Advanced Materials Research Vols. 233-235

Abstract: A kind of soluble triphenyl-imidazoline quaternary-ammonium-salt was synthesized from benzoic acid, triethylene tetramine, and benzyl chloride. The structure of synthetic product was characterized by IR, and the corrosion inhibition performance was tested by static weight loss method. The corrosion-inhibiting rate of the imidazoline quaternary–ammonium-salt in the concentration of 1.0% was above 99.0%. In this paper, the compounding between the synthetics and I^- was studied, and the results showed that the inhibition performance of synthetic inhibitor and its combined system was satisfying.

Abstract: Silica was prepared by precipitation method in the laboratory, and the factors which affect the performance of silica were evaluated. The results show that the reduction of concentration of base solution and reaction temperature and the increase of pH value could improve the specific surface area of precipitation silica. Specific surface area of silica prepared in laboratory is greater than which was prepared in production line and DBP absorption value and particle size are smaller than the latter. Drying process and drying methods have important influences on performance of precipitation silica. Mechanical pulverization could reduce the particle size of silica slightly and the stacking density obviously.

Abstract: Emulsify epoxy resin E-44 with heavy calcium carbonate, light calcium carbonate, aerosil, surface-modified aerosil and bentonite BP-187. The experimental results show that neither heavy calcium carbonate nor light calcium carbonate has emulsifying effect. O/W type emulsion can not be obtained with aerosil and bentonite BP-187. Surfactant-modified aerosil CTAB-SiO₂ and DTAB-SiO₂ do have emulsifying effect, and they can transform into more stable O/W type emulsion. The synergy between BP-17, EP-1 and CTAB-SiO₂ is obvious. Hydrophilic emulsifier EP-1 could be replaced by CTAB-SiO₂ or BP-187 completely or partly to prepare stable O/W emulsion. The TEM result show that the disperse phase of the emulsion produced by CTAB-SiO₂ and the compound emulsifier of CTAB-SiO₂ and BP-187 is irregular floc, and the disperse phase of the aqueous emulsion produced by the compound emulsifier of CTAB-SiO₂ and EP-1 is regular globular or ellipsoidal multiple emulsion.

Abstract: Mg(OH)₂ is a kind of inorganic fire retardant additive with many excellent properties. In this paper, taking MgSO₄ as magnesium source and mixed alkali solution of NaOH and ammonia water as precipitant, flaky Mg(OH)₂ powders were synthesized via precipitation method. The fire retardancies of product were tested through preparing and characterizing fire retardant paint, which completely meet the first technical requirements of national standard.

Abstract: Applicable configuration alteration of the electrodeionization （EDI）process commonly for pure water production was carried out to treat dilute nickel wastewater in this paper. The effects of major operating parameters such as applied voltage, dilute and concentrate stream flow rates on the performance of EDI process were investigated systematically. The results showed that, with the feed water containing 50mg·L^-1 Ni²⁺ and pH of 5.7, the dilute resistivity of the EDI could reach higher than 1.0MΩ·cm which gave a Ni²⁺ rejection more than 99.8% while the Ni²⁺ was concentrated as high as 1564mg·L^-1 in the concentrate stream by optimizing the operating parameters. It was indicated that pure water production and concentrating of heavy metal ions could be simultaneously accomplished via EDI technology just in one process, valuable heavy metal and water resource could be recovered as well.

Abstract: Several new heteropoly compounds catalysts with pronounced activities in NO_x conversion via adsorption-decomposition process in a fixed-bed reactor were evaluated concerning the principal internal and external factors having marked effects on the process of adsorption. Results showed that substitution of H⁺ in HPW (H₃PW₁₂O₄₀•6H₂O) by NH₄⁺ results in marked enhancement of the catalyst activity, however, substitution of coordination atom W in the [PW₁₂O₄₀]^3- anion by one or more Mo atoms tends to lower the catalyst activity and such tendency deepens with the increase in the Mo atom numbers introduced. It is for the first time that the nano-effect was observed with nano (NH₄)₃PW₁₂O₄₀ catalyst, in which a 1.6% to 10.6% enhancement in NO_x adsorption efficiency was obtained in comparison with the same catalyst in normal particle size. By IR analysis, NO was found to be adsorbed via interaction with the proton of HPW structure. With the aid of GC-MS analysis, the process effectiveness for NO_x decomposition into N₂ was confirmed.

Abstract: In this paper, based on the previous studies of natural organic acids adsorbed onto bi-functional resin, the influence of metal ions on the adsorption of humic, tannic and gallic acids by bi-function resin WJN-06 were systematically investigated. Low concentration of Ca²⁺ and Mg²⁺ in solution could decrease the resin’s adsorption capacity for gallic acids, but increased the removal rate of humic and tannic acids. Low concentration of Cu²⁺ and Pb²⁺ in solution could enhance the uptake of these three natural organic acids. However the high concentration of metal ions in solution could decrease the adsorption capacity of bi-functional resin for humic, tannic and gallic acids.

Abstract: In this work, TiO₂ thin films were deposited on borosilicate glass substrates by sol-gel dip coating method and calcined at 500 °C for 15 min(heating rate3°C /min). The TiO₂ sol was prepared by fixing concentration of titaniumtetraisopropoxide(TTIP), TritonX-100 surfactant, ethanol and conc hydrochloric acid but amounts of acetyl acetone (Acac ) were various as 4, 6 and 8 mole respectively. After calcination process, all the TiO₂ thin films were homogeneous and transparent. Several techniques , such as X-ray diffraction (XRD), UV-Vis spectroscopy, Environment Scanning Electron Microscope (E-SEM), atomic force microscopy (AFM) and BET surface area analysis were used to characterize the prepared TiO₂ thin film. Spectra of XRD showed that the crystal structure was anatase phase with the crystal sizes of 9.05 – 12.57 nm. According to BET surface area analysis, the surface area , pore volume and pore size of TiO₂ were in the range of 66.35-82.53 m²/gm , 0.1194-0.1301 cm³/g and 57-71 A⁰ respectively. The photodegradation of Reactive Blue 19 by the prepared TiO₂ thin films showed decomposition rate of 97.58% , 95.03 % and 94.48% for the thin films prepared by using 4, 6 and 8 mole AcAc respectively.

Abstract: Disposal of total phosphorus in wastewater from glyphosate production was studied by combined adsorption treatment and advanced oxidation processes. The effect of the nano-metal/resin complexes on the result of experiment was investigated. And it is found that complex of nano-metal on the resin surface do not have obvious effect on the adsorption behavior of resin and nano-metal complexes. Taking advantage from the nano-metal/resin complexes in advanced oxidation processes, the maximum degradation rate of glyphosate was enhanced up to 60.5%.

Abstract: Formation of sulfuric acid aerosol form a binary mixture of sulfuric acid and water is one of the most important process of secondary particles formation in troposphere, which can seriously affect the atmospheric radiation balance and climate change directly or indirectly, therefore, in this research, secondary aerosol generation by photo oxidation by UV of SO₂ containing model air in a flow reactor was investigated experimentally, and the particle size distribution was measured by differential mobility analyzer and Faraday cup electrometer (DMA-FCE) system. Experiments were carried out at various ambient pressure and residence time, and the temperature of reactor was kept at 25, the experiment aims to find out the impact of pressure on this system. The results showed that in low pressure, the growth of aerosol particles was enhanced due to the increase of Brownian coagulation coefficient.