Advanced Materials Research Vols. 610-613

Abstract: A cationic organic flocculant epichlorohydrin-dimethylamine(EPI-DMA) was employed for the treatment of simulated leather-making process wastewater. The study aims at investigating the flocculation performance of EPI-DMA for the leather dyeing wastewater which contains fat-liquoring agent wastewater and retanning agent wastewater. The results show that decoloration efficiency of EPI-DMA for dyeing wastewater can reach around 90% with proper dosage. For containing retanning agent wastewater, EPI-DMA also has good flocculation performance, but for containing fat-liquoring agent wastewater, flocculation performance of EPI-DMA was poor.

Abstract: In order to study the correlation between accelerated corrosion and natural corrosion, reinforced surface morphology, steel potentials and corrosion quality were investigated by using full immersion and half immersion in this paper. The results showed that the effort of half immersion accelerated corrosion was similar to natural corrosion, and each of the tendencies of potential change was same, but the mechanisms of corrosion were different. The degree of steel corrosion, estimated by Faraday’s law, was slightly higher than the level of actual corrosion.

Abstract: Wood pulp composite spunlaced nonwoven is a new environment-friendly material that can disintegrate in toilet system. It could be easily flushed into septic or sewer systems, thus avoids the risk of clogging the pipes. In this study, the flushable wood pulp composite spunlaced nonwoven was prepared and the flushability testing method was developed. The effects of testing parameters and conditions on the flushability were studied through laboratory experiment and theoretical analysis. It was found that the size of sample, liquid volume, shaking speed and shaking time were directly related to the disintegration ratio. A medium sample size, a higher liquid volume, a higher shaking speed and shaking time can result in a good disintegration. These factors should be taken into serious consideration when testing the flushable or disintegrating properties.

Abstract: Waterborne epoxy resin was prepared through introducing hydroxyl and carboxyl groups in the main chain of epoxy resin with the bisphenol epoxy resin, toluene diisocyanate and 2,2-dimethylol propionic acid by self-emulsification. Analyzed the structure of products via Fourier transform infrared spectrometer, then to test the water-soluble and stability. And the best conditions of reaction were determined through studying the influence of material ratio, reaction time and reaction temperature to products. The result shows that the synthesized waterborne epoxy resin has favorable stability and water-dispersion.

Abstract: Fe₂O₃@SBA-15 oxygen carrier models were built to investigate the reaction stoichiometry mechanism between the fuel gas CO and oxygen carrier Fe₂O₃ in chemical-looping combustion system. The binding energy of CO adsorption on Fe₂O₃@ SBA-15 is -0.402 eV, and the atomic structures, electronic proper of the CO/Fe₂O₃@SBA were also analyzed. The calculation results for the oxidation CO have an important understanding of the process of scientific significance, which will promote the fundamental understanding and applications of the oxygen carrier Fe₂O₃.

Abstract: Based on the principles of green manufacturing, the ecological system of furniture design consists of the ecological furniture design analysis, implementation, evaluation, as well as supporting and maintenance. Compared to the traditional furniture material election, the material election subject to the green manufacturing presents a new philosophy. The principle of furniture material election subject to the green manufacturing involves the combination of technical principle, economical principle and environmental principle. This article also discusses the minimization of life-cycle cost of furniture material election subject to green manufacturing.

Abstract: A modified phenol-formaldehyde (PF) resin was synthesized under alkaline condition in varying proportion of borax up to 21% (w/w). All the prepared resin were characterized by free phenol content, free formaldehyde content as well as hydroxymethyl content. It was proved by Fourier transform infrared spectrometer (FTIR) that B-O bond had been successfully introduced into the structure of PF resin. Thermo gravimetric analyzer (TGA) and different scanning calorimetry (DSC) were used to characterize the thermodynamic characteristics of the PF resin. The result showed that when the mass fraction of borax was 9wt.% of PF resin, the heat resistance was the best and the curing temperature of the modified PF resin was higher than that of the unmodified PF resin.

Abstract: Collagen fiber loaded hyperbranched polyamide-amine(CF-HBPN) was prepared by the crosslinking power of glutaraldehyde. The structure of CF-HBPN before and after adsorption was characterized and analyzed via scanning electron microscopy. The CF-HBPN was effective adsorbent for the removal of Cr(VI) from aqueous solutions. The adsorption isotherm and kinetic of the adsorption process were studied. The experimental results were fitted using the Langmuir, Freundlich and Temkin equations. The experimental results indicated that the Langmuir isotherm was better in describing the adsorption process. Two kinetic models, the pseudo-first order and pseudo-second order, were used to analyze the kinetic data. The pseudo-second order model was proven to be better in describing the adsorption behavior.

Abstract: To obtain a new type of construction material with lower CO₂ emission and energy consumption, fly ash was used as the main components. Solution of NaOH/KOH and water glass were applied as alkaline activator. The amount of water glass and the ratio of alkaline/water glass were varied to adjust Si/Al ratio to reach an optimal value. The specimens were cured in air and oven, then their mechanical properties such as compressive strength and bending strength were measured and their microstructures were investigated.

Abstract: Use natural zeolite to prepare spherical composite zeolite filter material. With range analysis, the composite zeolite filter material’s packing density is 674Kg/m3, cylinder compressive strength is 4.32MPa, and apparent porosity is 59.02%. Compared with ceramsite, composite zeolite filter whose surface roughness has larger specific surface area and higher porosity. At the start of biofilm formation and stability of the operational phase, composite zeolite filter Biological Aerated Filter (BAF)’s ammonia removal is better than ceramsite BAF, and its Biofilm biomass is higher, thus more proper to be the carrier of BAF.