Advanced Materials Research Vols. 415-417

Abstract: The hydrogen storage characteristics of Tetra Butyl Ammonium Bromide (abbr. TBAB) hydrates were studied in a high pressure gas hydrate experimental apparatus. The effects of temperature and pressure on hydrogen storage characteristics under the condition of constant volume were discussed. The results showed that lower reaction temperature or higher reaction pressure can cause to a rapid formation of hydrogen hydrate and a larger hydrogen storage density, Comparing with tetrahydrofuran (abbr. THF) hydrates under same temperature and pressure, TBAB hydrates have faster hydrogen storage rate and larger hydrogen storage density.

Abstract: Abstract. In order to investigate the optimal thickness of infiltration media in the Constructed Rapid Infiltration System, the artificial soil column is used to simulate the Constructed Rapid Infiltration System, and the COD_Cr, NH₃-N and TN concentrations of the effluent from all the sampling sites are monitored. The experimental results and analysis show that the thickness of infiltration media exerts a significant influence on the COD_Cr, NH₃-N and TN concentration and removal efficiency of the effluent; the COD_Cr, NH₃-N and TN are mainly removed in the 0-1800mm zone of the artificial soil column; the total CODCr removal efficiency increases, as the thickness of infiltration media increases, but the CODCr removal efficiency in the 1800-2200mm zone is very low; the NH₃-N and TN removal efficiency reaches the maximum where the thickness of infiltration media is 1800mm; the NH₃-N and TN concentration of the effluent from 1800-2200mm zone dose not decrease, but increase 5-8%, due to the assimilation denitrification and amemoniation reaction on the end of the anaerobic zone; in consideration of the effluent quality, efficient biodegradation zone, construction investment, etc. the optimal thickness of infiltration media in CRI system should be 1800mm.

Abstract: The Mg₂Ni-type Mg₂₀Ni_10-xCu_x (x = 0, 1, 2, 3, 4) hydrogen storage alloys were prepared by a melt-spinning technology. The structures of the as-cast and spun alloys are characterized by XRD, SEM and TEM. The gaseous hydrogen absorption and desorption kinetics of the alloys were measured by an automatically controlled Sieverts apparatus. The results show that all the as-spun alloys hold an entire nanocrystalline structure and are free of amorphous phase. The substitution of Cu for Ni leads to a significant refinement of the grains of the as-cast alloys without changing the major phase Mg₂Ni. Both the melt spinning and the substitution of Cu for Ni evidently ameliorate the hydriding and dehydriding kinetics of the alloys. The hydrogen absorption saturation ratio ( ) and the hydrogen desorption ratio ( ) of the Cu2 alloy are enhanced from 56.72 to 92.74% and from 14.89 to 40.37% respectively by rising spinning rate from 0 (as-cast was defined as spinning rate of 0 m/s) to 30 m/s. And those of the as-spun (20 m/s) alloys are increased from 85.99 to 91.22% and from 20.84 to 52.88 respectively by growing Cu content from 0 to 4.

Abstract: The controlled-release tablets of sasanquasaponin (SQS) were prepared by using SQS, cornstalk and chitosan as the main drug and accessories. The effect of the particle size of cornstalk on release rate was studied. The thermal stability and wet stability of the controlled-release tablets of SQS were investigated. The controlled-release tablet of SQS was characterized by IR techniques. The releasing rate of the controlled-release tablets of SQS are controlled by controlling the particle size of cornstalk. The thermal stability and wet stability of the controlled-release tablets of SQS are good. The chemical bonds are formed among SQS, cornstalk and chitosan.

Abstract: The aims of this work were to make use of carbonic materials to remove nitrobenzene in wastewater and investigate adsorption mechanism. The adsorption ability of different carbonic materials for nitrobenzene was compared. It was found that carbon nanotubes and carbon black exhibited higher adsorptive capacity than coconut activated carbon and granular activated carbon at the same experimental conditions. The specific surface areas and pore distribution was obtained by low-temperature nitrogen adsorption-desorption. We concluded that the capillary condensation in mesopores played an important role in the adsorption process owing to special nanostructure of carbon nanotubes and carbon black.

Abstract: Al-doped LiMn₂O₄ was synthesized by γ-Al₂O₃, which has not toxic gas decomposed in the synthesis process. Composition optimization of was carried out in view of the basic knowledge of ternary phase diagram to find the best composition of raw materials in Al₂O₃-Li₂CO₃-MnO₂ ternary system. The results showed that the Al₂O₃-Li₂O-Mn₂O₃ ternary eutectic molten compound with single spinel structure and good electrochemical performance could be formed at temperature of 800°C and the molar ratio of the starting materials in the range of n(Al₂O₃)=0~3.3 mol%, n(Li₂CO₃)=18~22 mol%, n(MnO₂)=75~82 mol%. The Al₂O₃-Li₂O-Mn₂O₃ ternary eutectic compound with the molar ratio of the starting materials of n(Al₂O₃):n(Li₂CO₃):n(MnO₂) at 0.02:0.5:1.96, showed the best electrochemical performance among all studied samples.

Abstract: In this paper, mechanical and dielectric properties of Poly (ethylene terephthalate) (PET) modified by calcium lignosulfonate were measured. The mechanical measurement results show that the introduction of the third monomer LS could significantly reinforce and toughen PET. When LS content was increasing from 0 to 0.5%, the tensile strength of PET was increasing from 54MPa to 62MPa，resulting in an increasing rate of 15%; flexural strength was increased from 85MPa to 92MPa, resulting in an increasing rate of 8%; impact strength was increasing from 2.5KJ.m^-2 to 4.2 KJ.m^-2, resulting in an increasing rate of 68%; but excessive content of lignin would harm mechanical properties of PET. Dielectric measurement results indicated that LS had positive effect on decreasing dielectric loss of PET while content of LS was about 0.5%. LS is an effective additive to improve mechanical and dielectric properties of PET.

Abstract: The effect of process parameters of secondary cooling and electromagnetic stirring (EMS) on internal quality for CC billet is investigated. With these studies, the continuous casting process is optimized, and the internal quality of square/round billet is improved as well. Comprehensive technologies for internal quality control of square/round billet in Panzhihua Steel have been proposed. The results of industrial tests show that the comprehensive rate below level 1.0 of internal defects of center porosity, center segregation and center cracks is more than 97%, and carbon segregation index is in the range of 0.93~1.09. The quality of square/round billet can meet the requirement of consumers absolutely.

Abstract: The total phosphorus removal efficiency is very low and the TP concentration of the effluent can not reach the national standard of GB18918-2002 in CRI system. In order to solve these problems, a series of comparative experiments on phosphorus adsorption capacity of 5 kinds of special infiltration media are carried out. And then another series of comparative experiments on the total phosphorus removal efficiency of 4 kinds of infiltration media combinations are also conducted, the experimental results show that the phosphorus adsorption capacity of sponge iron is the best one among the special infiltration media selected；the phosphorus removal efficiency of the infiltration media including 1/6 sponge iron is much better than the infiltration media including only sand; and the phosphorus removal efficiency of the infiltration media combination with sponge iron homogeneously mixed with sand, is better than the infiltration media combination with the same weight of sponge iron concentrated. The experimental results will help to explore the development of the new type composite infiltration media of the CRI System.

Abstract: Bioleaching is an environmental friendly technology with many potential advantages such as few pollution and low energy requirement. The factors which affected the silicate-dissolving ability of Bacillus mucilaginosus Lv_1-2 on illite were investigated. The results showed that the optimum inoculum amount was 2%.The best carbon source and nitrogen source were glucose and (NH₄)₂SO₄ respectively. The silicon dissolution increased with the powder diameter decreased. The optimal temperature and shaking speed were 30°C and 220 rpm. The proper conditions were consistent with that of the growth of the strain,which confirmed that the strain played an important role in bioleaching.