期刊文献+
共找到843篇文章
< 1 2 43 >
每页显示 20 50 100
Direct Synthesis of Bienzyme-like Carbide-derived Carbons via Mild Electrochemical Oxidation of Ti_(3)AlC_(2)MAX
1
作者 FANG Yan Feng DING Xiao Teng +6 位作者 XU Geng Fang GONG Shi Da NIU Yu Sheng YAO Zi Yu JIN Zhao Yong WANG Yao XU Yuan Hong 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2022年第3期215-224,共10页
Objective To develop effective alternatives to natural enzymes,it is crucial to develop nanozymes that are economical,resource efficient,and environmentally conscious.Carbon nanomaterials that have enzyme-like activit... Objective To develop effective alternatives to natural enzymes,it is crucial to develop nanozymes that are economical,resource efficient,and environmentally conscious.Carbon nanomaterials that have enzyme-like activities have been extensively developed as substitutes for traditional enzymes.Methods Carbide-derived carbons(CDCs)were directly synthesized via a one-step electrochemical method from a MAX precursor using an ammonium bifluoride electrolyte at ambient conditions.The CDCs were characterized by systematic techniques.Results CDCs showed bienzyme-like activities similar to that of peroxidase and superoxide dismutase.We systematically studied the dependence of CDC enzyme-like activity on different electrolytes and electrolysis times to confirm activity dependence on CDC content.Additionally,the synthesis mechanism and CDC applicability were elaborated and demonstrated,respectively.Conclusion The demonstrated synthesis strategy eliminates tedious intercalation and delamination centrifugation steps and avoids using high concentrations of HF,high temperatures,and halogen gases.This study paves the way for designing two-dimensional material-based nanocatalysts for nanoenzyme and other applications. 展开更多
关键词 Bienzyme-like ELECTROCHEMICAL carbide-derived carbons
下载PDF
Preparation of calcium carbonate particles coated with titanium dioxide 被引量:15
2
作者 Hai Lin Ying-bo Dong Le-yong Jiang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2009年第5期592-597,共6页
The preparation of a new mineral composite material, calcium carbonate particles coated with titanium dioxide, was studied. The mechanism of the preparation process was proposed. The new mineral composite material was... The preparation of a new mineral composite material, calcium carbonate particles coated with titanium dioxide, was studied. The mechanism of the preparation process was proposed. The new mineral composite material was made by the mechanoehemieal method under the optimum condition that the mass ratio of calcium carbonate particles to titanium dioxide was 6.5:3.5. The mass ratios of two different types of titanium dioxide (anatase to rutile) and grinding media to grinded materials were 8:2 and 4:1 respectively, and the modified density was 60%. Under this condition, the new material was capable of forming after 120-min modification. The hiding power and oil absorption of this new material were 29.12 g/m^2 and 23.30%, respectively. The results show that the modification is based on surface hydroxylation. After coating with titanium dioxide, the hiding power of calcium carbonate can be improved greatly. The new mineral composite materials can be used as the substitute for titanium dioxide. 展开更多
关键词 calcium carbonate mechano-chemical process titanium dioxide film HYDROXYLATION
下载PDF
Enhancement of corona discharge induced wind generation with carbon nanotube and titanium dioxide decoration 被引量:3
3
作者 Jianchun Ye Jun Li +2 位作者 Xiaohong Chen Sumei Huang Wei Ou-Yang 《Chinese Physics B》 SCIE EI CAS CSCD 2019年第9期282-287,共6页
Dip-coated double-wall carbon nanotubes(DWCNTs) and titanium dioxide(TiO2) sol have been prepared and smeared onto the tip of a conductive iron needle which serves as the corona discharge anode in a needle-cylinder co... Dip-coated double-wall carbon nanotubes(DWCNTs) and titanium dioxide(TiO2) sol have been prepared and smeared onto the tip of a conductive iron needle which serves as the corona discharge anode in a needle-cylinder corona system.Compared with the discharge electrode of a CNT-coated needle tip, great advancements have been achieved with the TiO_2/CNT-coated electrode, including higher discharge current, ionic wind velocity, and energy conversion efficiency,together with lower corona onset voltage and power consumption.Several parameters related to the discharge have been phenomenologically and mathematically studied for comparison.Thanks to the morphology reorientation of the CNT layer and the anti-oxidation of TiO_2, better performance of corona discharge induced wind generation of the TiO2/CNT-coated electrode system has been achieved.This novel decoration may provide better thoughts about the corona discharge application and wind generation. 展开更多
关键词 CORONA discharge INDUCED WIND WIND velocity carbon NANOTUBES titanium dioxide
下载PDF
Alloying elements characterization in a Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-1Nd titanium alloy by carbon addition 被引量:4
4
作者 ShangzhouZhang HuizhongXu +2 位作者 ZiquanLiu HuiluLi RuiYang 《Journal of University of Science and Technology Beijing》 CSCD 2005年第3期252-256,共5页
The effects of carbon addition (0.01wt%-0.43wt%) on a Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-1Nd (wt%) alloy with a bimodal microstructure were investigated. Electron probe microanalysis was carried out to examine the partitio... The effects of carbon addition (0.01wt%-0.43wt%) on a Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-1Nd (wt%) alloy with a bimodal microstructure were investigated. Electron probe microanalysis was carried out to examine the partitioning behavior of carbon and the relation of carbon content to the distributions of Al and Mo in the primary αp phase (α p) and β transformed structure (β). It was found that interstitial carbon is enriched in the α p phase and its content slightly reduces with the increase of the volume fraction of α p. The measurements of carbon content in the present alloy with an α p of 15vol% showed that the carbon content in the α p phase increases with the increment of carbon addition until a maximum but keeps almost constant in the β phase. The addition of carbon reduces the solubility of Al and Mo in the α p phase and leads to the increment of Mo partitioning to the β phase. When the carbon content is over 0.17wt% (0.67at%), carbide precipitation occurs in the matrix and its volume fraction is related to the volume fraction of α p which can be explained in term of the difference of carbon solubility in the α p and β phases. 展开更多
关键词 high-temperature titanium alloy carbon alloying elements partitioning
下载PDF
Supercritical synthesis of platinum-modified titanium dioxide for solar fuel production from carbon dioxide 被引量:3
5
作者 Susana Tostón Rafael Camarillo +2 位作者 Fabiola Martínez Carlos Jiménez Jesusa Rincón 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第4期636-650,共15页
This paper investigates the properties of TiO2‐based photocatalysts synthesised under supercriticalconditions.Specifically,the characteristics of Pt dispersed on TiO2catalysts obtained in supercriticalCO2are discusse... This paper investigates the properties of TiO2‐based photocatalysts synthesised under supercriticalconditions.Specifically,the characteristics of Pt dispersed on TiO2catalysts obtained in supercriticalCO2are discussed and compared with those of commercial TiO2.The photocatalytic activity of thesynthesised catalysts in the CO2photoreduction reaction to produce solar fuel is tested.The mainconclusion of the study is that photocatalysts with better or similar features,including high surfacearea,crystallisation degree,hydroxyl surface concentration,pore volume,absorbance in the visiblerange and methane production rate,to those of commercial TiO2may be produced for the reductionof CO2to fuel by synthesis in supercritical media. 展开更多
关键词 titanium dioxide PLATINUM PHOTOCATALYST Metal dispersion carbon dioxide photoreduction
下载PDF
Microstructural Evolution of Ti-5.6Al-4.8Sn-2Zr-1Mo-0.35Si-0.7Nd Titanium Alloy with Carbon Additions 被引量:1
6
作者 Shangzhou ZHANG Yuan GAO +2 位作者 Ziquan LIU Yuyin LIU Rui YANG 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2006年第5期616-620,共5页
The effect of carbon addition on microstructural evolution was studied in a near-α titanium alloy (Ti-5.6Al- 4.8Sn-2Zr-1Mo-0.35Si-0.7Nd). It was found that flake and ribbon titanium carbides with a NaCl crystal str... The effect of carbon addition on microstructural evolution was studied in a near-α titanium alloy (Ti-5.6Al- 4.8Sn-2Zr-1Mo-0.35Si-0.7Nd). It was found that flake and ribbon titanium carbides with a NaCl crystal structure formed in the as-cast alloys with carbon additions of over 0.17 wt pct. Flake carbide particles are the product of eutectic transformation and precipitate from the high-temperature β phase. The ribbon carbide particles are primary phases formed prior to the nucleation of any metallic phases. The as-cast alloys with carbide precipitation after heat-treatment at βt-30℃ followed by water quenching showed the spheroidization of α lamellae and partial dissolution of carbide particles. After annealing at βt+15℃, carbide particles are mostly distributed at the grain boundary and spheroidized through mixed grain boundary plus bulk diffusions. 展开更多
关键词 titanium alloy carbon Microstructure Heat treatment CARBIDE
下载PDF
Indirect mineral carbonation of titanium-bearing blast furnace slag coupled with recovery of TiO_2 and Al_2O_3 被引量:19
7
作者 Lin Wang Weizao Liu +7 位作者 Jingpeng Hu Qiang Liu Hairong Yue Bin Liang Guoquan Zhang Dongmei Luo Heping Xie Chun Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第3期583-592,共10页
Large quantities of CO2 and blast furnace slag are discharged in the iron and steel industry. Mineral carbonation of blast furnace slag can offer substantial CO2 emission reduction and comprehensive utilization of the... Large quantities of CO2 and blast furnace slag are discharged in the iron and steel industry. Mineral carbonation of blast furnace slag can offer substantial CO2 emission reduction and comprehensive utilization of the solid waste. This paper describes a novel route for indirect mineral carbonation of titanium-bearing blast furnace (TBBF) slag, in which the TBBF slag is roasted with recyclable (NH4)2SO4 (AS) at low temperatures and converted into the sulphates of various valuable metals, including calcium, magnesium, aluminium and titanium. High value added Ti-and Al-rich products can be obtained through stepwise precipitation of the leaching solution from the roasted slag. The NH3 produced during the roasting is used to capture CO2 from flue gases. The NH4HCO3 and (NH4)2CO3 thus obtained are used to carbonate the CaSO4-containing leaching residue and MgSO4-rich leaching solution, respectively. In this study, the process parameters and efficiency for the roasting, carbonation and Ti and Al recovery were investigated in detail. The results showed that the sulfation ratios of calcium, magnesium, titanium and aluminium reached 92.6%, 87% and 84.4%, respectively, after roasting at an AS-to-TBBF slag mass ratio of 2:1 and 350℃ for 2 h. The leaching solution was subjected to hydrolysis at 102℃ for 4 h with a Ti hydrolysis ratio of 95.7%and the purity of TiO2 in the calcined hydrolysate reached 98 wt%. 99.7% of aluminium in the Ti-depleted leaching solution was precipitated by using NH3. The carbonation products of Ca and Mg were CaCO3 and (NH4)2Mg(CO3)2·4H2O, respectively. The latter can be decomposed into MgCO3 at 100-200℃ with simultaneous recovery of the NH3 for reuse. In this process, approximately 82.1% of Ca and 84.2% of Mg in the TBBF slag were transformed into stable carbonates and the total CO2 sequestration capacity per ton of TBBF slag reached up to 239.7 kg. The TiO2 obtained can be used directly as an end product, while the Al-rich precipitate and the two carbonation products can act, respectively, as raw materials for electrolytic aluminium, cement and light magnesium carbonate production for the replacement of natural resources. 展开更多
关键词 Mineral carbonation CO2 sequestration Ti-bearing blast furnace slag Ammonium sulphate titanium dioxide Aluminium oxide
下载PDF
Study of Band Gap of Carbon Nanotube-Titanium Dioxide Heterostructures 被引量:1
8
作者 Marianna Barberio Pasauale Barone +4 位作者 Alessandra Imbrogno Silvestro Antonio Ruffolo Mauro La Russa Natale Arcuri Fang Xu 《Journal of Chemistry and Chemical Engineering》 2014年第1期36-41,共6页
The authors present a photoluminescence and UV (ultraviolet)-optical absorbance study on single walled carbon nanotubes CNTs (carbon nanotubes) and TiO2 mixtures. The authors observed variation of△ф = 0.6 eV in ... The authors present a photoluminescence and UV (ultraviolet)-optical absorbance study on single walled carbon nanotubes CNTs (carbon nanotubes) and TiO2 mixtures. The authors observed variation of△ф = 0.6 eV in optical gap for micrometric anatase and 0.1 eV for nanometric rutile or anatase at a concentration of CNTs of about 1.5 weight %. The large difference in △ф is attributed to differences in dimensions of dioxide grains and in morphology of CNTs/Ti02 composites. Photoluminescence emission is drastically reduced and absorption in the UV range is increased at low CNT concentration for both anatase and rutile phases. 展开更多
关键词 Optical bands titanium dioxide C-doping carbon nanotube.
下载PDF
RTV silicone rubber composites reinforced with carbon nanotubes,titanium-di-oxide and their hybrid:Mechanical and piezoelectric actuation performance 被引量:1
9
作者 Vineet Kumar Anuj Kumar +1 位作者 Sung Soo Han Sang-Shin Park 《Nano Materials Science》 CAS CSCD 2021年第3期233-240,共8页
The use of nanofillers with high surface area and extreme purity in polymer composite is an effective strategy to obtain high performance polymeric nanocomposites.Therefore,the effect of nanofillers such as carbon nan... The use of nanofillers with high surface area and extreme purity in polymer composite is an effective strategy to obtain high performance polymeric nanocomposites.Therefore,the effect of nanofillers such as carbon nanotubes(CNT),titanium dioxide(TiO_(2)),and their hybrid on rubber-based composites was studied.In this study,rubber nanocomposites were fabricated by using room temperature vulcanized(RTV)silicone rubber matrix and nanofillers(i.e.CNT,TiO_(2),and CNT-TiO_(2))through solution casting method.Here,the purity and surface area of CNT(purity:>96%and BET surface area:300 m2/g)and TiO_(2)(purity:>98%and BET surface area:165 m2/g)were estimated by field emission scanning electron microscopy/energy dispersive X-ray(FESEM-EDX)and adsorption isotherms.The mechanical properties of the rubber nanocomposites were enhanced by incorporating nanofillers.The compressive modulus was 2.18 MPa for unfilled composites and increased to 6.8 MPa(CNT),3.95 MPa(CNT-TiO_(2)),and 2.44 MPa(TiO_(2))at 5 phr,respectively.Similarly,the tensile strength was 0.54 MPa for unfilled composites and increased to 1.37 MPa(CNT),1.33 MPa(CNT-TiO_(2))and 0.61 MPa(TiO_(2))at 5 phr,respectively.Further,the actuation displacement was improved with increasing input voltage and it was 2 mm for CNT,1.6 mm for CNT-TiO_(2) hybrid and 0.5 mm for TiO_(2) at 10 kV.Moreover,a series of experiments show the potential application in piezoelectric actuation. 展开更多
关键词 Multi-walled carbon nanotubes titanium dioxide HYBRID Mechanical properties Piezoeletric actuation
下载PDF
Effect of titanium content on the precipitation behavior of carbon-saturated molten pig iron 被引量:2
10
作者 Lei-zhang Gao Tong-xiang Ma +3 位作者 Meng-jun Hu Zhi-ming Yan Xue-wei Lü Mei-long Hu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2019年第4期483-492,共10页
The use of iron ores bearing titanium as a raw material is an effective measure to prevent hearth erosion and prolong the life of a blast furnace. In this research, the effect of titanium content on the precipitation ... The use of iron ores bearing titanium as a raw material is an effective measure to prevent hearth erosion and prolong the life of a blast furnace. In this research, the effect of titanium content on the precipitation behaviors of high-melting phases of carbon-saturated molten pig iron were studied by confocal scanning laser microscopy. The results showed that, when the titanium content was less than 0.25 wt%,Fe_3C was precipitated as a single phase from the molten carbon-saturated iron. The growth rate of the precipitated Fe_3C crystals was very high, reaching 7387 μm^2/s. When the titanium content in the molten pig iron was greater than 0.47 wt%, TiC crystals precipitated first. The shape and size of the precipitated TiC crystals did not obviously change. After TiC was precipitated, the fluidity of the molten pig iron worsened. With a decrease in temperature, Fe_3C was also precipitated but the growth rate of Fe_3C was limited by the presence of the first precipitated TiC phase. The crystal size of the precipitated Fe_3C was much smaller than that of pure Fe_3C. 展开更多
关键词 carbon-saturated MOLTEN pig iron precipitation behavior titanium titanium CARBIDE CONFOCAL scanning laser microscopy
下载PDF
Grafting Carbon Nanotubes on Titanium Surface for Osteoblast Cell Adhesion and Growth
11
作者 Chang-Jiang Pan Yu-Xiao Dong Klaus D. Jandt 《Journal of Biomaterials and Nanobiotechnology》 2012年第3期353-361,共9页
Poly(ethylene glycol) (PEG) functionalized single-walled carbon nanotubes (SWCNTs) were covalently grafted on the titanium surface with the aim to provide a new platform for human osteoblast cells (HOCs) attachment. W... Poly(ethylene glycol) (PEG) functionalized single-walled carbon nanotubes (SWCNTs) were covalently grafted on the titanium surface with the aim to provide a new platform for human osteoblast cells (HOCs) attachment. Water contact angle, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) results revealed that the PEG-functionalized SWCNTs were successfully grafted onto titanium surfaces. Cell viability and proliferation showed that the number of viable cells in culture medium increased with the incubation time for both titanium and SWCNT-modified titanium samples, although the SWCNT-modified titanium presented lower cell viability compared to titanium. Cell adhesion experiments suggested that there were no obvious differences in the number of cells adhered on the titanium and PEG-SWCNT-modified titanium, and the number of adhered cells increased with the culture time. To our best knowledge, for the first time the PEG functionalized SWCNTs were grafted on the titanium surface for human osteoblast cell adhesion and growth. The strategy introduced in the present study provides a new idea for the matrix preparation based on CNTs and titanium for the biological application and the new SWCNT-titanium platform has potential applications in implantable materials and bone tissue engineering. 展开更多
关键词 carbon NANOTUBE titanium OSTEOBLAST
下载PDF
Study of Dye Absorption in Carbon Nanotube-Titanium Dioxide Heterostructures
12
作者 Marianna Barberio Alessandra Imbrogno Davide Remo Grosso Assunta Bonanno Fang Xu 《Journal of Chemistry and Chemical Engineering》 2015年第4期245-252,共8页
In this work, the authors present a study of dye absorption in TiO2 doped with CNTs (carbon nanotubes). Absorption decreases exponentially with the increase of CNTs in the film, while morphological characterization,... In this work, the authors present a study of dye absorption in TiO2 doped with CNTs (carbon nanotubes). Absorption decreases exponentially with the increase of CNTs in the film, while morphological characterization, conducted by SEM (scanning electron microscope) and TEM (transmission electron microscope) microscopes, suggests that this behavior is strongly related to morphological structure of grown films. For CNTs amounts greater than 1%, the authors observe the formation of CNTs clusters randomly distribute on TiO2 bulk, which strongly reduces the film porosity quenching the dye absorption. Comparison with optical properties of CNT/TiO2 filmstudied in the previous work, suggest that the best level of doping is with 0.5% of CNTs. FTIR (Fourier transform infrared spectroscopy) measurements conducted on a series of pristine and doped samples clearly indicate the absence of change in allotropic species of TiO2, while AFM (atomic force microscope) analysis indicates that the sample roughness strongly changes with doping, preventing the dye adsorption. Finally, measurements of cell efficiency indicate an increase of 5% in cells with 0.5% of CNT doping and a decrease for greater values. 展开更多
关键词 Graetzel cells dye adsorption titanium dioxide carbon nanotube doping.
下载PDF
The study of biocompatibility on the Carbon, Titanium and Carbon-Nitrogen Surface Modified Intraocular Lens
13
作者 Yuan Zhaoxu Gu Han Qing +2 位作者 Sun Hui Minl Yuan Jia Qin Xu Yan Shan(International Intraocular Implant Training Centre, Tianjin Medical University,Tanjin, 100070, China)(Tianjin Institute of Urologic Surgery, Tianjin,300211,China) 《Chinese Journal of Biomedical Engineering(English Edition)》 1999年第3期13-15,共3页
关键词 IOL The study of biocompatibility on the carbon titanium and carbon-Nitrogen Surface Modified Intraocular Lens
下载PDF
纺丝液配制对PI/TiO_(2)活性碳纳米纤维膜吸附性能的影响
14
作者 李学佳 董震 李大伟 《化工新型材料》 CAS CSCD 北大核心 2024年第6期155-157,共3页
以均苯四甲酸酐(PMDA)、4,4′-二氨基二苯醚(ODA)及纳米TiO_(2)为原料,采用静电纺丝及热酰亚胺化的方法制备聚酰亚胺/二氧化钛(PI/TiO_(2))复合纳米纤维膜,在高温下对PI/TiO_(2)复合纳米纤维膜进行活化处理,通过正交试验研究了PMDA与OD... 以均苯四甲酸酐(PMDA)、4,4′-二氨基二苯醚(ODA)及纳米TiO_(2)为原料,采用静电纺丝及热酰亚胺化的方法制备聚酰亚胺/二氧化钛(PI/TiO_(2))复合纳米纤维膜,在高温下对PI/TiO_(2)复合纳米纤维膜进行活化处理,通过正交试验研究了PMDA与ODA摩尔比、纳米TiO_(2)含量及纺丝液含量对PI/TiO_(2)活性碳纳米纤维膜吸附性能的影响。结果表明:PMDA与ODA摩尔比为1.03∶1、TiO_(2)质量分数为3%、纺丝液质量分数为22%时,活性碳纳米纤维薄膜的吸附性能最佳。 展开更多
关键词 聚酰亚胺 二氧化钛 静电纺丝 活性碳纳米纤维 吸附性能
下载PDF
二氧化钛/多孔碳纳米纤维复合材料的制备及其光催化性能 被引量:1
15
作者 陆瑶瑶 叶俊涛 +1 位作者 阮承祥 娄瑾 《纺织学报》 EI CAS CSCD 北大核心 2024年第4期67-75,共9页
为实现纳米二氧化钛(TiO_(2))的回收和重复使用,采用静电纺丝、高温煅烧和酸溶技术制备了多孔碳纳米纤维(PCNF),随后使用二次形核法将锐钛矿相TiO_(2)负载到其表面,得到具有光催化活性的TiO_(2)/PCNF复合材料。通过扫描电子显微镜、X射... 为实现纳米二氧化钛(TiO_(2))的回收和重复使用,采用静电纺丝、高温煅烧和酸溶技术制备了多孔碳纳米纤维(PCNF),随后使用二次形核法将锐钛矿相TiO_(2)负载到其表面,得到具有光催化活性的TiO_(2)/PCNF复合材料。通过扫描电子显微镜、X射线衍射仪、X射线光电子能谱仪、紫外-可见漫反射光谱仪等表征了TiO_(2)/PCNF复合材料的形貌结构、成分和光吸收性能,并测试了其对降解亚甲基蓝(MB)溶液的光催化性能。结果显示:复合材料的比表面积高达331.9 m^(2)/g,光照30 min后对MB溶液(5 mg/L)的去除率为98.6%,光照60 min后对MB溶液的去除率可达99.6%,均高于同等TiO_(2)含量的对比组;重复使用5次后,其对MB溶液的去除率仍然保持在95.0%;PCNF是一种性能优异的光催化载体材料,它不仅能够实现对纳米TiO_(2)的固定和回收,而且能提高TiO_(2)的光催化性能。 展开更多
关键词 有机染料 光降解 二氧化钛 静电纺丝 碳纳米纤维 亚甲基蓝 二次形核法 光催化性能 废水处理
下载PDF
秸秆水热碳化液修饰二氧化钛去除农村生活污水尾水中抗生素的动力学特征研究
16
作者 杨梖 任卓 +4 位作者 俞映倞 何世颖 吴蓉 杨林章 薛利红 《环境污染与防治》 CAS CSCD 北大核心 2024年第2期159-164,共6页
为探究秸秆水热碳化液修饰二氧化钛纳米球(SHCS&TiO_(2))去除抗生素的动力学特征,以实际农村生活污水尾水为目标处理水体,以磺胺嘧啶和红霉素为典型目标污染物,采用时间梯度实验研究和动力学模拟进行分析。结果表明:1)SHCS&TiO_... 为探究秸秆水热碳化液修饰二氧化钛纳米球(SHCS&TiO_(2))去除抗生素的动力学特征,以实际农村生活污水尾水为目标处理水体,以磺胺嘧啶和红霉素为典型目标污染物,采用时间梯度实验研究和动力学模拟进行分析。结果表明:1)SHCS&TiO_(2)去除两种抗生素的动力学特征有明显差异。去除磺胺嘧啶反应主要发生在前10 min,去除速率为2.11~2.37 mg/(L·min),最终去除率为72.6%~89.5%。去除红霉素反应主要发生在0~20、120~240 min,去除速率分别为1.65~2.34、0.32~0.42 mg/(L·min),最终去除率达到100.0%。2)Behnajady-Modirshahla-Ghanbary反应动力学模型模拟结果最佳。3)去除机制是吸附和催化共同作用,且催化起主要作用。 展开更多
关键词 秸秆 水热碳化液 二氧化钛 抗生素 动力学特征
下载PDF
基于钛质铆钉的低碳钢/钛电阻单元焊接接头的组织与性能
17
作者 田浩楠 王楠楠 +2 位作者 朱少航 石红信 邱然锋 《材料热处理学报》 CAS CSCD 北大核心 2024年第10期192-201,共10页
以钛质铆钉作为单元件对2 mm厚的钛和Q235低碳钢板进行电阻单元焊。利用扫描电镜观察接头中各区域的微观组织结构,分析了焊接参数对接头抗剪载荷和十字抗拉载荷的影响。结果表明:低碳钢/钛电阻单元焊接接头的抗剪载荷与十字抗拉载荷随... 以钛质铆钉作为单元件对2 mm厚的钛和Q235低碳钢板进行电阻单元焊。利用扫描电镜观察接头中各区域的微观组织结构,分析了焊接参数对接头抗剪载荷和十字抗拉载荷的影响。结果表明:低碳钢/钛电阻单元焊接接头的抗剪载荷与十字抗拉载荷随焊接电流、焊接时间的增加而呈现先增大后减小的趋势。当铆钉腿径为8 mm、焊接时间为300 ms、焊接电流为12 kA时,接头的抗剪载荷与十字抗拉载荷分别为11.26和7.39 kN。采用电阻单元焊焊接低碳钢/钛时,铆钉的腿径在4~8 mm范围内,所用铆钉的腿径越大,适焊窗口越宽。 展开更多
关键词 低碳钢 电阻单元焊
下载PDF
TiO_(2)催化剂催化CO_(2)还原的研究进展
18
作者 王嘉曼 熊靖 +2 位作者 师金鸽 韦岳长 霍开玲 《石油化工高等学校学报》 CAS 2024年第4期1-11,共11页
碳排放量的不断增加导致环境问题日益严重,寻找解决途径已成为全球共同关注的焦点。通过光催化、电催化还原CO_(2)可以将其转化为有用的燃料或化学品。TiO_(2)因具有化学性质稳定、催化活性高、价格低廉、无毒无污染等优点而备受青睐。... 碳排放量的不断增加导致环境问题日益严重,寻找解决途径已成为全球共同关注的焦点。通过光催化、电催化还原CO_(2)可以将其转化为有用的燃料或化学品。TiO_(2)因具有化学性质稳定、催化活性高、价格低廉、无毒无污染等优点而备受青睐。综述了光催化CO_(2)还原和电催化CO_(2)还原的反应机理;阐述了TiO_(2)在光催化和电催化还原CO_(2)中的应用和优势、不同表面改性技术对TiO_(2)的催化性能的影响以及TiO_(2)的形貌对CO_(2)还原催化活性和选择性的影响;对TiO_(2)基催化剂催化性能的提升方法进行了讨论。综述为可持续碳转化提供科学基础,并有助于进一步实验和理论探索TiO_(2)的作用机理。 展开更多
关键词 二氧化钛 二氧化碳还原反应 光催化 电催化 光电催化
下载PDF
激光刻蚀缺陷增强Pt/TiO_(2)光催化还原CO_(2)性能的实验研究
19
作者 张文斐 张元 +2 位作者 周屈兰 李娜 刘东霞 《西安交通大学学报》 EI CAS CSCD 北大核心 2024年第10期199-211,共13页
针对二氧化钛(TiO_(2))在光催化反应中光响应能力差、光生载流子易复合等问题,采用激光刻蚀方法对锐钛矿TiO_(2)进行改性,并对其由于激光刻蚀造成的结构和性质变化,以及Pt负载后的金属-载体相互作用特征进行研究。实验结果表明:激光刻... 针对二氧化钛(TiO_(2))在光催化反应中光响应能力差、光生载流子易复合等问题,采用激光刻蚀方法对锐钛矿TiO_(2)进行改性,并对其由于激光刻蚀造成的结构和性质变化,以及Pt负载后的金属-载体相互作用特征进行研究。实验结果表明:激光刻蚀导致锐钛矿TiO_(2)的晶粒尺寸增大,形成金红石相,并在TiO_(2)中产生了氧空位(O_(v))和Ti^(3+)缺陷,导致其带隙缩小以及对可见光的响应增强;与原始TiO_(2)中存在的缺陷相比,激光刻蚀诱导的缺陷更稳定,还原性更强,因而以缺陷型TiO_(2)作为载体制备的缺陷型Pt/TiO_(2)催化剂中的金属-载体相互作用也更剧烈,具有更强的电子转移能力和载流子分离性能,在光催化还原二氧化碳(CO_(2))过程中表现出极佳的反应活性和产物选择性。该结果可为激光刻蚀催化剂载体及催化剂在光催化中的材料特性和催化应用研究提供理论支持。 展开更多
关键词 激光刻蚀 二氧化钛 载体缺陷 金属-载体相互作用 二氧化碳 光催化
下载PDF
电感耦合等离子体质谱(ICP-MS)法测定锆钛矿中的铪
20
作者 郭晓瑞 赵一帆 +3 位作者 毛香菊 王甜甜 樊蕾 肖芳 《中国无机分析化学》 北大核心 2024年第3期306-311,共6页
锆钛矿中存在耐高温的锆、钛化合物,铪以类质同象进入锆矿物中,准确测定锆钛矿中的铪对选矿研究、矿物综合利用及工业生产有重要作用。通过考察锆钛矿成分及熔融方法,以碳酸钠-硼砂高温熔融锆钛矿,以178 Hf为分析同位素及185 Re为内标,... 锆钛矿中存在耐高温的锆、钛化合物,铪以类质同象进入锆矿物中,准确测定锆钛矿中的铪对选矿研究、矿物综合利用及工业生产有重要作用。通过考察锆钛矿成分及熔融方法,以碳酸钠-硼砂高温熔融锆钛矿,以178 Hf为分析同位素及185 Re为内标,使用电感耦合等离子体质谱法测定锆钛矿中含量不均的铪。结果表明,碳酸钠-硼砂高温熔融效果最好,可完全溶解耐高温难分解的锆钛矿,当碳酸钠-硼砂质量配比为2∶1时熔融效果最佳。ICP-MS蠕动泵转速为45 r/min、雾化气流量为1.06 L/min时雾化效率最优。在选定的实验条件下,HfO_(2)质谱强度与质量浓度在0.01~250 ng/mL呈良好的线性关系,相关系数为0.9997,背景等效浓度为0.029 ng/mL,方法检出限为0.0032 ng/mL。按实验方法对中国国家标准物质中的HfO_(2)进行测定,测定值与认定值一致,相对标准偏差在1.6%~3.2%。按实验方法对锆钛矿样品中的HfO_(2)进行测定并进行加标回收实验,测定结果的相对标准偏差(RSD,n=9)为0.90%~3.4%,加标回收率在96.0%~106%,满足国家地质矿产行业标准DZ/T 0130—2006的要求。 展开更多
关键词 锆钛矿 碳酸钠-硼砂熔融法 电感耦合等离子体质谱法(ICP-MS) 雾化效率
下载PDF
上一页 1 2 43 下一页 到第
使用帮助 返回顶部