Advanced Materials Research Vol. 1015

Abstract: Lubricant base oil is an environmentally friendly lubricant with good lubricity and biodegradability. The thermostability and stability of rapeseed oil get improved through chemical modification. Fatty acid methyl ester (FAME),prepared by rapeseed oil as starting material with methanol by transesterification,the composition of FAME was detected by gas chromatograph-mass spectrometer (GC-MS).Trimethylolpropane (TMP) esters of fatty acids were synthesized by transesterifying FAME with TMP using zinc oxide as catalyst. The structures of products were characterized by mean of FTIR. The reaction conditions were studied and optimized, the optimum conditions were as follows: the temperature at 140°C~150°C, the reactant mass ratio of 1:9, the reaction time for 6 h, the mass content of catalyst of 0.5%.The thermal stability of product was conducted by thermogravimetry (TG) .It could be concluded that TMP esters of fatty acids possess better thermal stability.

Abstract: Based on 1-amino-4-hydroxy-2-phenoxy anthraquinone (Disperse Red FB) and ethylene glycol phenyl ether as raw materials, polyethylene glycol (PEG) as catalyst, condensation in alkaline conditions. The optimum reaction temperature is about 140°C, 4 h reaction times, 9g catalyst, the ratio of recovery and fresh consumptions of ethylene glycol phenyl ether is controlled in 1:1 (ml). The reaction end point is easy to arrive in these conditions, and the yield of disperse peach SE-RL (Disperse Red 191) is the best, about 79.2%.

Abstract: Using selective catalytic reduction (SCR) that takes NH3 as the reducing agent to remove NOx is one of the most often used coal-fired flue gas denitration technology that of the highest denitration efficiency. As the core of the SCR system, catalyst is the important factors that affect the whole SCR system denitration efficiency. As the growth of the running time, catalyst tends to lose active energy because of the surface channel jam and toxic element enrichment and deactivation. Each year the deactivation catalyst regeneration process, can save a lot of money, thus help to avoid pollution of the environment. So study of the SCR catalyst regeneration technology is around the corner, which is of great practical significance for lowering the cost of the SCR system, promoting the application of the SCR technology, and protecting the environment. In this paper, the research takes vanadium series SCR catalysts as the object to study the regeneration technology of catalyst, new physical structure recovery method, and effect of regeneration process in the treatment on the performance of catalyst.

Abstract: Cu₂O/PVA/chitosan composite films were prepared successfully by reduction-precipitation method and tape casting process. The composite films were characterized by TEM, SEM, XRD and FT-IR. The characterization results showed that Cu₂O particles were 200-300 nm in diameter and in situ formed on PVA-chitosan blend films. The visible-light photocatalytic decolorization behavior on Cu₂O/PVA/chitosan was evaluated using reactive brilliant red X-3B (X-3B) as a model pollutant. The influences of various experimental factors on X-3B decolorization were investigated. Results showed that the decolorization rate of X-3B could reach 99.8% after 50 min irradiation under the conditions of initial dye concentration 20 mg/L, catalyst amount of 0.8 g/L, H₂O₂ dosage of 4.04 mmol/L and pH 5.6. After composite film was reused for 5 times, the decolorization rate of X-3B could still reach more than 90% after 110 min irradiation

Abstract: The self-assembly membranes (the SAMs) was prepared on aluminum alloy at three different temperatures. The electrochemical properties of Al alloy with SAMs and bare Al alloy were investigated by electrochemical impedance spectroscopy in a 3.5wt. % NaCl solution. The measured EIS data was simulated by an equivalent circuit. The results demonstrated that the Impedance value of 1 h preparation time was greater than the other time. To illustrate, with the preparation time was long, they have not better the performance of self-assembled monolayers.

Abstract: As human activities continue to alter the global nitrogen cycle, the ability to predict the impact of increased nitrogen loading to river systems is becoming more and more important. Nitrogen retention is of particular interest because it is through its combined processes that local and downstream nitrogen concentrations are reduced. To determine the potential for N removed from Feng River network, we used stream chemistry and hydrogeo-morphology data from 17 stream and river sites to estimate NO₃^-–N removal in Feng River system of China. We used a N removal model to predict NO₃^-–N input and removal in December of 2011. NO₃^-–N input ranged from 0.06 to 20 kg km^-1d^-1in the Feng River system. Cumulative river network NO₃^-–N input was 446 ton year^-1 in dry season in whole water system. NO₃^–N removal based on the model ranged from 0.04 to 4.2 kg km^-1d^-1 December of 2011 for Feng River. Cumulative river network NO₃^-–N removal predicted by the model was 58 ton year^-1 in dry season. Proportional NO₃^–N removal (PNR) ranged from 0.2 to 0.6 in this time. PNR was negatively correlated with both stream orders.

Abstract: The variation of pH value during the carbonation of CaCl₂ solution was measured by pH meter and its effect on the dissolution of CO₂ and the concentration of CO₃^2– in the present work. Ca²⁺ is consumed gradually during the carbonation process, so the effect of pH value on the concentration ratio of Ca²⁺ to CO₃^2– was also discussed in this paper. pH value decreases increasingly slowly as the reaction progresses. The addition of ammonia can not only improve the dissolution of CO₂, but also enhance the concentration of CO₃^2–. The concentration ratio of Ca²⁺ to CO₃^2– decreases with reaction time because of no supplement in Ca²⁺ during the carbonation process.

Abstract: A cathode process of nanodiamond field emission display based on diode structure by electrophoretic deposition has been explored. In this process, a certain proportion of nanodiamond electrophoresis liquid has been developed, the nanodiamond field emission cathode has been deposited on the polished metal titanium substrate by electrophoresis. The surface appearance and microstructures of the coating has been observed by scanning electron microscopy and Raman spectroscopy and the field emission properties of the prepared cathode coating has been tested. The experimental results show, the diamond-coated surface which has been deposited on titanium substrate is thin and uniform. Compared with the cathode prepared by the spin coating process, it has more field emission current density and better field emission current uniformity and stability. With a simple, low cost and large-area production and other advantages, it can be widely used in flat panel displays.

Abstract: Chitosan-aluminum oxide composite material was synthesized through chemical bonds with chitosan and isopropanol aluminum as raw material, whose structure was characterized by SEM. The influence of reaction conditions on adsorption performance were studied, such as temperature, time. Results show that in the composite materials, chemical bonds were existed between aluminum and chitosan, inorganic aluminum oxide evenly dispersed in the surface of chitosan molecular. The adsorption capacity of such composite towards Cu²⁺ had been greatly improved better than the mixture of chitosan and Al₂O₃ materials and chitosan .the adsorption rate of Cu²⁺ was 13% higher than that of chitosan, adsorption capacity is up to 146 mg/g.

Abstract: Chitosan-aluminum oxide composite material was synthesized through chemical bonds with chitosan and isopropanol aluminum as raw material, whose structure was characterized by SEM. The influence of reaction conditions on adsorption performance were studied, such as temperature, time. Results show that in the composite materials, chemical bonds were existed between aluminum and chitosan, inorganic aluminum oxide evenly dispersed in the surface of chitosan molecular. The adsorption capacity of such composite towards Hg²⁺ had been greatly improved better than the mixture of chitosan and Al₂O₃ materials and chitosan .the adsorption rate of Hg²⁺was 18% higher than that of chitosan, adsorption capacity is up to 900mg/g.