Advanced Materials Research Vols. 113-116

Abstract: For manufacturing high mechanical properties and environmental-friendly particleboard, a formaldehyde-free soybean meal (SM)-based adhesive was developed and applied in the mechanical manufacture of particleboard. The thermal behavior of the adhesive was investigated and the properties of the particleboard were tested according to Chinese Standards methods. The results show that the optimum technical parameters were: hot-pressing temperature was 180 °C, hot-pressing time was 65 s/mm, moisture content was 12 %, and glue content was 15 %. The MOR and IB of particleboard were 20.6 MPa and 0.59 MPa respectively. It fully fits the Chinese National Standards GBT 4897.5-2003. Therefore, it is a practical way for manufacturing environmental friendly particleboard by SM-based adhesive.

Abstract: The objective of this paper is double layer competition sports flooring. The orthogonal regression experiments were carried out in order to establish the regression equations between keel structral influence factors (keel siding, keel thickness, keel spacing) and property indexes of sports flooring (force reduction rate Fr, standard vertical deformationVd, ball rebound rate Br). Through SPSS analysis method it find that factors and factor interaction have significant effect on Fr,Vd and Br respectively at a 95% or above confidence level. Then the regression equations of each experimental index are established and the optimum factor combinations are found out. After balancing the three experimental indexes, this paper concludes the comprehensive optimum keel structural parameters for whole property which are the span keel spacing 500mm×500mm, keel cross section 50mm×50mm. The regression equations show the statistical relationship between keel structure and property. They can be directly applied to assist the design, production procedure of keel and the field installation of sports flooring.

Abstract: The purpose of the study was to use a cheap wheat straw to manufacture particleboard. Wheat straws offer great promise and new challenges as replacement for wood in processed wood products. The particleboard was produced using composite adhesive which the urea-formaldehyde (UF) adhesives modified by emulsifiable polymeric methylene diphenyl diisocyanate (EPU). The properties of the particleboard was evaluated by measuring internal bonding strength(IB), thickness swelling, modulus of rupture(MOR), modulus of elasticity (MOE) and formaldehyde emission. The optimal condition was chosen at density of 0.75g/cm3, UF/EPU ratio of 70/30, adhesive amounts of 10% based on the dry amounts of wheat straw. The test results showed that maximum dry internal bonding strength, wetting internal bonding strength, modulus of rupture, modulus of elasticity was 0.45MPa, 0.072MPa, 31.50MPa and 4564MPa, respectively. The thickness swelling (TS2h) and thickness swelling (TS24h) was 3.51% and 11.1%, respectively. The free formaldehyde of wheat straw particleboard reached E0-type national standards.

Abstract: Red mud with high content of Fe2O3 orignated from alumina industry which contains a amount of rare elements are excellent mixed-oxide materials for emissivity. A variety ratio of mixed-oxide material is achieved by doped with CuO, NiO, etc.Sintering processing was used to prepare powder material in a continuous wide-band which infrared emission rate more than 0.9. Find a new and feasible technological route for high-iron red mud as secondary resources.

Abstract: Transition metal ions have wider optical absorption than TiO2. They can extend the range of absorption light to visible light, taking titanium-baring blast furance slag(TBBFS) as photocatalytic material with a certain amount of transition metal ions to broaden the scope of its spectral absorption and to improve its photocatalytic properties. The impact of transition metal ions Fe3 +, Zr4 + on photocatalytic properties of TBBFS was studied and their optimal doping was searched. TBBFS was grinded and re-doped with transition metal ions and then roasted to prepare photocatalytic materials, using methylene blue’s degradation rate under condition of UV irradiation to evaluate material properties and then using XRD, SEM and other analytical tools for its material characterization. Results show that: doping of transition metals Fe (NO3)3 and ZrO2 can improve the photocatalytic nature of TBBFS and the best doping amount is 0.5% and 3.0% relatively, and its degradation rate is 69.2% and 73.0% respectively.

Abstract: Resin D072 was more useful on the adsorption of Fe2+ as a heterogeneous catalyst in the presence of H2O2, which had high catalytic activity in the decolorization of reactive red KE-3B. The conditions of the adsorption of Fe2+ by D072 were optimized, including the initial pH, the Fe2+ concentration and reaction time. It was found that the optimal pH was pH3. The optimal initial concentration of Fe2+ and reaction time were 840 mg L-1 and 60 min, respectively. It illustrated that the adsorption behavior of Fe2+ by D072 obeyed Freundlich adsorption model. The decolorization reaction of reactive red KE-3B was still faster though the catalyst already used 10 times because Fe leaching from the catalyst was negligible. The heterogeneous catalyst seems to be viable method for achieving significant decolorization of dying industry wastewater.

Abstract: Macroporous exchange resins have been applied as supports for enzyme immobilization. The supporters were activated by cross-linking with glutaraldehyde, then Laccase was immobilized. Parameters of the immobilization process were optimized. The results of repeated batch showed the optimal immobilization conditions (10% of glutaraldehyde, pH=3, temperature=45 °C). In addition, the biocatalyst also showed good operational stability, maintaining 45% of its initial activity after 10 cycles of oxidation of ABTS. The immobilized laccase had potential for application in the continuous decolorization of textile effluents.

Abstract: Highly ordered mesoporous TiO2 was synthesized by a hydrolysis condensation process using block copolymer P123 as the template and tetrabutyl orthotitanate (TBOT) as titanium precursor.The influences of the synthesis parameters including the volume of solvent, the ratio of the template to TBOT and reaction pH on the structure were investigated. The structure properties of the products were characterized with low-angle XRD, FT-IR, N2 adsorption-desorption analysis. The results showed that the amount of solvent played a decisive role for the formation of ordered pore structure. The proper hydrolysis pH is in neutral and acidic range. The template can be removed totally by Soxhlet extraction with ethanol and the mesoporous structure can be retained perfectly by this template removal method. The product has the BET surface area of 266.5m2/g and a narrow pore distribution with a peak at 4.34 nm.

Abstract: For increasing the curing rate and decreasing the curing temperature, modified phenol-formaldehyde (PF) resins were synthesized under a complex catalyst. The bonding strength and formaldehyde emission of the plywood bonded by them were measured according to Chinese National Standards methods. The curing behavior was conducted by differential scanning calorimetry (DSC) measurement. The results indicate that PF resins catalyzed by the complex catalyst show more moderate pH values, lower curing temperature and shorter gel time comparing with control ones. Plywood bonded with modified PF resins shows good bonding strength and low formaldehyde emission even at low hot press temperature (110 °C), which is closed to the plywood bonded with normal control PF resin at high hot press temperature (130 °C).

Abstract: La1-xMgxNi2.8Co0.7 (x=0.1, 0.3, 0.5) hydrogen storage alloy was synthesized by solid diffusion method. The microstructure of the alloy was analyzed by XRD when the content of Mg was changed. When x equaled to 0.3, there was relative much La2Ni7 phase in the alloy and the alloy exhibited better integrated electrochemical performance. Its maximum discharge capacity reached 355.4mAh/g and capacity retention after 50 cycles（S50）was 77.80%. The results showed the existence of La2Ni7 phase would be conductive to the integrated electrochemical performance of the alloy.