Advanced Materials Research Vols. 284-286

Abstract: Ordered mesoporous carbons (BOMC) were prepared by doping boric acid using a hard-templating method, while a CMK-3 carbon (OMC) was also prepared for comparison. The capacitive performance of these two carbons was investigated in ionic liquid of EMImBF₄ and EMImTSFI. As demonstrated by the structure analysis, BOMC possesses almost same surface area and pore size as OMC, while the former carbon possesses higher content of oxygen-containing groups. In ionic liquid electrolyte, the carbons mainly show typical electric double layer capacitance, and the capacitance retention ratio and ion diffusion of electrolyte is determined to the surface chemical property. BOMC present visible pseudo-capacitance due to the oxygenated groups in hydrophilic EMImBF₄, while no visible pseudo-capacitive behavior was observed in hydrophobic EMImTSFI.

Abstract: The character of ilmenite was modified by pretreatment, the effect of pre-oxidation temperature and time on structure of ilmenite were investigated by X-ray diffraction(XRD) and Thermo-gravimetric/differential thermal analysis. The results indicated that new microcrystal rutile and FeTiO₃·Fe₂O₃ solid solution were appeared on the surface of mineral below 800°C, but evident rutile crystals and pseudobrookite Fe₂O₃·TiO₂ were appeared above 850°C with the structure of ilmenite disrupting simultaneously. The preoxidation time increased from 15min to 60min, evident microcrystal rutile and FeTiO₃·Fe₂O₃ solid solution were appeared by degrees without structure of ilmenite breaking.

Abstract: Effects of CDI on corrosion behavior of AA2024-T3 in 3% NaCl aqueous solution are investigated through electrochemical techniques. the results show that CDI could lead to negative shift of free potential, breakdown potential and protection potential of AA2024-T3 and enhance the sensitivity of AA2024-T3 to pitting. The electrochemical impedance spectrum results show that Rp decreased significantly under applied stress and Rp can be taken as the indicator to evaluate the effect of CDI. Different strain rate could influence the effect of CDI on corrosion behavior and effect of CDI exhibit more significantly under low strain rate.

Abstract: Several microporous carbons were prepared by a two-step method using zeolite HY as a template, and were used as CO₂ adsorbents. X-ray diffraction patterns present that the structure regularity of the zeolite has been well-replicated by the templated carbons. X-ray photoelectron spectroscopy confirms that the prepared carbons possess abundant nitrogen-containing groups due to the carbon deposition of acetonitrile. The prepared carbons show high CO₂ adsorption capacity due to its very high microporous surface area and abundant basic nitrogen-containing groups.

Abstract: Self-propagating High-temperature Synthesis (SHS) method was adopted to synthesize powder containing CaB₆, and the power was leaching by sulfuric acid. Effects of reaction atmosphere, magnesium addition, H₂SO₄ acidity and leaching temperature on the performances of CaB₆ powder was investigated, the microstructure of products were researched by SEM and XRD, the results show that the phases of products by SHS are CaB₆、Mg₃B₂O₆ and Ca₃B₂O₆, and high purity CaB₆ powders are obtained after the products by SHS was leaching by Sulfuric acid. The SHS conditions are the vacuum atmosphere and 30% excessive magnesium addition and the leaching conditions are 55% acidity of Sulfuric acid and 40°C leaching temperature, the perfect and uniform grain of CaB₆ powers are obtained at the above conditions.

Abstract: With L-glutamic acid as raw materials, N-carboxy-L-glutamic acid-benzyl-anhydride (BLG-NCA) was synthesized by triphosgene. With aniline as the initiator in the anhydrous dichloromethane, ring-opening polymerization of BLG-NCA was initiated, poly-l-glutamic acid benzyl ester was obtained. The amount of initiators, Molar ratio of monomer/initiators, reaction temperature and reaction time to the effect of poly-l-glutamic acid benzyl ester in the ring-opening polymerization of BLG-NCA were studied. Through infrared spectroscopy, gel permeation chromatography (GPC) analysis and characteristic viscosity method, polymerization product was characterized and analysized. Results showed that in dichloromethane, ring-opening polymerization of BLG-NCA could be initiated by aniline, which expands greater scope of the initiators of poly-l-glutamate to aromatic compounds, and the introduction of the active group provided by aromatic compounds make it possible for the advanced development of block copolymer with poly-l-glutamic acid as a basic unit.

Abstract: The electro–reduction of CeO₂ in eutectic CaCl₂–NaCl melt was studied by cyclic voltammetry and constant voltage electrolysis techniques. One cathodic current peak in the cyclic voltammogram was observed and supports a one–step electro–reduction mechanism of CeO₂. During different times of electrolysis at 800°Cof temperature and 3.0V of constant voltage, the products CeOCl and CeO₂ were observed by XRD and confirms the following electro–reduction sequence: CeO₂CeOCl.

Abstract: The alcoholic extract of the Apocynum venentum (AV) bark were purified by silica gel column chromatography. The isolated chemical constituents were identified by MS, NMR, IR spectra. The main chemicals isolated from AV bark were quercetin (1), kaempferol (2), isoquercitrin (3), luteolin (4), hyperoside(5), 7-hydroxy-6-methoxy-2H-1-benzopyran-2-one (6), b-sitosterol (7), stigmasterol (8), 3, 4-dihydroxy-benzoic acid methyl ester (9), 3, 5-dihydroxybenzaldehyde (10) and 3, 4-dihydroxy-benzoic acid (11). The compounds (1)～(6) and (8)～(11) were obtained from AV bark for the first time.

Abstract: Through the pyrolysis experiments of the building room’s common combustible materials in this paper, the weight loss curves were obtained and the kinetic parameters of these three substances - activation energy and pre factor were got on which based the thermal kinetics analysis. While the reaction properties of materials were obtained by the smoldering experiments with different heat flow on a certain degree，with the increase of the heat flow, the temperature and time curve offset to the left. This is also consistent with the result of pyrolysis experiment. To some extent, this will laid a theoretical foundation for the building interior materials handling fire.

Abstract: Vanadium was recovered by using technology of calcified roasting→alkali leaching→ion exchange→precipitating→deaminizing, the principles of this recovery process were described in detail. Through the experiments, the parameters of roasting, leaching and ion exchange were determined, a new operational, low-polluting method to recovery vanadium was formed. This method not only can overcame the disadvantage of traditional technology, such as long process, serious pollution, but also has advantages such as high recovery and high purity of vanadium. In this study, pure V₂O₅ products with national standard were obtained. The total recovery was up to 65% or more, which was higher than that of the sodium roasting methods.