Optimization Fro the Photocatalytic Degradation of Methylene Blue Using Sol-gel Derived TiO2 Photocatalyst Supported on Montmorillonite PDF Download
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Author: Nur Azira Iqlima Binti Azmi
Publisher:
ISBN:
Category : Biochemical engineering
Languages : en
Pages : 78
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Book Description
Photocatalytic is a method that can be used to replace conventional wastewater treatment to treat dyes in industry. Photocatalytic degradation of methylene blue (MB) required titanium dioxide (TiO2) photocatalyst under UV radiation. Immobilized TiO2 photocatalyst into support is a solution for easy recovery of photocatalyst after photocatalytic process. Sol-gel method was used to prepare immobilized TiO2 photocatalyst into montmorillonite. The surface morphology of photocatalyst developed has been studied using Scanning Electron Microscope (SEM) where the result indicated that the immobilization was a success. Increasing the amount of montmorillonite used can increase the immbolized amount of TiO2 photocatalyst. The photocatalytic equipment was successfully conducted under UV radiation in a closed box. The photocatalytic degradation was studied by considering three parameters which are photocatalyst loading, initial concentration of MB and pH of solution. Interaction of all three parameters on photocatalytic degradation of methylene was investigated using Design of Expert (DOE) software together with Response Surface Methodology (RSM). The optimum condition found was to be at 40.94 ppm initial concentration of methylene blue with 0.69 g/L photocatalyst loading and pH of 3.13
Author: Nur Azira Iqlima Binti Azmi
Publisher:
ISBN:
Category : Biochemical engineering
Languages : en
Pages : 78
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Book Description
Photocatalytic is a method that can be used to replace conventional wastewater treatment to treat dyes in industry. Photocatalytic degradation of methylene blue (MB) required titanium dioxide (TiO2) photocatalyst under UV radiation. Immobilized TiO2 photocatalyst into support is a solution for easy recovery of photocatalyst after photocatalytic process. Sol-gel method was used to prepare immobilized TiO2 photocatalyst into montmorillonite. The surface morphology of photocatalyst developed has been studied using Scanning Electron Microscope (SEM) where the result indicated that the immobilization was a success. Increasing the amount of montmorillonite used can increase the immbolized amount of TiO2 photocatalyst. The photocatalytic equipment was successfully conducted under UV radiation in a closed box. The photocatalytic degradation was studied by considering three parameters which are photocatalyst loading, initial concentration of MB and pH of solution. Interaction of all three parameters on photocatalytic degradation of methylene was investigated using Design of Expert (DOE) software together with Response Surface Methodology (RSM). The optimum condition found was to be at 40.94 ppm initial concentration of methylene blue with 0.69 g/L photocatalyst loading and pH of 3.13
Author: Muhammed Ahshath A. Jamal Muhammed
Publisher:
ISBN:
Category : Basic Red 46 dye (BR46)
Languages : en
Pages : 64
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Book Description
The present study deals with the investigation of photocatalytic degradation of Basic Red 46 dye (BR46) under ultraviolet ray using TiO2 supported onto montmorillonite as photocatalyst. tiO2 was pepared by sol-gel method and the sol obtained was used for haterocoagulation of na-montmorillonite. The TiO2 photocatalyst was characterized by using Sanning Elelctron Microscopy (SEM). The determination of photocatalytic activity was observed as a function of initial dye concentration, pH of the dye solution and TiO2 photocatalyst dosage. Langmuir -Hinshelwood kinetic model was applied to experimental data and apparent reaction rate contants values were calculated.
Author: Zulfakar Mokhtar
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Burcu Köseoğlu
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Book Description
Pure TiO2 and Fe3+ doped TiO2 photocatalysts were synthesized by changing H2O/Ti ratio, HCl/Ti ratios and calcination temperatures. Photocatalytic activities of the samples were determined for the degradation of methylene blue. The primary objective of this study is to narrow the band gap energies of the photocatalysts by changing preparation procedure and also doping with Fe3+ ions. Pure TiO2 and Fe3+ doped TiO2 photocatalysts were prepared by the sol-gel method, and also the impregnation method was applied for Fe3+ doping. The characterization of the samples was performed by using XRD and DRS techniques. Photocatalytic activities were measured by using UVvis absorbance. This study shows that the heat treatment directly affected the crystallite size.Generally, crystallite size of the samples increased with calcination temperature and the heat treatment between 700 C and 800 C also resulted in crystalline phase transformation from anatase to rutile. TiO2 samples prepared with H2O/Ti ratio of 4 and HCl/Ti ratio of 0.15 calcined at 700 C and H2O/Ti ratio of 4 and HCl/Ti ratio of 0.45 calcined at 800 C had only rutile phase. Band gap energy is one of the important factors affecting the photocatalytic activities. In this thesis study, band gap energies of the TiO2 samples were calculated using DR spectrums together with Kubelka Munk function. The DRS analyses showed that samples with rutile phase had the smallest band gap energies; in fact, the pure TiO2 samples (H2O/Ti ratio of 4 and HCl/Ti ratio of 0.45 calcined at 900 C) had the minimum band gap energy of 3.019 eV and the maximum photocatalytic conversion of 25% in 10 min and 93% conversion was reached in 15 h. In contrast, photocatalytic conversion decreased with doping with Fe3+ with excessive dissolution of iron ions.
Author: Siti Zubaidah Haji Harun
Publisher:
ISBN:
Category : Hazardous wastes
Languages : en
Pages : 68
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Book Description
Author: Pardeep Singh
Publisher: Elsevier
ISBN: 0128185996
Category : Technology & Engineering
Languages : en
Pages : 432
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Book Description
Nano-Materials as Photocatalysts for Degradation of Environmental Pollutants: Challenges and Possibilities contains both practical and theoretical aspects of environmental management using the processes of photodegradation and various heterogeneous catalysts. The book's main focus is on the degradation of harmful pollutants, such as petrochemicals, crude oils, dyes, xenobiotic pharmaceutical waste, endocrine disrupting compounds, and other common pollutants. Chapters incorporate both theoretical and practical aspects. This book is useful for undergraduate or university students, teachers and researchers, especially those working in areas of photocatalysis through heterogeneous catalysts. The primary audience for this book includes Chemical Engineers, Environmental Engineers and scientists, scholars working on the management of hazardous waste, scientists working in fields of materials science, and Civil Engineers working on wastewater treatment. Reviews recent trends in the photodegradation of organic pollutants Offers a bibliometric analysis of photocatalysis for environmental abatement Includes many degradation mechanisms of organic pollutants using various catalysts Includes examples on the degradation of organic pollutants from various sources, e.g., pharmaceuticals, dyes, pesticides, etc. Discusses the effect of nanocatalysts on soil, plants and the ecosystem
Author: Barbara Bonelli
Publisher: MDPI
ISBN: 3039282867
Category : Science
Languages : en
Pages : 98
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Book Description
The quality of water is not only a technological and scientific issue, but a social and economic problem, in both developed and developing countries. Besides local regulations, which differ between regions and need constant upgrades, significant scientific developments are required in both the detection and removal of water contaminants. This Issue focuses on some recent advancements in the photocatalytic removal of organic pollutants, which is one of the aspects of the problem that involves the need of advanced catalysts and implies significant advancements in the field of materials science and chemical engineering.
Author: Juan Manuel Peralta-Hernández
Publisher: Trans Tech Publications Ltd
ISBN: 303641309X
Category : Science
Languages : en
Pages : 521
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Book Description
Aggregated Book
Author: Yige Yan
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
The objective of this work consists in synthesizing TiO2 nanomaterials designed for the degradation of VOCs and for the elimination of bacteria on surface. Firstly, based on a synthesis of a BmimPF6-ionic liquid-derived TiO2 material through a modified sol-gel route, the roles of two constituent elements of BmimPF6 (P and F) have been investigated by replacing BmimPF6 with P- and F- contained additives. Comparing to the reference P25 and additive-free-derived TiO2 materials, P-derived TiO2 showed already well crystallized anatase phase before calcination and a high surface area along with a small mean crystal size even after calcinations. Those properties were similar to that synthesized with the presence of BmimPF6; while F-derived TiO2 crystals showed anisotropic shape during the aging step of the synthesis. Evaluation of the photocatalytic activity of the photocatalysts has been performed then. Compared to additive-free derived TiO2 and the TiO2 P25, P- and F- derived TiO2 materials with low P and F content (“PANaF”) showed higher activity under UVA in terms of gas-phase degradation of a model VOC, Methl Ethyl Ketone (MEK). The same material also showed higher surface anti-bacterial activity under UVA in liquid against several strains of different bacterial species over that of P25. A correlation between the high photocatalytic performances with the material properties for “PANaF” TiO2 materials was finally proposed. The influences of the presence of bulk or surface PO43-, dissolved O2 concentration and surface topology on photocatalytic activity were also discussed. The cheap replacement additives used and the resulted high activity of “PANaF” TiO2 nanomaterials presents interest for industrial elaboration.
Author: Mohamed A. Barakat
Publisher: Springer
ISBN: 3319242717
Category : Science
Languages : en
Pages : 39
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Book Description
In this brief, a comprehensive review of the UV/visible-TiO2 photocatalytic oxidation process is presented with an insight into the mechanisms involved, the role of titanium dioxide as a catalyst, irradiation sources, types of reactors, and a comparison between various modes of TiO2 application. An overview of the development and enhancement of the activity of TiO2 nanoparticles in photocatalysis is presented. The topics covered include a detailed look at the unique properties of the TiO2 nanoparticles and their relationship to photocatalytic properties. The utilization of the TiO2 nanoparticles as photocatalysts, in the non-doped and doped forms is also reviewed. Finally, the use of modified TiO2 nanoparticles has made a significant contribution in providing definitive mechanistic information regarding the visible light photocatalytic processes.
