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Instrumental neutron activation analysis (INAA) was applied to sherds from the important site of Huating and, for comparison, several Neolithic sites in the valley of the Yellow River. We hoped to compare the compositions of two stylistically different ceramics found at Huating, and to evaluate the degree of compositional clustering and inter-site resolution that could be expected in an area that is noted for its extensive, and possibly very homogeneous, loess deposits. In addition, pottery sherds from Huating have been examined by microscopic petrography. All of these results will provide needed input in the planning of research towards the formation of a Neolithic/Shang Dynasty ceramic database for future use in archaeological research in China. [ABSTRACT FROM AUTHOR]

Abstract: In this paper, it was demonstrated that Y2O3 microprisms could be prepared by a mixed-solvothermal method with triethylene tetramine as precipitator and sequent heat treatment process. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopic (TEM) and high-resolution transmission electron microscopic (HRTEM) were used to characterize the products. The height of the Y4O(OH)9(NO3) microprisms is about 1.2μm and the length of the side of the bottom surface is about 0.6μm. It was found that the composition of solvent, dosage of triethylene tetramine, reaction time and reaction temperature had great effect on the morphologies of the final products. The as-obtained product via solvothermal process, monoclinic yttrium oxide hydroxide nitrate, Y4O(OH)9(NO3), could convert to Y2O3 with the same morphology after annealing at high temperatures. Eu3+ doped Y2O3 microprisms were also prepared and their photoluminescence (PL) properties were investigated. This method may be applied to prepare other rare earth oxides with complex structures. [Copyright &y& Elsevier]

In this Article, we report a remarkably simple and efficient method for the preparation of layered double hydroxides and graphene oxide (LDHs/GO) nanocomposites with varying GO amounts via a hydrothermal process. The graphene nature in the resulting LDHs/GO nanocomposites was confirmed by X-ray diffraction (XRD), Fourier transformed infrared (FTIR) spectroscopy, field-emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), N2 adsorption-desorption, and X-ray photoelectron spectroscopy (XPS). The LDHs/GO nanocomposites exhibited swelling behavior in water and forming a gel. The adsorption performance of the LDHs/GO nanocomposites was evaluated for the removal of arsenate (As(V)) from aqueous solutions, and the results showed that the ratio of GO to LDHs in the nanocomposites significantly affected the adsorption capacity. Higher and lower amounts of GO in LDHs/GO nanocomposites showed lower adsorption capacity of As(V). A maximum adsorption capacity of 183.11 mg/g (2.44 mmol/g) was achieved on the LDHs/GO containing 6.0% GO due to the higher Brunauer-Emmett-Teller (BET) surface area than other samples. Owing to their high uptake capability of As(V), water-swellable LDHs/GO nanocomposites are expected to have potential applications as adsorbents for As(V) polluted water cleanup.