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Preparation and Characterization of Three-dimensional Photocatalyst——TiO_2 Particulate Film Immobilized on activated carbon fibers

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过程工程学报 2006年第3期6卷 482-486页

作者：傅平丰栾勇戴学刚张建强张安华 Research Institute of Indoor Environment Beijing Union UniversityBeijing 100083China Institute of Process Engineering Chinese Academy of SciencesBeijing 100080China North China Mineral and Geology Testing Center of CNNC Tianjin 300181China

A novel three-dimensional photocatalyst, TiO2 particulate film immobilized on activated carbon fibers (TiO2/ACFs),was prepared by liquid phase deposittion. The photocatalyst was characterized by SEM, XRD, BET surface area and photodegradation of methylene blue solution. TiO2 particulate film, with a thickness of nearly 200 nm and grain sizes of 30～50 nm, was deposited on almost each carbon fiber. The inner space between adjacent fibers remained as unmodified ACFs,therefore, both UV illumination and polluted solutions were allowed to pass through the felt-form photocatalyst to form a three-dimensional environment for photocatalytic reactions. With BET surface areas of 400～600 m2/g, the TiO2/ACFs exhibited an enhanced adsorption of pollutants for photocatalysis. Comparative degradations indicated that photocatalytic activity of the TiO2/ACFs was slightly higher than that of Degussa P-25 TiO2. Two special properties, the three-dimensional structure and combined effects of ACFs' adsorption and titania's photodegradation, made contribution to high photocatalytic activity. Additionally, the TiO2/ACFs exhibited high stability and potentially application for practical usage.

关键词： liquid phase deposition TiO2 particulate film activated carbon fibers three-dimensional structure photocatalytic activity

PREPARATION OF TiO_2 PHOTOCATALYST ANCHORED ON activated carbon fibers AND ITS PHOTODEGRADATION OF METHYLENE BLUE

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China Particuology 2004年第2期2卷 76-80页

作者： PingfengFu YongLuan XuegangDai InstituteofProcessEngineering ChineseAcademyofSciencesBeijing100080P.R.China

TiO2 particulate photocatalyst anchored on activated carbon fibers (ACFs) was prepared by a molecular adsorption-deposition method. The TiO2 particles deposited on the carbon fibers formed a coating of about 100 nm in thickness. The photocatalyst prepared was characterized by means of SEM, EDS, XRD and UV-vis adsorption spec-troscopy. Anatase-type TiO2 was uniquely developed, and the micrographic structure of ACFs was not damaged during preparation. The roomy space between adjacent carbon fibers could allow UV-light to penetrate into the felt-form photocatalyst to a certain depth, so that a three dimensional environment was formed for the photocatalytic reaction. Such TiO2/ACFs photocatalyst exhibited its photocatalytic reactivity in photodegradation of concentrated methylene blue (MB) solutions. The MB molecules in the bulk solutions was supposed to be condensed around TiO2 particles by ad-sorption by ACFs. Therefore, the photocatalyst possesses the combined effect of adsorption by activated carbon fibers and photocatalytic reactivity of anatase-type TiO2 on MB photodegradation.

关键词： titanium dioxide photocatalyst activated carbon fibers preparation methylene blue photodegradation

Preparation and characterization of in-site regenerated TiO_2-ACFs photocatalyst

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International Journal of Minerals,Metallurgy and Materials 2011年第3期18卷 357-363页

作者： Rong Yang Jian-hua Liu Song-mei Li Engineering Design ＆ Research Institute of the Second Artillery Corps Beijing 100011 China School of Materials Science and Engineering Beihang University Beijing 100083 China

In-site regenerated titanium dioxide-activated carbon fibers （TiO2-ACFs） photocatalyst was prepared by the sol-gel method. De-tailed surface and structural characterization of the TiO2-ACFs photocatalyst was carried out. The photoactivity of TiO2-ACFs under ultra-violet irradiation was compared with original ACFs and pure TiO2 by the degradation of methylene blue aqueous solution. The degradation efficiency by the TiO2 （5wt%）-ACFs sample is much higher than that by TiO2 and ACFs. The results show that the photocatalysis by TiO2-ACFs is a six-step process. The adsorption-transfer-photocatalysis rate of TiO2-ACFs is higher than the adsorption-photocatalysis rate of TiO2, so the photocatalysis rate of the TiO2-ACFs system is higher than that of TiO2 photocatalyst.

关键词： photocatalysts photocatalysis microstructure titanium dioxide activated carbon fibers

Preparation and application of efficient TiO_2 /ACFs photocatalyst

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Journal of Environmental Sciences 2006年第5期18卷 979-982页

作者： LIU Jian-hua YANG Rong LI Song-mei School of Materials Science and Engineering Beihang University Beijing 100083 China

activated carbon fibers （ACFs） supported titanium dioxide （TiO2） photocatalyst was developed by sol-gel method. The surface morphology and microstructure of the photocatalyst were characterized with scan electron microscope（SEM）, X-ray diffraction patterns and specific surface area analysis. The prepared photocatalyst is specially helpful for the removal of low molecular weight organic pollutants in wastewater. Decomposition efficiency of methylene blue solution by TiO2/ACFs catalyst reached almost 100% under 60 min reaction, while the decomposition efficiency by pure TiO2 was only 25% under 3 h reaction. The mineralization of toluene aqueous solution was measured by total organic carbon instrument, and the evolution of intermediate species was detected by gas chromatograph instrument. The results indicated that the prepared photocatalyst not only enhanced the photoactivity of TiO2, but also suppressed the emergence of intermediate species, which may be more deleterious to human. The enhancement of photocatalysis was due to increased efficiency of adsorption and desorption, which were control steps in heterogeneous photocatalysis.

关键词： titanium dioxide activated carbon fibers photocatalysis toluene methylene blue

电Fenton法对硝基酚和氯酚模拟废水的降解研究

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电Fenton法对硝基酚和氯酚模拟废水的降解研究

作者：袁松虎华中科技大学

学位级别：硕士

Wastewater containing phenols is toxic to microorganism, so traditional biochemical methods are not fit. It is of great value to develop an alternative method to degrade the water. As an advanced oxidation process, electro-Fenton method has been studied in recent years. In this article, simulated nitrophenol and chlorophenol wastewater were treated by electro-Fenton method. Firstly, anodic Fenton method was investigated to degrade simulated nitrophenol wastewater using activated carbon fibers（ACF） as cathode and Fe as anode with the introduction of aeration. The optimal electrolysis conditions were found to be 3.6g/L NaCl, pH3.0 and 10v electrolysis voltage, the corresponding removal of 4NP and CODCr were 82.8% and 72.0% respectively. Zero-order reaction kinetics was observed, the degradation pathway and energy consumption were also discussed. In the second part, pentachlorophenol（PCP） was treated by electro-Fenton method, which employed graphite as cathode and Pt as anode with the addition of Fe ion. In the optimal conditions of 5v electrolysis voltage, 0.14mol/L Na2SO4 and pH2.5, addition of Fe ions could absolutely accelerate the process. Reaction mechanism was analyzed detailedly by the determination of intermediates and chloride. Intermediate products like 1,2-tetrachlorocatchaol, 1,4-tetrachlorocatchaol and tetrachloro-p-hydroquin- one were detected by GC/MS. Pseudo first-order reaction kinetics appeared in the fist stage and the constant was 0.019min-1. Finally, in the optimal conditions of electro-Fenton system, various chlorophenols were treated to research the relationship between chlorine content and degradation rate. The sequence of rate constant was obtained to be: 2,4-dichlorophenol（2,4-DCP）＞ 2,4,6-trichlorophenol（2,4,6-TCP）＞PCP＞4-chloroph

关键词： anodic Fenton electro-Fenton activated carbon fibers Nitrophenol Chlorophenols