Advanced Materials Research Vols. 393-395

Abstract: Magnetic coal-based activated carbon was prepared from Taixi anthracitic coal in the presence of magnetite (Fe₃O₄). The magnetic activated carbon samples were characterized by N2 adsorption, XRD, FTIR and vibrating sample magnetometer (VSM). It was found that the magnetic activated carbon had a high surface area of 993.5 m²/g with 4% Fe₃O₄ and a saturation magnetization of 2.4158 emu/g for magnetic separability. The results showed that the magnetic properties of MAC are provided by Fe₃O₄ and Fe. In the presence of Fe₃O₄, the rate of carbonization and activation increase to form a large surface area and a high pore volume. Moreover, the addition of Fe₃O₄ can greatly promote the number of both micro-pores and meso-pores in activated carbon.

Abstract: A kind of 1,8-naphthalimide derivative grafted onto Chitosan was synthesized with Chitosan, 4-bromo-N-(2-aminoethyl)-1,8-naphthalimide and 4-bromo-1,8- naphthalic anhydride via substitution and amidation. The structures of compounds was characterized by FT-IR．Thermal stability and fluorescence spectra of the target product were investigated. Compared with 4-bromo-N-(2-aminoethyl)-1,8-naphthalimide, the maximum fluorescent intensity of the 1,8-naphthalimide derivative grafted onto Chitosan was increased 1.25 folds.

Abstract: Both poly(L-lactide) (PLLA) and poly(ethylene succinate) (PES) are biodegradable synthetic aliphatic polyesters with excellent biocompatibility. They are semicrystalline thermoplastic polymers processed by most conventional processing methods. In view of their complementary properties, blending PLLA with PES becomes a promising approach to improve the properties of PLLA without compromising its biodegradability. In the present work, fully biodegradable PLLA/PES blend(the weight ratio 90/10) was melt-blended in stainless steel chamber. The crystallization morphology was investigated using a polarized optical microscope (POM), showing more clear spherulites with typical crosslink extinction patterns and faster crystallization rate of PLLA in blend at the lower heating rate. It clearly showed that the addition of PES largely increased the crystallization rate of PLLA and improved the crystallinity of PLLA in blends.

Abstract: Nitrogen-doped TiO2 (N-TiO2) film photo catalyst loaded on slide glass was prepared considering ammonia (NH3) as nitrogen sources by sol-gel method. X-ray diffraction and SEM were employed to characterize the morphology, structure of the N-TiO2 photocatalyst. The chemical oxygen demand (COD) with N-TiO2 film photocatalyst experiment by degrading pesticide phoxim in aqueous solution under UV light by a self-design circulating photoreactor indicated that the degradation efficiency of N-TiO2 film photo catalyst was depended on the layer numbers, flow velocity of solution and the category of light sources. The influence factors of preparation conditions were optimized. The optimum degradation efficiencies of COD decreased to 56.3 mg/L by using N-TiO2 film photo catalyst in 60 min reaction period. In addition, the N-TiO2 film photo catalyst has better photocatalytic activity under sunlight irradiation.

Abstract: Objective: Peppermint oil sustained microcapsules were prepared by intra-liquid desiccation. Methods: The orthogonal design methods were used to get the optimal prescription by uesing ethyl cellulose as materials and sodium dodecyl sulfate as emlsifier. Results: The best prescription of peppermint oil sustained microcapsules were as follows: 0.1mL peppermint oil, ethyl cellulose : drug was 10:1, sodium dodecyl sulfate was 0.11 g, ethyl acetate was 16 mL, distilled water was 260 mL. Conclusion: The method was simple and easy to be controlled, reproducibility was good.

Abstract: Based on the concept of “waste control by waste”, a kind of inorganic polymeric flocculants which was called Polysilicate Aluminium Ferric (PSFA) was made from bentonite, wastewater containing Al3+, wastewater containing Fe3+ and sulfuric acid under normal temperature conditions, and it was adopted to treat banknote printing wastewater. The experiment results revealed that the maximal Chemical Oxygen Demand (COD) removal efficiency of 95.52% with residual COD of 3571mg/L and color removal efficiency of 96% with residual color of 40 times could be achieved at the optimal dosage of 48g/L wastewater, a number of big and dense alum flocs appeared quite fast, the flocs and water could be obviously separated in a short time, the pH of coagulating effluent of which color was light green was about 4.01, the effects of coagulation were very well.

Abstract: The heterogeneous beta-supported transition metal catalysts were prepared by incipient wetness impregnation. The catalytic oxidation degradation of methyl orange was carried over the heterogeneous catalyst in the peroxide catalytic oxidation process. The pure beta materials showed quick adsorption equilibrium characterization, and the adsorption ratio was only 30%. Compared with the adsorption of the pure beta carrier, the Cu/beta and Fe/beta catalyst could effectively degrade methyl orange with high catalytic activity and easy catalyst separation from the solution using hydrogen peroxide as oxide. The methyl orange removal efficiency could reach 99% in the optimum experimental conditions. The optimal mental content for Cu, Ag, Mn, Fe and Co was 5%, 8%, 0.3%, 1% and 0.3%, respectively.

Abstract: Carbon dioxide is one of the most important greenhouse gases which have caused the global warm. Reducing greenhouse gases, especially carbon dioxide emission, has become the hot spot of environmental issues in the current society of international world. Based on the analysis of carbon dioxide emissions in the global environment and the present introduction of carbon tax as a tool for reducing carbon dioxide emissions, the paper, on a unique perspective, compared some related conceptions in deep and analyzed the principle of the means in reducing carbon dioxide from the perspective of macro and micro. Finally, the paper gave the conclusion of China's carbon tax in the current implementation of specific measures.

Abstract: Explosive emulsion was applied dynamic pressure using by underwater explosion test apparatus，and its pressure desensitization degree was calculated. The crystallization quantity was measured by water dissolution method after emulsion explosive was pressed, and the relationship of crystallization quantity of emulsion explosive and desensitization degree was analyzed. Experimental results show that the crystallization quantity increases with dynamic pressure rising, and the desensitization degree increases, too. The crystallization quantity is relation to the type of sensitizing agent, the crystallization quantity of emulsion explosive sensitized by GMB is less than that of expanded perlite.

Abstract: The adsorption behavior of Reactive Blue (RB2) dye from aqueous solution on chitosan/diatomite biocomposite adsorbent was studied. The effects of biocomposite adsorbent ratio and pH on removal of RB2 were examined, and optimum experimental conditions were identified. Biocomposite adsorbent had the largest adsorption efficiency when the ratio was 10 wt%. The maximum percentage removal of RB2 was 96.36% which obtained at pH 4.0. Adsorption equilibrium showed adsorption amount of RB2 improved with increase in the amount of NaCl, indicating that the addition of inorganic salt was an advantage of the removal of RB2.