Advanced Materials Research Vols. 881-883

Abstract: An electrochemical sensor for estradiol was prepared by a molecularly imprinted polymer (MIP) film and its recognition properties for estradiol were investigated. The polypyrrole (PPy) film was prepared by electropolymerizing pyrrole on gold nanoparticles (Au NPs) and graphene (Gs) modified glassy carbon (GC) electrode. The electrochemical response of 17β-Estradiol (17β-E2) at the imprinted PPy-Gs-Au/GC electrode was investigated by cyclic voltammetry. The results indicated that the imprinted PPy-Gs-Au/GC electrode can effectively improve the electrochemical signal of 17β-E2 and eliminate interferences of other interfering substances. The results showed that a wide detection linear range (3.0 × 10^-9 1.0 × 10^-6 mol L^-1) for the determination of 17β-E2 with the low detection limit of 1.0 × 10^-9 mol L^-1 (S/N = 3) was obtained. The proposed sensor exhibited fast balance response time of 10 min, which is propitious to rapid detect 17β-E2 in real samples. The merits of the imprinted electrode suggested an attractive and broadly applicable way for developing the chemical sensor used for the estrogen detection.

Abstract: In order to find a new way to utilize the high phosphorus oolitic hematite ore as raw material for steelmaking, the reduction and carburization of high phosphorus oolitic hematite by the gas of CH₄-H₂ were studied. High phosphorus oolitic hematite, reduction and carburization products were investigated by the means of XRD and scanning electron microscope. The SEM-EDS and XRD analysis show that the main compositions of this ore are hematite and quartz, main microstructure is oolitic cluster with the zonal distribution of hematite and apatite, and iron carbide can be prepared from high phosphorus oolitic hematite.

Abstract: The inhibition behavior of a new type of mercury-free composite inhibitors for zinc corrosion in zinc-manganese dry battery was studied by single factor test and orthogonal experiment. Its inhibitor mechanism was investigated by Tafel polarization curve, electrochemical impedance spectroscopy (EIS) techniques. The performances of the coated paper and self-assembled battery were detected. The results showed that: the inhibition efficiency of the composite substituting mercury corrosion inhibitors was up to 93.33%. The performances of the coated paper and battery were consistent with standards. The composite corrosion inhibitors are a green environment- friendly corrosion inhibitor, which is expected to replace mercury in zinc-manganese dry batteries.

Abstract: Based on thermodynamic calculation results of Fe-Cu-Cl-O system by FACTSAGE software, chlorinate reaction of Fe-Cu-O melts was studied. The (CuCl)₃(g) gas can stably exist under a certain condition. At 1273K, the high purity N₂ gas was used as the carrier gas to decrease the partial pressure of (CuCl)₃(g) gas of FeO-Cu₂O-CaCl₂ melt to promote the generation of of (CuCl)₃(g). Thus Cu was transformed to chlorides and removed from the melt. Between 1123K and 1273K, after specimen of FeO-Cu₂O-CaCl₂ system was sintered for 4h, the evaporation ratios of Cu and Fe were 55.45 % and 4.02 %, respectively. The results show that the chlorination reaction is an effective method to recycle the copper and iron.

Abstract: Effects of dispersed ionic liquid (IL) on physical absorption of CO₂ in aqueous solution were investigated in the study. IL-in-water emulsion had been prepared, whose continuous phase was surfactant aqueous solution, and dispersed phase was an ionic liquid, 1-octyl-3 methyl imidazole hexafluoride phosphate. The morphololgy of dispersion had been observed by visual method. The CO₂ concentrations in the bulk of the absorption solvent were calculated. Results show that the enhancement of carbon dioxide mass transfer was realized by IL-in-water emulsion. The reason for the increase of CO₂ mass transfer rates by dispersed ionic liquid has been attributed to the increase of mass transfer driving force depending on shuttle effect.

Abstract: Based on the theory of coordinate inhibition three nitrogen-containing active structures of different aromatic in coal were established. Using quantum chemistry calculation method, the effect of hydrogen bonding on the formation of complexes that formed by three nitrogen-containing active structures of different aromatic and inhibitor were calculated in B3LYP/6-311G* levels. The results show that hydrogen bond can make H₂O participation in forming complexes which formed by three nitrogen-containing active structures of different aromatic and metal ions. Hydrogen bonds play a molecular recognition and guiding role in the process of H₂O involved in the formation of complexes. After H₂O participating ligand through hydrogen bonds, the complexes formed Ca-O-H-O four-membered ring structure in the geometrical structures. It Shows that its stability are improved and not easy to contacts with O or reacting. It making coal spontaneous combustion can be well inhibition. After H₂O participating ligand, aromatic change had little effect in stability of the complexes. It shows that different ranks of coal can get better inhibition effect after H₂O participating ligand.

Abstract: In this paper curcumine was used to dye real silk with direct dyeing and mordant dyeing technologies and the dyeing performances of real silk were investigated. The obtained results indicated that the K/S value was 3.541 and the soaping and rubbing fastness were more than level 3 when the real silk was dyed for 45 min at 60°C under pH for 4.0 and the curcumine concentration for 1.6 g/L condition by direct dyeing technology. Compared with direct dyeing technology the soaping and rubbing fastness was more than level 4 when concentration of the iron or aluminum mordant was 5 g/L and real silk was dyed for 30 min at 60 °C by the mordant technology. The obtained results indicated that the dyeing performances of real silk were enhanced through the mordant technology. Keywords: Curcumine; Real silk; Dyeing performance; Direct dyeing; Mordant dyeing

Abstract: De-watered sludge (DS) and beer lees (BL) are mixed to be co-pyrolyzed into bio-char in this work. Bio-char was produced by heating at carbonization temperatures (550°C) with the ratio of DS to BL (1:1, 1.5:1, 2:1 and 4:1). Yield, ash content, FTIR, zeta potential and SEM of the bio-char were investigated. With temperature increasing, yield (39.4-57.3%, wt.%) decreased, while ash content (33.9-56.4%) increased in a high DS ratio, changing of the functional groups on bio-char (e.g., C=C, aromatic ring) in the co-pyrolysis process improve adsorption capacity for pollutant. Moreover, negative potentials (-10.583~-35.563 mV) of bio-char can provide breeding sites for microorganism and electrostatic attraction for heavy metal ions. The result showed this conversion could become a promising approach to dispose pollution problems, simultaneously, for the environmental remediation.

Abstract: A novel cement fluid loss additive P1301, which can resist high temperature and high salt content, was synthesized using the monomers of 2-acrylamido-2-methyl-propane sulphonic acid (AMPS), acrylic acid (AA), acrylamide (AM) and n-vinyl-2-pyrrolidone (NVP) by the method of aqueous solution polymerization. Through the orthogonal experiment find the optimum process: the ratio of monomers AMPS: AA: AM: NVP at 4:3:2:1, reaction PH at 11, reaction temperature at 60°C and reaction time about 4 hours. The IR spectrum show that the polymer with the structure of all the monomers. The aging test, thermal performance test and the fluid loss performance testing show that the forpolymers P1301 has an excellent thermal stability that can be used in 240°Cand strong salt tolerance. The fluid loss additive P1301 has an excellent tolerance to salt and high temperature.

Abstract: Industrially the epoxidation of soybean oil utilize peracids as oxidizing agents together with strong mineral acids as catalyst. To avoid the corrosive waste and undesirable epoxy-ring opening as well as polymerization under acidic conditions, new green catalytic processes in acid-free system have been paid great attentions in recent years. In this paper, MoO₃/Al₂O₃ simply prepared by impregnation method and mesoporous TS-1 prepared by one-pot hydrothermal method were evaluated as catalysts for the epoxidation of soybean oil with tert-butyl hydroperoxide. Orthogonal experiment design was used to optimize the reaction conditions for MoO₃/Al₂O₃ and the optimized conditions are as reaction temperature of 80°C, reaction time of 4h, the ratio of double bond to TBHP of 1:1.4, and the ratio of Ti to double bond of 1%. Higher than 55.8% of selectivity would be obtained. The synthesized meso-TS-1 displayed worse performance than expected result, only 27.6% of epoxy selectivity at conversion of 38.7%.