[en] So as to change the conductivity and stationarity of NiO anode materials which was in lithium batteries, the precursors were synthesized through solvothermal measure and NiO/Ni/C composites were prepared by high temperature carbonization. The material composition was analyzed by a method named X-ray diffraction. The surface of the material was characterized through scanning electron microscopy and transmission electron microscopy, and applied to the negative electrode of lithium battery for electrochemical performance test. The results show that the NiO/Ni/C composite with pore structure has excellent performance and cycle stability in electrochemical tests. The NiO/Ni/O electrode still achieved a specific capacity of 743.7 mAh•g⁻¹ according to cycling 100 at 0.36 A•g⁻¹. (paper)

[en] In this paper, ZIF-8/ZIF-67 derived carbon (ZDC) was synthesized by surface modification technology and calculation process subsequently. In order to evaluate the feasibility of ZDC for antibiotic removal, the adsorption experiments were carried out by three typical antibiotics: tetracycline (TC), norfloxacin (NFO) and ofloxacin (OFO). The results showed that the maximum adsorption capacities of TC, NFO and OFO based on ZDC were 543.48, 239.8 and 340 mg/g, respectively. The adsorption capacity of ZDC was better than that of many other similar adsorbents, which is a potential adsorbent for antibiotic removal in the contaminated water. (paper)

[en] We report a novel rapid microwave synthesis of two-dimensional MoS₂. Morphological and structural characterizations were performed by XRD and SEM, which showed that the obtained MoS₂ was a sheet-like structure with good crystallization. The electrochemical performance illustrated that the MoS₂ electrode prepared with 0.0300 mol Na₂MoO₄ has a higher specific capacitance is 83.4 F g⁻¹ at 0.5 A g⁻¹, and favorable electrochemical durability up to 91.0 %, after 4000 cycles. (paper)

[en] Uranium containing radioactive wastewater is seriously hazardous to the natural environment if it is being discharged directly. Herein, nano-flake like Fe loaded sludge carbon (Fe-SC) is synthesized by carbothermal process from Fe-rich sludge waste and applied in the immobilization of uranium in aqueous. Batch isotherm and kinetic adsorption experiments are adopted to investigate the adsorption behavior of Fe-SC to uranium in aqueous. XPS analyses were conducted to evaluate the immobilized mechanism. It was found that the carbonized temperature played significant role in the characteristics and immobilization ability of the resulted Fe-SC. The Fe-SC-800 carbonized at 800 °C takes more advantageous ability in immobilization of uranium from aqueous than the commercial available AC and powder zero valent iron. The adsorption behavior could be fitted well with the Langmuir isotherm adsorption model and pseudo-second order model. The equilibrium adsorption amount and rate for Fe-SC-800 is high to 148.99 mg g"-"1 and 0.015 g mg"-"1 min"-"1, respectively. Both reductive precipitation and physical adsorption are the main mechanisms of immobilization of uranium from aqueous by Fe-SC-800.

[en] Highlights: • Both anion types and Cu²⁺ concentrations impact calcite dissolution. • Inhibited spreading rates at c_salt ≤ 0.1 mM result from the coverage of surface-active sites. • Ca-OH and ion pairs cause enhanced kinetics at 1 mM ≤ c_Cu2+ ≤ 10 mM. -- Abstract: Calcite dissolution, occurring in rocks, soils and sediments, is essential to indicate element cycles and local environments in the lithosphere, biosphere, hydrosphere and atmosphere. Calcite dissolution strongly depends on metal ions in aqueous solutions. Previous studies showed that aquatic Cu²⁺, a typical bio-toxic metal ion, can alter the calcite dissolution behavior. However, wide concentration ranges of Cu²⁺ coexisting with ubiquitous anions in local environments, such as waterways in the oxidation zones of copper deposits and soils near metal processing industry, was overlooked. When a considerable amount of aquatic Cu²⁺ ions are released into the environment, they migrate, diffuse, and hence become an environmental pollutant. Therefore, we focused on the interaction between calcite dissolution and wide concentration ranges of Cu²⁺-bearing solutions with different types of anions (SO₄²⁻, Cl⁻ and NO₃⁻). Comprehensive approaches including in situ atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), and density functional theory (DFT) calculations were employed to investigate kinetics and mechanisms of the interaction between the calcite (10.4) surface and Cu²⁺-bearing solutions. Results demonstrated that both anion types and Cu²⁺ concentrations dramatically affect calcite dissolution. The morphology of etch pits generated in CuSO₄ solutions can be fan-shaped but changed to tear-shaped in Cu(NO₃)₂ or CuCl₂ solutions. Calcite dissolution kinetics is inhibited at c_Cu2+ ≤ 0.1 mM, caused by the coverage of active sites on calcite surfaces. As the Cu²⁺ concentration increases (1 mM ≤ c_Cu2+ ≤ 10 mM), calcite dissolution kinetics is enhanced due to the coupling effect of Cu²⁺-incorporated surface structure and solution chemistry. These results revealed the interactive mechanism between calcite dissolution and the migration of toxic Cu²⁺ in waterways, provided a practical consideration in dealing with the local environment.