Objective To establish an HPLC method for determine the content of AciPimox DisPersible Tab-lets. Methods The C18 column(4. 6 mm × 250 mm,5μm)was adoPted in the HPLC system with acetonitrile-0. 005 mol ·L-1tetrabutylammonium bromide(15:85)as mobile Phase at a flow rate of 1. 0 mL·min-1. The detected wavelength was 273 nm. Results The linear range was 20~120 μg·mL-1 and the regression coefficient was 0. 999 9. The recovery of this method was 98. 7% and RSD was 1. 3%(n=9). Conclusion The method was simPle,quick and reliable. It could be used for actual test and quality control of AciPimox DisPersible Tablets.

Hexamethyldisilazane was synthesized using chlorotrimethyldisilazane and ammonia gas as basic materials. Hexamethyldisiloxane and toluene were used as the mixed solvent in this study. The yield of hexamethyldisilazane was realated to the amount of hexamethyldisiloxane in the mixed solvent. The highest yield in this research was 93.53% when using pure hexamethyldisiloxane. This was 20 percents higher than the yield using pure toluene as reaction solvent. The mixed hexamethyldisilazane was distilled in the distilled tower. The final product was analyzed using gas chromatography. The purity of hexamethyldisilazane and hexamethyldisiloxane was higher than 99%.

The object of this work was to study the modified hectorite as effective adsorbent for Neutral Red (NR) from aqueous solution. The adsorbent capacity of modified hectorite was discussed. The effects of surfactant content, adsorbent content, pH and adsorption temperature on the sorption of NR on modified hectorite were studied. Experimental results showed that the equilibrium adsorption data fitted well with Langmuir isotherm and the adsorption capacity was 393.70 mg/g for the modified cetylpyridinium bromide hectorite (CPB-Hect). Kinetic studies showed that the dynamical data fitted well with the pseudo-second-order kinetic model. For thermodynamic studies, parameters such as the Gibbs free energy (ΔG0), the enthalpy (ΔH0) and the entropy (ΔS0) indicated that the adsorption process was spontaneous and endothermic in nature.

Some affecting factors including nitrogen oxides,absorbent cotton humidity of lead acetate,and temperature of absorption,on arsenic determination in complex system by Ag-DDC spectrophotometric method were studied in this paper.The results showed that the nitrogen oxides was difficult to be dispeled when using nitric acid to digest sulfide,which had negative interference on the arsenic determination.The hydrogen sulfide was absorbed much sufficiently by semi-dry absorbent cotton of lead acetate.The temperature of absorption liquid had also some interference on the determination,the absorbance decreasing with increasing temperature.

Organic modification on magnesium lithium silicate was carried out by cation exchange method using cetyltrimethylammonium bromide (CTAB),cetylpyridinium bromide (CPB),and octadecylamine (ODA) as organic modifiers.Synthesized samples were characterized by small angle X-ray diffraction (SAXD),FT-IR,TG,and SEM.Also,pore size distribution and specific surface area of the samples were measured.Experimental results showed that all of the three organic modifiers intercalated into the interlayer of magnesium lithium silicate and the interlayer spacing was increased.Especially,the interlayer spacing of ODA-magnesium lithium silicate increased to 2.09 nm.Besides,dispersibility of modified magnesium lithium silicate in organic solvents and polymer monomers was improved.

Two modified hectorites have been designed and synthesized by two cationic surfactants namely cetyltrimethyl ammonium bromide (CTAB) and octadecylamine (ODA) for selective removal of the anionic dye congo red (CR) from aqueous solution. The adsorbent capacity of modified hectorites was discussed and the optical contents of CTAB and ODA were 35% and 28%, respectively. Modified hectorites were characterized by X-ray powder diffractometer (XRD), Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The effects of adsorbents content and adsorption temperature on the sorption of CR on modified hectorites were studied. Experimental results showed that the equilibrium adsorption data fitted well with the Langmuir isotherm and the adsorption capacities were 182 and 197mg/g for the modified cetyltrimethyl ammonium bromide hectorite (CTAB-Hect) and ammonium bromide hectorite (ODA-Hect), respectively. Kinetic studies showed that the dynamical data fitted well with the pseudo-second-order kinetic model. For thermodynamic studies, parameters such as the Gibbs free energy (ΔG0), the enthalpy (ΔH0) and the entropy (ΔS0) indicated that the adsorption process was spontaneous and endothermic in nature.

The research progress of synthetic hectorite,organo-hectorite and their application are summarized in this paper.Hydrothermal crystallization and microwave synthesis of hectorite are discussed.The organic modification of hectorite is performed mainly by the in-situ method,ion exchange reaction and adsorption method.The dispersibility of the synthetic organo-hectorite in organic solution can be improved.Surface modifications of hectorite have received more and more attentions because it allows the creation of new materials and new applications such as adsorbents of toxic metals and organic pollutants in water,polymer-clay nanocomposites,catalysis,etc.

The advance in the research of Poly(methyl methacrylate)/layered silicate composite material at home and abroad was summarized in this paper.The structure and the modification of the layered silicate were mainly discussed.The structure of the PMMA/layer silicate,the method of analyzing and characterizing its structure,the mechanism and methods of its preparation,physical and chemical properties and the application of the materials were reviewed at the same time.Finally,the further developments of this new material were previewed at the base of our research.

Cu2(OH)2CO3 and CuO hierarchical nanostructures with variable morphologies were synthesized by controlled heating hydrated nanoparticles. The growth of nanostructures started with nanoparticles which formed loose aggregates. The nanoparticles within aggregates reorganized to form urchin-like structures which consisted of dense nanorods. With the growth of nanorods, regular microspheres were formed. At the same time, the nanorods coalesced to form wedge-like structures. The various surface subunits were just the outer display of wedge-like structures under different conditions. CuO nanostructures were gained by pyrolysis of malachite precursors. The attractive electrostatic force was responsible for aggregation of nanoparticles. During growth of aggregates, nanorods acted as growing tips which adsorbed adjacent nanoparticles. The Brownian motion was responsible for reorientation of nanoparticles to achieve low-energy configuration. Adsorbed water played an important role during formation of malachite nanostructures. The effect of growing environments on nanostructures was investigated. XRD, SEM, TEM and BET and so on were used to characterize the products.