Chemical Engineering and Material Properties III

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Authors: Shan Li, Hua Hong Wu, Guo Jie Xu, Xiu Feng Xiao
Abstract: We successfully developed a facile synthetic way to 3D hollow HAp microspheres. We used Ca (NO3)2 and (NH4)3PO4 as materials, hyperbranched Gemini surfactant (PCD) as template.We used some techniques to characterize the products,such as X-ray powder diffraction (XRD), Fourier transform infrared spectroscope (FT-IR), Scanning electron microscopy (SEM) and Thermal gravimetric analysis (TG).The effects of the Gemini surfactant concentration on the morphology and crystal degree of the samples were analyzed.We proposed a possible growth of mechanism.The product morphology could vary from rod to hollow sphere by adjusting the template concentration.When the template concentration was low,ball-like hydroxyapatite preliminary formed.With increasing the template concentration,the crystal degree of products declined. While the spherical cluster composed of numbers of flake or needle architectures were appeared. The results show that when the mass fraction of template is 0.01%,we can product uniform well-defined hollow spherical hydroxyapatite with semidiameter about 1.5μm.
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Authors: Jin Ling Guo, Xiao Ping Yu, Ya Fei Guo, Tian Long Deng
Abstract: Sample pretreatment techniques for arsenic speciation analysis in biosamples are of significant importance in detection procedures. In this paper, several typical pretreatment techniques such as solvent extraction (SE), enzymatic hydrolysis (EH), pressurized liquid extraction (PLE), solid phase microextraction (SPME) and liquid phase microextraction (LPME) were summarized on the basis of 20 references. The new trend in the future was also carried out.
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Authors: Ri Hong Tan
Abstract: To sdudy the chemical constituents in root of Astragalus membranceus. Compounds were separated and purified by polyamide column and silica gel column. seven compounds (I--VII) were obtained from the root of Astragalus membranceus:Sucarose (I), β-Sitosterol (II), Formnonetin (7-hydroxy-4-methoxyiso-flavove III), Calycosin (7,3-dihydroxy-4-methoxyisoflavove IV). Their structures were identified On the base melting point, value of Rf, spectral methods. Compounds III and IV are first isolated from the root of Astragalus membranceus. Compounds I,II,V, VI and VII are Compounds are isolated from the root of Astragalus membranceus.
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Authors: Chang You Song, Ai Bing Wu
Abstract: In this paper, graft copolymer of starch-acrylamid-propylene hydroxamic acid was synthesized by inverse emulsion polymerization. Effects of the dosage of the graft copolymer, pH value and reaction time on the capability of trapping heavy metal ion Pb2+ were investigated. The results showed that the optimum conditions for treating lead-containing wastewater were: pH=7-9, reaction time≧30min , the dosage of polymeric ferric sulfate and graft copolymer in wastewater were 10mg·L-1 and 250-300mg·L-1, respectively. The Pb2+ removal rate is not less than 99.8% and meanwhile the copolymer possess good removal performance of turbidity.
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Authors: Yong Ming Luo, Yong Dong Luo, Fang You Chen, Hua Liu
Abstract: Cinnamomum bodinieri Levl is a fast-growing species in tropical forests and widely distributed in southern China, Rich essential oil is in the leaves, which can be utilized as folk medicine. The chemical constituents of the essential oil obtained from the leaves of Cinnamomum bodinieri Levl were analyzed by GC-MS-DS. Sixty-three constituents were identified in the essential oils and the main constituents of the essential oils were terpinoids. The principal components are (content): camphor (40.81%), cineole (24.87 %), α-terpneol (8.75%), β-pinene (5.17 %), α-caryophyllene (2.17 %), caryophyllene (2.14 %), α-pinene (1.57 %), p-menth-1-en-4-ol (1.28 %), germacrene D (1.18 %).
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Authors: Tao Chen, Ying Chen, Yin Zhou, Hong Chen
Abstract: Using the first-principles calculations within density functional theory (DFT), we investigated the electronic and magnetic properties of (100) surface of inverse Heusler alloy Mn2CoSb with five different terminations. Our work reveals that the surface Mn atom moves to vacuum while surface Co atom moves to slab. Moreover, duo to the reason that the surface atom lost half of the nearest atoms with respect to the bulk phase, resulting in the decrease of hybridization, the atom-resolved spin magnetic moments of surface atoms are enhanced. Further investigation on DOS and PDOS showed that half-metallicity was preserved only in SbSb-termination while was destroyed in MnCo-, MnSb-, MnMn-, and CoCo-termination due to the appearance of surface states.
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Authors: Li Liu, Li Hai Cai, Dan Liu, Jun Xu, Bao Hua Guo
Abstract: The poly (butylene succinate) (PBS) and 3 wt% attapulgite (ATP) reinforced PBS/ATP nanocomposites with 1,6-hexanediol were fabricated using an in situ polymerization method. The crystallization behaviors indicated that ATP had effectively acted as nucleating agent, resulting in the enhancement on the crystallization temperature. The SEM results showed a superior interfacial linkage between ATP and PBS. Also, ATP could disperse as a single fiber and embed in the polymer matrix, which resulted in the improved mechanical properties.
381
Authors: Jie Deng
Abstract: Design a set of practical and effective hydraulic cavitation experiment device, hydraulic cavitation reactor, using porous plate for nitro phenol solution to simulate wastewater, respectively in different cavitation number initial pH value, initial concentration of the waste water, waste water, the cycle time, use different types of porous surface processing and analysis, through the experimental research, it is concluded that these factors and the relationship of nitro phenol degradation rate.
385
Authors: Y.H. Zhou, L.L. Zhou, X.H. Qiu, Y.L. Peng
Abstract: The transport properties of transition metal atoms interfered alpha-graphyne nanoribbon systems are investigated by first-principles calculations combined with the Keldysh nonequilibrium Green’s method. In all, five types of configurations are considered. We find that intervention of three Cr atom in alpha-graphyne nanoribbon systems decreases the conductivity of the system. Further study show that the magnetic direction of the electrode infulence the spin filtering effect greatly, while the ralative magnetic direction of the three transition Cr atoms have little effect on the transport properties. At finite bias window, negative differential resistance happens. Proper analysis are given to explain the spin filtering phenonmenon and the different transport properties via transmission coefficient and projected density of states.
389
Authors: Zeng Xin Li, Xu Yi Zhou, Tang Bin Kuang, Zhong He Tian, Qiang Liang
Abstract: The chitosan with the deacetylated degree 95%was mixed with the diatomite in the mass ratio of one chitosan to one point two diatomite to prepare the solid adsorbent for the sorption of the copper wastewater, which was based on the abilities of diatomite to adsorb cations and chitosan to chelate with metal ions. The absorbance of copper ions that were adsorbed before or after the adsorption can be measured at wavelength of 600nm by using spectrophotometer model 722, and both of the adsorption efficiency and capacity can be calculated then. The parameters to influence the adsorption of copper were studied under such conditions as different pH, concentrations, sizes, the sorption temperature and the sorption time. The results show that the adsorption efficiency can reach to 84.3% for 1L copper solution of concentration 0.8mol/L when 1g adsorbents are used at 27°C ,the value of the pH 6 and the sorption time for 1 hour. The cost of the adsorbent is low and it not only could be used to control the pollution of industrial copper wastewater but also provides references to the treatment of other heavy metal wastewater.
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