Advanced Materials Research Vols. 399-401

Abstract: In this paper, ions i.e. Cu²⁺, Pb²⁺and Cd²⁺ were absorbed by the amphoteric bagasse hemicelluloses, and the influences of pH value, adsorption time and the initial concentration of metal ion have been studied. The results show that the optimal adsorption pH values for Cu²⁺, Pb²⁺ and Cd²⁺ are 6.5, 6.0 and 7.5, respectively. The adsorption capacity to ions Cu²⁺, Pb²⁺ and Cd²⁺ reaches the maximum values when the adsorption time is 180 min. Net adsorption to ions Cu²⁺, Pb²⁺ and Cd²⁺ increases with increasing the initial concentration of the metal ions. Analysis results of adsorption dynamics show that the adsorption of Cu²⁺, Pb²⁺ and Cd²⁺ follows Ho 's Pseudo second-order kinetics linear model. It can be seen from the adsorption isothermal research that absorption of the amphoteric bagasse hemicelluloses to ions Cu²⁺, Pb²⁺and Cd²⁺ can be well described by the Langmuir isotherm linear model. Moreover, the theoretical values of the maximum absorption capacity qmax for ions Cu²⁺, Pb²⁺ and Cd²⁺ were determined to be 21.98 mg/g, 81.97 mg/g and 31.85 mg/g, respectively.

Abstract: NaZnPO₄ was prepared by heat-treating precursor with Zn(NO₃)₂٠6H₂O、H₃PO₄ and anhydrous sodium carbonate as raw materials by co-precipitation method, and it was characterized with UV/VIS spectrophotometer、X-ray diffraction (XRD). The experiment results shown that the near-infrared reflection property of NaZnPO₄ was very good. when the heat treatment temperature of preparation of NaZnPO₄ was range from 400°C to 800°C, near-infrared reflection properties of products were similar. Among them, the products with the heat treatment of 600°C has the best near-infrared reflection property,which is reached up to 95.2% in average,while the near-infrared reflection of TiO₂ is 74.1% in average.

Abstract: External thermal insulation technology for building external wall has gradually been one important technology of the construction energy conservation. A new fibre reinforced composite material is made up of cement, flyash, silicon ash, the inflation polystyrene pellet and the admixture, after the experiment examination and the engineering application, the effect of thermal insulation is good, the performance of fire proof is excellent, high durability and low cost, good property of sound absorption. Solved the quality problem exist in the traditional building outer wall thermal insulation system such as the thermal insulation layer fall off, split, seep and so on. The new material can product standardize in factory, increase the construction efficiency; in favor of the construction industrialization and could promote construction business sustainable development.

Abstract: Different siliceous materials were selected for grinding aid agent to studying the effect for specific surface areas of quick lime and autoclaved samples compressive strength. The results show, grinding aid effect of quartz sand, waste lime sand brick and fly ash are significant for block quick lime. The rational contents of grinding aid agent are about 10%. And grinding aid effect of quartz sand is best. The compressive strength of autoclaved samples improved obviously with lime mixed the grinding aid agent, and the compressive strength increased range of autoclaved sample is more than 50%. The effect of different grinding aid agent for improving compressive strength of autoclaved samples is obviously different, and the improving strength effect of fly ash is best for grinding aid agent.

Abstract: The aim of the paper is to analyze the effect of the additives on thermal conductivity of the phase change material. The experiment about heat storage and heat release performance of the composite phase change material which uses sodium acetate trihydrate as host material is studied. The effect of the expanded graphite on the composite phase change material is investigated. The results show that: expanded graphite which can be dispersed evenly in the composite phase change material, the thermal stability is well, significantly improve the thermal conductivity of the composite phase change material.

Abstract: High performance polycarboxylate-type superplasticizer (PCSP) was synthesized with acrylic acid (AA), polyethylene glycol allyl ether (APEG) and one monomer of methyl acrylate (MA), methacrylate acid (MAA), acrylamide (AM), and ethyleneglycol dimethacrylate (EGDMA). Ammonium persulfate and thioglycolic acid, as an initiator and a molecular weight regulator respectively, were used for radical polymerization in aqueous solution. Influence of superplasticizer on the cement fluidity of grout was investigated. The results showed that plasticizer admixture compounded with EGDMA-APEG-AA had excellent dispersibility and slump retention.

Abstract: Abstract. Polythiophene nanoparticles prepared by W/O microemulsion method were found to be photocatalytically active for degradation of Orange II dye and methyl Orange. During the photodegradation of Orange II and Methyl Orange as organic dyes in UV/H₂O₂ and UV irradiation systems using polythiophene nanoparticles as photocatalyst, it is exhibiting significant photocatalytic activity towards to double dyes in UV and UV/H₂O₂ system. the diameter of spherical polymer nanoparticles is 100±20 nm which was characterized by TEM with good dispersity. Furthermore, its photocatalytic efficiency for degradation of Orange II and Methyl Orange under UV irradiation is 2.54 and 1.95 times higher than normal polythiophene composites relatively. According to the testment by Accelerated Surface Area and Porosimetry System, The true cause lay in the fact that the specific surface area of Polythiophene nanoparticles is 106.6 m2/g compared to normal Polythiophene is 24.2 m2/g, This conjugated polymer characterized by FTIR spectroscopies before and after photocatalytic reactions shows reliable chemical stability. In addition, it held excellent recovery ability and kept up their catalytic activity with indistinctive drop after six repeated utilization.

Abstract: This study used Type I Portland cement with Na2Oeq of 0.67 % to fabricate a mortar specimen with a w/c ratio of 0.5 and a dimension of φ10 × 3 cm, adjusted to the 6 w/c ratios of 0.35, 0.40, 0.45, 0.50, 0.55 and 0.60. The specimen was applied constant current density of 9 A/m² during the Accelerated Lithium Migration Technique (ALMT) experiment. The results show that during the application of the current, over 86.4% of the electricity applied used in the production of gas through electrode reactions, and about 3.9-4.6% in cation migration. The required time of removal for Na+ and K+ decreased with increases in w/c ratio. The average removal percentage of Na⁺ and K⁺ increasing with the increase in w/c ratio. There was a good linear relationship between the ste^{Superscript textSuperscript text}ady-state flux and migration coefficient of Li⁺ and w/c ratio, and the steady flux of migration coefficient increase with increase in the w/c ratio.

Abstract: Konjac glucomannan (KGM) has been widely used in pharmaceutical, chemical engineering, food industry, drug carrier delivery, etc. The sol-gel transition kinetics of KGM dilute solution was studied by steady fluorescence spectroscopy in this article. The results showed that the gel point of KGM solutions depend on the concentration of KGM, pH value and temperature. The sol-gel phase transition activation energy, ΔE, was calculated to be 83.1 kJ/mol based on first reaction kinetic model.

Abstract: In this paper, the influences of combustion atmosphere on the desulfurization characteristics such as SO₂ emission, Content of f-CaO, desulfurization degree and mneralogical composition by means of flue gas analysis, chemical analylsis and X-ray diffraction(XRD). The results show that calcium sulphoaluminate gradually increase as the temperature and reached a maximum at 1300°C. However, during the process of coal combustion, the generation quanlity of calcium sulphoaluminate is not much. This is because the material composition of the coal complex, such as Fe₂S, SiO₂ and other substances have more influence on calcium sulphoaluminate formation. And oxidizing atmosphere promotes the ability of desulfurization at high temperature combustion, and the reducing atmosphere is contrary. The oxidizing atmosphere reduces the SO₂ emissions, improves the burnability of raw materials, promotes the formation of calcium sulphoaluminate and thus increases the desulfurization degdree. Whereas, the reducing atmosphere promotes the decomposition of CaSO₄, increasing the SO₂ emissions and f-CaO contents, reduces the formation of calclium desulfurization degree greatly, and then decreases the desulfurization degree. Introduction