共查询到19条相似文献,搜索用时 93 毫秒
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光催化降解水中有机污染物研究现状与展望 总被引:32,自引:3,他引:32
光催化技术是一种新兴、高效、节能、现代污水处理技术。从半导体光催化技术研究现状、反应机理、常见有机污染物光催化降解的现状、提高半导体光催化剂活性的途径、光催化技术发展中存在问题等方面对半导体光催化技术加以综述和讨论。目前不论从光催化技术、光催化的基础研究以及光催化应用研究方面都需进行大量的、深入研究工作。 相似文献
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综述了银基微纳米半导体光催化应用研究进展.指出银基微纳米半导体在可见光辐照下表现出良好的光催化性能(光催化降解有机物或光解水制氢制氧),目前的研究主要集中在简单的含银化合物、含银的异质结构、含银的多金属氧化物和含银的固溶体这几类;并从光催化原理和能隙调节手段入手阐述了决定其光催化性能的因素. 相似文献
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崔玉民 《影像科学与光化学》2004,22(6):434-443
光催化技术是一种新兴的高效节能现代污水处理技术,本文从半导体光催化技术研究现状、反应机理、反应动力学、光催化技术发展及其存在的问题等方面对半导体光催化技术在降解常见有机染料方面的应用加以综述. 相似文献
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掺杂对PbTiO3光催化活性的影响 总被引:9,自引:1,他引:9
掺杂对PbTiO_3光催化活性的影响傅希贤,单志兴,肖坤林,曾淑兰(天津大学化学系天津300072)关键词PbTiO_3,掺杂,光催化活性,光降解利用半导体材料光催化降解水中污染物是近年发展起来的重要课题之一[1],一般多采用半导体氧化物为光催化剂,文... 相似文献
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Dr. Xiaohui Zhang Neng Qin Dr. Hongbo Cui Prof. Guijian Guan Prof. Ming-Yong Han 《化学:亚洲杂志》2021,16(20):3038-3054
As a promising technique to potentially address the energy crisis and environmental issues, photocatalysis has been reported widely to exhibit various outstanding behaviors in production of new fuels/chemicals and treatment of contaminants. The photocatalytic performance is extremely dependent on the used photocatalysts, so that the design and preparation of efficient photocatalysts are critically important for significantly improving the photocatalytic activity. Among various strategies, the hybridization of metal with semiconductors has recently been attracting more and more research interest owing to their expended spectral absorption, promoted transferring rate of charge carriers and Plasmon-enhanced effect. In this minireview, the metal-facilitated hybrid photocatalysts are overviewed comprehensively to first reveal unique functions of metals in improvement of photoactivity and summarize the emerging metal-involved hybrid systems. Subsequently, the synthetic methods towards hybrid photocatalysts are introduced and their practical applications are emphasized in environmental remediation including degradation of organic pollutants, conversion of harmful gases, treatment of heavy metal ions and sterilization of bacteria. At the end, the challenges for industrializing these hybrid photocatalysts are discussed carefully and future development is suggested rationally. 相似文献
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TiO2 has received tremendous attention owing to its potential applications in the field of photocatalysis for solar fuel production and environmental remediation. This review mainly describes various modification strategies and potential applications of TiO2 in efficient photocatalysis. In past few years, various strategies have been developed to improve the photocatalytic performance of TiO2, including noble metal deposition, elemental doping, inorganic acids modification, heterojunctions with other semiconductors, dye sensitization and metal ion implantation. The enhanced photocatalytic activities of TiO2-based material for CO2 conversion, water splitting and pollutants degradation are highlighted in this review. 相似文献
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共价有机框架(COFs)材料是有机构筑基元通过共价键连接而形成的晶态有机多孔材料. COFs具有孔道结构规整、 及比表面积高等特点, 被广泛地应用于气体储存与分离、 催化、 传感、 储能及光电转化等领域. 将具有可调吸光能力的有机构筑基元引入到COFs中, 可使其展现出强大的光催化潜力. 近年来, COFs在光催化领域中发展迅猛. 本文总结了COFs在光催化产氢、 光催化二氧化碳还原、 光催化有机反应以及光催化污染物降解等方面的研究进展, 并展望了其在光催化领域的应用前景. 相似文献
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Highly Efficient Photocatalysts and Continuous‐Flow Photocatalytic Reactors for Degradation of Organic Pollutants in Wastewater 下载免费PDF全文
Dr. Sujie Chang Prof. Xiaoqiu Yang Dr. Yuanhua Sang Prof. Dr. Hong Liu 《化学:亚洲杂志》2016,11(17):2352-2371
One of the most important applications for photocatalysis is engineered water treatment that photodegrades organic pollutants in wastewater at low cost. To overcome the low efficiency of batch degradation methods, continuous‐flow photocatalytic reactors have been proposed and have become the most promising method for mass water treatment. However, most commercial semiconductor photocatalysts are granular nanoparticles with low activity and a narrow active light wavelength band; this creates difficulties for direct use in continuous‐flow photocatalytic reactors. Therefore, a high‐performance photodegradation photocatalyst with proper morphology or structure is key for continuous photocatalytic degradation. Moreover, a well‐designed photocatalytic device is another important component for continuous‐flow photocatalysis and determines the efficiency of photocatalysis in practical water treatment. This review describes the basic design principles and synthesis of photocatalysts with excellent performance and special morphologies suitable for a filtering photocatalysis process. Certain promising continuous photodegradation reactors are also categorized and summarized. Additionally, selected scientific and technical problems that must be urgently solved are suggested. 相似文献
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Pinghua Chen Huitao Zheng Hualin Jiang Jun Liu Xinman Tu Weibo Zhang Bailey Phillips Lei Fang Jian-Ping Zou 《中国化学快报》2022,33(2):907-911
To address the challenge of treating complex pollutants containing heavy metals and organic compounds,a phenanthroline/TiO2 nanocomposite with rich oxygen vacancy defects was synthesized to integrate the functions of pollutant detection, adsorption, and photocatalytic degradation. The results showed that the nanocomposite could adsorb Cr3+and the process could be transduced into a colorimetric signal for qualitative and quantitative detection. The adsorbed heavy metal also ... 相似文献
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Solar energy-driven semiconductor photocatalysis has gathered increasing interest in the field of energy and environmental applications. However, a vital problem that limits its application is that photocatalysis requires a continuous light source to perform redox reaction. The ability of keeping catalytic activity in the dark has been the ultimate goal for the wide application of photocatalysis. More and more efforts have been paid to develop photocatalysts to perform photocatalytic reactions under both light and dark conditions, which is so called “round-the-clock photocatalytic system” (RTCPS). RTCPS with an ability of energy storage can work well under both daytime and nighttime, which widely used in the removal of heavy metal ion, the degradation of organic pollutant, disinfection and hydrogen generation. The important potential of RTCPS necessitate timely reviews of the recent advances to streamline efforts. Thus, this review aimed to summarize the recent advances in RTCPS, including the mechanism, characterization techniques and applications. Moreover, future challenge and research direction on the mechanistic study, material design and potential applications are also discussed. 相似文献
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TiO2光催化活性高,化学稳定性好,绿色环保及价廉等特点,在污水处理、有机污染物降解、催化制氢、抗菌抗癌及自清洁等方面有巨大的应用前景。然而TiO2半导体禁带宽,光谱范围小,光量子效率低等问题限制了其光催化性能。文章综述了TiO2光催化剂优化改性的研究进展,系统分析了TiO2半导体的结构特征与作用机理,以及TiO2光催化过程的影响因素,着重介绍了TiO2光催化剂多元优化改性方法的优势及不足,最后对未来发展新型TiO2基光催化剂提出了建议。 相似文献
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Dr. Sebastian Barata-Vallejo Dr. Al Postigo 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(49):11065-11084
Visible-light-photocatalyzed methods employed in synthetic transformations present attractive properties such as environmentally friendly, safety, availability and excellent functional group tolerance. In this regard, research on the visible-light photocatalytic incorporation of the trifluoromethyl CF3 moiety into organic substrates, in particular, has contributed to a clear evolution of the field of photocatalysis. Although this particular area is constantly evolving and has been reviewed, the last five years have experienced an outburst of seminal and significant photocatalytic trifluoromethylation examples that are leading the way and opening new synthetic avenues. Recent review articles on Ru- and Ir-based photocatalytic trifluoromethylation reactions have borne witness of this evolution. Although this account will show the new Ru- and Ir-based photocatalytic trifluoromethylations, Sections 2 and 3 will also illustrate other photocatalytic systems, such as organic dyes, organic semiconductors and newly-developed all-organic photocatalysts. All the known and reviewed strategies for photocatalytic trifluoromethylation reactions of olefins and (hetero)aromatic compounds will not be discussed but will be summarized in two figures (Figures 4 and 5), and new examples (2015–present) will be presented and discussed. 相似文献
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Dr. Hui Wang Dr. Shenlong Jiang Wenxiu Liu Prof. Xiaodong Zhang Prof. Qun Zhang Prof. Yi Luo Prof. Yi Xie 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(27):11186-11193
Excitonic processes in semiconductors open up the possibility for pursuing photocatalytic organic synthesis. However, the insufficient spin relaxation and robust nonradiative decays in semiconductors place restrictions on both quantum yield and selectivity of these reactions. Herein, by taking polymeric carbon nitride (PCN)/acetone as a prototypical system, we propose that extrinsic aliphatic ketones can serve as molecular co-catalysts for promoting spin-flip transition and suppressing non-radiative energy losses. Spectroscopic investigations indicate that hot excitons in PCN can be transferred to ketones, while triplet excitons in ketones can be transferred to PCN. As such, the PCN/ketone systems exhibit considerable triplet-exciton accumulation and extended visible-light response, leading to excellent performance in exciton-based photocatalysis, such as singlet oxygen generation. This work provides a fundamental understanding of energy harvesting in semiconductor/molecule systems, and paves the way for optimizing exciton-based photocatalysis via molecular co-catalyst design. 相似文献