New Journal of Chemistry最新文献

Cationic acridine dyes acted as a stabilizer for glucose oxidase adsorbed on a pencil graphite electrode and enhanced mediated bioelectrocatalysis for glucose oxidation. The order of the magnitude of the bioelectrocatalytic current was consistent with the binding constants estimated by fluorescence quenching and the binding energies estimated by docking simulation.

Selenization of ZrO₂ can be easily performed by stirring commercially available ZrO₂ in an in situ prepared NaHSe solution. The produced material Se@/ZrO₂ could catalyse oxidative alkene degradation reactions, which are key transformations in the industry. Control experiments confirmed that selenium loaded onto ZrO₂ endowed it with good catalytic activity for oxidation reactions. In comparison with the density of other selenized catalytic materials such as Se/C, selenized silica and selenized polylactic acid, the density of Se@ZrO₂ is higher. This feature makes it easy to precipitate from the reaction solution, facilitating its convenient recovery and reutilization.

Perovskite oxides are promising candidates for diverse applications due to their versatile physical and chemical properties. However, their structural and compositional flexibility significantly delay the traditional methods of screening formable and thermodynamically stable perovskite oxides. Single-label machine learning methods have been extensively used to solve this challenge, but these often result in the misselection of unstable perovskite oxides by formability prediction models and non-formable perovskite oxides by stability prediction models. Here, multi-label classification (MLC) methods are employed to simultaneously screen for both formable and stable perovskite oxides. We investigate the label dependency of formability and stability labels, finding significant unconditional dependency but little conditional dependency. Using a recursive feature addition method, 10 features are selected from an initial set of 159. SHapley Additive exPlanations (SHAP) analysis reveals that the atomic weight of B-site elements and the ionic radii ratio of the A-site to the B-site cations are the most important features. Among the eight MLC methods evaluated, the classifier chains (CC) model outperforms its counterparts. An optimized CC model achieves outstanding performance with a subset accuracy of 0.932 and a Hamming loss of 0.0342. This model is further generalized on 2226 virtual perovskite combinations, identifying 42 formable and stable perovskite oxides for future investigation. This work presents an effective approach for screening potential perovskite oxides, which can be further extended to other fields that involve predicting multiple properties concurrently.

A CuI@UiO-67-bpy (MOF II) catalyst was successfully synthesized by immobilizing a small amount of CuI onto the zirconium-based MOF (UiO-67-bpy, MOF I). Copper-doped CuI@UiO-67-bpy has an isostructural nature with the parent UiO-67 framework and a large surface area of approximately 1285 m² g⁻¹. Moreover, the material was thoroughly characterized using SEM, PXRD, TGA, FTIR, and XPS methods. The as-synthesized CuI@UiO-67-bpy catalyst can be an efficient heterogeneous catalyst for promoting C–H arylation of 1,3,4-oxadiazoles with aryl iodides and benzoxazoles or benzothiazoles with diaryliodonium salts. Furthermore, the catalyst was recoverable and reusable, maintaining a high catalytic activity even after three cycles. The combination of the advantages of both homogeneous molecular CuI catalysts and solid MOF structures in this system may bring new opportunities for the development of highly active heterogeneous copper catalysts for a variety of Cu-catalyzed transformations.

The excellent anti-interference ability of near-infrared (NIR) fluorescent materials derived from long-wavelength emission has made them one of the most fascinating fluorescence probes. In this work, gold nanoclusters stabilized with glutathione (GSH-AuNCs) were prepared and exhibited excellent NIR fluorescence at 806 nm, indicating their potential as excellent fluorescence probes. It is gratifying that S²⁻ could be sensitively and rapidly recognized through the “turn-off” strategy of NIR fluorescence of AuNCs. It is speculated that the quenching was due to the aggregation-caused quenching (ACQ) phenomenon. The combination of a longer wavelength emission of 806 nm and the strong binding ability of Au and S endowed the constructed sensing system with outstanding sensitivity and selectivity. A good linear relationship for the detection of S²⁻ was obtained in the range of 0–23.75 μM, with a limit of detection (LOD) of 14.67 nM (S/N = 3). This NIR fluorescence probe was successfully used for the detection of S²⁻ in real samples with satisfactory results.

Alpha-fetoprotein (AFP) is a characteristic marker of liver cancer, and its accurate detection is of great significance for the early detection of liver cancer. This study utilizes visible light as the excitation light source, employs electrochemical measurement, and incorporates the AFP aptamer as the biorecognition element to construct a photoelectrochemical (PEC) biosensor for the highly sensitive detection of AFP. A Z-scheme heterostructure is constructed via a two-step hydrothermal method, and CdS nanoparticles are anchored on TiO₂NRA and BiOI nanosheets with high specific surface areas. The photocurrent response of the BiOI/CdS/TiO₂NRA composite material is 4.5 times that of TiO₂NRA. By analyzing the energy band positions, the electron transfer mechanisms of Z-scheme heterojunctions in CdS/TiO₂NRA and BiOI/CdS photoactive materials were elucidated. Subsequently, the AFP aptamer was immobilized on the base electrode surface via the CN structure to fabricate a self-supporting sensing platform. The PEC biosensor demonstrates excellent detection performance within the linear range of 1 nM ∼ 250 nM, exhibiting high selectivity and the detection limit is 0.59 nM (S/N = 3). It has been effectively utilized for the detection of AFP in blood, providing a practical method for early detection and prevention of liver cancer, and also offering new insights for the design of other similar characteristic marker biosensors.

Scientists have focused more on the role of metal-based nanoparticles (MNPs) in sustainable agriculture. MNPs such as silver (Ag), zinc (Zn), cupper (Cu), iron (Fe), and titanium (Ti) nanoparticles and their oxides like FeO₂, CuO, TiO₂, and Al₂O₃ have been frequently utilised in agricultural fields. Green synthesis methods use nano-biotechnological advancements to minimize metal salts and stabilize MNPs. Conventional agriculture uses lots of fertilizers and chemicals that harm the environment. Sustainable agriculture protects many species and the ecosystem by using few agrochemicals. Sustainable agriculture includes low-input methods with lower production costs and higher net returns. Nanotechnology can improve agricultural inputs’ performance by using nanoparticles, protecting agro-ecosystems’ long-term growth. Nano-agrochemicals include nano-carrier systems coated with agrochemicals, nanopesticides, nanofertilizers, nanoherbicides, and other products. These products can improve crop productivity, prevent plant diseases, and eliminate weeds and insects to save money and energy and reduce waste. This review article covers the latest advances in MNPs for ecologically friendly agricultural nanotechnology and their potential for sustainable crop production, protection, and management.

The pollution of antibiotics in water resources was addressed by constructing an SBA-15@NU-1000 composite via a one-pot hydrothermal method, and the specimen was characterized using scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction, small-angle X-ray diffraction, thermogravimetric analysis, N₂ sorption isotherms as well as Fourier transform infrared and X-ray photoelectron spectroscopy. The amino functional group of SBA-15 contributed to its successful combination with NU-1000, and the doping ratio of SBA-15 affected the adsorption capacity of tetracycline. The SBA-15@NU-1000 composite not only exhibited a faster adsorption rate but also higher adsorption capacity than pure NU-1000. In particular, the equilibrium adsorption time for tetracycline decreased from 40 to 10 min, and the adsorption capacity for tetracycline increased from 356 to 424 mg g⁻¹. The superior adsorption performance of SBA-15@NU-1000 compared with that of NU-1000 was attributed to the amino functional SBA-15 directing the growth of NU-1000 on its outer surface, which minimized the particle size of NU-1000 and increased the production of adsorption sites. This study demonstrated the effectiveness of successfully combining a metal–organic framework (MOF) with a mesoporous silica support, either grown in the interior channel or on the exterior surface, to promote the adsorption performance of MOFs.

Hydroxylamine hydrochloride-catalyzed transamidation of primary thioamides with primary and secondary amines via C(S)–N bond cleavage and formation has been reported. Readily available primary thioamides are employed as substrates to convert desired secondary and tertiary thioamides using green and benign hydroxylamine hydrochloride as a catalyst. The utility of this approach has been demonstrated via excellent functional group tolerance and broad substrate scope, which is expected to be widely used in fields such as synthetic chemistry, pharmaceutical chemistry, etc.

The increasing global energy demands, rapid consumption of fossil fuels, and rising environmental crisis are all crucial challenges requiring immediate attention. Maximizing supercapacitor performance necessitates superior electrochemical performance and outstanding stability in the electrode materials. Altering the structural and electrochemical characteristics of transition metal selenides by substituting cations and subsequently hybridizing them with MXenes is a potential strategy for designing efficient supercapacitors. Herein, facile solvothermal technique was employed to synthesize cation-substituted CoMoSe₂ nanoparticles, which were subsequently hybridized with Ti₃C₂ before being employed as a supercapacitor electrode. This novel attempt to substitute molybdenum (Mo) in the CoSe₂ lattice and the subsequent hybridization resulted in a supercapacitor electrode that exhibited enhanced electrochemical properties owing to its improved charge transfer kinetics, multivalences, and enhanced active sites. The outstanding faradaic redox characteristics of the fabricated electrodes show remarkable pseudocapacitive behaviour within a potential range between −0.2 and 0.45 V. The developed electrodes in a standard three-electrode setup show a specific capacitance of 520 F g⁻¹ at a current density of 1 A g⁻¹, which is greater than that of pure CoMoSe₂ and mono-metal selenide CoSe₂. Over 5000 cycles at 5 A g⁻¹, the optimal CoMoSe₂@Ti₃C₂ electrode maintains 97.43% of its initial specific capacitance. Furthermore, the designed asymmetric supercapacitor device (ASC) exhibited exceptional performance and stability with an energy density of 73.7 W h kg⁻¹ at 740 W kg⁻¹ power density and 93.3% retention after 15 000 cycles. This work thus demonstrates that metal selenides are a suitable material for supercapacitors. Furthermore, the cation substitution and MXene hybridization could potentially be employed as performance-enhancing strategies.