毕赤酵母提取液还原制备银纳米颗粒

采用毕赤酵母的提取液与银氨溶液反应制备银纳米颗粒(AgNPs),并考察了pH值对AgNPs的影响.结果表明:酸性条件下,反应速率缓慢,且生成的AgNPs呈多分散性;在一定范围内(pH值小于12.50),碱性条件有利于提高反应速率,且随着pH值的提高,AgNPs粒径分布变窄;当pH值继续提高(pH值为12.80),AgNPs发生团聚沉淀.     

Nanoarchitectonics of ZnO Nanoparticles Mediated by Extract of Tulbaghia violacea and Their Cytotoxicity Evaluation

Journal of Inorganic and Organometallic Polymers and Materials - The synthesis of nanoparticles (NPs) using plant extracts is an eco-friendly approach, which serves as an alternative method to the...     

PVP保护的CdS/Au复合纳米粒子的制备及其表征

以聚乙烯吡咯烷酮(PVP)为保护剂,利用化学还原法在无水乙醇中合成了CdS/Au复合纳米粒子,通过紫外可见(UV-vis)吸收光谱、透射电子显微镜(TEM)以及荧光光谱法对其进行表征。研究结果表明,将以PVP为保护剂制备的CdS/Au复合纳米粒子在80℃下回流3 h后,CdS/Au复合纳米粒子大小分布均匀。     

烟叶提取物合成酵母菌载纳米铁

以酵母菌为载体和分散剂,烟叶提取液为还原剂和稳定剂,原位还原FeSO_4合成酵母菌载纳米铁。以Cr(Ⅵ)去除为目标,考察提取溶剂、固液比、提取方式、提取时间以及烟叶提取液用量、亚铁盐与酵母菌质量比、合成反应时间对酵母菌载纳米铁去除Cr(Ⅵ)反应活性的影响。结果表明:固液比为1∶20(g∶mL)的烟叶乙醇提取液还原亚铁盐的能力最强,而室温振荡提取2 h与超声提取30 min的烟叶乙醇提取液还原性能相当;当亚铁盐与酵母菌质量比为1∶10时,加入烟叶乙醇提取液在室温下反应5 h合成的酵母菌载纳米铁最适于去除Cr(Ⅵ)。     

Ag/Co/Au三金属纳米粒子的合成及表征

反胶束是指由介于油和水界面的表面活性剂分子来稳定的,且均匀分散于连续油介质中的微液滴,由于微液滴的尺寸限制和其在油介质中的良好分散性,它可以作为"微反应器"合成纳米材料。以AOT为阴离子表面活性剂,采用反胶束法合成了Ag/Co/Au纳米粒子。采用紫外-可见(UV-Vis)吸收光谱、傅立叶红外光谱(FT-IR)对产物进行表征。研究结果表明,反胶束法合成Ag/Co/Au纳米粒子粒径均匀,分散性好、稳定性好。     

CdS/Au复合纳米粒子的制备与表征

以Cd(NO3)2.4H2O和Na2S.9H2O为原料,AOT为保护剂,利用反胶束法在正庚烷中合成了CdS/Au复合纳米粒子,加入适量的十二硫醇,利用静置法洗去保护剂AOT,通过加入不同量的无水乙醇改变分散介质的极性,改变CdS/Au复合纳米粒子在分散介质中的"溶解度",从而实现不同尺寸纳米粒子的分离。采用紫外-可见(UV-vis)吸收光谱,透射电子显微镜(TEM)、荧光光谱法等对其进行表征。     

Synthesis and Luminescence Properties of Core/Shell ZnS:Mn/ZnO Nanoparticles

In this paper the influence of ZnO shell thickness on the luminescence properties of Mn-doped ZnS nanoparticles is studied. Transmission electron microscopy (TEM) images showed that the average diameter of ZnS:Mn nanoparticles is around 14 nm. The formation of ZnO shells on the surface of ZnS:Mn nanoparticles was confirmed by X-ray diffraction (XRD) patterns, high-resolution TEM (HRTEM) images, and X-ray photoelectron spectroscopy (XPS) measurements. A strong increase followed by a gradual decline was observed in the room temperature photoluminescence (PL) spectra with the thickening of the ZnO shell. The photoluminescence excitation (PLE) spectra exhibited a blue shift in ZnO-coated ZnS:Mn nanoparticles compared with the uncoated ones. It is shown that the PL enhancement and the blue shift of optimum excitation wavelength are led by the ZnO-induced surface passivation and compressive stress on the ZnS:Mn cores.     

纳米ZnO的制备及其光催化性能研究

本文以羟丙基纤维素（HPC）作为分散剂,运用沉淀法制备出了粒径均匀的ZnO颗粒.通过透射电子显微镜（TEM）,X射线衍射（XRD）,紫外可见光吸收光谱,光致发光谱（PL）对ZnO进行了性能表征,并探讨了其形成机理及制备中的影响因素.利用纳米ZnO作为光催化剂对有机染料罗丹明B进行了光降解实验,实验结果表明,此方法制备的ZnO具有良好的光催化性能,有望在治理环境污染等领域具有良好的应用.     

柠檬酸盐保护下光化学一步法合成Au核-Pt壳纳米粒子及其表征研究

柠檬酸钠做保护剂,光化学同时还原Au(Ⅲ)与Pt(Ⅳ)离子混合物合成Au核Pt壳纳米粒子。应用XPS、UV-V is、TEM等分析手段研究了Au-Pt纳米粒子的结构、形貌、化学状态等。结果表明:所合成的双金属纳米粒子为球形,具有Au核-Pt壳复合结构,平均粒径范围为8.1~5.1 nm。     

Green Synthesis of ZnO Nanoparticles and Its Application in the Degradation of Some Dyes

A novel ZnO photocatalyst was synthesized by a green method using lemon juice and zinc acetate as precursors, and then the effect of sucrose addition on the initial precursors was investigated. The samples were characterized by field‐emission scanning electron microscopy, X‐ray diffraction, Fourier transform infrared, UV‐visible, and photoluminescence analysis. The result showed that the as‐obtained products with the mix of lemon juice (30 mL) and sucrose had a spherical morphology with the mean particle size of about 21.5 nm. The photocatalytic activity of this sample was tested for the degradation of methyl orange, methyl red and methylene blue solutions. The results also revealed the good photocatalytic activity for the degradation of these three organic dyes. Furthermore, as‐synthesized sample was used in decolorization processes and the treatment of textile dyes (reactive blue 21).     

氧化石墨烯负载金纳米颗粒及其催化活性研究

在不外加任何还原剂的情况下,利用氯金酸和氧化石墨烯之间的氧化还原反应将金纳米颗粒成功负载到氧化石墨烯上,合成了金纳米颗粒/氧化石墨烯复合材料。利用透射电镜(TEM)和X-射线衍射(XRD)对复合材料进行了结构表征与形态分析,并研究了金纳米颗粒/氧化石墨烯复合材料对Suzuki-Miyaura偶联反应的催化效果。结果表明,通过调节氯金酸与氧化石墨烯的质量比,可以得到不同形状的金纳米颗粒;金纳米颗粒/氧化石墨烯复合材料对Suzuki-Miyaura偶联反应具有很高的催化活性,并且很容易从反应体系中回收。     

Synthesis of Silver Nanoparticles Using Syzygium malaccense Fruit Extract and Evaluation of Their Catalytic Activity and Antibacterial Properties

Journal of Inorganic and Organometallic Polymers and Materials - In this study, green synthesis of silver nanoparticles, an aqueous Syzygium malaccense fruit extract, was employed...     

Environmental Safety in Melting Glass Using Different Types of Fuel

Data on studying toxic emissions during container-glass melting based on various types of fuel are provided. It is demonstrated that emissions decrease when natural gas is used as the fuel.     

Synthesis and magnetic properties of Zr doped ZnO Nanoparticles

Zr doped ZnO nanoparticles are prepared by the sol-gel method with post-annealing. X-ray diffraction results show that all samples are the typical hexagonal wurtzite structure without any other new phase, as well as the Zr atoms have successfully entered into the ZnO lattices instead of forming other lattices. Magnetic measurements indicate that all the doping samples show room temperature ferromagnetism and the pure ZnO is paramagneism. The results of Raman and X-ray photoelectron spectroscopy indicate that there are a lot of oxygen vacancies in the samples by doping element of Zr. It is considered that the observed ferromagnetism is related to the doping induced oxygen vacancies.     

单分散、小粒径纳米ZnO的制备及其表面包覆

以ZnSO4·7H2O和NaOH为原料,采用微乳法制备了单分散、小粒径ZnO纳米颗粒,并用Na2SiO3水解生成的SiO2对其进行表面包覆改性.用IR(红外光谱)、XRD(X射线衍射)、UV-vis(紫外可见光谱)等表征手段对制得的颗粒进行了袁征.结果表明:ZnO表面存在Si-O-Zn键,显示了SiO2的很好的包覆.室...     

The oxidation and scrambling of CO with oxygen at room temperature on Au/ZnO

An FTIR and quadrupole mass study of CO adsorption and oxidation with¹⁶O₂ and¹⁸O₂ on Au/ZnO catalysts is presented. The experimental results indicate that: (i) CO is activated by gold in two molecular forms, a linear carbonyl species bonded at terrace Au sites and a carbonyl species bonded to Au peripheral sites; (ii) a band related to CO adsorbed on Au oxidized sites and a scrambling reaction between CO and¹⁸O₂ indicate that oxygen is also activated on gold sites. The oxygen adsorbed on gold is probably strongly basic, as is the oxygen adsorbed on silver and on copper, and it can easily oxidize CO to CO₂.     

Surface morphology and optical properties of porphyrin/Au and Au/porphyrin/Au systems

Porphyrin/Au and Au/porphyrin/Au systems were prepared by vacuum evaporation and vacuum sputtering onto glass substrate. The surface morphology of as-prepared systems and those subjected to annealing at 160°C was studied by optical microscopy, atomic force microscopy, and scanning electron microscopy techniques. Absorption and luminescence spectra of as-prepared and annealed samples were measured. Annealing leads to disintegration of the initially continuous gold layer and formation of gold nanoclusters. An amplification of Soret band magnitude was observed on the Au/meso-tetraphenyl porphyrin (TPP) system in comparison with mere TPP. Additional enhancement of luminescence was observed after the sample annealing. In the case of sandwich Au/porphyrin/Au structure, suppression of one of the two porphyrins’ luminescence maxima and sufficient enhancement of the second one were observed.     

用嗜热四膜虫模型研究铁系纳米材料对环境生物体的安全效应

采用嗜热四膜虫模型,探讨在水体富营养化治理中三种铁系纳米材料的环境安全效应。分别将纳米磁性氧化铁(Fe3O4)、纳米磁性氧化铁(Fe3O4)/沸石复合体,铁掺杂型纳米沸石材料作用于嗜热四膜虫生物模型,采用血球计数法观察不同铁系纳米材料对于嗜热四膜虫生长的抑制作用,并用热台偏光显微镜观察相应嗜热四膜虫形态变化。结果表明:(1)不同化学形态铁系纳米材料对于嗜热四膜虫生长抑制情况存在差异,其中纳米磁性氧化铁(Fe3O4)最为敏感;(2)嗜热四膜虫的生长抑制率同加入的铁系纳米材料固/液浓度比间(0.1g/L、0.5g/L和1.0g/L)存在明显正相关性。