[en] Highlights: • GQD/PS-AER was prepared as a solid fluorescent sensor with millimeter size. • The GQD/PS-AER sensor could detect Fe"3"+ ions selectively. • The GQD/PS-AER sensor could be reusable. • This method is simple and economical. - Abstract: A novel solid fluorescent sensor with millimeter size, based on graphene quantum dots/polystyrenic anion-exchange resin (GQDs/PS-AER) was obtained for the detection of Fe"3"+. The linear response range of Fe"3"+ was obtained from 1 μM to 7 μM and the detection limit was as low as 0.65 μM. In addition, the sensor could be regenerated by adding complexing agent EDTA and be separated by using simple filtration.

[en] A novel copper nanoparticles were synthesized from cupric sulfate using hydrazine as reducing reagents. A series of aromatic nitro compounds were reacted with sodium borohydride in the presence of the copper nanoparticles catalysts to afford the aromatic amino compounds in high yields. Additionally, the catalysts system can be recycled and maintain a high catalytic effect in the reduction of aromatic nitro compounds

[en] We report a facile combustion method synthesis of reduced graphene oxide/CuI composites as a photocatalyst, in which CuI nanoparticles were homogeneously distributed on the surface of reduced graphene oxide (rGO), showing a good visible light response. The rGO-supported and unsupported CuI hybrids were tested over the photocatalytic reduction of CO₂ for methanol evolution in visible light. In the current study rGO-CuI composites have shown excellent yields (19.91 μmol g-cat⁻¹). rGO provides a light-weight, charge complementary and two-dimensional material that interacts effectively with the CuI nanoparticles. - Graphical abstract: A facile reduced graphene oxide（rGO）/ CuI nanoparticles complexes hybrid material was prepared by a naked flame. This method can be simple and rapid preparation of composite materials which exhibit excellent catalytic performance. It is not only can improve the light absorption but also can be highly efficient reduction of CO₂ to methanol in visible light. So the rGO-CuI composite will find potential applications as catalysts in organic photosynthetic reaction. Display Omitted - Highlights: • Reduced graphene oxide-CuI composites have been prepared by a facile method. • This method can produce reduced graphene oxide from graphene oxide without any reducing agent. • The absorption efficiency of rGO-CuI composites is significantly higher than rGO and CuI.

[en] A series of Ce-doped ZnO (Ce/ZnO) nanostructures were fabricated using the co-precipitation method, then a simply nontoxic hydrothermal approach was proposed for preparation of reduced graphene oxide (rGO)-Ce/ZnO composites. The synthesized composites were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), photoluminescence spectroscopy (PL), electrochemical impedance spectroscopy (EIS), UV-vis diffuse reflectance spectroscopy (DRS) techniques and Raman pattern. The as-synthesized rGO-Ce/ZnO composites showed high photodecomposition efficiency in comparison with the rGO-ZnO, Ce/ZnO, pure ZnO under UV, visible-light and sunlight irradiation. The degradation of methylene blue (MB) (10 mg/L, 100ml) by 95.8% within 60 min by using rGO-2 (10 mg) under sunlight irradiation was observed. The repeated use of the rGO-2 was investigated, and the results showed almost no decay in the catalytic activity

[en] In order to remove the fission product, such as strontium and cesium. The inorganic ion-exchangers, such as copper ferrocyanide (CuFe) and cobalt ferrocyanide (CoFe), were prepared and used for research. We have done some research on the preparation techniques and adsorption of cesium or strontium in the solutions. The result shows that the maximum static ion-exchange capability of CuFe for Sr and Cs are respectively 80 mg/g and 160 mg/g, the maximum dynamic ion-exchange capability for Sr and Cs are respectively 17 mg/g and 130 mg/g. The maximum static ion-exchange capability of CoFe for Sr and Cs are respectively 80 mg/g and 70 mg/g, the maximum dynamic ion-exchange capability for Sr and Cs are respectively 0.4 mg/g and 70 mg/g. (authors)

[en] Textured diamond films were deposited on (100) Si substrates via microwave plasma CVD (MWCVD) with bias-enhanced nucleation or without substrate bias. The samples were identified by means of scanning electron microscopy (SEM) and X ray diffraction (XRD) to be textured. The nucleation and growth process of textured diamond films were investigated, the mechanism of nucleation and growth were discussed

[en] The ultrasonic atomizing technique was used to add fixative to the analog device without human in-tervention. The simulation experiment on loose contamination was conducted by choosing the calcium carbonate powder as analog solid agent. And then, the encapsulated loose contamination was disturbed by fan along the direction parallel to ground to investigate the amount of loose contamination as well as the fixative vs. the re-suspension factor and particle size distribution. The results showed that the loose contamination deposited amount had a positive correlation on the re-suspension factor. The re-suspension factor decreased with the increasing amounts of fixative. When reaching a certain value, the effects were tiny by increasing the amount of fixative. For 1 mg·cm^-2 calcium carbonate powder, 0.57 kg·m^-2 fixative was necessary. According to the amount of loose contamination, an appropriate amount of fixing agent can effectively fix the loose contaminants and significantly reduce the re-suspension factor, which can reduce workers' exposure risk to radiation. (authors)

[en] Central Inner Mongolia (North China MARGIN middle) is the focus of hydrothermal type uranium deposits in the area, better uranium were found in recent years in the Archean Wulashan Group metamorphic rocks and Triassic granitemineralization clues. Type of granite, metamorphic pegmatite type, volcanic-type uranium mineralization in the area can be divided into containing host rock, including granite, metamorphic rock type of the area's major mineralization types, and also the area Next prospecting direction, focus on prospecting area includes the Triassic Dadongshan pluton, northern Sanyuanjin of Siziwangqi after the Houershanl Chayouzhongqi the Archean package pull Hills development area. Prospecting prospecting model should break through the existing emphasis on basic geological work. (authors)

[en] Highlights: • Protons have a dominant role in the dissolution process of biotite (0 0 1) surface. • Organic (carboxyl) acts as a catalyst under weakly acidic soil condition. • Biotite dissolution starts from defect sites and develops along [h k 0] direction. • Secondary coating on (0 0 1) surface would hinder the etch pits formation. - Abstract: The aim of this study was to investigate the dissolution and transformation characteristics of phyllosilicate under low molecular weight organic acids in the farmland environment (pH 4.0–8.0). Changes of dissolution and morphology of biotite were evaluated using chemical extraction experiments and in situ/ex situ atomic force microscopy (AFM) with fluids of citric acid (CA) solution at pH 4.0, 6.0, and 8.0. Results of extracting experiments show that CA solutions contributed to the release rate of potassium (K), silicon (Si), and aluminum (Al) from biotite relative to a control aqueous solution. In situ AFM observations indicate that the dissolution of biotite from the biotite (0 0 1) surface occurred on the terrace, segment, and fringe of pits, while new etch pits did not readily form on biotite (0 0 1) surfaces in aqueous solutions. However, dissolution rates of terraces can be greatly accelerated with the help of citrate. In pH 4.0 CA solution, 70 min dissolution reactions of biotite (0 0 1) surfaces result in more etch pits than in pH 6.0 and 8.0 solutions. In addition, the transformation of biotite occurred simultaneously with the dissolution process. Secondary coating was observed on the biotite (0 0 1) surface after 140 h of immersion in a weak acid environment. Thus, the protons have a dominant role in the dissolution process of biotite with organic (carboxyl) acting as a catalyst under acidic condition. Based on the theory of interactions on a water–mineral interface in a weak acid environment, dissolution of biotite starts from defect/kink sites on the surface, one layer by one layer, and develops along the [h k 0] direction. A secondary coating that forms on the biotite (0 0 1) surface may restrain the formation and growth of etch pits, whereas this process may have a positive role on the stability of soil structure during long-term soil management

[en] The waste liquid, which was produced in the process of alkaline foam decontaminating technology, could flow into the existing radioactive waste treatment system after pretreatment due to high levels of organic matter and strong foam capacity. The technique of ozonation was adopted. The orderliness of foam variation and the degradation of organic matter was researched preliminarily in this study. According to the results of experiments, ozone-oxygen mixture could effectively deal with the organic matter. The existence of foam was benefit to the degradation of organic matter. The degradation level of organic matter per gram of ozone and the degradation rate of organic matter were positively followed by the sum volume of foam in the existence of foam. Small aperture aeration set and lower ozone concentration were benefit to the sum volume of foam, the effect of aeration set was obvious, and the effect of ozone mixture flow was small. Different aperture set combined-condition process could increase the sum volume of foam, nevertheless the general effect was not important. With the ozone doses increase, COD of the system became lower and lower, when the degradation rate of COD was 80% with 1.5 ozone surplus coefficients, it increased slowly. (authors)