Advanced Materials Research Vols. 148-149

Abstract: The water disinfection efficiency of Fe3+ and N-doped 3SnO2/TiO2 composite and undoped films was investigated. The water containing E. coli with an initial concentration of 103 CFU/ml was treated by a photocatalytic reactor filled with 60 g of glass fibers coated with the catalytic films for 1-5 circulated cycles. The number of survival bacteria after treatment was evaluated with spread plate techniques. Furthermore, the photocatalytic reaction on degradation of methylene blue dye solution was also investigated in order to observe the correlation between the result of bacteria inactivation of the prepared films and that of photocatalytic activity on methylene blue degradation. It reveals that N-doping in the TiO2 composite films results in shifting absorption wavelength towards visible light, narrowing the energy band gap and acts as photo-generated electrons trapping site, leading to retardation of the electrons-holes recombination, while Fe3+ doping has a main effect on hindrance of anatase crystal growth of the composite films. Therefore, 20N/3SnO2/TiO2 composite thin film exhibits greater photocatalytic activity and disinfection efficiency than those of undoped and Fe3+ doped TiO2 films. It was found that the bacterial inactivation of the prepared films correlates closely to photocatalytic activity performed by degradation of methylene blue dye solution. The 20N/3SnO2/TiO2 composite film can kill E. coli 97% within 5 cycled water treatment (~93 min) while Fe3+/3SnO2/TiO2, undoped TiO2 and UV alone can kill only 62, 65 and 58%, respectively. The 20N/3SnO2/TiO2 films coated on glass fibers are expect to be applied as an antibacterial photocatalyst for water purification.

Abstract: A novel coordinated nano-material containing vanadium with regular helical chains has been prepared via a hydrothermal procedure by using 2,3-Diaminephenazine (2,3-DAP) and vanadium pentoxide (V2O5) as starting materials without the aid of any surfactants and templates. Then the products of V2O5 nanohelix complexes were characterized by using XRD, SEM, FT-IR, NMR, and TEM. Furthermore, the electrochemical property of the V2O5 nanohelixes was determined by the voltammetric technique.

Abstract: Mercury is a toxic air pollution, and coal-fired utility plants are the largest anthropogenic emission source in China. Due to rapidly decreasing the cost and increasing the efficiency, it is becoming necessary to develop alternative technologies/materials for mercury removal. The adsorbents made from fly ash of coal-fired, and became spherical after sintering at temperature 500 . Finally, it has been treated by thermal precipitation sulfur, to remove mercury in fuel gas of coal-fired. High temperature deposition furnace was applied to increase sulfur content in fly ash based adsorbents produced in lab. SEM, BET, TGA and other measurement methods were used to characterize the surface morphology, sulfur distribution and specific surface. The experiments can increase its sulfur content of adsorbent, and the study found that sulfur attached to the surface, mesopore structure, microporous structure of fly ash-based adsorbents. So these treatments can increase their surface area and enhanced their adsorption capacity, while the sulfur was filled in interspace as small molecule S2 and S5. And the specific surface area increased by sulfur-loading and increasing temperature.

Abstract: The microwave is the electromagnetic radiation with the frequency in the between 300 MHz~300GHz. The microwave technology in metallurgy application research are mainly in heating, drying, oxide reduction, mineral processing such as the pretreatment of refractory gold and waste treatment, and metal recovery. The stone coal vanadium ore grinded was dealt with the microwave pretreatment in this article, in order to study the effect of factors such as the heating-up characteristics and weightlessness rate of this ore, and then the ore by pretreatment was carried on the leaching experiments, compared with the vanadium mine with no microwave pretreatment, the results was shown that every different microwave pretreatment way were able to improve leaching rate. The ore pretreated by microwave with heating 5 minutes, the leaching rate was improved almost 13% compared with the routine leaching. If the time for no treatment was increased, the stone coal vanadium ore had been already sintered, instead, reducing the leaching rate.

Abstract: A new kind of composite flocculant, polyaluminum ferric chloride (PAFC), was prepared using blast furnace dust and scrap material of aluminum. Tests about its application on the treatment of brewing wastewater were carried out and the flocculation mechanism was discussed. Results showed that the best condition for foluccation was: doses of PAFC was 40 mg/L, pH of wastewater was about 7.0, sedimentation time was 30 min, removal rate of turbidity, CODcr, decolorization and ammonia were 96.8%、64.7%、87.5% and 41.0% respectively.

Abstract: Smart Home technology promises enormous possibilities to our future life. It contains internal network, intelligent control and home automation. The paper describes a novel architecture for the smart home system employing ZigBee technology. Energy conservation is also a feature of smart home system. Based on the time-of-use (TOU) pricing, a new energy saving solution has been proposed.

Abstract: Reverse micro emulsion method showed some advantages in the preparation of the catalyst MnBaAl11O19-δ with large surface area and high activity, when compared with sol-gel method or co-precipitation method. The influences of water content in reverse micro emulsion on nanostructure catalyst MnBaAl11O19-δ were discussed in this paper. The catalyst MnBaAl11O19-δ was prepared by reverse microemulsion method with a system consisted of 55% of n-heptane, 15% of emulsifier OP-10, 15% of 1-octanol and 15% of water (volume ratio). It resulted in the catalyst a length of 10-30nm plated-like phase and large surface area of 106 m2/g. The catalyst was applied in dimethyl ether combustion and it showed high activity with T10% at 160 °C and T90% at 300 °C. The recycle reverse micro emulsion was reused to prepare the catalyst MnBaAl11O19-δ. The catalyst MnBaAl11O19-δ prepared with that, still showed large surface area of 65m2/g and high activity with T10% at 170 °C and T90% at 320 °C in dimethyl ether catalytic combustion.

Abstract: The Bi1.5ZnNb1.5O7 ( -BZN) ceramics were prepared by combining conventional solid synthesis (CS) and hydrothermal method (HTM). The emphasis was placed on the effects of doping nanopowder synthesized by HTM on the properties of -BZN ceramics. The results show that there is no effect of doping nanopowder on the sintering temperature and phase of -BZN ceramics. Therefore, with the increase of doping nanopowder, the density of ceramics decreases. Doped 10 wt% nanopowder, the ceramic sample sintered at 1000°C exhibits a well-crystalline phase and more excellent dielectric properties than others. At 1MHz, the observed value is about 148 and tan value is less than 3.365×10-4.

Abstract: F-doped TiO2 catalysts were obtained by sol process，in which tetrabutyl titanate was used as precursor and hydrofluoric acid as iondonors. The photodegradation experimental results showed that photoeatalytic activity of the F-doped catalyst is higher than that of the un-doped ones，the F-doped catalyst with 1:4(F:Ti molar ratio) fluorine at 40 was the highest catalytic efficiency under simulant sun's rays irradiation. The doped catalysts in anatase phase own higher photocatalysis characterized by XRD and BET. Effects of properties on the F-doped TiO2 catalysts were developed.

Abstract: A graphene oxide/polyaniline composite was synthesized by an in situ polymerization process. This product was simply prepared in an ethylene glycol medium, using ammonium persulfate as oxidant in ice bath. The composite was characterized by field emission scanning electron microscopy, transmission electron microscopy, X-Ray photoelectron spectroscopy, Raman spectroscopy and electrochemical test. The composite material showed a good electrochemical performance.