Abstract: Taking Ce (NO3)3•6H2O as cerium source, CeO2 nanosheets, CeO2 nanorods and CeO2 nanotubes were prepared using hydrothemal process. Characterization of chemical structure and surface properties for these materials was carried out and their efficacy in the catalytic ozonation degradation of wastewater was investigated. The results showed that the surface morphology and reaction conditions played great role in the removal of organic compounds. It was found that the CeO2 nanotubes showed superior catalytic activity. When 0.5 g of CeO2 nanotubes and 15 mg/min of ozone were applied in catalytic ozonation, the mineralization rate reached 97% after 2 h treatment for 1 L of model wastewater containing lemon yellow with 100 mg/L TOC.
Abstract: To gain good environmental reagent with no or lower phosphor in controlling corrosion and scale inhibition. We have researched the following contents: On the base of the conventional oxidation method, microwave radiation was used to the three oxidation process: DAPS (namely dialdehyde potato starch) was made with potato-starch oxidated by NaIO4, then carboxylated to make Carboxyl Potato Starch (CPS), furthermore, phosphorylated to obtain Oxidation Phosphate Potato Starch (OPPS), and researched the properties of controlling corrosion and scale inhibition of OPPS with or without microwave loading. And draw the following results:Not only was the oxidation rate of OPPS increased by microwave loading, but also the whole oxidation time was shorten from Sixteen hours and thirty minutes to one and half an hour comparing with the conventional oxidation way without microwave loading. Furthermore, the crustation inhibitor rate of OPPS to incrustant formed by calcium carbonate reached over ninety percent when temperature changed from seventy to eighty degrees, and the controlling corrosion rate of OPPS to brass H62 and Carbon-steel Q235 reached over ninety percent when the concentration of OPPS was altered from 120 to 200 milligram per litre, which were all higher than that of the contrast team. Moreover, the phosphorus content of OPPS is poor than that of the other universal reagents such as HEDP (namely two hydroxy ethidene phosphonic acid) and ATMP (namely amino three methylene phosphonic acid).
Abstract: The paper is about synthesizing the 2-ethylhexyl nitrate (2-EHN) with nitric acid and 2-Ethyl hexanol as raw materials and sulfuric acid as catalyst in a micro-channel reactor. The best synthetic conditions were determined under experiments: 1:2 for the mole ratio of nitric acid and sulfuric acid; 1:1 for the mole ratio of nitric acid and 2-Ethyl hexanol, the optimal liquid hourly space velocity is obtain as 4000h-1. In this condition, The yield and purity of EHN are Relatively high. This method is simple in process, mild conditions, safe, reliable and low energy consumption, providing the theory basis for industrialized production.
Abstract: Aim: BMSCs cultivation in vitro under three-dimensional (3D) dynamic conditions. Methods: a novel bioreactor system without shear stress acting on cells was developed by the combined use of collagen gel, hollow fiber membranes (HFMs) and air-lift loop bioreactor (ALB). During the expansion period, the cell growth curves were measured and after 7 days, the cell viability and morphology were assayed by fluorescence staining microscopically. Moreover, the BMSC characters of expanded cells were identified by specific expressions of CD29, CD34, CD44 and CD45 and by multilineage differentiation into osteoblasts, chondrocytes and adipocytes. Results: the cultured BMSCs expanded about 17-fold under dynamic condition, 13-fold under static condition with the initial density of 5×105 cells·mL-1; after 7 days, the cells maintained high viability of about 92% and spread with a spindle appearance and long cell protrusions in gel; the expanded cells were CD29 and CD44 positive, CD34 and CD45 negative, and they could differentiate into osteoblasts, chondrocytes and adipocytes; the cells expanded under dynamic condition spread more and showed stronger multi-differentiation potentials.
Abstract: Neutral PBDEs congeners and their corresponding radical anions were studied with the pseudopotential method of stuttgart group (SDD) effective-core potentials basis set for the bromine atoms and the all-electron basis set for all other atoms. The pseudopotential method can be used for compounds containing heavy elements with relativistic effects and can reduce the computational time. The quantitative structure property relationship (QSPR) study was also performed in this work to develop models to predict the normolized reaction rate constants for the reductive debromination of polybrominated diphenyl ethers (PBDEs) by zero-valent iron (ZVI). The partial least squares regression (PLSR), principal component analysis-multiple linear regression analysis (PCA-MLR), and back propagation artificial neural network (BP-ANN) approaches were employed for the QSPR study between the molecular descriptors and the logarithm of normalized reaction rate constants of fourteen selected BDE congeners. The results show that the ANN models could be more satisfactorily to predict the rate constants than the PLSR and PCA-MLR models.
Abstract: A novel aminotriacetic acid (NTA) intercalated MgAl-LDHs have been successfully synthesized by anion exchange method with MgAl-NO3-LDHs as precursor. The XRD pattern implies that NTA anions have replaced NO3- in the interlayer of LDHs. The FT-IR spectra also indicates that NTA anions have intercalated into layers’ space of LDHs, and the carboxyl groups of NTA have been converted into carboxyl anions after intercalation process. When comparing IR spectra of MgAl-NTA-LDHs and MgAl-CO3-LDHs, higher and stronger absorption was observed in the range of 1428-1250 cm-1, especially in the range of 1111-909 cm-1.
Abstract: The lactose content in the raw milk by colorimetry was introduced in the paper.On the single-factor experiment basis, it used response surface methodology to establish a quadratic mathematical model of lactose content. After analyzing the significance of the various factors and interactions, the results showed the optimum extraction conditions of detecting lactose content by colorimetry were as follows: reaction temperature 100°C, reaction time 5.2min, amount of precipitation 2.9 mL. In order to verify the method’s accuracy, five kinds of raw milk were chosen to test. The results showed the recoveries were between 97.122%-101.294%, so it is feasible to determine the content of lactose in raw milk.
Abstract: A new supramolecular compound, [Co (en)3]2[H3PMo8V6O42]∙5H2O (1) has been hydrothermally synthesized and structurally characterized by the elemental analysis, IR and single crystal X-ray diffraction. Compound 1 consists of [Co (en)2]2+ transition metal coordination fragment, [H3PMo8V6O42]4- building blocks and crystal water molecules, which are linked together via hydrogen-bonding interactions to form a new 3-D supramolecular networks. The degradation of methylene blue (MB) under UV-vis irradiation with 1 as the heterogeneous photocatalyst has been investigated, showing a good photocatalytic property of 1 for MB degradation.
Abstract: The effect of solvents on ethanolysis of SPC was investigated. Heptane, cyclohexanethe, ether and MTBE were selected because of their satisfactory propertities. Under the certain reaction conditions, ether and MTBE have an higher conversion of SPC and yield of GPC than the other two because of their slightly higher polar and lower viscosity.