延卫
环境友好材料、光催化材料、新能源的利用与开发、导电高分子材料、水处理。
个性化签名
- 姓名:延卫
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师, 教育部“新世纪优秀人才支持计划”入选者
- 职称:-
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学科领域:
环境科学技术
- 研究兴趣:环境友好材料、光催化材料、新能源的利用与开发、导电高分子材料、水处理。
延卫,教授,教育部新世纪优秀人才。陕西省化学会青年工作指导委员会委员。1987~1991: 南开大学化学系物理化学专业学士;1991~1994: 南开大学化学系有机化学专业硕士;1994~1997: 南开大学高分子所高分子化学与物理专业博士;1999~2000: 台湾新竹交通大学应化系博士后;2001~2005: 西安交通大学动力工程多相流国家重点实验室博士后;1997~2002: 西安交通大学环境与化学工程学院高分子材料与工程系任教;2002~至今: 西安交通大学能源与动力工程学院环境科学与工程系任教。
研究方向:环境友好材料、光催化材料、新能源的利用与开发、导电高分子材料、水处理。
个人主页:http://gr.xjtu.edu.cn:8080/web/yanwei
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1256
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成果数
20
延卫, Yao Jun Zhang a, *, Wei Yan b, Yan Pei Wu a, Zhen Huan Wang a
Materials Letters 62 (2008) 3846-3848,-0001,():
-1年11月30日
The CdS/TiO2NTs composite was prepared by a simple two-step chemical solution routes to directly transfer trititanate nanotubes to TiO2NTs and simultaneously coupled with CdS nanoparticles. The results of XRD, TEM, Diffuse reflectance UV–Visible absorption spectra revealed that the CdS nanoparticles were homogeneously embedded on the surface of TiO2NTs and the absorption spectrum of TiO2NTs was extended to visible region. The activity of hydrogen production by photocatalytic water decomposition for the CdS/TiO2NTs composite was examined under visible light irradiation (λN400 nm) and the quantity of H2 evolution was ca. 1708 μL/g for 6h.
Nanocomposites, Photochemical technology, Production of hydrogen, Photocatalytic water, decomposition
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延卫, Xiao Feng*, Wenyi Mao, Wei Yan
I NTERNATI ONAL JOURNAL OF HYDROGEN ENERGY 33 (2008) 3644-3650,-0001,():
-1年11月30日
The hydrogen production from photocatalytic water decomposition is one of the best approaches that convert solar energy to hydrogen energy. At present, the hydrogen production from photocatalytic water decomposition has a low efficiency. In order to determine a valuable hydrogen production process from photocatalytic water decomposition in the aspect of energy conversion, the concept of critical conversion efficiency of light energy is proposed in this paper. Critical conversion efficiency of light energy is defined as the conversion efficiency of light energy when the hydrogen energy output is equal to an equivalent energy input of the system. The criterion introduced is that only if the conversion efficiency of light energy is greater than the critical one, an energy profit can be achieved in a system. A hypothetical system with 20,000 tons annual hydrogen production by using Na2S/Na2SO3 as the sacrificial reagent is analyzed and calculated in this paper to determine the critical conversion efficiency of light energy by means of energy balance, cumulative exergy balance, and emergy balance, respectively. The results show that the critical conversion efficiency of light energy determined by emergy balance is the most reasonable, which gives the figure around 15%.
Hydrogen production, Energy efficiency, Photocatalysis, Water decomposition
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【期刊论文】Synthesis and formation mechanism study of rectangular-sectioned polypyrrole micro/nanotubules
延卫, Wei Yan*, Jie Han
Polymer 48 (2007) 6782-6790,-0001,():
-1年11月30日
Aligned polypyrrole (PPy) micro/nanotubules were synthesized via a self-assembly method using FeCl3 as oxidant and Acid Red 1 (C.I. 18050, 5-(acetylamino)-4-hydroxy-3-(phenylazo)-2,7-naphthalenedisulfonic acid) as dopant. PPy has a typical length of 530 mm and a unique rectangular-sectioned morphology. Its general morphology could be manipulated by varying synthetic conditions including polymerization time, monomer concentration, oxidant species, and stirring. The synthesized PPy and reaction intermediates were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), and solubility tests in methanol and water. Our observation and results suggest a plausible formation mechanism of rectangular-sectioned PPy micro/nanotubules. AR1eFe(II) complex formed from the complexation of Acid Red 1 and Fe2þ(reduced from Fe3þ), which precipitated in the aqueous solution, might have functioned as"template"during the polymerization of pyrrole monomers. The conductivity of PPy with different morphologies was also measured and compared.
Polypyrrole, Rectangular, Micro/, nanotubules
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【期刊论文】A composite visible-light photocatalyst for hydrogen production
延卫, Yiliang Liu a, Liejin Guoa, *, Wei Yan a, Hongtan Liu a, b
Journal of Power Sources 159 (2006) 1300-1304,-0001,():
-1年11月30日
A composite photocatalyst, Pd-TiO2-xNx-WO3, was synthesized by the template method and characterized by energy dispersive X-ray microanalysis (EDX), X-ray diffraction (XRD), UV-vis spectrometer, and scanning electron microscope (SEM). The results of EDX analysis reveals that the molecular formula of the composite photocatalyst can be expressed as Pd-TiO1.72N0.28-WO3. The UV–vis absorption spectrum indicates that the absorption edge of the catalyst red-shifts to around 600 nm. Under the irradiation with ultraviolet and visible light, the catalyst showed good performance for photocatalytic hydrogen production with a Na2S/Na2SO3 system as the sacrificial agent.
Photocatalyst, TiO2, Hydrogen, Visible light
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【期刊论文】A novel composite photocatalyst for water splitting hydrogen production
延卫, Honghui Yang a, Liejin Guoa, *, Wei Yan a, Hongtan Liu a, b
Journal of Power Sources 159 (2006) 1305-1309,-0001,():
-1年11月30日
A novel composite photocatalyst, Pt-TiO2-xNx-WO3 was synthesized by the template method and characterized by X-ray diffraction (XRD), ultraviolet-visible light diffusion spectroscopy (UV-vis), and element analysis. XRD spectra indicated that the photocatalyst was in anatase form and the diagnostic peak for WO3 existed. Combined with the XRD spectra and the results of elemental analysis, the formula of the composite photocatalyst was determined to be Pt-TiO2-xNx-WO3. UV-vis spectra showed the absorption edge was red-shifted to around 750 nm. Under the irradiation of ultraviolet, and with Na2S/Na2SO3 as the sacrificial reagent, the composite photocatalyst showed higher hydrogen production activity than anatase TiO2, and under irradiation with visible light (λ>400nm) it showed higher hydrogen production activity than TiO2-xNx while the anatase TiO2 showed negligible activity. An explanation was put forward for the mechanism of the red-shift of the absorption edge and the hydrogen production activity improvement.
Photocatalyst, Composite photocatalyst, Nitrogen-doped titania, Hydrogen production
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延卫, Chanjuan Xing, Yaojun Zhang, WeiYan, Liejin Guo*
International Journal of Hydrogen Energy 31 (2006) 2018-2024,-0001,():
-1年11月30日
A series of Cd1−xZnxS (x=0-0.92) photocatalysts were prepared by coprecipitation method and were calcined at 723K under N2 atmosphere. X-ray diffraction patterns results showed that the solid solution of Cd1-xZnxS were formed between ZnS and CdS. UV-Vis spectra indicated that the absorption edges of Cd1-xZnxS were red-shifted as the value of x decreased. The band gaps of the photocatalysts were estimated to be between 2.20-3.12 eV (x=0-0.92) from the onsets of the absorption edges and almost showed linear variation with x increasing. The position of conduction band for solid solution is shifted towards more negative potential as compared to that of CdS. The hydrogen productions of Cd1-xZnxS (x=0-0.92) by splitting water photocatalytically under ultraviolet and visible light irradiation were carried out in an inner-irradiation type reactor. The results indicated that the photocatalyst of Cd0.62Zn0.16S has the highest rate of hydrogen evolution with the quantum efficiency of 2.17%and 0.60%under ultraviolet and visible light irradiation, respectively. It has been considered that the crystallite size, (101) plane and band gap for the Cd1-xZnxS solid solutions have a strong influence on the efficiency of hydrogen production capability for water splitting.
Cd1−xZnxS solid solution, Photocatalysts, Band gap, Production of hydrogen, Water splitting
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【期刊论文】Preparation of PLGA Electrospun Nanofibers for Tissue Engineering Applications*
延卫, DUAN Yuan-yuan, JIA Jun, WANG Shao-hai, YAN Wei, JIN Lei, WANG Zhong-yi
Jan. 2007, Volume 4, No.1 (Serial No.26),-0001,():
-1年11月30日
Non-woven poly (lactic-co-glycolic acid) (PLGA) nanofibers were prepared by electrospinning technology. The morphology of the electros pun fibers was observed using scanning electron Microscopy (SEM) and the fiber diameter was calculated. Primary human dermal fibroblasts (HDFs) were cultured to evaluate the biocompatibility of the electrospun PLGA nanofibers. The results of MTT testing and SEM showed that the PLGA nanofibers have the morphology of interwoven and highly porous structure and can support the attachment and proliferation of HDFs. It is can be expected to be a potential scaffold material for tissue engineering.
electrospinning, PLGA, tissue engineering
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延卫, 徐浩, 冯江涛
化工进展,2008,27(10):1561~1568,-0001,():
-1年11月30日
近年来,聚苯胺因其优良的性能而备受关注,其合成方法与合成机理一直是聚苯胺研究的重要内容之一.本文详细阐述了聚苯胺的化学和电化学合成方法,并对两类合成方法的反应机理进行了综述。
聚苯胺, 合成方法, 聚合机理
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延卫, 徐浩, 汤成莉
净水技术,2008,27(3):9-13,-0001,():
-1年11月30日
主要综述了水系统中水垢的种类、形成机理及其物理防治方法。详细阐述了静电、电子以及磁化等物理控垢法的工行原理技术要点,并指出了其发展方向。
水垢, 形成机理, 物理防治方法
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【期刊论文】太阳能光催化分解水制氢体系能量转换效率及量子产率的实验测定与计算
延卫, 张耀君, , 郭烈锦, 赵亮, 杨鸿辉, 李明涛, 许云波
太阳能学报,2006,27(11):1113~1116,-0001,():
-1年11月30日
对太阳能光催化分解水制氢体系的阈值能、太阳能转换效率以及太阳能转化成可储存的化学能效率进行了阐述;建立了一种利用已知量子产率的化学光量计测定光子数绝对值的实验方法,并使用该方法对太阳能光催化分解水制氢体系的能量转换效率及产氢的量子产率进行子计算。
能量转换效率, 量子产率, 光催化分解水制氢体系
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