纳米二氧化钛/丝素复合膜的制备及其光催化甲基橙的研究

制备了纳米二氧化钛/丝素复合膜,并用原子力显微镜、X射线能谱和红外光谱对复合膜进行了表征,以甲基橙为例,考察了复合膜的光催化行为。结果表明复合膜制备方法合理,当纳米二氧化钛与丝素质量比为0.1%时,其以粒径50nm左右均匀分散于复合膜中,复合膜与普通丝素膜仅存在细微的构象差异,复合膜表现出较优异的光催化性能,甲基橙降解率可达91%,符合Langmuir Himshelwood模型。     

含二氧化钛纳米复合膜的制备及对甲基橙的光催化降解

采用层层(LbL)自组装技术制备了含TiO2的复合膜.原子力显微镜(AFM)表征发现TiO2纳米粒子和磷钨酸聚阴离子被成功的组装到了复合膜中;以甲基橙染料废水的降解反应为模型,研究了纳米复合膜催化剂的光催化效率,发现(TiO2/PW12)n复合膜的光催化效率明显低于(PSS/TiO2)10,说明在pH值为6.4的近中性条件下,TiO2和PW12间没有表现出协同效应;同时考察了甲基橙初始浓度和复合膜中聚电解质层的影响.通过LbL技术把催化剂固载在玻璃片上解决了催化剂的回收问题,而且多层膜被重复使用四次后仍能保持较高的催化活性.     

木质纳米纤维/纳米TiO2复合膜的制备及性能表征

以杨木化机浆为原料,经对甲基苯磺酸水解和机械处理得到木质纳米纤维,与纳米TiO2均匀分散抽滤干燥得到木质纳米纤维/纳米TiO2复合膜材料,研究纳米TiO2添加量对复合膜表面形貌、力学性能和热稳定性的影响.结果表明,木质纳米纤维和纳米TiO2的平均尺寸均在几十纳米,随着纳米TiO2添加量的增加,复合膜的表面形貌由光滑变得...     

纳米二氧化钛/壳聚糖复合膜的光催化性能

利用壳聚糖与胶体TiO2的共混液通过流延成膜法制备了纳米TiO2/壳聚糖复合膜.用X-射线衍射仪和扫描电子显微镜表征了复合膜内TiO2的晶体结构和形貌,并研究了复合膜的力学性能、溶胀率、热稳定性及其在日光下对甲基橙水溶液的催化降解性能.结果表明,复合膜内TiO2为200～500 nm厚的层状晶体;在太阳光下照射60 min,交联复合膜对甲基橙水溶液的光催化降解率达70%;随着复合膜中TiO2的质量分数从1.96%增加到4.52%,复合膜的溶胀率从68.50%降低到62.21%,而拉伸强度达到最大值67.78 MPa;热分解温度为312℃.所制得的复合膜在日光下能快速降解甲基橙,可为利用太阳能处理染料废水提供一种新材料.     

纳米二氧化钛薄膜的制备及性能研究

用溶胶-凝胶法在清洁的玻璃表面成功制备了均匀透明的纳米TiO2薄膜,并用X射线衍射仪,扫描电镜,红外光谱仪和接触角测定仪等对薄膜的结构和性质进行了研究.结果表明:薄膜由晶粒大小为20～45 nm的TiO2球型颗粒组成,膜表面均匀,结构致密,具有平整的组织结构;随热处理温度的增加,TiO2薄膜的晶相由无定型态转变成锐钛矿,最后在850℃热处理后完全转变成金红石相,且TiO2薄膜在经过紫外光的照射后亲水能力增强.     

纳米二氧化钛的制备技术研究

本文综述了纳米二氧化钛的制备技术。介绍各种制备技术的基本原理，比较各种制备方法制备的纳米二氧化钛的性能，并指出了各种制备技术的特点。     

载银纳米二氧化钛的制备及抗菌性能研究

以碳酰二胺为沉淀剂与TiOSO4溶液反应生成Ti(OH)2沉积于AgCl晶种表面制备载银纳米二氧化钛,产物对金黄色葡萄球菌(S.aureus)、大肠杆菌(E.coli)和白色念珠菌(C.albicans)达到99%抗菌率的最小浓度分别是90、70、60 mg/L,经电子透射显微镜(TEM)表征,粒径主要分布于100～200 nm。     

纳米结构TiO2微孔复合膜的研制

本文用异丙醇钛经溶胶－凝胶过程制得了二氧化钛粒子溶胶，确定成膜时的烧结温度，制得的膜经SEM测试具有典型的不对称结构，用压汞法测量孔径分布在2．7－11nm范围内。     

纳米二氧化钛的制备及应用研究

纳米二氧化钛作为一种新型的高性能材料,近年来受到了国内外研究人员的关注,并在相当广泛的领域中得到应用。本文从制备工艺和应用两方面详细阐述了国内外纳米二氧化钛的研究进展和发展现状。且对现存的制备方法进行比较,并指出了其优缺点;并对其发展前景进行了展望。     

二氧化钛纳米空心球的制备

中空结构的二氧化钛材料由于制备简单、光催化能力好,使得其具有较高的应用前景。文章概述了二氧化钛纳米空心球的制备方法,包括模板法、喷雾反应法、自组装法以及其他方法。     

Material properties of ZnS nanoparticles incorporated soy protein isolate biopolymeric film

ABSTRACT

Glycerol plasticised soy protein isolate (SPI) films at different contents (1 to 5% w/w w.r.t SPI) of zinc sulphide (ZnS) nanoparticles were fabricated. Before the film formation, the ZnS nanoparticles incorporated SPI suspensions were subjected to molecular mass studies by SDS-PAGE and specific conductivity studies. SPI films and ZnS nanoparticles incorporated SPI films were structurally and mechanically characterised by Fourier transform infrared spectroscopy (FT-IR) and mechanical properties, respectively. Transmittance and water uptake studies were also carried out for ZnS nanoparticles incorporated SPI films. The results from transmittance, water uptake and FT-IR studies indicated a good compatibility between the ZnS nanoparticles and the SPI. With the increase in the contents of ZnS nanoparticles from 0 to 4%, the tensile modulus increased from 87.4 to 99?MPa. The water uptake decreased significantly from 159 to 10.76%. However, the results showed the absence of antibacterial effect in ZnS nanoparticles incorporated SPI film.     

纳米TiO2陶瓷珠膜的制备及其光催化性能研究

以钛酸四丁酯为前驱体，采用溶胶-凝胶法，在低温或常温下通过溶液中发生水解、聚合等化学反应，生成溶胶，进而生成具有一定空间结构的凝胶，经过干燥、减压和热处理，制备出纳米TiO₂并在陶瓷珠载体上附着。研究了陶瓷珠负载TiO2对阳离子蓝的光催化降解性能。     

Preparation and photoelectrocatalytic properties of titania/carbon nanotube composite films

Composite films of TiO₂ and carbon nanotubes (CNTs) were prepared on titanium sheets by liquid phase deposition and the photoelectrocatalytic (PEC) properties of the films were investigated through the degradation of methyl orange (MO) in 0.1 M solutions. It was demonstrated that CNTs in the TiO₂ film significantly decreased the charge transfer resistance and increased the anodic photocurrent response of the film under UV light irradiation when the bias was above −0.1 V. The PEC performance of the CNT-based composite film could be tuned by controlling the preparation parameters including the deposition time and calcination temperature. The deposition time and calcination temperature were optimized at 1 h and 450 °C, respectively. On the TiO₂/CNT film prepared under the optimized conditions, 95% of the added MO (10 mg L⁻¹) was degraded within 90 min, which was much higher than the 60% removal seen on the pure TiO₂ films.     

Processing and properties of phthalic anhydride modified soy protein/glycerol plasticized soy protein composite films

Phthalic anhydride modified soy protein (PAS)/glycerol plasticized soy protein (GPS) composite films were fabricated by using extrusion and compression‐molding. Modified with phthalic anhydride, the soy protein lost its thermoplastic ability and was used as a filler to reinforce the GPS matrix. Fourier transform infrared spectra, optical transmittance, scanning electron microscope, mechanical tests, water resistance tests, as well as thermo‐gravimetric analysis were carried out to investigate the structure and properties of PAS and the plastic composites. The similar chemical structure of PAS and GPS led to compatibility of the two components resulting in high transparency and enhanced tensile properties of the composites. The water resistance of GPS was also improved by the incorporation of PAS. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42221.     

TiO2/SiO2复合薄膜的制备及其自清洁性能

利用热陈化法得到的纳米TiO2粒子及SiO2聚合物胶粒通过浸渍-提拉技术制备了具有自清洁功能的TiO2/SiO2复合薄膜。考察了SiO2的复合比例对薄膜的表面形貌、透光率、光致亲水及自清洁性能的影响。随着SiO2复合体积分数的增大,薄膜的表面粗糙度、可见光透过率、光致亲水及自清洁性能显示了相似的变化规律。即在V(SiO2)=25%左右时,薄膜的各项特性或性能达到最大值或最小值。该薄膜在室外放置28天后,仍能显示超亲水性能。     

Preparation and properties of hydroxyapatite/titania composite for microbial filtration application

Abstract

A series of TiO₂ modified hydroxyapatite composites (HA/TiO₂) with different compositions were prepared. Phase formations and morphologies of the obtained HA/TiO₂ composite were characterised using X-ray diffraction and SEM, and their photocatalytic activities were also determined by decomposition of methylene blue solution. Filter cloths were prepared by depositing the composite on polyester non-wovens via pad dry cure, and their filtering effectiveness was examined by photocatalytic activity measurement and bactericidal test. Hydroxyapatite/TiO₂ composites were successfully prepared and exhibited photocatalytic properties. With increasing ratio of anatase titania in the HA/TiO₂ composite from 20 to 30 and 50%, photocatalytic activity of composite material increased such that HATi5050 composite exhibited the highest photocatalytic activity. Non-woven filters coated with HA/TiO₂ composites also exhibited good photocatalytic activities. Less difference in photocatalytic activity between HATi7030 and HATi5050 coated non-woven filters was observed, compared to that in powder form. The filter coated with HA/TiO₂ composite exhibited good bactericidal effect.     

液相沉淀法制备纳米TiO2及其光催化性能的研究

提出了一种以TiSO₄为前驱体的制备锐钛矿型纳米TiO₂的液相沉淀法。通过控制适宜的制备条件，可将Ti^4+的初始浓度提高到15 mol·L^-1。以丙烯酰胺的光催化降解为模型反应，考察了所制备TiO₂的光催化活性。与萃取沉淀法制备的TiO₂和工业催化剂相比，该法制备的TiO₂不仅产率高，而且催化活性较好。     

核桃蛋白-低聚半乳糖复合纳米颗粒的制备及其Pickering乳液性质

以核桃蛋白（WalPI）和低聚半乳糖（GOS）为原料,采用pH循环-超声联合制备WalPI-GOS,并将其与茶油混合,制备Pickering乳液。通过FTIR、粒径分析表征WalPI-GOS的结构、粒径分布,通过荧光吸收光谱、DSC和内源荧光光谱等测定WalPI-GOS的游离巯基含量、热稳定性和表面疏水性（H0）,测定Pickering乳液的粒径、显微结构和流变特性,考察m(WalPI)∶m(GOS)在10∶0～10∶5变化时,WalPI-GOS颗粒特性及Pickering乳液性质的变化。结果表明,m(WalPI)∶m(GOS)＝10∶4时,WalPI-GOS和Pickering乳液具有最佳的性能。WalPI-GOS的平均粒径为82.08 nm,Zeta电位为-52.37 mV,乳化活性（EAI）、乳化稳定性（ESI）为31.12 m2/g和4346.35 min,表现出良好的乳化性和稳定性;WalPI部分疏水基团被包埋于WalPI-GOS分子内部,降低了H0（840.81 a.u.）,提高了游离巯基含量（8.78 μmol/g）和熔融温度（93.74 ℃）;WalPI与GOS的复合改变了WalPI的二级和三级结构,形成以β-折叠为主的二级结构,WalPI与GOS通过氢键、静电相互作用和疏水相互作用形成紧密的网络结构;Pickering乳液粒径仅为5.24 ?m,液滴均匀分布,形成了弹性凝胶网络结构;当剪切速率为0.1 s-1时,具有最高的表观黏度1.06 Pa·s。WalPI与GOS间的高交联密度,增强了Pickering乳液的凝胶网络结构。     

负载TiO2纤维布的制备及光催化性能的研究

采用涂膜法直接将非晶态纳米TiO₂胶体负载于纤维布上，制备了纳米TiO₂光催化剂。采用扫描电子显微镜(SEM)、比表面及孔径分析仪观察了催化剂的表面形貌和结构特征。以甲基橙溶液、气态苯胺为研究对象，考察了负载TiO₂纤维布的光催化活性。结果表明，负载于纤维布上的TiO₂为锐钛矿型，具有中孔结构，且有较好的光催化降解能力。纳米TiO₂光催化降解气态苯胺的中间产物主要有苯酚、苯醌、亚硝基苯和偶氮苯等。推断了其光催化降解历程。     

Antibacterial activity of photocatalytic electrospun titania nanofiber mats and solution-blown soy protein nanofiber mats decorated with silver nanoparticles

Highly porous photocatalytic titania nanoparticle decorated nanofibers were fabricated by electrospinning nylon 6 nanofibers onto flexible substrates and electrospraying TiO₂ nanoparticles onto them. Film morphology and crystalline phase were measured by SEM and XRD. The titania films showed excellent photokilling capabilities against E. coli colonies and photodegradation of methylene blue under moderately weak UV exposure (≤ 0.6 mW/cm² on a 15-cm illumination distance). In addition, solution blowing was used to form soy protein-containing nanofibers which were decorated with silver nanoparticles. These nanofibers demonstrated significant antibacterial activity against E. coli colonies without exposure to UV light. The nano-textured materials developed in this work can find economically viable applications in water purification technology and in biotechnology. The two methods of nanofiber production employed in this work differ in their rate with electrospinning being much slower than the solution blowing. The electrospun nanofiber mats are denser than the solution-blown ones due to a smaller inter-fiber pore size. The antibacterial activity of the two materials produced (electrospun titania nanoparticle decorated nanofibers and silver-nanoparticle-decorated solution-blown nanofibers) are complimentary, as the materials can be effective with and without UV light, respectively.