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Non‑Magnetic Bimetallic MOF‑Derived Porous Carbon‑Wrapped TiO2/ ZrTiO4 Composites for Efficient Electromagnetic Wave Absorption 认领 引用 被引量：28
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作者 Jing Qiao Xue Zhang +7 位作者 Chang Liu Longfei Lyu Yunfei Yang Zhou Wang Lili Wu Wei Liu Fenglong Wang Jiurong Liu 《Nano-Micro Letters》 SCIE EI CAS CSCD 2021年第5期45-60,共16页
Modern communication technologies put forward higher requirements for electromagnetic wave(EMW)absorption materials.Metal-organic framework(MOF)derivatives have been widely concerned with its diverse advantages.To bre... Modern communication technologies put forward higher requirements for electromagnetic wave(EMW)absorption materials.Metal-organic framework(MOF)derivatives have been widely concerned with its diverse advantages.To break the mindset of magneticderivative design,and make up the shortage of monometallic non-magnetic derivatives,we first try non-magnetic bimetallic MOFs derivatives to achieve efficient EMW absorption.The porous carbon-wrapped TiO2/ZrTiO4 composites derived from PCN-415(TiZr-MOFs)are qualified with a minimum reflection loss of−67.8 dB(2.16 mm,13.0 GHz),and a maximum effective absorption bandwidth of 5.9 GHz(2.70 mm).Through in-depth discussions,the synergy of enhanced interfacial polarization and other attenuation mechanisms in the composites is revealed.Therefore,this work confirms the huge potentials of nonmagnetic bimetallic MOFs derivatives in EMW absorption applications. 展开更多
关键词 Bimetallic metal-organic framework PCN-415 MOF derivatives TiO2/ZrTiO4/C composites Electromagnetic wave absorption
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Photocatalytic activity and kinetics for acid yellow degradation over surface composites of TiO_2-coated activated carbon under different photocatalytic conditions 认领 引用 被引量：4
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作者 曾孟雄 李佑稷 +2 位作者 马明远 陈伟 李雷勇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第4期1019-1027,共9页
TiO2-coated activated carbon surface （TAs） composites were prepared by a sol-gel method with supercritical pretreatment. The photocatalytic degradation of acid yellow （AY） was investigated under UV radiation to es... TiO2-coated activated carbon surface （TAs） composites were prepared by a sol-gel method with supercritical pretreatment. The photocatalytic degradation of acid yellow （AY） was investigated under UV radiation to estimate activity of catalysts and determine the kinetics. And the effects of parameters including the initial concentration of AY, light intensity and TiO2 content in catalysts were examined. The results indicate that TAs has a higher efficiency in decomposition of AY than P25, pure TiO2 particles as well as the mixture of TiO2 powder and active carbon. The photocatalytic degradation rate is found to follow the pseudo-first order kinetics with respect to the AY concentration. The new kinetic model fairly resembles the classic Langmuir-Hinshelwood equation, and the rate constant is proportional to the square root of the light intensity in a wide range. However, its absorption performance depends on the surface areas of catalysts. The model fits quite well with the experimental data and elucidates phenomena about the effects of the TiO2 content in TAs on the degradation rate. 展开更多
关键词 photocatalysis TiO2-coated activated carbon acid yellow composite catalyst
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Fabrication of Bi_2O_3/TiO_2nanocomposites and their applications to the degradation of pollutants in air and water under visible-light 认领 引用 被引量：8
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作者 Ashok Kumar Chakraborty Md Emran Hossain +1 位作者 Md Masudur Rhaman K M A Sobahan 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2014年第2期458-465,共8页
A nanoheterojunction composite photocatalyst Bi2O3/TiO2 working under visible-light （λ≥ 420 nm） was prepared by combining two semiconductors Bi2O3 and TiO2 varying the Bi2O3/TiO2 molar ratio. Maleic acid was emplo... A nanoheterojunction composite photocatalyst Bi2O3/TiO2 working under visible-light （λ≥ 420 nm） was prepared by combining two semiconductors Bi2O3 and TiO2 varying the Bi2O3/TiO2 molar ratio. Maleic acid was employed as an organic binder to unite Bi2O3 and TiO2 nanoparticles. The SEM, TEM, XRD and diffuse reflectance spectra were utilized to characterize the prepared Bi2O3/TiO2 nanoheterojunction. The nanocomposite exhibited unusual high photocatalytic activity in decomposing 2-propanol in gas phase and phenol in aqueous phase and, evolution of CO2 under visible light irradiation while the end members exhibited low photocatalytic activity. The composite was optimized to 5 mol% Bi2O3/TiO2. The remarkable high photocatalytic efficiency originates from the unique relative energy band position of Bi2O3 and TiO2 as well as the absorption of visible light by Bi2O3. 展开更多
关键词 nanoheterojunction Bi2O3/TiO2 composite photocatalyst pollutants visible-light
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Complex Impedance Spectra Analysis of SnO_2-glaze Composites 认领 引用 被引量：3
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作者 颜东亮 吴建青 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2006年第4期121-125,共5页
SnO2-glaze composites were prepared by Sb-doped SnO2 and SiO2-CaO-Al2O3-B2O3 glaze. The composites changed from an electrical insulator to a conductor as the SnO2 content increased from Owt% to 90 wt% . The complex im... SnO2-glaze composites were prepared by Sb-doped SnO2 and SiO2-CaO-Al2O3-B2O3 glaze. The composites changed from an electrical insulator to a conductor as the SnO2 content increased from Owt% to 90 wt% . The complex impedance spectra of the fabricated composites were investigated in the frequency range of 100Hz-40 MHz and three kinds of typical shape of complex impedance spectra were recorded and analyzed. The ,spectrum is quite close to the model of conduction via nonohmic contactiug when the SnO2 content is relatively low, In high loading region, the spectrum shows the conduction pattern through ohmic contact chains . In the moderate loading region, the model is a mixture of the above two models. Equivalent circuit of the composite changes from resistor-capacitor circuit to resistor-inductor circuit as the content of SnO2 increases. 展开更多
关键词 SnO2-glaze composites impedance spectra conduction model
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TiO_2/polyaniline composites:An efficient photocatalyst for the degradation of methylene blue under natural light 认领 引用 被引量：13
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作者 Fang Wang Shi Xiong Min 《Chinese Chemical Letters》 SCIE CAS 2007年第10期1273-1277,共5页
Polyaniline （PAn） sensitized nanocrystalline TiO2 composites （TiO2/PAn） were successfully prepared and used as an efficient photocatalyst for the degradation of dye methylene blue （MB）. The results showed that P... Polyaniline （PAn） sensitized nanocrystalline TiO2 composites （TiO2/PAn） were successfully prepared and used as an efficient photocatalyst for the degradation of dye methylene blue （MB）. The results showed that PAn was able to sensitize TiO2 efficiently and the composite photocatalyst could be activated by absorbing both the ultraviolet and visible light （λ： 190 ～ 800 nm）, whereas pure TiO2 absorbed ultraviolet light only （λ 〈 380 nm）. Under the irradiation of natural light, MB could be degraded more efficiently on the TiO2/PAn composites than on the TiO2 Furthermore, it could be easily separated from the solution by simple sedimentation. 展开更多
关键词 TiO2/PAn Composite photocatalyst Methylene blue Degradation Natural light
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Facile fabrication of TiO_2 nanoparticle–TiO_2 nanofiber composites by co-electrospinning–electrospraying for dye-sensitized solar cells 认领 引用 被引量：1
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作者 G.S.Anjusree T.G.Deepak +1 位作者 Shantikumar V Nair A.Sreekumaran Nair 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第6期762-769,共8页
We report a facile method for the fabrication of TiO2 nanofiber-nanoparticle composite （FP） via. simulta- neous electrospraying and electrospinning for dye-sensitized solar cell （DSC） applications. The loading of ... We report a facile method for the fabrication of TiO2 nanofiber-nanoparticle composite （FP） via. simulta- neous electrospraying and electrospinning for dye-sensitized solar cell （DSC） applications. The loading of nanoparticles on the fibers is controlled by varying their feed rates during electrospinning. The FP composites having three different particle loading are prepared by the methodology and the FP with the highest particle loading （denoted as FP-3 in the manuscript） showed the best overall efficiency of 9.15% in comparison to the other compositions of the FP （FP-2, 8.15% and FP-1, Z51%, respectively） and nanofibers （F） and nanoparticles （P） separately （7.21 and 7.81, respectively）. All the material systems are characterized by spec- troscopy, microscopy, surface area measurements and the devices are characterized by current-voltage （I-V）, incident photon-to-current conversion efficiency （IPCE）, electrochemical impedance measurements, etc. I-V, dye-loading and reflectance measurements throw light on the overall performance of the DSC devices. 展开更多
关键词 TiO2 nanofiber-nanoparticle composites Co-electrospraying-electrospinning Dye-sensitized solar cell Current-voltage measurements
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Preparation and electrocatalytic property of Au-Pt/SnO2/GC composite electrode 认领 引用
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作者 YU Zhihui XIE Jia +2 位作者 BAI Jie TIAN Mi XIA Dingguo 《Rare Metals》 SCIE EI CAS 2009年第4期350-354,共5页
Au-Pt/SnO2/GC composite electrode was prepared by self-assembling Au-Pt nanoparticles on SnO2 film,which was deposited on actived glassy carbon(GC).Atomic force microscopy(AFM)and scanning electron microscopy(SEM)imag... Au-Pt/SnO2/GC composite electrode was prepared by self-assembling Au-Pt nanoparticles on SnO2 film,which was deposited on actived glassy carbon(GC).Atomic force microscopy(AFM)and scanning electron microscopy(SEM)images revealed that dense and uniform Au-Pt particles with 25-nm diameter were dispersed on SnO2 film.X-ray photoelectron spectroscopy(XPS)results proved that there was an interaction between Au-Pt nanoparticles and SnO2 support.Electrochemical experiments showed that Au-Pt/SnOz/GC composite electrode had a good electrocatalytic activity to the oxidation of methanol. 展开更多
关键词 electrochemistry composite electrode self-assembling Au-Pt SnO2 methanol oxidation
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Photocatalytic and Thermal Insulating Performances of Fiber Reinforced Hierarchical TiO_2/SiO_2 Xerogel Composites Synthesized by Ambient Drying Route 认领 引用
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作者 徐海珣 赵善宇 +2 位作者 郑猛 贾佳佳 朱平华 《Journal of Donghua University(English Edition)》 CAS 2017年第4期570-576,共7页
Silica( SiO_2) based aerogel/xerogel materials have been received ever-growing attentions for versatile applications. However,the widespread applications are narrowed by the inert properties,fragile and brittle nature... Silica( SiO_2) based aerogel/xerogel materials have been received ever-growing attentions for versatile applications. However,the widespread applications are narrowed by the inert properties,fragile and brittle natureof silica materials and cumbersome preparation processes. In this paper,titania( TiO_2) was introduced into SiO_2 matrix to form photocatalytic hybrid gels. The TiO_2/SiO_2 composites were then reinforced by the impregnation of various fibrillary reinforcements,such as glass,mullite mineral and ceramic fibers. The properties of the composites were studied systematically in terms of fiberstability,microstructure,chemical interaction and thermal conductivity. The final xerogel composites displayed improved monolithic geometry,satisfied thermal conductivity(0. 09-0. 25 W·m-1·K-1) and optimized photocatalytic performance(85% removal of model pollutant of methyl orange( Mo)),which could be expected to be a feasible route to multi-functional building facades in the future. 展开更多
关键词 titania-silica（TiO2/SiO2） composite photocatalytic thermal conductivity fiber reinforcement
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Synthesis of graphene/tourmaline/TiO_2 composites with enhanced activity for photocatalytic degradation of 2-propanol 认领 引用 被引量：8
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作者 Lili Yin Ming Zhao +2 位作者 Huilin Hu Jinhua Ye Defa Wang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第8期1307-1314,共8页
We report the construction of a grapheneourmaline/TiO2(G/T/TiO2)composite system with enhanced charge‐carrier separation,and therefore enhanced photocatalytic properties,based on tailoring the surface‐charged state ... We report the construction of a grapheneourmaline/TiO2(G/T/TiO2)composite system with enhanced charge‐carrier separation,and therefore enhanced photocatalytic properties,based on tailoring the surface‐charged state of graphene and/or by introducing an external electric field arising from tourmaline.A simple two‐step hydrothermal method was used to synthesize G/T/TiO2composites and poly(diallyldimethylammonium chloride)‐G/T/TiO2composites.In the photocatalytic degradation of2‐propanol(IPA),the catalytic activity of the composite containing negatively charged graphene was higher than of the composite containing positively charged graphene.The highest acetone evolution rate(223?mol/h)was achieved using the ternary composite with the optimum composition,i.e.,G0.5/T5/TiO2(0.5wt%graphene and5wt%tourmaline).The involvement of tourmaline and graphene in the composite is believed to facilitate the separation and transportation of electrons and holes photogenerated in TiO2.This synergetic effect could account for the enhanced photocatalytic activity of the G/T/TiO2composite.A mechanistic study indicated that O2??radicals and holes were the main reactive oxygen species in photocatalytic degradation of IPA. 展开更多
关键词 Photocatalysis Graphene Tourmaline TiO2 Composite 2‐Propanol Degradation
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The Effects of TiO2 Particle Size on the Properties of PTFE/TiO2 Composites 认领 引用 被引量：3
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作者 Fuchuan Luo Ying Yuan +2 位作者 Bin Tang Jun Yang Shuren Zhang 《Journal of Materials Science and Chemical Engineering》 2017年第7期53-60,共8页
TiO2 filled polytetrafluoroethylene (PTFE) composite were fabricated for microwave circuit applications. PTFE/TiO2 composites were prepared by cold pressing and hot treating. The particle size of TiO2 varied from 5 μ... TiO2 filled polytetrafluoroethylene (PTFE) composite were fabricated for microwave circuit applications. PTFE/TiO2 composites were prepared by cold pressing and hot treating. The particle size of TiO2 varied from 5 μm to 11 μm.TiO2 powders with different sizes were prepared by the solid state ceramic route. The effects of TiO2 particle size on the microstructure, density, moisture absorption, thermal conductivity and microwave dielectric properties of PTFE/TiO2 composites were investigated. The density showed an increasing trend as the TiO2 particle size increased, while the dielectric loss (tanδ) and moisture absorption decreased with the increase of TiO2 particle size. The dielectric constant (εr) and thermal conductivity (λ) decreased up to D50 = 6.5 μm and then sharply increased. Good properties with values of εr = 6.8, tanδ = 0.0012 and λ = 0.533 W?m?1?K?1 were obtained in PTFE/TiO2 composites when the particle size of TiO2 was 11 μm. 展开更多
关键词 PTFE/TiO2 Composite Powders Microwave Dielectric Properties
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Effects of CaTiO3 Loading on the Properties of PTFE/TiO2 Composites 认领 引用
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作者 Bin Tang Fuchuan Luo +2 位作者 De Zhou Ying Yuan Shuren Zhang 《Journal of Materials Science and Chemical Engineering》 2017年第7期45-52,共8页
In this paper, a detailed study was carried out on the PTFE reinforced with TiO2 and CaTiO3. The filler content of ceramic powder was a fixed value of 61 wt% and the content of CaTiO3 in PTFE matrix varied from 0 wt% ... In this paper, a detailed study was carried out on the PTFE reinforced with TiO2 and CaTiO3. The filler content of ceramic powder was a fixed value of 61 wt% and the content of CaTiO3 in PTFE matrix varied from 0 wt% to 16 wt% with a step size of 4 wt%. The effects of CaTiO3 loading on the density, moisture absorption, thermal expansion, microstructure and microwave dielectric properties were investigated. As CaTiO3 loading content increased from 0 wt% to 16 wt%, the thermal expansion initially displayed a sharp increase, and showed a slight enhancement when the content of CaTiO3 exceeded 12 wt%. The density experienced a continuous decrease with the addition of CaTiO3. The moisture absorption displayed a steady increase with the increasing CaTiO3 loading amount. The changing of dielectric constant (εr) and loss tangent (tanδ) were similar to that of the moisture absorption in a manner. Good dielectric properties with values of εr = 11.60, tanδ = 0.002 were obtained in the PTFE matrix with 16 wt% CaTiO3 and 45 wt% TiO2. 展开更多
关键词 Composites TiO2 PTFE CaTiO3 Dielectric Properties
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Thermal and Structural Analyses of PMMA/TiO2Nanoparticles Composites 认领 引用 被引量：3
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作者 Nabawia A. El-Zaher Mohamed S. Melegy Osiris W. Guirguis 《Natural Science》 2014年第11期859-870,共12页
In the present work, composites of poly (methyl methacrylate)itanium oxide nanoparticles (100/0, 97.5/2.5, 95/5, 92.5/7.5, 90/10 and 0/100 wt/wt%)were prepared to be used as bioequivalent materials according to their ... In the present work, composites of poly (methyl methacrylate)itanium oxide nanoparticles (100/0, 97.5/2.5, 95/5, 92.5/7.5, 90/10 and 0/100 wt/wt%)were prepared to be used as bioequivalent materials according to their importance broad practical and medical applications. Thermal properties as well as X-ray diffraction analyses were employed to characterize the structure properties of such composite. The obtained results showed variations in the glass transition temperature (Tg), the melting temperature (Tm), shape and area of thermal peaks which were attributed to the different degrees of crystallinity and the existence of interactions between PMMA and TiO2 nanoparticle molecules. The XRD patterns showed sharpening of peaks at different concentrations of nano-TiO2 powder with PMMA. This indicated changes in the crystallinity/amorphosity ratio, and also suggested that the miscibility between the amorphous components of homo- polymers PMMA and nano-TiO2 powder is possible.The results showed that nano-TiO2 powder mix with PMMA can improve the thermal stability of the homo-polymer under investigation, lead- ing to interesting technological applications. 展开更多
关键词 Poly(methyl methacrylate) Nano-Titanium Dioxide Powder PMMA/TiO2 Nanoparticle Composites Differential Scanning Calorimetry (DSC) Thermogravimetric Analysis (TGA) X-Ray Diffraction (XRD)
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SnO_2/TiO_2复合纳米纤维的制备及光催化性能 认领 引用 被引量：33
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作者 李跃军 曹铁平 +1 位作者 王长华 邵长路 《高等学校化学学报》 SCIE CAS CSCD 北大核心 2011年第4期822-827,共6页
采用静电纺丝技术,以聚乙烯吡咯烷酮和钛酸正丁酯为前驱体,制得锐钛矿相TiO2纳米纤维,并以此为模板,采用水热方法制备了具有异质结构的SnO2/TiO2复合纳米纤维.利用扫描电子显微镜(SEM)、X射线能量色散光谱(EDS)、透射电子显微镜(TEM)和... 采用静电纺丝技术,以聚乙烯吡咯烷酮和钛酸正丁酯为前驱体,制得锐钛矿相TiO2纳米纤维,并以此为模板,采用水热方法制备了具有异质结构的SnO2/TiO2复合纳米纤维.利用扫描电子显微镜(SEM)、X射线能量色散光谱(EDS)、透射电子显微镜(TEM)和X射线衍射(XRD)等分析测试手段对产物形貌和结构进行了表征.结果表明,SnO2纳米粒子均匀地生长在TiO2纳米纤维表面,形成了异质结构的SnO2/TiO2复合纳米纤维.通过改变反应物浓度,能有效地实现SnO2/TiO2复合纳米纤维的可控合成.以罗丹明B为模拟污染物,考察了SnO2/TiO2复合纳米纤维的光催化性能,结果表明,该复合纳米纤维的光催化活性明显高于纯TiO2纳米纤维,初步探讨了光催化反应机理. 展开更多
关键词 SnO2/TiO2复合纳米纤维 静电纺丝技术 水热方法 可控合成 光催化性能
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TiO_2/PtO-Pt复合膜和SnO_2/PtO-Pt复合膜氢敏性能的研究 认领 引用 被引量：10
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作者 牟勇燕 杜雪岩 +2 位作者 王远 郭洪猷 桂琳琳 《化学学报》 SCIE CAS 北大核心 2003年第1期8-12,共5页
将PtO Pt纳米粒子膜与TiO2 ,SnO2 纳米粒子膜复合 ,利用PtO Pt纳米粒子膜作为插入电极和催化剂 ,设计并研制出一类新型双层结构复合膜气体传感器 .采用TEM和SEM对薄膜的显微结构进行了表征 .对空气中 4 0 %H2 的氢敏性能研究表明 :2 0 ... 将PtO Pt纳米粒子膜与TiO2 ,SnO2 纳米粒子膜复合 ,利用PtO Pt纳米粒子膜作为插入电极和催化剂 ,设计并研制出一类新型双层结构复合膜气体传感器 .采用TEM和SEM对薄膜的显微结构进行了表征 .对空气中 4 0 %H2 的氢敏性能研究表明 :2 0 0℃时 ,TiO2 /PtO Pt复合膜对氢气的灵敏度为 70 % ,而TiO2 纳米粒子膜无响应 .10 0℃时 ,SnO2 /PtO Pt复合膜的灵敏度为 92 % ,同样条件下 ,SnO2 纳米粒子膜的灵敏度仅为 4% .说明PtO Pt纳米粒子膜的催化作用能够显著提高TiO2 和SnO2 膜的氢敏性能 .另外 ,TiO2 /PtO Pt复合膜和SnO2 /PtO Pt复合膜均对空气中H2 展开更多
关键词 TiO2/PtO-Pt复合膜 SnO2/PtO-Pt复合膜 氢敏性能 PtO-Pt纳米粒子膜 TiO2薄膜 SnO2薄膜 氢气传感器 空气 氢气浓度 检测
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TiO_2/SnO_2复合氧化物的制备和光谱特性 认领 引用 被引量：15
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作者 刘成林 钟菊花 +1 位作者 李远光 张兆奎 《光谱学与光谱分析》 SCIE EI CAS 北大核心 2005年第12期1947-1949,共3页
为了研究TiO2／SnO2复合氧化物的光学特性,用胶体化学方法制备了以SnO2为内核的TiO2／SnO2 复合氧化物,并且用紫外-可见光吸收光谱、X射线衍射和红外光谱对TiO2／SnO2复合氧化物的特性进行了 分析。结果显示:TiO2和TiO2／SnO2的能带宽... 为了研究TiO2／SnO2复合氧化物的光学特性,用胶体化学方法制备了以SnO2为内核的TiO2／SnO2 复合氧化物,并且用紫外-可见光吸收光谱、X射线衍射和红外光谱对TiO2／SnO2复合氧化物的特性进行了 分析。结果显示:TiO2和TiO2／SnO2的能带宽度分别为4．13和3．86 eV,表现出量子尺寸效应;TiO2／SnO2 在紫外区域具有宽的强吸收带。X射线衍射中TiO2的(110)衍射峰的位置移动了1．6°,强度也发生了变化; 与TiO2红外光谱相比,TiO2／SnO2中Ti-O键的伸缩振动由500 cm-1移到了656 cm-1,并有560 cm-1的肩 峰,与吸附水相应的1 650 cm-1附近的吸收峰和3 420 cm-1的吸收峰均有所增加。 展开更多
关键词 TiO2/SnO2 复合氧化物 制备 特性
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SnO_2掺杂TiO_2静电自组装薄膜的制备及性能 认领 引用 被引量：7
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作者 潘锋 张俊英 +2 位作者 郝维昌 王天民 郑树凯 《稀有金属材料与工程》 SCIE EI CAS 北大核心 2005年第5期734-737,共4页
采用静电自组装工艺在石英衬底上制备了SnO2掺杂的TiO2薄膜,利用原子力显微镜(AFM),X射线光电子能谱(XPS),紫外可见分光光度计(UV-Vis)表征了薄膜的微结构及性能。薄膜的吸收光谱及光催化实验结果表明,SnO2掺杂可以明显改善薄膜的光吸收... 采用静电自组装工艺在石英衬底上制备了SnO2掺杂的TiO2薄膜,利用原子力显微镜(AFM),X射线光电子能谱(XPS),紫外可见分光光度计(UV-Vis)表征了薄膜的微结构及性能。薄膜的吸收光谱及光催化实验结果表明,SnO2掺杂可以明显改善薄膜的光吸收,提高TiO2薄膜的光催化性能。 展开更多
关键词 静电自组装 TiO2 SnO2掺杂 光吸收 光催化
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溶胶-凝胶制备SnO_2/TiO_2复合材料及其性能研究 认领 引用 被引量：6
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作者 汪冬梅 吴玉程 +4 位作者 吕珺 徐光青 刘君武 汤文明 郑治祥 《功能材料》 EI CAS 北大核心 2008年第6期926-930,共5页
采用溶胶-凝胶工艺制备了SnO2／TiO2复合光催化剂。以钛酸丁脂（Ti（C4H9O）4）为前驱体，冰醋酸为螯合剂，通过水解缩聚反应制备纳米TiO2，掺杂不同比例（n（SnO2）／n（TiO2）分别为1％、2．5％、5％）的SnO2对纳米TiO2进行改性，并对... 采用溶胶-凝胶工艺制备了SnO2／TiO2复合光催化剂。以钛酸丁脂（Ti（C4H9O）4）为前驱体，冰醋酸为螯合剂，通过水解缩聚反应制备纳米TiO2，掺杂不同比例（n（SnO2）／n（TiO2）分别为1％、2．5％、5％）的SnO2对纳米TiO2进行改性，并对1％掺杂的粉体样品进行了不同温度（350～550℃）的焙烧处理。采用浸渍提拉法制备了1％（n（SnO2）／n（TiO2））掺杂的纳米SnO2／TiO2膜。运用X射线衍射（XRD）、透射电镜（TEM）、X射线光电子能谱（XPS）、原子力显微镜（AFM）及光吸收等手段，研究了不同掺杂量、热处理温度及光照时间对TiO2相变和光催化活性的影响。研究结果表明，350℃焙烧时，1％（n（SnO2）／n（TiO2））掺杂的粉体样品出现了合适比例的锐钛矿型和金红石型的混晶结构，具有较高的光催化效率，可达96．55％。而1％（n（SnO2）／n（TiO2））掺杂的纳米SnO2／TiO2光催化膜晶粒尺寸在20～30nm左右，光催化效率为79．6％，低于相同掺杂含量的纳米SnO2／TiO2掺杂光催化剂粉体。 展开更多
关键词 溶胶-凝胶法 SnO2掺杂 浸渍提拉法 复合 SnO2/TiO2 光催化
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超临界流体干燥法制备纳米TiO_2-SnO_2-SiO_2复合光催化剂及其光催化性能研究 认领 引用 被引量：17
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作者 张敬畅 李青 曹维良 《无机化学学报》 SCIE CAS 北大核心 2004年第6期725-730,共6页
TiO2-SnO2-SiO2 nanocomposite photocatalysts were prepared with Na2SiO3·9H2O, SnCl4·5H2O and TiCl4 as precursors by chemistry coating processes and supercritical fluid drying (SCFD) method. Characterizations ... TiO2-SnO2-SiO2 nanocomposite photocatalysts were prepared with Na2SiO3·9H2O, SnCl4·5H2O and TiCl4 as precursors by chemistry coating processes and supercritical fluid drying (SCFD) method. Characterizations with XRD, TEM, NMR and FTIR showed that in addition to anatase type TiO2, a new active phase(Ti,Sn)O2 was also formed in the range of the studied doping concentration, The catalytic activity was evaluated by photocatalytic degradation of phenol as model reaction. SiO2 remained amphorous at all samples. It could prevent from growth of the size of nanopaticle and transformation from anatase to rutile. Compared with pure TiO2, or TiO2-SnO2 catalyst prepared by Sol-gel method, Nano-composite photo-catalyst showed significant improvement in catalytic activity, the photo-catalytic degradation rate of phenol in 7 h reached 88.7%. Application of the composite catalysts for the photocatalytic decomposition of phenol not only gave the same activity relative to pure ultrafine TiO2, but also reduced cost. The experimental results also proved that the thermal stability of TiO2 was greatly enhanced after mixing with small amount of SiO2. The optimized doping of SiO2 was 20.3%. The photo-catalyst prepared by SCFD combination technology was characterized with smaller particle size, larger surface area and higher activity. 展开更多
关键词 超临界流体干燥法 纳米材料 TiO2 SnO2 SiO2 光催化剂
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Preparation and characterization of ZrO_2/TiO_2 composite photocatalytic film by micro-arc oxidation 认领 引用 被引量：9
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作者 罗强 蔡启舟 +4 位作者 李欣蔚 潘振华 李玉洁 陈喜娣 严青松 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第10期2945-2950,共6页
ZrO2/TiO2 composite photocatalytic film was produced on the pure titanium substrate using in-situ Zr（OH）4 colloidal particle by the micro-arc oxidation technique and characterized by scanning electron microscope （... ZrO2/TiO2 composite photocatalytic film was produced on the pure titanium substrate using in-situ Zr（OH）4 colloidal particle by the micro-arc oxidation technique and characterized by scanning electron microscope （SEM）, energy dispersive X-ray （EDX）, X-ray diffraction （XRD） and ultraviolet-visible （UV-Vis） spectrophotometer. The composite film shows a lamellar and porous structure which consists of anatase, futile and ZrO2 phases. The optical absorption edge of film is shifted to longer wavelength when ZrO2 is introduced to TiO2. Furthermore, the photocatalytic reaction rate constants of degradation of rhodamine B solution with ZrO2/TiO2 composite film and pure TiO2 film under ultraviolet irradiation are measured as 0.0442 and 0.0186 h 1, respectively. 展开更多
关键词 pure titanium micro-arc oxidation Zr（OH）4 colloidal particle ZrO2/TiO2 composite photocatalytic film
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SnO_2TiO_2复合半导体纳米薄膜的研究进展 认领 引用 被引量：16
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作者 尚静 谢绍东 刘建国 《化学进展》 SCIE CAS 北大核心 2005年第6期1012-1018,共7页
本文概述了SnO2TiO2复合半导体纳米薄膜的发展历史和研究现状,对比分析了“混合”、“核壳”和“叠层”3种复合薄膜的结构和性能特点,着重论述了叠层结构的SnO2/TiO2复合薄膜的光电化学和光催化特性。结合作者的研究工作,探讨了SnO2/TiO... 本文概述了SnO2TiO2复合半导体纳米薄膜的发展历史和研究现状,对比分析了“混合”、“核壳”和“叠层”3种复合薄膜的结构和性能特点,着重论述了叠层结构的SnO2/TiO2复合薄膜的光电化学和光催化特性。结合作者的研究工作,探讨了SnO2/TiO2双层复合薄膜上下层厚度对其光催化活性的影响,指出复合薄膜光催化活性的提高可归因于电子从TiO2向SnO2的迁移。最后对SnO2/TiO2复合薄膜的局限性和发展潜势做一简要分析,强调了该复合薄膜本身的应用特点。 展开更多
关键词 SnO2 TiO2 复合半导体薄膜 光催化
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