乳状液膜对镉（Ⅱ）的迁移行为及其分离

１引言利用液膜分离技术提取与分离金属离子的研究已有报道，但利用三异辛胺（ＴＩＯＡ）作为液膜的载体分离金属离子的研究还未见报道。本文研究了以ＴＩＯＡ为载体的乳状液膜迁移Ｃｄ（Ⅱ）的行为及机理。试验表明，ＴＩＯＡ＋Ｓｐａｎ８０十二甲苯乳状液膜体系能使Ｃｄ（Ⅱ）得到快速、完全迁移，并能使其与常见离子得到完全分离。２实验部分２．１仪器与试剂高速搅拌制乳器（自制）；７２１型分光光度计；Ｃｄ（Ⅱ）标准液，１ｇ／Ｌ；Ｓｐａｎ８０和ＴＩＯＡ分别配制成１０％（Ｗ／Ｖ）和０．１０ｍｏｌ／Ｌ的二甲苯溶液；所用其它试剂…     

SELF SUSTAINED SURFACE CHEMICAL OSCHLATION AND IT＇S MATHEMATICAL SIMULATION OF THE COMPLETE OXIDATION OF MATHANOL OVER Pt／Al_2o_3 CATALYST

ＳＥＬＦＳＵＳＴＡＩＮＥＤＳＵＲＦＡＣＥＣＨＥＭＩＣＡＬＯＳＣＨＬＡＴＩＯＮＡＮＤＩＴ’ＳＭＡＴＨＥＭＡＴＩＣＡＬＳＩＭＵＬＡＴＩＯＮＯＦＴＨＥＣＯＭＰＬＥＴＥＯＸＩＤＡＴＩＯＮＯＦＭＡＴＨＡＮＯＬＯＶＥＲＰｔ／Ａｌ_２ｏ_３ＣＡＴＡＬＹＳＴＣｏｎｇＱ...     

TiO2纳米粒子膜表面性质的研究

ＴｉＯ_２纳米粒子膜在光催化降解大气和水中的污染物［１］、光电转换［２］、光致变色［３］等方面有广阔的应用前景,近年来受到了科学界的高度重视．研究表明,膜的表面性质对如上应用有着重要影响．本文采用等离子体化学气相沉积法（ＰＥＣＶＤ法）［４］制备了ＴｉＯ２的纳米粒子膜,分别采用ＴｉＣｌ４等离子体或Ｏ２等离子体处理膜表面,获得两种不同表面性质的ＴｉＯ２纳米粒子膜;并利用表面光电压谱（ＳＰＳ）和电场诱导表面光电压谱（ＥＦＩＳＰＳ）技术对膜的表面性质进行具体分析,探讨了其在光催化领域的可能应用．１实验部…     

THE APPLICATION OF Cu（facam）2 TO THE ASYMMETRIC CYCLOPROPANATION OF 2，5－DIMETHYL－2，4－HEXADIENE

ＴＨＥ　ＡＰＰＬＩＣＡＴＩＯＮ　ＯＦ　Ｃｕ（ｆａｃａｍ）２　ＴＯ　ＴＨＥ　ＡＳＹＭＭＥＴＲＩＣ　ＣＹＣＬＯＰＲＯＰＡＮＡＴＩＯＮ　ＯＦ　２，５－ＤＩＭＥＴＨＹＬ－２，４－ＨＥＸＡＤＩＥＮＥＴＨＥＡＰＰＬＩＣＡＴＩＯＮＯＦＣｕ（ｆａｃａｍ）２ＴＯＴＨＥ...     

TiO2负载膜的制备、表征及光催化性能

采用溶胶－凝胶法制备了ＴｉＯ２纳米浸渍 法将其负载于颗粒形活性炭的表面制成ＴｉＯ２负载,利用ＳＥＭ,ＥＤＳ和ＸＲＤ等手段对膜的形貌、均匀性及晶型等进行了表征,并通过甲基橙水溶液的光催化降解反应考察了该负载膜的光催化活性。     

PREPARATION OF A NEW ZEOLITE CATALYST FOR HYDRATION OF PROPYL ENE TO ISOPROPANOL

ＰＲＥＰＡＲＡＴＩＯＮＯＦＡＮＥＷＺＥＯＬＩＴＥＣＡＴＡＬＹＳＴＦＯＲＨＹＤＲＡＴＩＯＮＯＦＰＲＯＰＹＬＥＮＥＴＯＩＳＯＰＲＯＰＡＮＯＬＬｉＷｅｉ，ＴａｏＫｅｙｉ，ＬｉＨｅｘｕａｎ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＮａｎｋａｉＵｎｉｖｅｒ...     

TiO2光谱化反应及其在废水处理中的应用

ＴｉＯ多相光催化能利用太阳能有效降低多种对环境有害的污染物，使有害物质矿化为ＣＯ２、Ｈ２Ｏ及其它无机小分子物质。本文综述了ＴｉＯ２光催化的机理，提高光催化能力的途径，多种具有代表性污染物的光催化降解处理方法，以及目前尚存在的一些问题，扼要介绍了近年来ＴｉＯ２ｚ光催化反应及其在废水处理中应用的研究进展及应用前景。     

EFFECT OF W MODIFICATION ON AROMATIZATION PERFORMANCE OF ZSM-5 ZEOLITES

ＥＦＦＥＣＴ　ＯＦ　Ｗ　ＭＯＤＩＦＩＣＡＴＩＯＮ　ＯＮＡＲＯＭＡＴＩＺＡＴＩＯＮ　ＰＥＲＦＯＲＭＡＮＣＥ　ＯＦ　ＺＳＭ－５　ＺＥＯＬＩＴＥＳＷａｎｇ，Ｌｉｎ－ｓｈｅｎｇ；Ｘｉｅ，Ｍａｏ－ｓｏｎｇ；Ｘｕ，Ｇｕｉ－ｆｅｎａｎｄＴａｏ，Ｌｏｎｇ－ｘｉａｎｇ...     

OXIDATIVE METHYL ATION OF TOL UENE WITH METHANE OVER BASIC ZEOL ITE CATAL YSTS

ＯＸＩＤＡＴＩＶＥＭＥＴＨＹＬＡＴＩＯＮＯＦＴＯＬＵＥＮＥＷＩＴＨＭＥＴＨＡＮＥＯＶＥＲＢＡＳＩＣＺＥＯＬＩＴＥＣＡＴＡＬＹＳＴＳ＊ＺｈｏｕＬｉｎｇｐｉｎｇ，ＴａｏＫｅｙｉ＊＊，ＺｈａｎｇＭｉｎｇｈｕｉ，ＳｕＭｉｎｇ，ＬｉＨｅｘｕａｎ（Ｄｅｐａｒｔｍ...     

SIMULATION CALCULATION FOR CHEMICAL SPECIATION OF LEAD BY FEEDBACK NEURAL NETWORK

ＳＩＭＵＬＡＴＩＯＮＣＡＬＣＵＬＡＴＩＯＮＦＯＲＣＨＥＭＩＣＡＬＳＰＥＣＩＡＴＩＯＮＯＦＬＥＡＤＢＹＦＥＥＤＢＡＣＫＮＥＵＲＡＬＮＥＴＷＯＲＫ￥ＨｕａＭＯ；ＢｏＤＥＮＧ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＴｓｉｎｇｈｕａＵｎｉｖｅｒｓｉｔｙ...     

担载材料对TiO2薄膜光催化活性的影响

TiO_2 nanocrystalline films were prepared on glass, ITO and p-Si substrates. Degradation of Rhodamine B was used to assess the photocatalytic activity of the films. It was found that photocatalytic activity of TiO2 films on ITO and p-Si are higher than that on glass, and the film grown on ITO is the best. In addition, crystalline phases and surface morphology of TiO_2films were also affected by different substrates. Surface Photovoltage Spectra was used to analyze surface states and energy levels of the films. Separation of photogenerate electrons and holes was promoted due to matching of the energy levels between TiO_2 films and ITO as well as p-Si. High photocatalytic activity was then obtained because more photogenerate electrons and holes took part in photocatalytic reaction on TiO_2 surfaces.     

不同导电基底对TiO2薄膜光致亲水性的影响

分别在导电铝合金片(Al)和具有阳极氧化铝层的非导电铝片(AAO/Al), 以及铟锡氧化物导电玻璃(ITO/glass)和普通非导电玻璃(glass)表面通过提拉法制备出TiO2/Al和TiO2/AAO/Al, 以及TiO2/ITO/glass和TiO2/glass两组TiO2薄膜样品, 通过测试紫外光照下水滴接触角的变化考察TiO2薄膜的光致亲水性. 结果表明, 相对于TiO2/Al2O3/Al, 基底导电的TiO2/Al表现出较好的光致亲水性能; 而相对于TiO2/glass, 基底导电的TiO2/ITO/glass表现出较差的光致亲水性能. 分析认为, Al和ITO两导电基底和TiO2薄膜间的不同电子转移方向影响TiO2薄膜的光致亲水性能, Al片提供电子给TiO2有助于提高以光生电子为主要初级活性物种的光致亲水性, 而ITO接受TiO2的光生电子, 导致光致亲水性的下降.     

Effects of electron transfer between TiO2 films and conducting substrates on the photocatalytic oxidation of organic pollutants

TiO2 films on Al alloy (Al), indium-tin oxide glass (ITO/glass), and glass were prepared by a dip-coating method. ITO is found to have a higher work function, while the work function for Al is lower than that of TiO2 films. An electron transfer is indicated to occur in the interfaces between TiO2 films and conducting substrate Al or ITO, which results in an Ohm contact or Schottky barrier under the transient equilibrium UV radiation conditions. Photocatalytic measurements showed that the TiO2 films on Al have a higher activity for photocatalytic oxidation of C2H4, but the activity for photocatalytic degradation of oleic acid is lower as compared with TiO2 films on glass. Alternatively, TiO2 films on ITO give completely contrary photocatalytic performance to those on Al. These observations could be associated with the electron transfer, in which Al acts as an electron donor and offers electrons to TiO2, allowing photocatalytic oxidation of ethylene to proceed by the photogenerated electrons, while ITO could be an acceptor for the photogenerated electrons, which is beneficial to photocatalytic degradation of oleic acid by the photogenerated holes. This electron-transfer model could be extended to other photocatalytic systems.     

光电流法研究TiO2薄膜表面吸附氧对光催化活性的影响

采用溶胶-凝胶法制备了锐钛矿型和金红石型TiO2薄膜, 利用光电流和XPS技术研究了薄膜表面吸附氧对不同晶型TiO2光催化活性的影响. 并通过降解纯的环己烷溶液的实验来评估不同晶型TiO2的光催化活性. 结果表明, 在相同条件下, 锐钛矿型TiO2比金红石型具有明显的光催化活性. 这是由于锐钛矿型TiO2比金红石型TiO2具有较强的吸附氧的能力, 同时其光生电子与空穴的复合率相对较小所致.     

Cu-TiO_2/ITO膜的制备、表征及其光电化学活性的研究

以甲酸作空穴捕获剂,采用直接光还原法将Cu2+沉积到TiO2膜表面制备纳米Cu TiO2/ITO膜.并分别应用紫外可见光漫反射、X 射线衍射、扫描电镜及光开路电压等实验表征.再以甲酸为模型化合物,研究Cu沉积和外加电场对TiO2光催化活性的协同增强作用.结果表明:沉积在TiO2膜表面的铜是以Cu(0)形式存在,Cu沉积对抑制光生电子 空穴的复合有明显的促进作用.于Cu TiO2/ITO膜电极施加适当正偏压,即能明显提高其催化活性.在本文实验条件下,以外加电场和Cu沉积相结合能使TiO2光催化降解甲酸的速率常数增加2.8倍.     

多孔TiO2薄膜自洁净玻璃的亲水性和光催化活性

亲水性多孔TiO₂薄膜自洁净玻璃以含聚乙二醇的钛醇盐溶胶前驱体中通过浸渍提拉法制备;随着前驱物中聚乙二醇加入量的增加,多孔TiO₂薄膜表面的羟基含量也增加,薄膜表面的亲水性增强,水与薄膜表面的接触角下降为0°.该亲水性多孔TiO₂薄膜自洁净玻璃具有明显的自洁净和易清洗功能.紫外-可见光透过光谱分析表明,随着TiO₂薄膜中孔径的增大,光的散射增强,透光率减小.该TiO₂镀膜玻璃对于紫外线具有吸收作用.甲基橙水溶液的光催化降解实验表明,在TiO₂薄膜中引入适当大小的微孔可显著增强薄膜的光催化活性,但当孔径接近400nm时,薄膜的光催化活性减弱.     

Ag/TiO2对含酚废水的光电催化降解

Ag/TiO2对含酚废水的光电催化降解;Ag/TiO2; 光电催化; 苯酚;电解质     

玻璃和石英基体上沉积的TiO2薄膜的光催化性能

采用直流磁控反应溅射法,在玻璃和石英基体上制备了TiO2薄膜.在氧气流速超过阈值的条件下溅射,能够得到均匀透明的TiO2薄膜.在玻璃和石英基体上制备的薄膜都由均匀的锐钛矿型氧化钛晶粒组成,在晶粒中间分布着微小的孔隙.尽管在整个光谱区域内石英基体的透射率都比玻璃基体高,但在两种基体上制备的TiO2薄膜的光谱吸收边沿基本相同.薄膜中的Ti都以Ti4 形式存在.两种TiO2薄膜光催化降解甲基橙的能力相差不大.     

瞬态光电导谱研究Pt的负载对TiO2光生载流子寿命的影响

采用瞬态光电导谱研究了TiO₂的光电导衰减曲线,通过计算机拟合得到光生载流子的寿命,并考察了Pt的负载量对TiO₂光生载流子有效寿命的影响.结果表明,增大Pt的负载量,可延缓光电导的衰减趋势,从而延长TiO₂光生载流子的有效寿命,有效地降低了光生载流子的复合率.     

Photoinduced hydrophilic and photocatalytic response of hydrothermally grown TiO2 nanostructured thin films

It is demonstrated that nanostructured titanium (IV) oxide (TiO₂) films can be deposited on glass substrates at 95 °C using hydrothermal growth, their properties being greatly affected by the substrate materials. Anatase TiO₂ films grown on ITO for deposition period of 50 h were observed to exhibit a very efficient, reversible light-induced transition to super-hydrophilicity, reaching a nearly zero contact angle. Enhanced photocatalytic activity (65%) was found for the rutile TiO₂ samples grown on microscope glass, possibly due to their higher roughness with respect to anatase grown on ITO. The effect of the substrate material used is discussed in terms of the TiO₂ phase and morphology control, for the best photoinduced hydrophilic and photocatalytic performance of the samples.