Chun Jie Yan

The Synthesis and Characterization of the Graphene Oxide Covalent Modified Phenolic Resin Nanocomposites

Graphene oxide (GO) was made by a modified Hummers method. Graphene oxide modified phenolic resin nanocomposites (GO/PF) were prepared by Steglich esterification, catalyzed by dicyclohexyl carbodiimide and 4-dimethylaminopyridine. The composites were characterized by Fourier transform infrared spectrometry, differential scanning calorimetry, X-ray powder diffraction, and scanning electron microscopy. The result revealed that the graphene oxide was absolutely exfoliated and covalent linked GO/PF composite was obtained. The thermal stability of PF is remarkably improved by modification with GO.

The Synthesis and Characterization of the Graphene Oxide-Polyamine Composites Using for the Recovery of Heavy Metal Ions

Graphene oxide–polyamine composites have been synthesized which have metal ion capacities as high as 97.94% for cadmium ions removed from aqueous solutions. The chemical structure of obtained graphene oxide–polyamine composites was confirmed by FT-IR, XRD and SEM. The results revealed that these composites can effectively extract heavy metal ions from waste water. Using these composites the concentration of heavy metal ions is reduced to below allowable discharge limits and the recovery of heavy metal ions from waste water was realized.

The Study on the Reverse Atom Transfer Radical Polymerization of MMA Catalyzed by Acetylacetonate Cobolt(II) Complex Supported by Ionic Liquid

An ionic liquid supported catalytic system, chloromethylimidazole acetylacetonate Cobolt(Ⅱ) was successfully used in the RATRP of methyl methacrylate. The chemical structure of obtained PMMA was confirmed by FT-IR and 1H NMR. The polymerization process in the presence of ionic liquid was thoroughly investigated. The results revealed that this kind of initiator and catalyst system could promote RATRP of MMA with the desired characteristics, and the RATRP proceeded in a controlled manner as evidenced by kinetic studies.

Magnetic Properties of Low Grade Manganese Carbonate Ore

Rapid reduction roasting of low grade manganese carbonate ore by coal and biomass fuels from Hunan, China was investigated. Magnetic separation behaviors and magnetic properties of raw manganese ore and roasted manganese ores were analyzed. After reduction by coal and biomass fuels, the manganese ores demonstrate a new Mn-Fe oxide phase, showing obvious mixed magnetic behaviors of ferromagnet and paramagnet, and the magnetic susceptibilities of roasting ores rapidly increase to almost two orders of magnitude in comparison of the raw ores. The results show that magnetizing roasting technology could enhanced the magnetic properties of the manganese ores about two orders of magnitude higher than raw manganese ore at low roasting temperature. Thereby, we deduce that the weak magnetic separation combined with high magnetic separation could be adequate for roasted manganese ore to satisfy the requirement of electrolytic manganese industry. Application of biomass in manganese ore roasting process is promising to the effective use of biomass and for decreasing the consumption of fossil fuels in the manganese industry.

Preparation of Monodisperse Functional Polystyrene/Silica Microsphere Composite via Suspension Polymerization Method

The monodisperse functional Polystyrene/Silica (PS/silica) microsphere has been successfully prepared via suspension polymerization followed by the modified silica composite phenylethylene method. The FTIR, SEM, EDS and BEI were used to characterize the structure and composition of monodisperse functional PS/Silica microspheres. The results indicated that the dosage of silica modifier affect the compatibility of the modified silica and phenyl ethylene. The several modified silica would synergistically impact on the morphology and performance of products corresponding to distinguish formation mechanisms. The thermal stability and compressive strength performance had been improved compared with polystyrene (PS).The weight loss of PS/Silica microspheres were less than polystyrene (PS) which weightlessness ratio is 96.92 wt %. The compressive strength of PS/Silica microspheres was almost two times as many as pure PS microspheres. The formation mechanism of monodisperse functional PS/Silica microsphere was developed ahead according to the results of FTIR, SEM, EDS and BEI under various polymerization conditions.

Study on Treatment of Ammonia Nitrogen Waste Water by Zeolite-Granule-Adsorbent

This paper focuses on the zeolite-granule-adsorbent(ZGA)’s efficiency of removing ammonium ion. The ZGA shows good performance with up to 73.41% for ammonium removal on the condition of ZGA loading 6g, contact time 6h, initial ammonium concentration 50 mg/L and pH=6. The adsorption kinetics is best approximated by the pseudo-second-order model, whereas the adsorption isotherm results indicated that Langmuir model provides the best fit for the equilibrium data. Furthermore, with regard to thermodynamic parameters, it was found that Gibbs free energy change (ΔG°) −19.31kJ/mol at T=298K, The negative data indicates the spontaneous nature of the adsorption process.

Facile Preparation of the Single Crystalline In2S3 Nanosheets with Highly Efficient Photocatalytic Activity

The single crystalline In2S3 nanosheets with highly efficient photocatalytic activity have been controllably synthesized via a facile hydrothermal process without adding any surfactant. The morphologies of the nanosheets were characterized by SEM and TEM. The results show the diameter of the nanosheets ranges from 100nm to 400nm. The photocatalytic decomposition of methyl orange on the catalyst shows it has much higher photoactivity than that of nanoTiO2 which means it may be more capable to be used as photocatalyst in decomposition of organic pollutants.

The Research of Oil-Shale-Dreg in Preparing Petroleum Proppant

The oil-shale-dreg is the wastes after refining the oil shale to obtain the shale oil. But in the oil-shale-dreg, there are the massive mineral component, like the quartz, the feldspar, the clay ingredient and so on. After calcined, its structure becomes loose, owning the very low density and much ignition loss. In our study, we use different rate of oil-shale-dreg, bauxite and flux for granulation by using disk granulator. After high temperature we get low density Petroleum Proppant. The proppants have the high strength and the high flow conductivity. That is satisfied the national standards by adding 30% wt solid waste oil-shale-dregs residue to the bauxite.

Study on CO 2 Adsorption of Sepoilite Modified by Mixture of Ethanolamine and N, N-Dimethyl Ethanolamine

Sepoilite was surface-modified by the mixture of ethanolamine and n, n-dimethyl ethanolamine. The XRD, SEM, FT-IR, BET and TGA were used to characterize the material structure and the adsorption property in CO2. The results showed that the weight percentage of CO2 adsorption rose from 4.01% for pure sepoilite to 19.28% for the modified sepoilite at room temperature.

Contrastive Study on Mineralogy of Brazil Kaolinite and Beihai Kaolinite

In this paper, the mineralogical characteristics of Brazil kaolinite and Beihai kaolinite have been researched. The structure and performance of samples were systematically analyzed by X-ray diffraction (XRD), scanning electronic microscopy (SEM) and transmission electron microscopy (TEM).The results showed that Brazil kaolinite had inerratic pseudo-hexagonal morphology, low diameter-thickness ratio and a Hinckey index of 1.501. While Beihai kaolinite has irregular-polygonous morphology, higher diameter -thickness ratio and a Hinckey index of 1.197. The differences in structural make them have different physical properties.