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Simulated-sunlight-activated photocatalysis of Methylene Blue using cerium-doped SiO_2/TiO_2 nanostructured fibers 认领 引用 被引量：11
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作者 Yu Liu Hongbing Yu +5 位作者 Zhenning Lv Sihui Zhan Jiangyao Yang Xinhong Peng Yixuan Ren Xiaoyan Wu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第10期1867-1875,共9页
Cerium-doped SiO2/TiO2 nanostructured fibers were fabricated by electrospinning technology. The prepared fibers were characterized by thermogravimetric analysis （TGA）, scanning electron microscopy （SEM）, X-ray dif... Cerium-doped SiO2/TiO2 nanostructured fibers were fabricated by electrospinning technology. The prepared fibers were characterized by thermogravimetric analysis （TGA）, scanning electron microscopy （SEM）, X-ray diffraction （XRD） and Fourier transform infrared spectroscopy （FT-IR）. Using the fibers as catalysts, photoeatalytic degradation of Methylene Blue （MB） aqueous solution was carded out under simulated sunlight. The 0.2% Ce doping proved to be the optimal concentration for the doping of TiO2/SiO2, compared to other Ce-doped molar concentrations. The 0.2% Ce-doped SiOdTiO2 fibers exhibited higher photocatalytic activity than industrial Degussa P25 and the samples doped with only Ce or SIO2. The reasons for improving the photocatalytic activity were also discussed. Several operational parameters were studied, which showed that the photocatalytic efficiency of MB was influenced by parameters such as the initial dye concentration, the initial pH, inorganic anions, and so on. In addition, the influences of an electron acceptor and a radical scavenger suggested that OH was the dominant photooxidant during the photocatalytic process. The reuse evaluation of the fibers indicated that their photocatalytic activity had good stability. 展开更多
关键词 photocatalysis SiO2/TiO2 cerium nanostructured fibers Methylene Blue
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Synthesis of iron(Ⅲ)-doped nanostructure TiO_2/SiO_2 and their photocatalytic activity 认领 引用 被引量：11
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作者 CHEN Rufen ZHANG Lei +2 位作者 SONG Xiuqin WEI YU HOU Denglu 《Rare Metals》 SCIE EI CAS 2007年第6期565-571,共7页
Iron（Ⅲ）-doped nanostructure TiO2-coated SiO2 （TiO2/SiO2） particles were prepared using the layer-by-layer assembly technique and their photocatalytic property was studied. TiO2 colloids were synthesized employing... Iron（Ⅲ）-doped nanostructure TiO2-coated SiO2 （TiO2/SiO2） particles were prepared using the layer-by-layer assembly technique and their photocatalytic property was studied. TiO2 colloids were synthesized employing the sol-gel method with TiChas a precursor. The samples were characterized by Fourier transform infrared spectroscopy （FTIR）, SEM, EDS, XPS, and XRD. The experimental results show that TiO2 nanopowders on the surface of SiO2 particles are well distributed, the amount of TiO2 is increased with the adding of coating layers, the pure anatase-TiO2 coating layers are synthesized at 500℃, and the photocatalytic activity of Fe^3＋-doped TiO2/SiO2 is higher than that of undoped TiO2/SiO2. 展开更多
关键词 TiO2 coating SiO2 particle nanostructure layer-by-layer assembly doping photocatalytic activity
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Boosting sodium storage of mesoporous TiO2 nanostructure regulated by carbon quantum dots 认领 引用 被引量：2
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作者 Minghong Wu Yanping Gao +2 位作者 Yu Hu Bing Zhao Haijiao Zhang 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第3期897-902,共6页
It has been demonstrated that the conductivity and electrochemical properties of TiO2 nanomate rials can be significantly improved by an incorporation of carbon additives.In the study,we develop a novel Ndoped TiO2 me... It has been demonstrated that the conductivity and electrochemical properties of TiO2 nanomate rials can be significantly improved by an incorporation of carbon additives.In the study,we develop a novel Ndoped TiO2 mesoporous nanostructure via the addition of carbon quantum dots(CQDs)solution following a scalable hydrothermal process.The as-made TiO2 product shows well-defined morphology,high conductivity,large surface area,and abundant mesopores.When evaluated as anodes for sodiumion batteries,the CQDs@TiO2 product annealed at 500℃exhibits a superior sodium storage capability.It delivers a high reversible capacity of 168.8 mAh/g at 100 mA/g over 500 cycles and long cycling stability.The remarkable performance of CQDs@TiO2 mainly arises from the large surface area and mesoporous architecture constructed by ultrathin TiO2 nanosheets,as well as the full coope ration between CQDs and TiO2. 展开更多
关键词 TiO2 Mesoporous nanostructure Carbon quantum dots Anode materials Sodium-ion batteries
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Structural Phase Transition in Nanostructured TiO_2 认领 引用 被引量：2
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作者 Xisheng YE Jian SHA and Zhengkuan JIAOZifei PENG and Lide ZHANG 《Journal of Materials Science & Technology》 SCIE EI CAS 1997年第4期359-360,共2页
Using DTA (difFerential thermal analysis) measurement on nanostructured TiO2, we find two endothermic peaks on the DTA curve. From XRD (X-ray diffraction) analysis of the original nanostructured TiO2 and its heat-trea... Using DTA (difFerential thermal analysis) measurement on nanostructured TiO2, we find two endothermic peaks on the DTA curve. From XRD (X-ray diffraction) analysis of the original nanostructured TiO2 and its heat-treated samples, we obtain the following results: the first endothermic peak corresponds to the desorption of physical or chemical absorption, the second one is related to the structural phase transition from brookite to anatase then to rutile, and this structural phase transition is beneficial to the grain growth of nanocrystal 展开更多
关键词 TiO Structural Phase Transition in Nanostructured TiO2
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Effect of H-type Aggregation on the Photoelectric Conversion of Tetrasulfonated Phthalocyanine Adsorbed on Nanostructured TiO_2 Electrode 认领 引用
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作者 邓慧华 方靖淮 +3 位作者 顾建华 陆祖宏 毛海舫 许慧君 《Journal of Southeast University(English Edition)》 CAS 1997年第1期82-87,共6页
Tetrasulfonated Zn,Co,Ga,In,TiO and metal free phthalocyanine (MTsPc) mainly exist as dimers on the nanostructured TiO 2 electrode and mostly exist as monomers in dimethyl sulfoxide. The photocurrent action spectra of... Tetrasulfonated Zn,Co,Ga,In,TiO and metal free phthalocyanine (MTsPc) mainly exist as dimers on the nanostructured TiO 2 electrode and mostly exist as monomers in dimethyl sulfoxide. The photocurrent action spectra of the liquid junction based on the MTsPc/TiO 2 nanostructured electrode show that only the absorbance of the MTsPc monomer contributes to a photocurrent while that of the MTsPc face to face dimer does not generate a photocurrent. 展开更多
关键词 H type aggregation dimer tetrasulfonated phthalocyanine photoelectric conversion the nanostructured TiO 2 electrode
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Review: Nanostructured TiO_2 for Enhanced Photocatalytic Property by Glancing Angle Deposition Method 认领 引用
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作者 Shuang Shuang Zheng Xie Zhengjun Zhang 《Journal of Harbin Institute of Technology(New Series)》 CAS 2017年第5期1-11,共11页
The glancing angle deposition( GLAD) method is a kind of physical vapor deposition and many kinds of self-standing nanostructured materials can be prepared. Here we report GLAD method to form selfstanding TiO_2 nanost... The glancing angle deposition( GLAD) method is a kind of physical vapor deposition and many kinds of self-standing nanostructured materials can be prepared. Here we report GLAD method to form selfstanding TiO_2 nanostructures on specific substrates,which makes photocatalysts easier to recycle. And smart designs of doping,decorating band gap matched materials can also make traditional photocatalysts take use of more visible light. In this review,we present some previous work fabricating nanostructured TiO_2 composites for enhanced photocatalytic performance by these methods. 展开更多
关键词 glancing angle deposition TiO2 photocatalytic nanostructure
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Fabrication and Photocatalysis of TiO2 Flower-like Nanostructures 认领 引用 被引量：3
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作者 王延宗 洪勋 +1 位作者 王冠中 王晓平 《Chinese Journal of Chemical Physics》 SCIE EI CAS 北大核心 2006年第6期559-562,共4页
TiO2 nanostructures were fabricated by a reaction of Ti foils in H2O2 solution at mild temperature, Porous TiO2 nanostructurcs, well adhered to Ti foil surfaces, were formed at 80 ℃ in 10 rain, and then flower- like ... TiO2 nanostructures were fabricated by a reaction of Ti foils in H2O2 solution at mild temperature, Porous TiO2 nanostructurcs, well adhered to Ti foil surfaces, were formed at 80 ℃ in 10 rain, and then flower- like and rod nanostructures formed in succession after a longer reaction time. Samples prepared at 80 ℃ for 4 h arc amorphous, and anatase-dominated crystal phase emerged in the sample prepared for as long as 10 h. Almost pure anatase phase were obtained in TiO2 nanostructures by annealing the samples at a temperature of 300 ℃. Photoeatalysis of the TiO2 nanostructures was characterized by the degradation of RhB dye molecules in an aqueous solution exposed to ultraviolet light. Results show a 7 cm^2 annealed TiO2 flower-like nanostrueture having the degradation rate of RhB as fast as 29.8 times that of the dye solution exposed to ultraviolet light alone. 展开更多
关键词 TiO2 nanostructure Photodegradation RhB solution
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Synthesis of Different TiO2 Nanostructures and Their Physical Properties 认领 引用
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作者 T.Hoseinzadeh Z.Ghorannevis +2 位作者 M.Ghoranneviss M.K.Salem A.H.Sari 《Chinese Physics Letters》 SCIE EI CAS CSCD 2017年第11期53-56,共4页
Titanium dioxide （TiO2） nanosheet, nanorod and nanotubes are synthesized using chemical vapor deposition （CVD） and anodizing processes. TiO2 nanosheets are grown on Ti foil which is coated with Au catalyst in CVD,... Titanium dioxide （TiO2） nanosheet, nanorod and nanotubes are synthesized using chemical vapor deposition （CVD） and anodizing processes. TiO2 nanosheets are grown on Ti foil which is coated with Au catalyst in CVD, TiO2 nanorods are synthesized on treated Ti foil with HCl by CVD, and TiO2 nanotubes are prepared by the three-step anodization method. Scanning electron microscopy shows the final TiO2 structures prepared using three processes with three different morphologies of nanosheet, nanorod and nanotube. X-ray diffraction verifies the presence of TiO2. TiO2 sheets and rods are crystalized in rutile phase, and TiO2 tubes after annealing turn into the anatase crystal phase. The optical investigations carried out by diffuse reflection spectroscopy reveal that the morphology of TiO2 nanostructures influencing their optical response and band gap energy of TiO2 is changed for different TiO2 nanostructures. 展开更多
关键词 XRD SEM TiO Synthesis of Different TiO2 Nanostructures and Their Physical Properties
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La掺杂SiO_2/TiO_2纳米粉体的制备及其光催化性能 认领 引用 被引量：18
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作者 李艳廷 孙秀果 +3 位作者 王育华 司华艳 杨民力 彭政 《稀有金属》 EI CAS CSCD 北大核心 2014年第3期392-397,共6页
采用并流中和法制备了La掺杂的SiO2包覆TiO2纳米粒子,利用X射线衍射(XRD),傅立叶交换红外光谱(FT-IR),透射电镜(TEM)及紫外可见光吸收(UV-Vis)光谱对掺杂改性前后样品进行表征。以紫外光照降解甲基橙为测试体系,研究了La掺杂量及煅烧温... 采用并流中和法制备了La掺杂的SiO2包覆TiO2纳米粒子,利用X射线衍射(XRD),傅立叶交换红外光谱(FT-IR),透射电镜(TEM)及紫外可见光吸收(UV-Vis)光谱对掺杂改性前后样品进行表征。以紫外光照降解甲基橙为测试体系,研究了La掺杂量及煅烧温度对SiO2/TiO2光催化性能的影响,并对其作用机制做了初步的探讨。FT-IR表明在包覆层和纳米TiO2颗粒之间的界面上形成了Ti-O-Si和Ti-OLa键,从而抑制了金红石相的形成,提高了热稳定性,和XRD分析结果一致,掺杂了La的SiO2/TiO2在800℃时金红石相的含量仍然比较低,和120℃时的含量相当;TEM照片显示改性后的TiO2团聚减小,粒度均匀。UV-Vis光谱分析显示La掺杂SiO2/TiO2的光响应范围拓宽至可见光区,其中光吸收红移最大的样品为3.0%La掺杂量的SiO2/TiO2,带隙能(Eg)由原来的2.98 eV降为为2.41 eV。光催化性能实验结果显示当La的摩尔掺杂量为3.0%时,其光催化活性最好,光照20 min,与未掺杂改性的TiO2相比甲基橙的光降解率提高了55.1%;另外,未掺杂TiO2煅烧温度对光催化影响显著,当温度由120℃增加为800℃时,光照25 min的降解率就由69%降为10.7%,而掺La的SiO2/TiO2煅烧温度对其光催化性能影响不大。 展开更多
关键词 TiO2 La—SiO2 TiO2 光催化降解 稀土
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磁性纳米TiO_2/SiO_2/Fe_3O_4光催化剂的制备及表征 认领 引用 被引量：43
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作者 廖振华 陈建军 +2 位作者 姚可夫 赵方辉 李荣先 《无机材料学报》 SCIE EI CAS 北大核心 2004年第4期749-754,共6页
以纳米Fe3O4磁粉为核心,采用溶胶-凝胶法制备了TiO2/SiO2/Fe3O4复合光催化剂。用XRD、TEM及元素分析对其结构和表面形貌进行了表征。以具有偶氮染料结构的甲基橙水溶液为目标反应物,评价其光催化活性。结果表明,所制TiO2/SiO2/Fe3O4样... 以纳米Fe3O4磁粉为核心,采用溶胶-凝胶法制备了TiO2/SiO2/Fe3O4复合光催化剂。用XRD、TEM及元素分析对其结构和表面形貌进行了表征。以具有偶氮染料结构的甲基橙水溶液为目标反应物,评价其光催化活性。结果表明,所制TiO2/SiO2/Fe3O4样品为双层包覆型结构,SiO2为中间层,最外层是锐钛矿型的TiO2。该复合光催化剂对甲基橙溶液有较高的光催化活性,并具有可利用其磁性回收重用的特点,应用前景广泛。 展开更多
关键词 TiO2/SiO2/Fe3O4 包覆 磁性 光催化
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纳米TiO_2/SiO_2复合食品抗菌材料 认领 引用 被引量：23
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作者 杨毅 邓国栋 +2 位作者 尹强 李凤生 付廷明 《精细化工》 EI CAS 北大核心 2001年第12期703-706,共4页
以水玻璃和Ti(SO4) 2 为原料 ,制备出了多孔的纳米TiO2 /SiO2 复合粒子 ,在后处理过程中 ,利用无机包覆剂溶解度随温度的变化 ,在复合粒子表面包覆了一层无机结晶膜 ,经热处理除去包覆剂后 ,得到了以单分散纳米复合粒子组成的复合微粉... 以水玻璃和Ti(SO4) 2 为原料 ,制备出了多孔的纳米TiO2 /SiO2 复合粒子 ,在后处理过程中 ,利用无机包覆剂溶解度随温度的变化 ,在复合粒子表面包覆了一层无机结晶膜 ,经热处理除去包覆剂后 ,得到了以单分散纳米复合粒子组成的复合微粉。对复合微粉进行比表面和孔容测试 ,并运用XRD和TEM进行了表征 ,发现TiO2 以 12 .6nm的纳米晶粒的形式被多孔的SiO2 包覆 ,所形成的复合粒子则约为 2 0nm。为了了解复合微粒的灭菌效果 ,运用纳米TiO2 和复合粉末对 4种保健食品进行对照灭菌实验 ,两个月以后 ,测得含复合微粒的样品中的菌落总数为 5 0～12 0个 /g ,是相应保健食品企业标准许可菌落数的 0 .2 5 %～ 0 .7% ,为相应空白样和纳米TiO2 粉样品菌落数的 0 .5 2 %～ 0 .97%和 3 3 .3 %～ 83 .3 %。 展开更多
关键词 纳米材料 二氧化钛 二氧化硅 抗菌材料 食品
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多孔SiO_2与TiO_2复合纳米材料的制备及光催化性能 认领 引用 被引量：19
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作者 康传红 郭桐 +3 位作者 井立强 崔虎成 周佳 付宏刚 《无机材料学报》 SCIE EI CAS 北大核心 2009年第2期229-233,共5页
在溶胶-水热法所合成的锐钛矿相TiO2纳米晶基础上,利用模板剂调制的SiO2溶胶进一步合成了多孔SiO2与TiO2复合纳米粒子,重点研究了复合SiO2对纳米锐钛矿相TiO2热稳定性及光催化活性的影响.结果表明,复合SiO2提高了纳米锐钛矿相TiO2的热... 在溶胶-水热法所合成的锐钛矿相TiO2纳米晶基础上,利用模板剂调制的SiO2溶胶进一步合成了多孔SiO2与TiO2复合纳米粒子,重点研究了复合SiO2对纳米锐钛矿相TiO2热稳定性及光催化活性的影响.结果表明,复合SiO2提高了纳米锐钛矿相TiO2的热稳定性,经过900℃热处理后的TiO2仍然具有以锐钛矿相为主的相组成.在光催化降解罗丹明B实验过程中,经过高温热处理的复合纳米材料表现出优于Degussa P25 TiO2的活性,这主要与其锐钛矿相结晶度提高和具有较大比表面积等有关. 展开更多
关键词 TiO2 多孔SiO2 复合纳米材料 光催化
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SiO_2-TiO_2/聚四氟乙烯复合材料的制备及热膨胀性能 认领 引用 被引量：29
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作者 闫翔宇 袁颖 +2 位作者 张树人 吴开拓 崔毓仁 《复合材料学报》 EI CAS CSCD 北大核心 2013年第6期108-113,共6页
为了使微波基板材料与Cu金属衬底的热膨胀性能匹配，对陶瓷/聚四氟乙烯（PTFE）微波复合基板材料的热膨胀性能进行了研究。采用湿法工艺制备了以SiO2和TiO2为填料的SiO2-TiO2/PTFE复合材料，研究了复合材料密度、填料粒度和填料体积分数... 为了使微波基板材料与Cu金属衬底的热膨胀性能匹配，对陶瓷/聚四氟乙烯（PTFE）微波复合基板材料的热膨胀性能进行了研究。采用湿法工艺制备了以SiO2和TiO2为填料的SiO2-TiO2/PTFE复合材料，研究了复合材料密度、填料粒度和填料体积分数对SiO2-TiO2/PTFE复合材料热膨胀性能的影响。结果表明，当SiO2的体积分数由0增至40%（TiO2 ：34%~26%）时，SiO2-TiO2/PTFE复合材料的线膨胀系数（CTE）由50.13×10-6 K-1减小至10.03×10-6K-1。陶瓷粉体粒径和复合材料密度减小会导致CTE减小。通过ROM、Turner和Kerner模型计算CTE发现，ROM和Kerner模型与实验数据较相符，而实验值与Turner模型预测值之间的差异随PTFE含量的升高而逐渐增大。 展开更多
关键词 复合材料 聚四氟乙烯 TiO2 SiO2 线膨胀系数
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SiO2/TiO2催化剂的制备及其光催化性能 认领 引用 被引量：25
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作者 姜东 徐耀 +2 位作者 侯博 吴东 孙予罕 《无机材料学报》 SCIE EI CAS 北大核心 2008年第5期1080-1084,共5页
利用钛酸四丁酯、正硅酸乙酯、乙酸和水为原料,通过溶剂热方法制备得到SiO_2/TiO_2催化剂.产物经XRD、Raman、TEM、BET、FT-IR和XPS表征,结果表明:所制备的SiO_2/TiO_2催化剂为比表面积大、结晶度高的锐钛矿TiO_2,SiO_2与TiO_2之间通过S... 利用钛酸四丁酯、正硅酸乙酯、乙酸和水为原料,通过溶剂热方法制备得到SiO_2/TiO_2催化剂.产物经XRD、Raman、TEM、BET、FT-IR和XPS表征,结果表明:所制备的SiO_2/TiO_2催化剂为比表面积大、结晶度高的锐钛矿TiO_2,SiO_2与TiO_2之间通过Si-O-Ti键结合.另外,以亚甲基蓝降解为探针反应,考察了SiO_2/TiO_2催化剂在紫外光照射下的光催化性能.结果表明;SiO_2/TiO_2催化剂具有比纯TiO_2更优越的光催化性能,65min可以将亚甲基蓝(MB)彻底降解. 展开更多
关键词 溶剂热 SiO2/TiO2 光催化性能
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Fe3+/TiO_2/SiO_2复合纳米微粒的合成及光催化降解NO_2^- 认领 引用 被引量：53
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作者 金华峰 李文戈 +1 位作者 向纪明 唐吉玉 《应用化学》 CAS 北大核心 2001年第8期636-639,共4页
采用溶胶 -凝胶法制备了 Ti O2 / Si O2 和不同浓度 Fe3+掺杂的 Fe3+ / Ti O2 / Si O2 复合纳米粉末 ,并利用XRD、BET、UV-vis等手段研究了 Ti O2 / Si O2 及掺铁形成的 Fe3+ / Ti O2 / Si O2 复合微粒的表面结构形态变化 ,以及对污染物... 采用溶胶 -凝胶法制备了 Ti O2 / Si O2 和不同浓度 Fe3+掺杂的 Fe3+ / Ti O2 / Si O2 复合纳米粉末 ,并利用XRD、BET、UV-vis等手段研究了 Ti O2 / Si O2 及掺铁形成的 Fe3+ / Ti O2 / Si O2 复合微粒的表面结构形态变化 ,以及对污染物 NO- 2 光催化降解的影响 .结果表明 ,Fe3+ / Ti O2 / Si O2 (ω( Fe3+ ) =1 .5 % ,m( Ti)∶ m( Si) =2∶ 1 )具有最佳活性 ,样品呈晶化度较低的锐钛矿结构 .Fe3+ 掺杂导致晶粒的增大 ,稳定性降低 ,大大提高了半导体的光催化活性 ,有利于对低浓度 NO- 2 展开更多
关键词 Fe^3+/TiO2/SiO2 TiO2/SiO2 复合微粒 光降解 NO2- 纳米粉末 催化活性 环境污染物 二氧化钛 二氧化硅 铁掺杂 亚硝酸根
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静电纺丝技术制备TiO_2/SiO_2复合中空纳米纤维与表征 认领 引用 被引量：24
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作者 张双虎 董相廷 +1 位作者 徐淑芝 王进贤 《复合材料学报》 EI CAS 北大核心 2008年第3期138-143,共6页
用静电纺丝技术成功制备出复合中空TiO2/SiO2纳米纤维。用动态热分析仪、红外光谱仪、X射线衍射仪、扫描电镜、透射电镜和X射线能谱仪等分析技术对样品进行了表征。分析结果表明,得到的产物为复合中空TiO2/SiO2纳米纤维,以非晶SiO2为外... 用静电纺丝技术成功制备出复合中空TiO2/SiO2纳米纤维。用动态热分析仪、红外光谱仪、X射线衍射仪、扫描电镜、透射电镜和X射线能谱仪等分析技术对样品进行了表征。分析结果表明,得到的产物为复合中空TiO2/SiO2纳米纤维,以非晶SiO2为外壳,内壁由粒径为50 nm的晶态TiO2粒子组成,复合中空纳米纤维平均直径2μm,长度>100μm。讨论了复合中空纳米纤维的形成机制,复合纤维在烧结过程中,芯层TiO2纳米粒子向外表面扩散,与壳层SiO2粒子形成新化学键,得到复合中空纳米纤维。 展开更多
关键词 静电纺丝 复合中空纳米纤维 SiO2 TiO2
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纳米TiO_2表面包覆致密SiO_2膜的试验研究 认领 引用 被引量：28
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作者 邹建 高家诚 +2 位作者 王勇 李易东 文敏 《材料科学与工程学报》 CAS 北大核心 2004年第1期71-73,共3页
用液相沉积法对纳米二氧化钛进行了表面改性。用XRD、FT IR分析手段对其进行了表面结构表征 ,采用X衍射荧光光谱仪 (XRF)测定SiO2 包覆量随陈化时间的变化。通过煅烧失重法比较改性前后样品的失重 ,并用动态法测量样品与水的湿润角。结... 用液相沉积法对纳米二氧化钛进行了表面改性。用XRD、FT IR分析手段对其进行了表面结构表征 ,采用X衍射荧光光谱仪 (XRF)测定SiO2 包覆量随陈化时间的变化。通过煅烧失重法比较改性前后样品的失重 ,并用动态法测量样品与水的湿润角。结果表明在TiO2 表面存在致密非晶态的硅氧化合物膜 ,纳米TiO2 与水的湿润角增大 ,并且充分分散后在水中的稳定性却得到了很大提高。 展开更多
关键词 纳米TiO2 液相沉积法 SiO2 表面改性 动态法 湿润角 稳定性
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硼砂协同纳米SiO2、TiO2交联改性PVA基膜材料及其透湿和抑菌性分析 认领 引用 被引量：13
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作者 刘瑶 章建浩 +3 位作者 龙门 李璨 刘桂超 梅玉 《食品科学》 CAS CSCD 北大核心 2014年第14期17-23,共7页
为提高聚乙烯醇(polyvinyl alcohol,PVA)基涂膜保鲜材料的阻湿性能,以水蒸气透过系数(water vapor permeability,WVP)为响应值,采用响应面法研究硼砂协同纳米SiO2、TiO2交联改性PVA基膜材料对WVP的影响。结果表明:硼砂协同纳米SiO2、纳... 为提高聚乙烯醇(polyvinyl alcohol,PVA)基涂膜保鲜材料的阻湿性能,以水蒸气透过系数(water vapor permeability,WVP)为响应值,采用响应面法研究硼砂协同纳米SiO2、TiO2交联改性PVA基膜材料对WVP的影响。结果表明:硼砂协同纳米SiO2、纳米TiO2交联改性PVA能显著降低PVA基膜材料的WVP(P<0.05),硼砂与纳米SiO2及TiO2添加量对WVP有显著的交互作用(P<0.05);以膜材料WVP最低为响应值,优化成膜工艺条件为纳米SiO2添加量0.033 g/100 mL、纳米TiO2添加量0.042 g/100 mL、硼砂添加量0.032 g/100 mL,此条件下WVP为(9.729±0.074)mg/(m·d·kPa),比PVA单膜降低了44.68%。优化的PVA基复合膜抑菌性提高,可以使大肠杆菌菌落总数降低1个数量级。 展开更多
关键词 纳米SiO2 纳米TiO2 硼砂 聚乙烯醇 WVP 抑菌
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Preparation and photocatalytic activity of Cu2+-doped TiO2/SiO2 认领 引用 被引量：9
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作者 Ru-fen Chen Cui-xuan Zhang +1 位作者 Juan Deng Guo-qiang Song 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS 2009年第2期220-225,共6页
Cu^2+-doped nanostructured TiO2-coated SiO2(TiO2/SiO2)particles were prepared by the layer-by-layer assembly technique and their photocatalytic property was studied.TiO2 colloids were synthesized by the sol-gel method... Cu^2+-doped nanostructured TiO2-coated SiO2(TiO2/SiO2)particles were prepared by the layer-by-layer assembly technique and their photocatalytic property was studied.TiO2 colloids were synthesized by the sol-gel method using TiOSO4 as a precursor.The experimental results showed that TiO2 nanopowders on the surface of SiO2 particles were well distributed and compact.The amount of TiO2 increased with the increase in coating layers.The shell structure appeared to be composed of anatase titania nanocrystals at 550℃.The 2-layer coated TiO2 particles on the surface showed a higher degradation rate compared with all the different-layer samples.The photocatalytic activity of Cu^2+-doped TiO2/SiO2 was higher than that ofundoped TiO2/SiO2.The optimum dopant content was about 0.10wt%. 展开更多
关键词 nanostructured TiO2 SiO2 particles layer-byqayer assembly Cu^2+-doped photocatalytic activity
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Preparation of TiO_2/SiO_2 Aerogels by Non-supercritical Drying Method and Their Photocatalytic Activity for Degradation of Pyridine 认领 引用 被引量：11
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作者 甘礼华 王玉栋 +2 位作者 郝志显 徐子颉 陈龙武 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2005年第6期758-763,共6页
TiO2/SiO2 aerogels with different molar ratio of SiO2/TiO2 were prepared via non-supercritical method using tetrabutyl titanate and silica sols as raw materials. The samples were characterized by TEM, SEM, BET, IR, XR... TiO2/SiO2 aerogels with different molar ratio of SiO2/TiO2 were prepared via non-supercritical method using tetrabutyl titanate and silica sols as raw materials. The samples were characterized by TEM, SEM, BET, IR, XRD and so on. The results indicate that the BET surface area of TiO2/SiO2 aerogels calcined at 550℃ which consisted of anatase structure of TiO2 with narrow distribution pores of 5-25 nm is as high as 357.89 m2·g-1. For the photocatalytic degradation of pyridine, the catalytic activities of TiO2/SiO2 aerogels are much higher than that of TiO2 powder. The photocatalytic activity of TiO2/SiO2 aerogels calcined at 800℃ is the optimum. The higher the content of SiO2, the higher the photocatalytic activity of TiO2/SiO2 aerogels. The cost for preparation of the aerogels is greatly reduced by using non-supercritical drying method, and the aerogels are hopefully applied in the treatment of industrial waste water such as coking effluent treatment. 展开更多
关键词 TiO2/SiO2 aerogels photocatalysis pyridine degradation
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