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Concepts of Semiconductor Photocatalysis最新文献

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Effect of Annealing on Metal-Oxide Nanocluster 退火对金属氧化物纳米团簇的影响
Concepts of Semiconductor Photocatalysis Pub Date : 2019-12-18 DOI: 10.5772/intechopen.82267
N. K. Singh, Rajshree Rajkumari
{"title":"Effect of Annealing on Metal-Oxide Nanocluster","authors":"N. K. Singh, Rajshree Rajkumari","doi":"10.5772/intechopen.82267","DOIUrl":"https://doi.org/10.5772/intechopen.82267","url":null,"abstract":"Recently, the development of optoelectronic devices based on metal-oxide nanocluster has attracted intensive research interest. Nanoclusters are suitable for these because of their large surface-to-volume ratio and the presence of abundant oxygen vacancies or trap states. Metal–oxides such as ZnO, In 2 O 3 , and TiO 2 synthesized using different technique produces high surface area films consisting of clusters and provides complete control over the film morphology. In this chapter, some of the metal oxides nanocluster film has investigated, and the effect of annealing on the structural, optical and electrical properties of the grown films when subjected to different annealing temperatures will be studied. Theoretically, these properties are presumed to improve after the heat treatment as the crystallinity, and the grain size of the film has increased due to the diminishing of oxygen vacancies. Thus, the greater surface-to-volume ratio, the better stoichiometry and higher level of crystallinity compared to bulk materials make nanocluster-based devices very promising for the mentioned application.","PeriodicalId":211086,"journal":{"name":"Concepts of Semiconductor Photocatalysis","volume":"235 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114695580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Introductory Chapter: Fundamentals of Semiconductor Photocatalysis 导论章:半导体光催化的基本原理
Concepts of Semiconductor Photocatalysis Pub Date : 2019-12-18 DOI: 10.5772/intechopen.89586
M. Rahman
{"title":"Introductory Chapter: Fundamentals of Semiconductor Photocatalysis","authors":"M. Rahman","doi":"10.5772/intechopen.89586","DOIUrl":"https://doi.org/10.5772/intechopen.89586","url":null,"abstract":"In semiconductor photo-catalysis, generally it is used to design, characterize, and potential photocatalytical applications with doped or undoped nanostructural materials especially considering their particle sizes as well as shapes. Nanostructured materials, for example, porous metal oxides, metal nanoparticles, porous carbons, and their composites are widely studied for their potential applications in energy conversion/storage devices, gas storage, photocatalysis as well as in electrocatalysis. Photocatalysis is the phenomena, which occurs in catalysis by influence of photons. An efficient photocatalyst is a conductive nanomaterial, which directly absorbs incident light to bring up to higher energy states, which provides such energy to a reacting substance to make a chemical reaction occur. The mechanism of photocatalytic water splitting over semiconductor photocatalysts is also discussed in this chapter. Thermodynamically, the reaction of complete water splitting under normal conditions is a highly endothermic process because the change in the standard Gibbs energy is very large.","PeriodicalId":211086,"journal":{"name":"Concepts of Semiconductor Photocatalysis","volume":"81 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134011272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Radiative Transference Equation Algorithm as an ANSYS® User-Defined Function for Solar Technology Applications 辐射传递方程算法作为ANSYS®用户自定义函数用于太阳能技术应用
Concepts of Semiconductor Photocatalysis Pub Date : 2019-08-27 DOI: 10.5772/INTECHOPEN.88767
D. Barraza-Jiménez, Adolfo Ruiz-Soto, S. Torres-Herrera, Elva Marcela Coria-Quiñones, Raúl Armando Olvera-Corral, David José Romero-Soto, M. A. Flores-Hidalgo
{"title":"Radiative Transference Equation Algorithm as an ANSYS® User-Defined Function for Solar Technology Applications","authors":"D. Barraza-Jiménez, Adolfo Ruiz-Soto, S. Torres-Herrera, Elva Marcela Coria-Quiñones, Raúl Armando Olvera-Corral, David José Romero-Soto, M. A. Flores-Hidalgo","doi":"10.5772/INTECHOPEN.88767","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.88767","url":null,"abstract":"Heat effects in photocatalytic reactor applications are discussed and a case study is analyzed where sunlight is used to activate a chemical reaction to degrade water pollutants. Heat is produced in the light-capturing process, and heat effects need to be better understood during the device design process. Radiative transfer equation (RTE) is the guiding equation used to calculate radiation proliferation in participating media, and it is used to describe the balance of radiative energy transport in the participating media including the interactions caused by different processes such as absorption, scattering, and emission, which also are subject to additional phenomena like weakening and magnification. This equation plays an important role in the design process since it may be included in the simulation process to represent the sunlight heat effects in the different photocatalytic reactor components. In this chapter, it is explained how to build a simplified algorithm to incorporate the RTE in a numerical calculation during the design of a photocatalytic reactor using the commercial software ANSYS®. In addition, simplifications are explained that enable the program to coordinate some coefficients such as absorption and dispersion so their effects are included within the numerical calculation. A user-defined function is presented in the end of the chapter as a usable algorithm in ANSYS® program with acceptable results for photocatalytic reactors.","PeriodicalId":211086,"journal":{"name":"Concepts of Semiconductor Photocatalysis","volume":"6 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130013393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants 可见光光催化水污染物的半导体纳米复合材料
Concepts of Semiconductor Photocatalysis Pub Date : 2019-08-06 DOI: 10.5772/INTECHOPEN.86542
F. Imtiaz, J. Rashid, Ming Xu
{"title":"Semiconductor Nanocomposites for Visible Light Photocatalysis of Water Pollutants","authors":"F. Imtiaz, J. Rashid, Ming Xu","doi":"10.5772/INTECHOPEN.86542","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.86542","url":null,"abstract":"Semiconductor photocatalysis gained reputation in the early 1970s when Fujishima and Honda revealed the potential of TiO2 to split water in to hydrogen and oxygen in a photoelectrochemical cell. Their work provided the base for the development of semiconductor photocatalysis for the environmental remediation and energy applications. Photoactivity of some semiconductors was found to be low due to larger band gap energy and higher electron-hole pair recombination rate. To avoid these problems, the development of visible light responsive photocatalytic materials by different approaches, such as metal and/or non-metal doping, codoping, coupling of semiconductors, composites and heterojunctions materials synthesis has been widely investigated and explored in systematic manner. This chapter emphasizes on the different type of tailored photocatalyst materials having the enhanced visible light absorption properties, lower band gap energy and recombination rate of electron-hole pairs and production of reactive radical species. Visible light active semiconductors for the environmental remediation purposes, particularly for water treatment and disinfection are also discussed in detail. Studies on the photocatalytic degradation of emerging organic compounds like cyanotoxins, VOCs, phenols, pharmaceuticals, etc., by employing variety of modified semiconductors, are summarized, and a mechanistic aspects of the photocatalysis has been discussed.","PeriodicalId":211086,"journal":{"name":"Concepts of Semiconductor Photocatalysis","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127230504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
TiO2 Nanoparticles Supported on Hierarchical Meso/Macroporous SiO2 Spheres for Photocatalytic Applications 介孔/大孔SiO2微球负载TiO2纳米颗粒在光催化中的应用
Concepts of Semiconductor Photocatalysis Pub Date : 2019-06-17 DOI: 10.5772/INTECHOPEN.86153
K. Fuentes, M. Sánchez-Domínguez, S. A. Bilmes
{"title":"TiO2 Nanoparticles Supported on Hierarchical Meso/Macroporous SiO2 Spheres for Photocatalytic Applications","authors":"K. Fuentes, M. Sánchez-Domínguez, S. A. Bilmes","doi":"10.5772/INTECHOPEN.86153","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.86153","url":null,"abstract":"Supporting a photocatalyst, such as titania nanoparticles (TiO 2 NPs), is a good strategy to improve its performance since it can facilitate the photocatalyst recovery from the aqueous media and provides a high surface area for pollutant adsorption. Among the several advanced functional materials used as TiO 2 NP support, the hierarchical meso/macroporous SiO 2 spheres not only show the advantages associated to its chemical nature but also the dendritic fibrous structure provides a porous network that offers many benefits to be exploited in optical and catalytic devices. In this chapter, different synthetic approaches to design hierarchical meso/macro-porous silica and the strategies to support TiO 2 NPs regarding the photocatalytic performance of these materials are shown.","PeriodicalId":211086,"journal":{"name":"Concepts of Semiconductor Photocatalysis","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114554272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Rare-Earth-Based Materials for Heterogeneous Photocatalysis 稀土基非均相光催化材料
Concepts of Semiconductor Photocatalysis Pub Date : 2019-06-04 DOI: 10.5772/INTECHOPEN.85525
S. Zinatloo-Ajabshir, Zahra Sayyar
{"title":"Rare-Earth-Based Materials for Heterogeneous Photocatalysis","authors":"S. Zinatloo-Ajabshir, Zahra Sayyar","doi":"10.5772/INTECHOPEN.85525","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.85525","url":null,"abstract":"Recently, the synthesis of rare-earth-based nanostructures as a significant class of materials with photocatalysis activity has attracted the attention of researchers. Many studies have shown their applications in various fields, specifically in photocatalysis. There are different methods to synthesis of rare-earth nanostructures. In this study, we discuss about modification of rare-earth-based materials. Also production methods and their advantages and disadvantages have been presented, briefly. Finally, photocatalytic applications of rare-earth nanostructures are highlighted.","PeriodicalId":211086,"journal":{"name":"Concepts of Semiconductor Photocatalysis","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131601697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Toward the Creation of Highly Active Photocatalysts That Convert Methane into Methanol 制备甲烷转化为甲醇的高活性光催化剂的研究
Concepts of Semiconductor Photocatalysis Pub Date : 2019-03-21 DOI: 10.5772/INTECHOPEN.85335
Y. Negishi, Seiichiro Watanabe, M. Aoki, Sakiat Hossain, Wataru Kurashige
{"title":"Toward the Creation of Highly Active Photocatalysts That Convert Methane into Methanol","authors":"Y. Negishi, Seiichiro Watanabe, M. Aoki, Sakiat Hossain, Wataru Kurashige","doi":"10.5772/INTECHOPEN.85335","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.85335","url":null,"abstract":"Methane exists abundantly around Japan as methane hydrate. As the effective use of such methane, the conversion of methane into methanol has recently attracted much attention. Photocatalytic reaction is one of the methods which convert methane into methanol without using much energy. However, it is indispensable to improve the photocatalytic activity for their practical use. Our group has attempted to improve the activity of mesoporous tungsten trioxide and titanium dioxide (m-WO 3 and m-TiO 2 ) photocatalysts, which convert methane into methanol, by loading the ultrafine metal clusters as cocatalyst on the photocatalysts. As a result, we have succeeded in loading ultrafine metal-cluster cocatalysts onto m-WO 3 and m-TiO 2 and thereby improving their photocatalytic activity. Our study also demonstrated that the kind of metal element suitable for each photocatalyst depends on the kind of the photocatalysts, and thereby it is important to select the metal clusters suitable for each photocatalyst for improving its photocatalytic activity.","PeriodicalId":211086,"journal":{"name":"Concepts of Semiconductor Photocatalysis","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129272090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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