Photocatalytic Degradation of Methyl Orange by HKUST-1/TIO2 Thin Film PDF Download
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Author: Nurrul Ilani binti Zawawi
Publisher:
ISBN:
Category : Nanostructured materials
Languages : en
Pages : 58
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Author: Nurrul Ilani binti Zawawi
Publisher:
ISBN:
Category : Nanostructured materials
Languages : en
Pages : 58
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Author: Eugene Leong Eu Yeap
Publisher:
ISBN:
Category : Nanostructured materials
Languages : en
Pages : 66
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Author: Darylng Chuan Yao
Publisher:
ISBN:
Category : Nanostructured materials
Languages : en
Pages : 76
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Author: Rodrigo Teixeira Bento
Publisher:
ISBN:
Category : Technology
Languages : en
Pages :
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The aim of this work was to characterize and evaluate the influence of the thickness on the photocatalytic efficiency of titanium dioxide thin films on the degradation of methyl orange dye under UV light irradiation. The films of 280 and 468 nm thick were deposited on borosilicate substrates at 400°C by the MOCVD technique using titanium isoproxide IV as precursor. XRD analyses showed the formation of anatase-TiO2 phase. Cross-sectional FE-SEM images show that the films presented a dense columnar structure and grown perpendicularly to the substrate surface. The photocatalytic activity of the catalysts was studied using UV-vis spectrophotometry The TiO2 film with 468 nm of thickness presented higher photocatalytic activity exhibiting 69% of dye degradation. The increase of grain size and thickness of the films promoted an improvement of photocatalytic efficiency.
Author: Mehrorang Ghaedi
Publisher: Academic Press
ISBN: 0128188073
Category : Technology & Engineering
Languages : en
Pages : 954
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Photocatalysis: Fundamental Processes and Applications, Volume 32 in the Interface Science and Technology Series, discusses the fundamental aspects of photocatalysis and its process and applications to the decontamination of wastewater, hydrogen production via water splitting, and photo reduction of carbon dioxide to hydrocarbon. The book discusses the fundamental aspects of all applications together with their proper mechanisms, thus providing essential information for deep research in the area of clean environment and green energy production. - Provides background on the fundamental and experimental processes of photocatalysis - Covers photocatalysis and its impact on creating a clean environment and energy sources - Applies photocatalysis to the decontamination of wastewater, hydrogen production via water splitting, and photo reduction of carbon dioxide to hydrocarbon - Edited by a world-leading researcher in interface science
Author: Kae Yang Eng
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
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Author: Abubakar Muhammad
Publisher:
ISBN:
Category :
Languages : en
Pages : 67
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Author: Anahita Motamedisade
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Au nanoclusters (Au NCs) exhibit intriguing size-dependent catalytic, electronic, and optical properties. This thesis uncovers the pivotal role of Au NCs in enhancing the photocatalytic efficiency of titanium dioxide (TiO2) through improved charge separation. -- As the catalytic efficiency of these NCs is closely linked to their size, preventing Au9 NCs' agglomeration becomes essential to enhance catalytic activity, particularly following heat treatment aimed at ligand removal. The study focuses on designing novel systems capable of adsorbing high levels of ultra-small Au9 NCs and preventing their agglomeration during deposition and annealing processes. -- The first approach to achieving this aim involves the preparation of mesoporous TiO2 (MTiO2) with a high density of surface defects, a high specific surface area, and a 3D pore network. These structures provide anchoring sites for the adsorption of Au9 NCs, curbing their mobility and suppressing the tendency to aggregate. Another strategy involves introducing functional groups on the mesoporous TiO2 surface through N or S functionalisation. These chemically modified MTiO2 surfaces can potentially establish a more robust bond between the Au9 NCs and the MTiO2 substrate, preventing agglomeration. -- Comprehensive characterisation techniques, including X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS), Near-edge X-ray absorption fine structure (NEXAFS), Energy-Dispersive X-ray Spectroscopy (EDS), High-Resolution Transmission Electron Microscopy (HRTEM), and Scanning Transmission Electron Microscopy (STEM), provide detailed insights into the properties of the nanocomposites such as the phase type of TiO2, surface morphology and chemistry, and elemental composition, as well as size and dispersity of the Au9 NCs immobilised onto the substrate surface. -- A comprehensive investigation into the relative impacts of surface modification and functionalisation strategies on enhancing the loading of Au9 NCs while mitigating agglomeration is conducted using XPS. Subsequently, the most promising photocatalyst system is identified, and an in-depth analysis of its photocatalytic efficiency in the degradation of methyl orange dye is conducted. Reaction parameters are systematically examined, and their interrelationships are established by applying response surface methodology (RSM). -- In this study, the deposition of Au9 NCs onto S-functionalised mesoporous TiO2 (SMTiO2) is studied to produce efficient photocatalysts. The SMTiO2 substrates prevent the agglomeration of Au9 NCs and enhances the overall loading. Furthermore, nanocomposites of N-functionalised mesoporous TiO2 (NMTiO2) embedded with Au9 NCs are created using a chitosan-assisted soft templating method. The study evaluates the influence of the calcination atmosphere on substrate properties and the adsorption of Au9 NCs. The black NMTiO2 surfaces enhance loading and prevent agglomeration of Au9 NC even after heating, leading to improved photocatalytic effectiveness. -- Transitioning to more sustainable industrial processes is crucial for addressing global challenges. This study focuses on clean drinking water scarcity, specifically addressing hazardous run-offs from chemical industries. Methyl orange (MO) dye, a common environmental pollutant, is chosen as a model compound for studying photocatalytic degradation. The study emphasizes the examination of diverse parameters affecting the degradation of MO dye and study their relationship using Response Surface Methodology (RSM). -- In conclusion, the abstract encapsulates the objectives, methodologies, and key findings of the study, providing a comprehensive overview of the research conducted on Au9 NCs and their role in enhancing the photocatalytic efficiency of TiO2. In this comprehensive journey, our thesis elevates the art of surface modification, where science and creativity come together, opening new possibilities across various materials and systems.
Author: Shu Chin Lee
Publisher:
ISBN:
Category : Photocatalysis
Languages : en
Pages : 57
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Author: Siti Farahiyah Mohd. Rosli
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
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