SAC@Ni₂Co_0.95Mn_0.05-LDH displayed excellent cycling stability (83.76% after 50 000 cycles), making it well-suited for efficient wind energy storage and conversion with promising practical applications.

In this work, a diatomite@graphene@ZnO (ZGD) photocatalyst was synthesized by chemical vapor deposition and hydrothermal methods and used for the photocatalytic degradation of methylene blue. The characterization of the prepared nanocomposite was performed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction (XRD), and N₂ adsorption–desorption techniques. Ultraviolet-visible diffuse reflectance spectroscopy (DRS) showed that the prepared ZGD photocatalyst enhanced the absorption of visible light and induced a red-shift. Photoluminescence spectroscopy (PL) revealed that the recombination of electron and hole pairs can be effectively suppressed. Besides, the synergistic effect of diatomite and graphene avoids the agglomeration of ZnO, increases the number of surface adsorption sites, and limits the electron transport, consequently improving the photocatalytic activity of ZnO. When ZGD-3 was UV-irradiated (λ = 663 nm) for 90 minutes, the degradation effectiveness of methylene blue (MB) was 100%. After the fifth repetition, the photocatalytic degradation efficiency was always greater than 95%. Simply put, the ZGD nanocatalyst can be used as an efficient photocatalyst for dye wastewater treatment.

Metal–organic frameworks (MOFs) are regarded as self-sacrificial templates to prepare various transition metal-based electrode materials. However, there is still a lack of information on the electrochemical performance difference of MOF-derived hydroxides, oxides and phosphates in recent research. In addition, the rate capability is still a problem that hampers the application of MOF-based derivatives. Hence, it is necessary to choose suitable materials with outstanding electrical conductivity for MOF-based derivatives. In this study, a series of MOF-based derivatives, namely, Co-MOFs, NiCo-LDH (layered double hydroxide), NiCoO₂, NiCoP, SAC@NiCo-LDH and SAC@NiCoP were prepared by combining suitable methods such as ion exchange, hydrothermal processes, oxidation and phosphorization. The electrochemical performance of these samples at 1 A g⁻¹ was found in the order of SAC@NiCoP > SAC@NiCo-LDH > NiCoP > NiCo-LDH > NiCoO₂. SAC@NiCoP exhibits the best specific capacitance and cycling stability when compared with the remaining materials. Phosphating enhances the electrical conductivity, the layer structure facilitates the intercalation/deintercalation of electrolyte ions, and oxidation inhibits the release of electrochemical performance. Hence, the enhancement effect is arranged as follows: phosphorization > layer structure > oxidation. This work analyzes the performance differences of MOF-based materials with different modification methods and crystal structures carefully and provides reliable criteria for the design and screening of advanced electrode materials.

Over the past century, numbers of hydrometallurgical processing technologies have been conducted for gold leaching in mining and second resource, such as cyanidation, being with high toxicity and low reaction rate, and non-cyanide---thiosulphate leaching and thiourea leaching, etc, having relatively high reagent consumption. Recently, ammonium thiocyanate was selected as leaching reagent in the laboratory study. Just as some papers shown, thiocyanate can be complexed tightly with Au⁺ or Au³⁺ to form water-soluble complexes according to the dynamic and thermodynamic system of thiocyanate gold and regenerated or obtained as a by-product in technological processes. And the extraction process is affected by many factors, such as thiocyanate concentration, oxidant concentration, liquid-solid ratio, temperature, and reaction time, especially pH and the category of oxidants, which can be chosen properly to make the method extensively applied in industrialization. Recent studies have shown that the gold leaching with thiocyanate under alkaline conditions is also viable using oxygen as oxidant. Then this article compares and analyzes the use of different oxidants in acid or alkali environment reaching a 96% leaching efficiency and the techniques of gold recycle from thiocyanate gold solutions. However, as the restriction for post-processing cost of thiocyanate and the strict requirement for the equipment in the acidic conditions or high pressure conditions, additional research should be directed towards making incorporation with other extraction methods perfectly. Two development tendencies are presented in this paper: (1) as additive; (2) as the lixiviant under alkaline or neutral conditions.