Advanced Materials Research Vols. 641-642

Abstract: Nano-carbon materials were synthesized by decomposing acetylene at 400 °C using iron supported on alumina as catalyst. The catalysts contain about 0.3 and 5.2 wt% iron. The products were refluxed in concentrated HCl at 80°C for 36 h in order to remove the catalyst support. The samples were examined by transmission electron microscopy and X-ray diffraction. The results show that carbon onions surrounding Fe3C core were obtained using the catalyst containing 0.3 wt% iron and these carbon onions had a structure of stacked graphitic fragments, with diameters in the range 15-50 nm.

Abstract: Carbon spheres were synthesized by chemical vapor deposition using iron catalyst supported on aluminum hydroxide, in the presence of acetylene as the carbon source. The effects of catalyst on the diameters of carbon spheres were investigated in detail. The products were characterized by field-emission scanning electron microscopy, element analysis, high resolution transmission electron microscope. The results show that the carbon spheres, to some degree, can be controlled by the catalyst

Abstract: The reactions were carried out by decomposing acetylene at 700 °C in a two-stage furnace system under different conditions. In the two furnaces, an AAO template with the average diameter about 50 nm was placed respectivly, whose temperature was designed to be 700 °C. The samples were characterized by scanning electron microscopy and high resolution transmission electron microscopy. The results show that when the reaction was carried out in C2H2-Ar atmosphere, dense and entangled CNTs with diameter, ca. 50 nm were obtained on the top surface of the AAO template in the first furnace and dense and entangled CNTs with morphology of rope were obtained on the top surface of the AAO template in the second furnace. When the reaction was carried out in C2H2- H2-Ar atmosphere, dense and entangled CNTs with diameter, ca. 50 nm were obtained on the top surface of the AAO template in the first furnace, however only a few CNTs were obtained in the second furnace. When the reaction was carried out in C2H2- H2 atmosphere, CNTs were both observed stood on the top of AAO template in the two furnaces

Abstract: In this paper, molecularly imprinted polymers with high selectivity for nonylphenol (NP) were synthesized by sol-gel process using 4-vinylpyridine (4-Vpy) as functional monomer, ethyleneglycol dimethacrylate as crosslinker (EGDMA), azobisisobutyronitrile (AIBN) as initiator, NP as template molecules. The performance of imprinted material was evaluated by adsorption kinetic, adsorption isotherm and adsorption selectivity. The results indicated that this material had not only binding properties but also high selectivity to the template molecule, which had good application prospects in the selective enrichment and separation of NP for pretreatment and analysis of complex environmental samples.

Abstract: According to the ore nature of limonite in Xinjiang，use the technological process of one stage selectrifine high magnetic separation—reverse flotation to the limonite. the result show that at the fineness ore of -200order 60.0%, employ the closed-circuit process ,Limonite concentrates aining above 52.24％ Fe could be obtained at a productive rate of 54.04％ and a recovery of Fe about 67.03％ losed circuit tests, and the numble of finally tailing is 47.76%,29.08%and 32.97%.

Abstract: This paper presents the synthesis of 2-ethoxy-4-nitrophenol using three types of nitrification synthesis schemes with 2-ethoxyphenol as main reactant. The comparison of the reaction conditions, reaction time, the quantity of the reaction byproducts, yield and post-treatment of the reaction product among these three synthesis schemes is made. It concludes that Ferric nitrate is the optimal catalyst for nitrification. Finally, melting point test and infrared characterization were conducted for the products. It shows that the product contains 2-ethoxy-4-nitrophenol and the yield is 55.48%.

Abstract: Suitable additives are the essential parts of 5% toltrazuril suspension concentrate. This paper mainly focused on screening additives for preparing 5% toltrazuril suspension concentrate. Results show that xanthan gum is a suitable suspending agent, 1,2-propanediol is optimal wetting agent, and citric acid act excellently as flocculant.

Abstract: With the sinter waste heat as driving heat source, the experiment table of absorption heat pump combined waste heat and ground source was build. Experimental study is conducted with the process of stable and variable condition, and operating characteristics in different conditions were obtained. The system operating results provide reference for energy use patterns of heat pump combined waste heat and ground source.

Abstract: Laboratory evaluation showed that rhamnolipid combined displacement system with low and wide effective concentration (0.125%~1.0%) can reduce interfacial tension with Pubei oil and water to 10-2mN/m. Injection of 0.5PV of rhamnolipid combined displacement system in natural core simulating reservoir permeability can increase recovery by 7.9%~9.3% more than water flooding. Field test for rhamnolipid combined displacement system was carried out with 2 injectors and 9 producers. Alternating injection is performed with two slugs with total volume of 19895.5m3, containing 250.9t of dosage. During 13 months of field test, stageous cumulative incremental oil production was 2014t, with 224t of average single well incremental oil. Daily oil production increased from 1.5t/d to 1.85t/d, average water cut decreased by1.5%, and input-output ratio was 1:2.4. This study provided a new way to improve oil recovery for other similar water flooded reservoirs.

Abstract: Wool, a natural keratin fiber, and polylactic acid (PLA), a so-called biodegradable man-made fiber, were assessed on their biodegradability under natural soil and aqueous medium conditions. Cotton, a natural cellulose fiber, was used as positive control. The biodegradation of the three samples were evaluated at 35°C for 42days by the time-dependent changes in weight loss, strength loss and morphology in both conditions. The experimental results indicate that biodegradation activities in natural soil was more efficient and faster than that in aqueous medium; The order of their degradation rates are: cotton>wool>PLA fiber, that implies the natural fibers are more easily degradable than man-made biodegradable PLA fiber; and the mechanical properties decreased faster than biodegradation rate.