Advanced Materials Research Vols. 183-185

Abstract: Titania powders were prepared under hydrothermal conditions by employing organic molecule β-cyclodextrin(CD) as template, and characterized by means of TGA、XRD、BET . The effects of the pH on the specific surface area and photocatalytic performance of titania were discussed. The results showed that titania powders were anatase structure;the titania powders with specific surface area up to 216.2 m2g-1 were prepared while the system pH was about 1 , and the powders had the best photocatalytic activity.

Abstract: TiO2 photocatalyst modified by N and Fe ions was loaded on self-made fly ash forming adsorbent (FFA) using the sol-gel dip-coating process. The crystal structure and photoadsorption ability was characterized by X-ray diffraction (XRD) and UV-Vis spectrophotometer, respectively. The photo catalytic degradation of Reactive Brilliant Blue KN-R using N, Fe-TiO2/FFA was examined. Effects of initial dye concentration, pH value and hydrogen peroxide dosage on degradation were studied. The degradation of the organic molecule followed a pseudo-first-order kinetics according to the Langmuir model. Under the optimum operation conditions, 30 mg/L KN-R could be decolorized over 97.47% within 75 min.

Abstract: Resveratrol was extracted from wild blueberry (Vaccinium uliginosum L) and purified. Ethanol was selected as the optimal extraction reagent. Ratio of materials to the reagent, extraction time and temperature had significant effects on the extraction percentage. Optimization extraction conditions were obtained by 2 order regression orthogonal experiment, the conditions were as follows, extraction temperature 35°C, ratio of materials to ethonal 1:15, extraction time 2h, extraction for only once, extraction rate was about 88%.

Abstract: Nitrogen doped TiO2 Photocatalysts was prepared by ultrasonic dispersion method based on the predominated materials as tetrabutyl titanate with the dopant of saturated Urea solution. The dynamic behavior of nitrogen doped TiO2 for the degradation of rhodamine B was researched on the catalyst volume and the effects of pH value on photocatalysis ratio. Results showed that the catalytic reaction was accord with the first class reaction dynamic model. When the catalyst was 0.1g and the pH value close to 7, the degradation ratio was the maximum.

Abstract: Astronautical mutagenesis is a new breeding technique. In space, the variation are produced by means of the comprehensive effect like high vacuum, microgravity, intense radiation and so on. The mutated seeds by astronautical mutagenesis will be selected to breed the new cultivars. Astronautical mutation breeding opens up a new way for breeding. In this study, the genetic variation of 10 “Zhaodong” Alfalfa mutated lines produced by astronautical mutagenesis were investigated using RAPD method. For RAPD analysis, 90 primers were tested and 21 primers were selected for the detailed RAPD makers. Comparing with the original “Zhaodong” Alfalfa, the genetic variation of mutated lines was very obvious. For the same Primer, there were more one band (a few bands) or less one band (a few bands) between mutant and its original lines. The amplified bands and polymorphic sites were rich, ranging from 250-2000bp.1108 RAPD loci were determined. The quantity of RAPD polymorphic loci ranged from 2-31. The rate of polymorphic sites of the mutants and wild types ranged from 2.06%-31.95%. The mutated line-8, 9, 10 had bigger variation and mutated line-10 has the biggest variation in all mutants, it can be for the further selection and breeding work for the new alfalfa.

Abstract: In this paper, Chinese larch bark and different areas of Korean larch bark chemical composition and quantitative analysis of active ingredients, and with several plant resources in the total flavonoids were compared and evaluated. The results showed that: Korean larch bark of ash content (1.34%) lower, phenethyl alcohol extract (16.17%), proanthocyanidins (3.84%), total flavonoids(16.59%) and dihydro-quercetin (4.87% ) the highest. The total flavonoid content is more higher than the development of herbal extracts of total flavonoids. Therefore, the bark is a great potential for development of renewable resources.

Abstract: To optimize the sulfated modification conditions of Undaria pinnatifida polysaccharides (UPPSⅠB). UPPSⅠB was modified by chlorosulfonic acid-pyridine method. L9(34) orthogonal test was used to optimize the reaction temperature, reagent ratio and reaction time with the degree of sulfate group and carbohydrate content as index. The major factor was reaction temperature. The optimal modification conditions were that the reaction temperature was 60°C, the ratio of chlorosulfonic acid to pyridine was 1:2, and the reaction time was 1.5h. The sulfated UPPSⅠB could be obtained using the optimal modification conditions.

Abstract: Versatate-fluorocarbon emulsion with core-shell structure was synthesized by seeded emulsion polymerization using versatate, organic fluorine and acrylate as raw materials. The influences of amount of organic fluorine and versatate, core-shell ratio on the properties of emulsion were discussed. The emulsion was characterized with contact angle analyzer, particle size, transmission electron microscopy (TEM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The results showed that the emulsion had good properties while w(organic fluorine)=6%, w(versatate)=8%, soft core-hard shell and w(core):w(shell)=3:2. The particle size is 110nm and with core-shell structure. The contact angle of emulsion film to water is 98.1º. The synergistic effect of versatate and fluorocarbon based on core-shell structure improve the over-all properties effectively.

Abstract: Hierarchical mesoporous Phosphor-doped titania nanoparticles were synthesized by two different method, that is roasting method and hydrothermal method. The samples prepared by hydrothermal method has much higher photocatalytic activity. In addition, MB degradation performance of the hydrothermal ones is also superior to that of the commercial P25. Therefore, the methylene blue (MB) degradation performance on the phosphorous-doped photocatalyst is much enhanced and superior to that of the commercial P25. The hydrothermal method proves to be very suitable for the synthesis of P-doped titania photocatalyst. The resulting materials were characterized by X-ray diffraction (XRD), nitrogen physical adsorption at 77 K, X-ray photoelectron spectroscopy (XPS), and solar light spectroscopy.

Abstract: Dialdehyde oxycellulose-coated magnetite nanoparticles were prepared as carrier to immobilize the lactase, the preparation conditions and enzymatic properties of the immobilized enzyme were studied. The results showed that the maximum activity of immobilized enzyme is 0.424U/g when immobilized time is 4h, immobilized pH is 6.5, [enzyme]/[carrier] =1:15(g:g). Compared with free enzyme, the heat stability and basic resistance of immobilized lactase were increased. After reuse five times, the relative enzyme activity of immobilized enzyme was 63%.