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Synthesis of Mesoporous TiO2/Boron-Doped Diamond Photocatalyst and Its Photocatalytic Activity under Deep UV Light (λ = 222 nm) Irradiation
摘要： There is a need for highly efficient photocatalysts, particularly for water purification. In this study, we fabricated a mesoporous TiO2 thin film on a boron-doped diamond (BDD) layer by a surfactant-assisted sol-gel method, in which self-assembled amphiphilic surfactant micelles were used as an organic template. Scanning electron microscopy revealed uniform mesopores, approximately 20 nm in diameter, that were hexagonally packed in the TiO2 thin film. Wide-angle X-ray diffraction and Raman spectroscopy clarified that the framework crystallized in the anatase phase. Current–voltage (I–V) measurements showed rectification features at the TiO2/BDD heterojunction, confirming that a p–n hetero-interface formed. The as-synthesized mesoporous TiO2/BDD worked well as a photocatalyst, even with a small volume of TiO2 (15 mm × 15 mm × c.a. 1.5 μm in thickness). The use of deep UV light (λ = 222 nm) as a light source was necessary to enhance photocatalytic activity, due to photo-excitation occurring in both BDD and TiO2.
关键词： photocatalyst,water purification,thin film,surfactant-assisted sol-gel method,p-n heterojunction,deep UV light,mesoporous metal oxide
更新于2025-09-10 09:29:36
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Nanoscale Materials in Water Purification || Recent Progress in TiO2- and ZnO-Based Nanostructured Hybrid Photocatalysts for Water Purification and Hydrogen Generation
摘要： Energy and clean environmental conditions are the two basic requirements for the survival and progress of human civilization. The Industrial Revolution was a prime factor in the rapid development of human society. However, the industrial malpractices of waste disposal and extensive use of fossil fuels have led human society to face a number of challenges such as global warming, and water and air pollution. Also, the extensive use of pesticides in agriculture has led to high toxicity in soil and ground water, which can pose a big threat to human and wildlife [1]. A recent WHO report shows that about 3.7 million people globally die each year in the 21st century from the hazards of water and air pollution, and 92% of the world’s population still does not have access to pure water [2]. The fossil fuel resources are limited in their ability to cater to the energy demands of the growing world’s population and are on the verge of exhaustion in the near future. This has led to the fear of energy crises, which can prove fatal for human society. Hence, the search for an ultimate and clean energy source, as well as the development of technologies for the remediation of hazardous materials from the environment have become topics of high international concern. There have been several attempts to harness alternative energy sources such as wind, water tides, biomass and solar energy, etc., as well as to design methods for the remediation of environmental pollutants. Hence, the development of cleaner, low carbon, and sustainable technologies is a bigger challenge for scientists and engineers worldwide [3]. Some technologies have been developed to harness alternative energy sources, but these have proven either inefficient or too expensive. Also, efforts toward the removal of harmful environmental pollutants are either inefficient or have their own side effects [4]. Among renewable energy sources, solar energy is available in abundance and has the potential for overcoming current environmental impacts. However, its unavailability at night, and during rainy and foggy seasons make it difficult to properly harness. Hence, transforming energy from sunlight to the chemical energy of hydrogen through photocatalytic water splitting could be a more promising approach [5]. Solar energy is also gaining attention for water treatment. There have been a number of metal oxide-based photocatalysts prepared for degrading organic pollutants such as dyes and pesticides. This chapter stresses H2 generation through photocatalytic and photoelectrochemical water splitting and photocatalytic water treatment using two well-known photocatalysts, ZnO and TiO2.
关键词： ZnO,water purification,nanostructured hybrid photocatalysts,hydrogen generation,TiO2
更新于2025-09-09 09:28:46
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Comprehensive Membrane Science and Engineering || 3.5 Photocatalytic Processes in Membrane Reactors
摘要： Photocatalytic membrane reactors (PMRs) represent an interesting alternative technology useful both in the field of water and air purification and in organic syntheses. The necessity to develop chemical products and industrial processes that reduce or eliminate the use and the generation of toxic substances along with the risk for human health and for environment constitutes the aim of the research efforts based on the principles of green chemistry.
关键词： air purification,green chemistry,Photocatalytic membrane reactors,water purification,organic syntheses
更新于2025-09-04 15:30:14