期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到692篇文章
< 1 2 … 35 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Cu/TiO_2/SiO_2纳米复合薄膜光催化降解氨气性能的研究 认领 引用 被引量：4
1
作者 倪小敏 张小俊 +3 位作者 金翔 蔡昕 肖修昆 廖光煊 《环境科学与技术》 CAS 北大核心 2009年第11期44-47,71,共4页
采用溶胶-凝胶结合γ-射线辐射法制备了Cu/TiO2/SiO2纳米介孔复合薄膜。X-射线衍射(XRD),透射电子显微镜(TEM),紫外-可见光谱(UV-vis)及X-射线光电子能谱(XPS)表征显示单质金属铜与锐钛矿型TiO2纳米粒子较均匀地分布在非晶SiO2介孔基体... 采用溶胶-凝胶结合γ-射线辐射法制备了Cu/TiO2/SiO2纳米介孔复合薄膜。X-射线衍射(XRD),透射电子显微镜(TEM),紫外-可见光谱(UV-vis)及X-射线光电子能谱(XPS)表征显示单质金属铜与锐钛矿型TiO2纳米粒子较均匀地分布在非晶SiO2介孔基体的孔洞之中。光催化降解氨气的实验结果表明该三元复合薄膜具有良好的光催化性能,与未掺杂铜的TiO2/SiO2二元复合薄膜相比,铜纳米粒子的掺入可将其光催化性能提高18%以上。 展开更多
关键词 Cu/TiO2/SiO2 复合薄膜 氨气降解 光催化
暂未订购 下载PDF
Effect of copper loading on texture,structure and catalytic performance of Cu/SiO_2 catalyst for hydrogenation of dimethyl oxalate to ethylene glycol 认领 引用 被引量：15
2
作者 Bo Zhang Shengguo Hui +3 位作者 Suhua Zhang Yang Ji Wei Li Dingye Fang 《Journal of Natural Gas Chemistry》 CSCD 2012年第5期563-570,共8页
Cu/SiO2 catalysts prepared by a convenient and efficient method using the urea hydrolysis deposition-precipitation （UHDP） technique have been proposed focusing on the effect of copper loading.The texture,structure a... Cu/SiO2 catalysts prepared by a convenient and efficient method using the urea hydrolysis deposition-precipitation （UHDP） technique have been proposed focusing on the effect of copper loading.The texture,structure and composition are systematically characterized by ICP,FTIR,N 2-physisorption,N2O chemisorption,TPR,XRD and XPS.The formation of copper phyllosilicate is observed in Cu/SiO2 catalyst by adopting UHDP method,and the amount of copper phyllosilicate is related to copper loading.It is found the structure properties and catalytic performance is profoundly affected by the amount of copper phyllosilicate.The excellent catalytic activity is attributed to the synergetic effect between Cu0 and Cu ＋.DMO conversion and EG selectivity are determined by the amount of Cu0 and Cu＋,respectively.The proper copper loading （30 wt%） provides with the highest ratio of Cu ＋ /Cu0,giving rise to the highest EG yield of 95% under the reaction conditions of p=2.0 MPa,T=473 K,H2/DMO=80 and LHSV=1.0h-1. 展开更多
关键词 Cu/SiO2 copper loading dimethyl oxalate ethylene glycol copper phyllosilicate
暂未订购 下载PDF
Preparation and photocatalytic activity of Cu2+-doped TiO2/SiO2 认领 引用 被引量：9
3
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
暂未订购 下载PDF
Effects of ethanol on the in situ synthesized Cu/SiO2catalyst:Texture,structure,and the catalytic performance in hydrogenation dimethyl oxalate to ethylene glycol 认领 引用 被引量：6
4
作者 Shu Rong Wang Ling Jun Zhu +2 位作者 Ying Ying Zhu Xiao Lan Ge Xin Bao Li 《Chinese Chemical Letters》 SCIE CAS CSCD 2011年第3期362-365,共4页
The Cu/SiO2catalysts were in situ synthesized by the hydrolysis of tetraethyl orthosilicate(TEOS)in one phase solution using ethanol as co-solvent or TEOS/H_2O two phases solution,followed by the precipitation of c... The Cu/SiO2catalysts were in situ synthesized by the hydrolysis of tetraethyl orthosilicate(TEOS)in one phase solution using ethanol as co-solvent or TEOS/H_2O two phases solution,followed by the precipitation of copper on SiO2by ammonia evaporation.In the hydrogenation of dimethyl oxalate,the catalyst prepared by one phase hydrolysis exhibited higher activity and ethylene glycol(EG)selectivity at lower temperature than that of two phases due to its larger BET surface area and multimodal pore distribution.At 488-503 K,the catalyst prepared in one phase solution with water/ethanol(W/E)volume ratio of 3:1 exhibited 90-95%EG selectivity,while catalyst prepared by two phase hydrolysis reached 90%EG selectivity only at 498-503 K. 展开更多
关键词 Ethanol Cu/SiO2 TEOS Hydrogenation Dimethyl oxalate Ethylene glycol
暂未订购 下载PDF
An efficient and stable Cu/SiO_2 catalyst for the syntheses of ethylene glycol and methanol via chemoselective hydrogenation of ethylene carbonate 认领 引用 被引量：10
5
作者 Jiaju Liu Peng He +3 位作者 Liguo Wang Hui Liu Yan Cao Huiquan Li 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第8期1283-1293,共11页
The efficient synthesis of methanol and ethylene glycol via the chemoselective hydrogenation of ethylene carbonate（EC） is important for the sustainable utilization of CO_2 to produce commodity chemicals and fuels. I... The efficient synthesis of methanol and ethylene glycol via the chemoselective hydrogenation of ethylene carbonate（EC） is important for the sustainable utilization of CO_2 to produce commodity chemicals and fuels. In this work, a series of β-cyclodextrin-modified Cu/SiO_2 catalysts were prepared by ammonia evaporation method for the selective hydrogenation of EC to co-produce methanol and ethylene glycol. The structure and physicochemical properties of the catalysts were characterized in detail by N_2 physisorption, XRD, N_2O titration, H_2-TPR, TEM, and XPS/XAES. Compared with the unmodified 25 Cu/SiO_2 catalyst, the involvement of β-cyclodextrin in 5β-25 Cu/SiO_2 could remarkably increase the catalytic activity—excellent activity of 1178 mgEC g_（cat）^（–1） h^（–1） with 98.8%ethylene glycol selectivity, and 71.6% methanol selectivity could be achieved at 453 K. The remarkably improved recyclability was primarily attributed to the remaining proportion of Cu~＋/（Cu^0＋Cu~＋）. Furthermore, the DFT calculation results demonstrated that metallic Cu^0 dissociated adsorbed H_2, while Cu~＋ activated the carbonyl group of EC and stabilized the intermediates. This study is a facile and efficient method to prepare highly dispersed Cu catalysts—this is also an effective and stable heterogeneous catalyst system for the sustainable synthesis of ethylene glycol and methanol via indirect chemical utilization of CO_2. 展开更多
关键词 Ethylene carbonate Hydrogenation β-Cyclodextrin Cu/SiO2 Methanol Ethylene glycol
暂未订购 下载PDF
Zn、Cu共掺杂TiO_2∶SiO_2薄膜材料的光学性能研究 认领 引用 被引量：4
6
作者 伞靖 魏长平 +2 位作者 孙双 何瑞英 彭春佳 《发光学报》 EI CAS CSCD 北大核心 2017年第1期27-31,共5页
用溶胶-凝胶法制得Zn、Cu共掺杂的TiO_2∶SiO_2凝胶,旋转法于玻璃基底涂膜,制得Zn、Cu共掺杂的TiO_2∶SiO_2薄膜,探讨了煅烧温度、煅烧时间及掺杂比例对其结构、形貌和性能的影响。采用XRD、FESEM、FTIR等测试技术对薄膜进行表征,并考... 用溶胶-凝胶法制得Zn、Cu共掺杂的TiO_2∶SiO_2凝胶,旋转法于玻璃基底涂膜,制得Zn、Cu共掺杂的TiO_2∶SiO_2薄膜,探讨了煅烧温度、煅烧时间及掺杂比例对其结构、形貌和性能的影响。采用XRD、FESEM、FTIR等测试技术对薄膜进行表征,并考察了其对甲基橙的光催化降解性能。XRD测试结果显示:薄膜样品的晶型为锐钛矿型,结晶良好。SEM谱图显示:薄膜微粒粒径小,分布均匀,表面平整、致密且无明显裂痕;紫外-可见光谱(UV-Vis)表明:Zn、Cu共掺杂的TiO_2∶SiO_2薄膜在紫外区和可见光区的吸光度明显增加,提高了对光的利用率;光催化性能测试表明:与纯相TiO_2对比,Zn、Cu共掺杂的TiO_2∶SiO_2薄膜对甲基橙的光催化降解率有较大提高,在600℃下焙烧2h的掺杂的量比为n(Ti)∶n(Si)∶n(Zn)∶n(Cu)=3∶2∶1.5∶4的薄膜样品光催化降解率最高。 展开更多
关键词 溶胶-凝胶 TiO2∶SiO2 共掺杂 光催化 薄膜
暂未订购 下载PDF
Zr(Ⅳ) surface sites determine CH3OH formation rate on Cu/ZrO2/SiO2-CO2 hydrogenation catalysts 认领 引用 被引量：3
7
作者 Erwin Lam Kim Larmier +3 位作者 Shohei Tada Patrick Wolf Olga V. Safonova Christophe Copéret 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第11期1741-1748,共8页
Cu/ZrO2/SiO2 are efficient catalysts for the selective hydrogenation of CO2 to CH3OH. In order to understand the role of ZrO2 in these mixed-oxides based catalysts, in situ X-ray absorption spectroscopy has been carri... Cu/ZrO2/SiO2 are efficient catalysts for the selective hydrogenation of CO2 to CH3OH. In order to understand the role of ZrO2 in these mixed-oxides based catalysts, in situ X-ray absorption spectroscopy has been carried out on the Cu and Zr K-edge. Under reaction conditions, Cu remains metallic, while Zr is present in three types of coordination environment associated with 1) bulk ZrO2, 2) coordinatively saturated and 3) unsaturated Zr(Ⅳ) surface sites. The amount of coordinatively unsaturated Zr surface sites can be quantified by linear combination fit of reference X-Ray absorption near edge structure (XANES) spectra and its amount correlates with CH3OH formation rates, thus indicating the importance of Zr(Ⅳ) Lewis acid surface sites in driving the selectivity toward CH3OH. This finding is consistent with the proposed mechanism, where CO2 is hydrogenated at the interface between the Cu nanoparticles that split H2 and Zr(Ⅳ) surface sites that stabilizes reaction intermediates. 展开更多
关键词 CO2 hydrogenation ZrO2/SiO2 supported Cu nanoparticles Lewis acidic surface sites In situ X-ray absorption spectroscopy
暂未订购 下载PDF
Catalytic Performance and Texture of TEOS Based Cu/SiO2Catalysts for Hydrogenation of Dimethyl Oxalate to Ethylene Glycol 认领 引用 被引量：3
8
作者 WANG Shu-rong YIN Qian-qian LI Xin-bao 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2012年第1期119-123,共5页
Highly active and selective Cu/SiO2catalysts for hydrogenation of dimethyl oxalate(DMO)to ethylene glycol(EG)were successfully prepared by means of a convenient one-pot synthetic method with tetraethoxysi lane(TEOS... Highly active and selective Cu/SiO2catalysts for hydrogenation of dimethyl oxalate(DMO)to ethylene glycol(EG)were successfully prepared by means of a convenient one-pot synthetic method with tetraethoxysi lane(TEOS)as the source of silica.XRD,H2-TPR,SEM,TEM,XRF and N2 physisorption measurements were performed to characterize the texture and structure of Cu/SiO2catalysts with different copper loadings.The active components were highly dispersed on SiO2supports.Furthermore,the coexistence of CuO and Cu+contributed a lot to the excellent performance of Cu-TEOS catalysts.The DMO conversion reached 100%and the EG selectivity reached 95%at 498 K and 2 MPa with a high liquid hourly space velocity over the 27-Cu-TEOS catalyst with an actual cop per loading of 19.0%(mass fraction). 展开更多
关键词 Cu/SiO2 TEOS Hydrogenation Dimethyl oxalate Ethylene glycol
暂未订购 下载PDF
In situ IR study of dimethyl oxalate hydrogenation to ethylene glycol over Cu/SiO_2 catalyst 认领 引用 被引量：2
9
作者 Shengguo Hui Bo Zhang +1 位作者 Suhua Zhang Wei Li 《Journal of Natural Gas Chemistry》 CSCD 2012年第6期753-758,共6页
The mechanism of dimethyl oxalate hydrogenation to ethylene glycol over Cu/SiO2 catalyst was investigated by in situ Fourier transform infrared （FTIR） spectroscopy. It was found that dimethyl oxalate and methyl glyc... The mechanism of dimethyl oxalate hydrogenation to ethylene glycol over Cu/SiO2 catalyst was investigated by in situ Fourier transform infrared （FTIR） spectroscopy. It was found that dimethyl oxalate and methyl glycolate proceeded via dissociative adsorption on Cu/SiO2 catalyst, and four main intermediates, CH3OC（O）（O）C-M （1655 cm-1）, M-C（O）（O）C-M （1618 cm-1）, HOCH2（O）C--M （1682 cm-1） and CH3O-M （2924-2926 cm-1）, were identified during the reaction. It was concluded that dimethyl oxalate hydrogenation to ethylene glycol mainly proceeded along the route： dimethyl oxalate ／rightarrow CH3OC（O）（O）C-M → methyl glycolate →HOCH2（O）C-M → ethylene glycol. Finally a schematic reaction network was proposed. 展开更多
关键词 dimethyl oxalate ethylene glycol FTIR hydrogenation Cu/SiO2
暂未订购 下载PDF
Cu/TiO_2-SiO_2催化剂的制备及糠醛选择加氢活性研究 认领 引用 被引量：1
10
作者 宋华 宋腱森 李锋 《化学工业与工程技术》 2012年第2期55-58,共4页
采用溶胶凝胶-水热法制备Cu/TiO2-SiO2催化剂,并运用XRD、BET对催化剂进行表征,以糠醛选择加氢制糠醇反应为探针,考察载体组成及Cu含量对催化剂活性的影响。结果表明,载体中引入适量的TiO2能够抑制Cu晶粒的增长,改善Cu粒子在催化剂中的... 采用溶胶凝胶-水热法制备Cu/TiO2-SiO2催化剂,并运用XRD、BET对催化剂进行表征,以糠醛选择加氢制糠醇反应为探针,考察载体组成及Cu含量对催化剂活性的影响。结果表明,载体中引入适量的TiO2能够抑制Cu晶粒的增长,改善Cu粒子在催化剂中的分散性。载体中TiO2质量分数40%,Cu负载量(质量分数)20%时,制备的Cu/TiO2-SiO2催化剂具有较好的催化活性。 展开更多
关键词 溶胶凝胶-水热 Cu/TiO2-SiO2 糠醛 糠醇 选择加氢
暂未订购 下载PDF
Photocatalytic oxidation of Rhodamine B in a three-phase internal circulating fluidized bed with TiO_2/SiO_2 as photocatalyst 认领 引用
11
作者 尤宏 孙丽欣 +1 位作者 罗薇楠 刘婷 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2010年第5期651-656,共6页
A novel photoreactor of three-phase internal circulating fluidized bed was applied to the degradation of Rhodamine B with TiO2/SiO2 catalyst and TiO2 powder,respectively.The experimental results showed that the photoc... A novel photoreactor of three-phase internal circulating fluidized bed was applied to the degradation of Rhodamine B with TiO2/SiO2 catalyst and TiO2 powder,respectively.The experimental results showed that the photocatalytic activity of TiO2/SiO2 catalyst was much higher than that of TiO2 powder under the same condition,and the half life of Rhodamine B using TiO2/SiO2 was 9.5 min,much lower than 63 min when using TiO2 powder.Moreover,TiO2/SiO2 had a good adsorption capacity of Rhodamine B,which played an important role on degradation.In addition,it was found that the degradation kinetics of Rodamine B with TiO2/SiO2 catalyst did not follow the first order reaction.The degradation kinetics model in terms of the adsorption process of catalyst and the analytic solution of reactant degradation rate in liquid phase could be deduced,which consisted of two parts.The first part was due to the adsorption,while the second part was due to the photocatalysis.In the beginning of the reaction,the adsorption process was dominant.However,when the adsorption achieved a balance,the degradation of Rhodamine B in liquid phase and solid phase was mainly caused by photocatalysis and the degradation kinetics model conformed to the first order reaction. 展开更多
关键词 photocatalysis three-phase fluidized bed TiO2/SiO2 kinetics adsorption
暂未订购 下载PDF
In_2O_3-modified Cu/SiO_2 as an active and stable catalyst for the hydrogenation of methyl acetate to ethanol 认领 引用 被引量：11
12
作者 Yu Zhang Chenliang Ye +2 位作者 Cuili Guo Changna Gan Xinmeng Tong 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2018年第1期99-108,共10页
A series of indium oxide‐modified Cu/SiO2catalysts were synthesized and used to produce ethanol via methyl acetate hydrogenation.In‐Cu/SiO2catalyst containing1.0wt%In2O3exhibited the best catalytic activity and stab... A series of indium oxide‐modified Cu/SiO2catalysts were synthesized and used to produce ethanol via methyl acetate hydrogenation.In‐Cu/SiO2catalyst containing1.0wt%In2O3exhibited the best catalytic activity and stability.The physicochemical properties of the synthesized catalysts were investigated using several characterization methods and the results showed that introducing suitable indium to Cu/SiO2increased the copper dispersion,diminished the copper crystallite size,and enriched the surface Cu+concentration.Furthermore,the Cu/SiO2catalyst gradually deactivated during the stability test,which was mainly attributed to copper sintering and the valence change in surface copper species.In contrast,indium addition can inhibit the thermal transmigration and accumulation of copper nanoparticles to stabilize the catalyst.?2018,Dalian Institute of Chemical Physics,Chinese Academy of Sciences.Published by Elsevier B.V.All rights reserved. 展开更多
关键词 Methyl acetate Hydrogenation Indium Cu/SiO2 catalyst Ethanol
暂未订购 下载PDF
Cu-TiO2/SiO2制备及其光催化还原水中硝酸盐氮的研究 认领 引用 被引量：1
13
作者 叶龙 《广州化工》 CAS 2019年第14期54-56,共3页
采用溶胶凝胶法制备了Cu-TiO2/SiO2催化剂,用XPS、XRD、SEM和UV-Vis对催化剂进行表征与分析。以催化剂对水中硝酸盐氮的还原效果为评价标准,研究其催化性能。结果表明:本实验条件下,当Cu^2+、TiO2两者质量比是0.5%时所制备的催化剂光催... 采用溶胶凝胶法制备了Cu-TiO2/SiO2催化剂,用XPS、XRD、SEM和UV-Vis对催化剂进行表征与分析。以催化剂对水中硝酸盐氮的还原效果为评价标准,研究其催化性能。结果表明:本实验条件下,当Cu^2+、TiO2两者质量比是0.5%时所制备的催化剂光催化还原水中NO3-N效果最好,催化剂中的铜以CuO的状态存在,Cu掺杂不会严重影响催化剂中锐钛矿型TiO2晶型结构和粒径。 展开更多
关键词 溶胶凝胶法 Cu-TiO2/SiO2 光催化还原 硝酸盐氮
暂未订购 下载PDF
不同晶相TiO_2负载Cu_2O催化甲醛乙炔化反应 认领 引用 被引量：11
14
作者 王志鹏 牛珠珠 +4 位作者 班丽君 郝全爱 张鸿喜 李海涛 赵永祥 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2019年第2期334-341,共8页
分别以金红石相和锐钛矿相TiO_2为载体,采用液相还原-沉积法制备了Cu_2O/TiO_2催化剂.采用氮气物理吸附-脱附(N2-physisorption)实验、氢气程序升温还原(H2-TPR)、X射线衍射(XRD)、X射线光电子能谱(XPS)、CO红外光谱(CO-IR)及高分辨透... 分别以金红石相和锐钛矿相TiO_2为载体,采用液相还原-沉积法制备了Cu_2O/TiO_2催化剂.采用氮气物理吸附-脱附(N2-physisorption)实验、氢气程序升温还原(H2-TPR)、X射线衍射(XRD)、X射线光电子能谱(XPS)、CO红外光谱(CO-IR)及高分辨透射电子显微镜(HRTEM)等技术,研究了不同晶相TiO_2载体对Cu_2O/TiO_2结构及其催化甲醛乙炔化反应性能的影响.结果表明,以金红石相TiO_2为载体的催化剂炔化活性明显高于以锐钛矿相TiO_2为载体的催化剂,原因在于金红石相TiO_2主要暴露(110)晶面,其与铜物种的配位环境及较高的空位密度形成了更多的Cu—O—Ti结构物种,表现为Cu_2O与TiO_2之间强的相互作用.这导致Cu_2O高效转变为乙炔亚铜活性物种,并保持了较高的分散度与稳定性,抑制了过度还原物种金属Cu的生成,进而使催化剂表现出较高的催化性能. 展开更多
关键词 Cu2O/TiO2 晶相结构 甲醛乙炔化 1,4-丁炔二醇
暂未订购 下载PDF
掺杂Cu的TiO_2纳米粒子的制备、表征及其光催化活性 认领 引用 被引量：25
15
作者 辛柏福 井立强 +4 位作者 付宏刚 孙志华 任志宇 王百齐 蔡伟民 《高等学校化学学报》 SCIE EI CAS 北大核心 2004年第6期1076-1080,共5页
采用 Sol-gel法制备了纯的和掺杂不同量 Cu的 Ti O2 纳米粒子 ,并用 TG-DTA,XRD,XPS,UV-Vis和荧光光谱对样品进行了表征 ,考察焙烧温度和 Cu含量对 Ti O2 纳米粒子的性质及光催化活性的影响 ,初步探讨了 Cu的掺杂对 Ti O2 相变的作用机... 采用 Sol-gel法制备了纯的和掺杂不同量 Cu的 Ti O2 纳米粒子 ,并用 TG-DTA,XRD,XPS,UV-Vis和荧光光谱对样品进行了表征 ,考察焙烧温度和 Cu含量对 Ti O2 纳米粒子的性质及光催化活性的影响 ,初步探讨了 Cu的掺杂对 Ti O2 相变的作用机制及样品荧光光谱与光催化活性的关系 .结果表明 ,Cu2 + 的掺杂对 Ti O2 的相变有很大的促进作用 ,并使其光谱响应范围向可见光区拓展 .Cu的掺杂未引起新的荧光现象 ,但适量 Cu的掺杂能够降低 Ti O2 纳米粒子的荧光强度 .此外 ,在光催化降解苯酚的实验中 ,于 5 0 0℃处理的掺杂 Cu的 Ti O2 纳米粒子的光催化活性较高 ,与表征结果一致 .而掺杂不同量 Cu的 Ti O2 的光催化活性顺序与样品荧光光谱强度的顺序相反 ,即荧光光谱强度越低 ,其光催化活性越高 . 展开更多
关键词 TiO2 掺杂 Cu 荧光光谱 光催化
暂未订购 下载PDF
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
16
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
暂未订购 下载PDF
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
17
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
暂未订购 下载PDF
纳米TiO_2/SiO_2复合食品抗菌材料 认领 引用 被引量：23
18
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
暂未订购 下载PDF
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
19
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
暂未订购 下载PDF
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
20
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
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 35 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈