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Intumescent flame retardants (IFR) are widely used in the field of flame retardant polypropylene (PP), but their flame retardant efficiency and smoke suppression properties need to be further improved. Herein, a Ni‐Al LDH (layered double hydroxide) is obtained successfully by coprecipitation and microwave hydrothermal technique and used as a synergist to improve the flame‐retardant and smoke‐suppression properties of triazine‐based IFR. The results showed that IFR/Ni‐Al LDH exhibited the best synergistic effect when the IFR is replaced by 5 wt% Ni‐Al LDH. 17 wt% IFR/Ni‐Al LDH enabled the PP composites to achieve UL‐94 V‐0 rating with a high LOI of 29.8%. Besides, the introduction of Ni‐Al LDH effectively decreased the heat and smoke release of the PP/IFR composites due to its catalytic charring effect. This is mainly attributed that the introduction of metal ions in Ni‐Al LDH effectively improved the strength and crosslinking degree of char layer and promoted the formation of a cohesive and dense char layer. The formed high‐quality char layer effectively exerted the barrier effect in condensed phase. Therefore, the PP/IFR/Ni‐Al LDH composites exhibited excellent flame‐retardant and smoke‐suppression performance. This investigation provided a facile way to prepare environment‐friendly and high‐performance flame retardant PP composites with wide application prospects. A Ni‐Al layered double hydroxide (Ni‐Al LDH) is synthesized successfully and used as a synergist to improve the flame‐retardant and smoke‐suppression properties of triazine‐based intumescent flame retardants (IFR). Only 17 wt% IFR/Ni‐Al LDH enables the PP composites to achieve UL‐94 V‐0 rating with a high LOI value of 29.8%. The PP/IFR/Ni‐Al LDH composites exhibit excellent flame‐retardant and smoke‐suppression properties.

Here, a new type of PEC aptamer sensor for bisphenol A (BPA) detection was developed, in which visible-light active MoS2/Ni-Fe LDH (layered double hydroxide) heterostructure and aptamer were used as photosensitive materials and biometric elements, respectively. The combination of an appropriate amount of MoS2 and Ni-Fe LDH enhances the photocurrent response, thereby promoting the construction of the PEC sensor. Therefore, we used a simple in situ growth method to fabricate a MoS2/Ni-Fe LDH sensor to detect the BPA content. The aptasensor based on aptamer/MoS2/Ni-Fe LDH displayed a linear range toward a BPA of 0.05–10 to 50–40,000 ng L−1, and it has excellent stability, selectivity and reproducibility. In addition, the proposed aptamer sensor is effective in evaluating real water samples, indicating that it has great potential for detecting BPA in real samples.

(1) Background: Mosquito control with essential oils is a growing demand. This work evaluated the novel larvicidal and adulticidal activity of fennel and green tea oils and their Layered double hydroxides (LDHs) nanohybrid against Culex pipiens (Cx. pipiens) in both laboratory and field conditions and evaluated their effect against non-target organisms; (2) Methods: Two types of nanoclays, MgAl-LDH and NiAl-LDH were synthesized and characterized using PXRD, TEM and SEM, whereas their elemental analysis was accomplished by SEM-EDX; (3) Results: Mg and Ni LDHs were synthesized by the co-precipitation method. The adsorption and desorption of active ingredients were conducted using LC MS/MS, with reference to the SEM-EXD analysis. The desorption process of MgAl-LDH intercalated green tea oil was conducted using ethanol, and reveled significant peaks related to polyphenols and flavonoids like Vanillin, Catechin, Daidzein, Ellagic acid, Naringenin, Myricetin and Syringic acid with concentrations of 0.76, 0.73, 0.67, 0.59, 0.52, 0.44 and 0.42 μg/g, respectively. The larvicidal LC50 values of fennel oil, Mg-LDH-F, and Ni-LDH-F were 843.88, 451.95, 550.12 ppm, respectively, whereas the corresponding values of green tea were 938.93, 530.46, and 769.94 ppm. The larval reduction percentage of fennel oil and Mg-LDH-F reached 90.1 and 96.2%, 24 h PT and their persistence reached five and seven days PT, respectively. The reduction percentage of green tea oil and Mg-LDH-GT reached 88.00 and 92.01%, 24 h PT and their persistence reached five and six days PT, respectively. Against adults, Mg-LDH-GT and Ni-LDH-GT were less effective than green tea oil as their LC95 values were 5.45, 25.90, and 35.39%, respectively. The reduction in adult density PT with fennel oil, Mg-LDH-F, green tea oil, and Mg-LDH-GT reached 83.1, 100, 77.0, and 99.0%, respectively, 24 h PT and were effective for three days. Mg-LDH-GT and Mg-LDH-F increased the predation Cybister tripunctatus (71% and 69%), respectively; (4) Conclusions: For the first time, Mg-LDH-GT and Mg-LDH-F was the best system loaded with relatively good desorption release to its active ingredients and significantly affected Cx. pipiens larvae and adults in both laboratory and field circumstances, and it could be included in mosquito control.

The catalytic performance of Ni/Al-carbonate-based layered double hydroxide (Ni-LDH) for methanol oxidation reaction (MOR) was investigated using spectro-electrochemical techniques. Ni-Al hydrotalcite containing carbonate anions was synthesized and characterized by XRD, SEM, FTIR, and Raman spectroscopy. A glassy carbon electrode modified with Ni-LDH (NLGC) showed optimal catalytic activity under alkaline conditions (pH 13). Cyclic voltammetry (CV) of NLGC exhibited anodic and cathodic peak current densities at 0.62 V and 0.42 V, corresponding to quasi-reversible redox behavior of Ni(II)/Ni(III) centers. The linear correlation of peak current with scan rate in the non-faradaic region (0.1–0.3 V) suggests an adsorption mechanism involving the Ni II -(OH) 2 /Ni III -OOH redox couple, while a square-root relationship indicates diffusion-controlled MOR. Hysteresis at 0.60 V and peak shifts further highlighted efficient charge transport, enhanced by the brucite layer of Ni-LDH. The electrochemically active surface area was calculated to be 0.042 cm², and linear sweep voltammetry revealed a 5.2 V onset potential. Double potential chronoamperometry confirmed a one-electron redox process, with a Tafel slope of 24.2 mV/dec. Raman analysis supported these findings, showing a redshift of Ni II -O at 474 cm⁻¹ and formate ion vibrations, confirming Ni III -OOH’s role in MOR catalysis on NLGC.

In order to solve the problem of poor performance of pure CoAl-based layered double hydroxide (CAL), a novel hydrothermal-assisted electrodeposition method is used to combine CAL and Ni(OH)2 into a novel integrated 3D structure to enhance its electrochemical performance. The discharge specific capacitance of CAL@Ni(OH)2 composite (CAL-C) prepared by constant current deposition is 2924 F g−1 at the current density of 1 A g−1, which is much higher than the 2072 F g−1 specific capacitance of pure CAL, and is also larger than the 2750 F g−1 specific capacitance of composite (CAL-P) obtained by pulse electrodeposition. In particular, under the high current density of 10 A g−1, the specific capacitance of CAL-C and CAL-P composites is up to 2520 F g−1 and 1760 F g−1, which is 231% and 161% higher than that of pure CAL, respectively. The analysis shows that the CAL-C composite modified by Ni(OH)2 can improve the performance of the supercapacitor mainly by regulating the electronic structure of the material, improving the number of active sites and improving the electrical conductivity.Graphical abstract

Composite electrode materials often have excellent electrochemical properties; however, their preparation often requires multiple steps. Therefore, to further reduce the time and preparation cost, a NiCo 2 S 4 @NiCo-layered double hydroxide (NiCo-LDH) composite electrode material was prepared by a one-step method in this study. In the three-electrode system, the specific capacitance was 7462.5 mF cm −2 at a current density of 5 mA cm −2 . Moreover, the specific capacitance was maintained at 78.4% after 6000 cycles. To further verify its practical application, we assembled an asymmetric supercapacitor using activated carbon as the anode material and NiCo 2 S 4 @NiCo-LDH as the positive material. The results show that the capacity of the device can still be maintained at 80% of its original capacity after 5000 cycles. This shows that the NiCo 2 S 4 @NiCo-LDH@NF electrode material has good application prospects.

The layered double hydroxides (LDHs) have attracted attention in the water treatment field. In this paper, three novel ternary Zn-Co–Ni-LDH adsorbents were prepared successfully through rational construction from 2D to 3D using triethanolamine (TEA) as an alkali source and a structural controlling reagent by hydrothermal technique. Samples were characterized by the SEM, XRD, XPS, FTIR, BET, solid-state UV/vis spectra, and TG. Three Zn-Co–Ni-LDHs exhibited higher crystallinity and surface area which were beneficial to the adsorption for methyl orange (MO). The maximum adsorption capacity of three Zn-Co–Ni-LDH adsorbents can even reach as high as 1871.65 mg·g −1 , 1799.56 mg·g −1 , and 1646.44 mg·g −1 for MO, respectively, which surpass those of most previously reported LDH-based adsorbents. The pseudo-second-order kinetic equation fitted the kinetic data of adsorption, while the equilibrium adsorption isotherm data followed the Langmuir model. The adsorption mechanism, electrochemical, and the antibacterial properties of three Zn-Co–Ni-LDHs were also discussed. This results not only demonstrates that three Zn-Co–Ni-LDHs are practical interest as an efficient adsorbent for the removal of MO from dye waste water, but also provides a strategy for the rational design through three ternary Zn-Co–Ni-LDHs from 2D to 3D.

Investigating efficient and selective photocatalysts for water treatment can help address the energy crisis and numerous environmental issues associated with the use of current fossil fuels. As a shell, we used nickel-layered double hydroxide nanosheets on top of an anatase TiO2-carbon core to create an integrated photocatalyst. Materials were characterized using FTIR, XRD, SEM, HRTEM, and XPS methods for their physical-chemical properties. Using N2 adsorption/desorption at −196 °C, BET-surface area and pore structure were determined. Diffuse reflectance UV–vis was used to determine the photocatalysts band gap. For the TiO2-C/NiLDH amalgam, showed the lowest band gap (3.1 eV) with an exceptional ability to degrade methyl orange as an organic pollutant. Core–shell symmetry in the TiO2-C/NiLDH amalgam provides a larger surface area (72 m2/g) for interfacial interaction and a wider base for efficient charge transfer. In subsequent tests, this photocatalyst showed a remarkable level of stability and water treatment efficacy. That the TiO2-C/NiLDH amalgam can be used to alter solar energy and protect the environment has been demonstrated by these promising results.

Ammonia is important for industrial development and human life. The traditional Haber Bosch method converts nitrogen into ammonia gas at high temperatures and pressures, causing serious pollution and greenhouse gas emissions. These problems prompt the nitrogen fixation method to proceed in a sustainable way. Ultrathin Ni/V-layered double hydroxides (Ni/V-LDHs) nanosheets with different proportions were prepared successfully for photocatalystic reduction of nitrogen to ammonia, through aqueous miscible organic solvent method (AMO) to achieve the higher surface area and rich oxygen vacancies, containing more carriers and active sites to enhance nitrogen reduction. And the optimal catalyst of Ni/V-LDHs 11 AMO possesses the highest photocatalytic efficiency (176 µmol·g −1 ·h −1 ), indicating its potential application prospects in catalyst fields. Consequently, this work achieves an environmentally friendly, low-cost and efficient conversion method for nitrogen reduction to ammonia through solar energy.

Ceftriaxone (CEF) is a β-lactam antibiotic widely used in the medical field to treat various bacterial infections in both humans and animals. The high usage of CEF has the potential to cause environmental pollution and antimicrobial resistance, necessitating effective treatment methods. In this study, the adsorption method is proposed using Ni/Al layered double hydroxide (LDH) and Camellia sinensis extract-modified material (Ni/Al-CSe) as a sustainable bio-modification approach. The results show the optimal adsorption pH for Ni/Al LDH is 3 and for Ni/Al-CSe is 5, with the adsorption isotherms following the Freundlich model and the kinetics conforming to pseudo-first order (PFO). The maximum adsorption capacity (Qm) significantly increased from 28.818 mg.g-1 (Ni/Al LDH) to 111.111 mg.g-1 (Ni/Al-CSe). Thermodynamic analysis revealed that adsorption on both materials proceeds spontaneously, while the consistently more negative ΔG values and predominantly exothermic behavior of Ni/Al-CSe confirm its superior thermodynamic favorability associated with more specific surface interactions. Regeneration tests up to four cycles showed that Ni/Al-CSe was more stable than Ni/Al LDH. Overall, modifying Ni/Al LDH with Camellia sinensis extract was proven to enhance adsorption capacity, spontaneity, and stability, providing an effective and environmentally friendly solution for antibiotic treatment. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).