The reliable detection of environmental contaminants can correctly forecast the degree of environmental pollution that has occurred, which contributes to improving the environmental purification rate and maintaining the ecological balance. Herein, a novel hierarchical biomimetic catalysis MnO₂@CuAl-CLDHs was designed and synthesized using a facile method, which exhibited significantly enhanced peroxidase-like activity due to the unique composition and hierarchical mesoporous structure. Under optimized operational conditions, a visible colorimetric array based on the superior nanozyme activity of MnO₂@CuAl-CLDHs was developed for the quantitative determination of hydroquinone with a wide linear detection range (1–100 μM) and a low detection limit (0.183 μM). Simultaneously, our presented strategy could analyze hydroquinone in real water samples with high accuracy. Therefore, the bimetallic co-catalyzed nanozymes are expected to be the perfect replacement for natural enzymes to develop convenient and efficient sensors.

Given the serious harm of toxic phenol to human health and the ecological environment, it is urgent to develop an efficient, low-cost and sensitive nanoenzyme-based method to monitor phenol. MOF-derived nanozyme has attracted wide interest due to its hollow polyhedra structure and porous micro-nano frameworks. However, it is still a great challenge to synthesize MOF-derived multimetal synergistic catalytic nanoenzymes in large quantities with low cost. Herein, we reported the synthetic strategy of porous hollow CA-CoNiMn-CLDHs with ZIF-67 as templates through a facile solvothermal reaction. The prepared trimetallic catalyst exhibits excellent peroxidase-like activity to trigger the oxidative coupling reaction of 4-AAP and phenol in the presence of H₂O₂. The visual detection platform for phenol based on CA-CoNiMn-CLDHs is constructed, and satisfactory results are obtained. The K_m value for CA-CoNiMn-CLDHs (0.21 mM) is lower than that of HRP (0.43 mM) with TMB as the chromogenic substrate. Because of the synergistic effect of peroxidase-like activity and citric acid functionalization, the built colorimetric sensor displayed a good linear response to phenol from 1 to 100 μM with a detection limit of 0.163 μM (3σ/slope). Additionally, the CA-CoNiMn-CLDHs-based visual detection platform possesses high-chemical stability and excellent reusability, which can greatly improve economic benefits in practical applications.

The preparation of glass–ceramics with red mud and steel slag can not only solve the pollution problem caused by industrial waste slag but also produce economic benefits. It is difficult to analyze the high-temperature melt with the existing test methods, so the simulation experiment with molecular dynamics calculation becomes an important research method. The effects of steel slag content on the microstructure of red mud glass–ceramics were studied by molecular dynamics method. The results show that the binding ability of Si-O, Al-O, and Fe-O decreases with the increase in steel slag content. The number of Si-O-Si bridge oxygen increased gradually, while the number of Al-O-Al, Al-O-Fe, and Fe-O-Fe bridge oxygen decreased significantly. The number of tetrahedrons [SiO₄] increased, the number of tetrahedrons [FeO₄] and [AlO₄] decreased, and the total number of three tetrahedrons decreased. The mean square displacement value of Si⁴⁺ and O²⁻ increases first and then decreases, resulting in the viscosity of the system decreasing first and then increasing. The molecular dynamics method is used to analyze the structure of red mud–steel slag glass–ceramics on the microscopic scale, which can better understand the role of steel slag and has guiding significance for the experiment of this kind of glass–ceramics.

Ca₂Si was successfully synthesized via a high-temperature melting furnace and a spark plasma sintering process, allowing its thermoelectric properties to be studied. High-temperature melting furnaces were utilized to inhibit the volatilization of Ca elements during the preparation stage, ensuring the production of high-purity Ca₂Si. The resistivity of Ca₂Si increased gradually with rising temperature and reached 12 mΩ·cm at 873 K, demonstrating semi-metallic characteristics. In the temperature range of 323 K–873 K, Ca₂Si displayed relatively low total thermal conductivity, from 1.1 to 1.7 W·m⁻¹·K⁻¹. Nevertheless, Ca₂Si attained a maximum thermoelectric figure of merit (ZT) of 0.1 due to the atypical behavior and electrical properties of semiconductors. In contrast, Mg₂Si achieved a ZT value of 0.32 at 873 K, owing to its exceptional Seebeck coefficient.

The development of electrode materials that combine high scalability with outstanding electrochemical performance is crucial for advancing lithium-ion battery technologies. Among various anode material systems, bimetallic organic frameworks have attracted extensive attention due to their ability to provide additional active sites and generate significant synergistic enhancement effects through the introduction of two distinct metal centers. However, their practical application in lithium-ion batteries is hindered by limited electron transport and insufficient structural stability during cycling. Therefore, we adopt a photoredox strategy to in situ deposit Ag nanoparticles on the surface of FeCo-MOF and successfully fabricated the Ag@FeCo-MOF composite anode material. The excellent electrochemical performance is primarily attributed to the high specific surface area of the MOF carrier and the synergistic effect of the bimetallic active sites. Meanwhile, the successful loading of Ag nanoparticles has constructed an efficient three-dimensional conductive network, increasing electronic conductivity by 100 times and significantly accelerating electron transport kinetics. Electrochemical tests indicate that the initial discharge specific capacity of Ag@FeCo-MOF is 534.2 mAh/g at a current density of 500 mA/g, with Coulombic efficiency exceeding 98%. After 500 cycles, the discharge capacity remains at 513.9 mAh/g without significant decay.