A Mesoporous Сarbon Prepared by Сarbonizing Cu(II)–p-Phenylenediamine Polymer for the Adsorption of Methyl Orange from Water

Russian Journal of Physical Chemistry A - A new mesoporous carbon containing nitrogen and copper was prepared by carbonizing a polymer obtained by blending p-phenylenediamine, copper(II) sulfate,...     

四种黄酮类化合物与牛血清白蛋白相互作用的光谱分析

在人体生理pH条件下,利用紫外吸收光谱和荧光光谱研究了槲皮素(QUE)、大豆甙元(DAI)、4′,7-二甲氧基-3′-异黄酮磺酸钠(DISS)和3′-大豆甙元磺酸钠(DSS)四种黄酮类化合物与牛血清白蛋白(BSA)的相互作用,结合反应机理对其进行了初步探讨;并计算了结合位点数和结合常数.紫外吸收光谱分析结果表明,在pH=7.4条件下,黄酮类化合物中疏水性的苯环与BSA疏水腔中的氨基酸残基发生作用,从而导致药物分子的吸收峰红移,用Scatchard拟合法可求得DAI及DSS与BSA的结合常数.荧光光谱分析结果表明,BSA对DAI、DISS和DSS均有明显的敏化增强效应,计算得到的增强速率常数分别为1.39×1011,7.72×1011和1.93×1012L·s-1·mol-1,并可求得结合位点数和结合常数.     

Simulated Sunlight-Driven Degradation of Rhodamine B by Porous Peanut-Like TiO2/BiVO4 Composite

Porous peanut-like TiO₂/BiVO₄ composite nanostructures were synthesized via a template-free hydrothermal process with bismuth nitrate, ammonium metavanadate and anatase TiO₂ as raw materials. The crystal structures, morphologies, and optical properties of the as-prepared samples were characterized by X-ray powder diffraction, transmission electron microscope, scanning electron microscopy, X-ray photoelectron spectroscopy and UV–visible absorption spectra. Simulated sun-light induced photocatalytic degradation of Rhodamine B by porous peanut-like TiO₂/BiVO₄ nanostructures in the absence and presence of H₂O₂ has been investigated, and the results show these porous composite nanostructures with higher photocatalytic activity than pure BiVO₄ and anatase TiO₂. When TiO₂/BiVO₄ heterostructures were used as the photocatalysts under simulated sun-light irradiation, BiVO₄ could act as a sensitizer to absorb the visible light. Meanwhile, coupling different band-gap semiconductors of TiO₂ and BiVO₄, the compound facilitate separation of the photogenerated carriers under the internal field induced by the different electronic band structures of semiconductors.     

Li-N共掺ZnO纳米管的第一性原理研究

采用基于密度泛函理论的计算方法,系列的研究了锯齿型(9,0) ZnO单壁纳米管、Li,N分别掺杂以及Li-2N共掺杂的ZnO纳米管的能带结构、总体态密度、分波态密度.分析发现虽然Li原子单独掺杂不会对纳米管能带结构产生明显影响,但是Li-2N共掺杂比N单独掺杂ZnO纳米管的结构更加稳定,而且Li-2N共掺杂ZnO纳米管是p型简并半导体.     

Partial molar volumes of organic solutes in water. VIII. Nitrobenzene and nitrophenols at T=298 K to T=573 K and pressures up to 30 MPa

Density data for dilute aqueous solutions of nitrobenzene and three isomeric nitrophenols (2-, 3-, or 4-nitro-1-hydroxybenzene) are presented together with partial molar volumes at infinite dilution calculated from the experimental data. The measurements were performed at T=298.15 K up to either T=573.15 K (nitrobenzene, m-nitrophenol) or T=548.15 K (p-nitrophenol) or T=523.15 K (o-nitrophenol) and at either atmospheric pressure, or at pressures close to the saturated vapor pressure of water, and also at p=30 MPa. The data were obtained using a high-temperature high-pressure flow vibrating-tube densimeter for measurements at elevated pressures and a commercial vibrating-tube cell DMA 602HT for measurements at atmospheric pressure.     

Physically and chemically bound H2O in the α-C2S hydrate structure

In this paper, a fundamental practical unit, namely the wedge-shaped enclosure, is proposed as a novel and efficient latent heat storage unit for thermal energy storage. The enthalpy–porosity method that treats the solid and liquid zones as a single domain is employed. Effect of the mushy zone constant C on melting is analyzed and a suitable value is obtained by comparing the numerical results with experimental data in the literature. A series of simulations are conducted to analyze the transient melting coupled with natural convection as well as the heat transfer process. Fourteen units those have different length ratios between top and bottom of the enclosures are investigated and compared by the analysis of transient temperature fields, vertical velocity distributions, and evolution of the melting fronts. It is found that the length ratio n dramatically affects the full melting time and heat transfer intensity. An enclosure of n = 5.5, which has the shortest completion time and the highest heat transfer intensity, is determined as the optimal unit. Compared with the base geometry (n = 1), charging time of the optimal unit (n = 5.5) decreased by 32.8 %, while the heat transfer intensity increased by 45.7 %. This is a significant improvement in the field of latent heat storage.     

Study on the interaction between clarithromycin and bovine serum albumin in the imitated physiology solution

The interaction between clarithromycin (CAM) and bovine serum albumin (BSA) was investigated using linear-sweep voltammetry in pH 7.4 phosphate buffer solution where CAM caused two irreversible reduction waves P2 and P3 on mercury electrode. The study showed that the formation constant and formation ratio for the interaction between CAM and BSA were 1.51×1012 and 3:1 for P2,4.53×105 and 1:1 for P3, respectively. The ion strength enhanced the hydrophobic interaction between CAM and BSA.