
title_full	Adsorption and Photocatalytic Performance of Ternary TiO2/ZnS/GO Composite for the Removal of Dyes
title_fullStr	Adsorption and Photocatalytic Performance of Ternary TiO2/ZnS/GO Composite for the Removal of Dyes
title_full_unstemmed	Adsorption and Photocatalytic Performance of Ternary TiO2/ZnS/GO Composite for the Removal of Dyes
title_sort	adsorption and photocatalytic performance of ternary tio2/zns/go composite for the removal of dyes
granting_institution	Faculty of Resource Science and Technology
granting_department	Chemistry Department
publishDate	2024
url	http://ir.unimas.my/id/eprint/45486/3/DOW_Allysha%20Riziana.pdf http://ir.unimas.my/id/eprint/45486/4/Thesis%20MSc_Allysha%20Riziana.ftext.pdf http://ir.unimas.my/id/eprint/45486/5/Thesis%20MSc_Allysha%20Riziana%20-%2024%20pages.pdf
_version_	1811771579381579776

Adsorption and Photocatalytic Performance of Ternary TiO2/ZnS/GO Composite for the Removal of Dyes

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