Advanced Materials Research Vols. 881-883

Abstract: In this study, 23 endophytic fungus were isolated from Anemone tomentosa. The antibacterial activity of the endophytic fungi were tested and analyzed by filter paper method. The results showed that the endophytic fungi from Anemone tomentosa had broad antibiogram and strong inhibited Gram-positive bacteria and Gram-negative bacteria, especially the mycelia extract of root-1, the ethyl acetate and the n-BuOH extracts of root-8. So the endophytic fungi from Anemone tomentosa could be an important resource for developing antimicrobial products.

Abstract: 20 strains of endophytic fungi were isolated from roots and stems of Ephedra intermedia. After fermentation these strains, fermentation broth and mycelium were extracted by ethyl acetate, n-butanol and methyl alcohol, producing 60 extracts. Then the antibacterial activity of these extracts was researched, the result found that 33 extracted samples could evidently inhibit the growth of six different bacteria, accounted for 55%. The MIC of ethyl acetate extract of J109 was 0.15625mg/mL to five test bacterial expect Streptococcus uberi.

Abstract: This paper described a spectrophotometric method for simultaneous determination of two drugs,Vitamin C, aminophylline with the aid of partial least squares. The proposed method was successfully applied to overcome the overlapping of their absorption curves in the UV spectral region.The result was shown that the predictive errors obtained by the PLS method was 9.25%. Recovery of the method by standard addition method was respectively valued 92.43% (for vitamin C) and 102.53% (for aminophylline).

Abstract: Nowadays, there exist a few standardized tests in poor soluble substances ready biodegradability measurement. There are possibilities in evaluate the degradation by the O₂ consumption or by CO₂ releasing. Tests for O₂ consumption are very stringent in keep the constant temperature because of the pressure which is the main parameter in O₂ consumption calculating. On the other hand CO₂ releasing test are complicated and discontinue because of the measuring by the titration methods. In present there is a possibility to measure CO₂ produced by microbial activity during the substance degradation by the gaseous sensors. We were realized preliminary studies in continual measuring of evolved CO₂ in biodegradability test of metalworking fluid Syntilo 81 BF by the conductivity measurement of absorption solution of barium hydroxide as it was described in [3,5].

Abstract: In this paper, we initially report a new type of wax printing method for rapid fabrication of microfluidic devices in paper using a commercially available, cheap, minitype (home-use) CO₂ laser engraving machine. This method combines the two core operations commonly involved in all previous wax printing methods, namely the printing and heating (melting) of wax patterns into one operation of engraving home-made wax slice (put in contact with the surface of paper) by laser. The heat produced by the laser makes the wax being engraved melt and then spread into paper to form complete hydrophobic barriers which are used to define the hydrophilic flow channels or separate test microzones. Under the optimized experimental conditions, a typical device on a 3 cm × 3 cm piece of paper could be fabricated separately within ~320 sec and is ready for use once the engraving process is completed. The fabrication resolution and multiplexed analytical capability of the wax-patterned paper were additionally characterized.

Abstract: Virtual assembly was introduced in the chemical process simulation, and the method of virtual assembly for common chemical process was studied. The process of biomass fuel ethanol was analyzed which is combined by the first-grade distillation system in industrial ethanol production and the salt-added extractive distillation system in fuel ethanol production, and the scene graph structure was established. According to the assembly characteristics of the chemical process, the assembly equipment model was designed and constructed. The assembly points were added, and the assembly, simulation and transitive properties of the assembly points were defined. The 1+1and 1+n universality assembly method was proposed. By choosing unit equipment freely to assembly, the complex distillation system was realized. Results have shown that the assembly effect was good and accuracy, the method was proved correct and feasible. It is of great significance in the visual design of chemical process, digital construction of chemical plant and development of three-dimensional (3D) chemical process simulation technology.

Abstract: In this research, chrysotile nanotubes (ChNTs) were synthesized by the hydrothermal method. Synthetic ChNTs were characterized using XRD, SEM, TEM and N₂ adsorption-desorption. Adsorption technique was applied for removal of Sr (II) and Nd (III) from aqueous solution by using ChNTs. The process had been investigated as a function of pH and temperature. The experimental data were analyzed using equilibrium isotherm models. The adsorption isotherms are fitted well by Langmuir model, having a maximum adsorption capacities of 102.56 mg·g^-1 for Sr (II) and 47.44 mg·g^-1 for Nd (III) at 298 ± 1 K. FTIR and XPS techniques were employed to investigate possible adsorption mechanism.

Abstract: Chitosan quaternary ammonium salt is synthesized by means of heterogeneous reaction, and then applied to treat reactive dye waste water. Effects of flocculation factors on treatment waste water are discussed. The results show that, the quaternary ammonium salt of chitosan concentration and settling time have great effects on the flocculation effect, and the stirring manner has little effect on flocculation.

Abstract: There is abundant Cu²⁺ in plating wastewater containing chloride. Lix984, which is mainly applied in sulphate medium to extract Cu²⁺, was chosen as the extractant due to it has good performance. The influence parameters for extraction efficiency have been investigated. The results showed that Lix984 can successfully separate Cu²⁺ from simulating plating wastewater in chloride medium. And more, the maximal extraction efficiency is up to 93.3% for Cu²⁺ by single-stage extraction, and recover Cu²⁺ in hydrochloric acid medium by stripping, it can be obtained that stripping of copper >95.2%. These results can greatly broaden an application field of Lix984, especially in the field of acidic wastewater containing chloride and leaching solution with hydrochloric acid of mining process, in addition, it can provide help for the decreasing of environment pollution and recycling Cu²⁺.

Abstract: Impregnation method was used to prepare of graphene/TiO₂ composite. Its microstructure, phase and diffuse reflection properties were characterized by using of SEM, XRD and DRS. And the photocatalytic properties of graphene/TiO₂ composite changed with the reaction time, composite quantity added, X3B initial concentration and pH were investigated. The results show that the degradation degree of graphene/TiO₂ composite on X3B increases with reaction time increasing. Graphene/TiO₂ composite of GR3 has the best photocatalytic performance when the introduction of graphene was 0.4mg/g_(TiO2). Degradation efficiency of GR3 on X3B increases with the quantity of GR3 added to the solution increasing. And the photocatalytic efficiency is the highest when GR3 is 0.15g. With increasing of X3B initial concentration, the solution degradation rate is decreased. And it is beneficial for graphene/TiO₂ composite to play its photocatalytic properties in the weak alkaline conditions.