ENERGY & FUELS
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2024
·
IF 5.2
Yuan-Ming Cao,Xue-Lei Duan,Miao Bian,Hou-Yu Wang,Yi-Wen Shen,Chong Gao,Chun-Gang Yuan
The immobilization of Hg0 and detoxication of Hg-containing composites are enormous challenges for Hg pollution control, which provide a high requirement for the design and synthesis of materials. Herein, a new composite with halloysite, selenium, and transition metals as raw materials (FeCo-LDH/HNTs@Se) for a Hg0 trap was designed by precipitation with ion exchange and an in situ selenization method. Intrinsic features such as high affinity, microwave permittivity (109–1012), large surface area, abundant pores, and many active components favored Hg0 removal and immobilization. The removal performance, flue gas tolerance, and synergistic effect of active components were improved greatly when microwave was added. The study indicated that (1) the Hg0 removal efficiency of the composite could reach 99.4%; (2) the composite had excellent tolerance to different industries’ flue gases. The electron exchange of Co(II)/Co(III) and Fe(II)/Fe(III) and the existence of Se and SeO2 were important for Hg0 immobilization. HgSe was the main adsorption product based on both X-ray photoelectron spectroscopy (XPS) and an online lab-built thermal decomposition system (TPD-AFS) analysis, which made the used-materials possess low mercury leaching content (0.09 mg·L–1) lower than the US EPA regulatory value (0.2 mg·L–1). This work provides a sound way for mercury control, which is significant for environmental protection.
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Analytical Methods
·
2024
·
IF 2.7
Honglin Qin,Ruozhu Xu,Lizhen Qiao,Xupeng Zhai,Peixin Guo,Chen Li,Bingyan Han
The widespread use of endocrine disruptors (EDPs) has certain potential hazards to organisms and environments, and it is particularly important to develop effective pretreatment methods before detection of EDPs in complex samples. In this work, a novel magnetic nanocomposite decorated with layered double hydroxides (LDHs) and carbon dots (CDs) was designed and prepared for magnetic solid-phase extraction (MSPE) of EDPs (bisphenol S, bisphenol F, bisphenol A, bisphenol AF, diethylstilbestrol and 4-cumylphenol) combined with high-performance liquid chromatography-ultraviolet (HPLC-UV) detection. The prepared composites were characterized by field emission scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS), and the adsorption mechanism towards these EDPs might be mainly based on hydrogen bonds and π–π conjugation. Under the optimized conditions, the proposed method showed limits of detection within 0.05–0.50 μg L−1 and limits of quantitation within 0.2–2.0 μg L−1, and good linearity (R2 ≥ 0.9975) was presented in the range of 0.2–200 μg L−1. Finally, the Fe3O4@C@NiCo-LDH@CDs composite-based MSPE-HPLC-UV method was applied for enrichment and determination of EDPs in water, milk, and tea beverage samples with recoveries in the range of 81.2–119.8% and relative standard deviations below 9.7%.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yi Ma,Luming Li,Yong Zhang,Ning Jian,Huiyan Pan,Jie Deng,Junshan Li
Electrochemical upgrading methanol into value-added formate at the anode in alkaline media enables the boosting production of hydrogen fuel at the cathode with saved energy. To achieve such a cost-effective and efficient electrocatalytic process, herein this work presents a Mn-doped nickel iron layered double hydroxides supported on nickel foam, derived from a simple hydrothermal synthesis. This developed electrocatalyst could act as an efficient bifunctional electrocatalyst for methanol-to-formate with a high faradaic efficiency of nearly 100 %, and for hydrogen evolution reaction, at an external potential of 1.5 V versus reversible hydrogen electrode. Additionally, a current density of 131.1 mA cm −2 with a decay of merely 12.2 % over 120 h continuous long-term testing was generated in co-electrocatalysis of water/methanol solution. Further density functional theoretical calculations were used to unravel the methanol-to-formate reaction mechanism arising from the doping of Fe and/or Mn. This work offers a good example of co-electrocatalysis to produce formate and green hydrogen fuel using a bifunctional electrocatalyst.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Mingtan Wang,Guoqing Xiao,Fei Wang,Chunlin Chen,Junjie Cao,Xiyi Ma,Zhengwei Yang,Rui Zou
Layered double hydroxide (LDH) possesses the effect of interlayer barrier and dilute the concentration of flammable gases due to its unique lamellar structure, which enables it to perform excellent flame retardancy in both gas and condensed phases. In this paper, the abundant hydroxyl and carboxyl groups on the surface of sodium alginate (SA) were utilized to confer excellent hydrophilicity to LDH. Meanwhile, through ion substitution at the carboxyl site of sodium alginate, thus introducing Cu to catalysis charring into LDH@SA for the synthesis of a novel organometallic ion flame retardant (LSCu). Combination of flame retardants with intumescent fireproofing coatings to prepare composite coatings and test them for fire performance. The large panel test indicated that when the LSCu content was 4 %, the backside temperature of the steel panel dropped to 174.7°C, and the char layer surface remained intact, without any holes or cracks. In the furnace test, the composite coating had the highest expansion height (15.6 mm) and expansion rate (13.28 %) with uniform expansion. SEM illustrated that the char layer of the composite coating had a honeycomb structure, which enhanced the adsorption of heat and smoke. In addition, the composite coating retained the highest residual char content (28.1 %), which had to do with the synergistic effect between LDH and Cu complexes. Furthermore, through analyzing the residual char, it was demonstrated that the formation of metal oxides by LSCu at elevated temperatures improved the sustained barrier performance of the char layer.
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Nanoscale
·
2025
·
IF 5.1
Xi-Song Gong,Xing Liu,Jian Zhou
The development of environmentally friendly, high-efficiency, stable, earth-abundant and non-precious metal-based electrocatalysts with fast kinetics and low overpotential for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is of exceeding significance but still challenging. Herein, a bifunctional electrode of unique hierarchical NiFe-LDH/Ni/NiCo2S4/NF (NiFe-LDH = nickel–iron layered double hydroxide and NF = nickel foam) electrocatalytic architecture, which is built up from NiFe-LDH nanosheets, Ni nanoparticles and NiCo2S4 nanoneedles sequentially arrayed on a porous NF substrate, has been prepared by a facile hydrothermal and electrodeposition method. This electrocatalytic architecture is binder-free and its outer NiFe-LDH nanosheets can effectively prevent the oxidation of inner Ni nanoparticles and corrosion of NiCo2S4 nanoneedles during water electrolysis. The integration of effective HER Ni nanoparticles into OER NiFe-LDH and NiCo2S4 electrocatalysts can not only overcome the disadvantage of their poor electrical conductivity, but also greatly improve their HER and OER activities, owing to the unique hierarchical heterostructure and multicomponent synergies among Ni, NiFe-LDH, and NiCo2S4. Consequently, this electrode shows better OER performance with ultra-low overpotential of 192 mV at 10 mA cm−2, a small Tafel slope of only 37 mV dec−1 and high stability in comparison with commercial RuO2, and also exhibits excellent HER activity with a low overpotential of 83 mV at 10 mA cm−2. More importantly, the NiFe-LDH/Ni/NiCo2S4/NF composite serves as anode and cathode for overall water splitting, and it requires a low cell potential of only 1.53 V to reach a current density of 10 mA cm−2, which evidently exceeds that of the standard Pt–C/NF//RuO2/NF cell of 1.61 V. This work provides a feasible strategy to prepare high-efficiency, low-cost and non-precious metal-based electrocatalysts for overall water splitting.
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Molecular Catalysis
·
2024
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IF 3.9
Zi-yu Zheng,Xue-wei Wang,Yi-fan Zhang,Jia Li,Xiao Li,Wen-hua Zhang,Xuan Li
Constructing heterojunction is a good method to improve electrocatalytic activity because the heterojunctions can modulate the Fermi level and redistribute charges of the catalysts to accelerate electron transfer . In this study, Ni 3 S 2 nanocones were prepared on nickel foam (NF) by hydrothermal synthesis, and FeCoNi LDH/Ni 3 S 2 Schottky heterojunctions were constructed by electrodeposition of FeCoNi LDH nanosheets onto Ni 3 S 2 nanocones. Electrochemical results demonstrate that FeCoNi LDH/Ni 3 S 2 /NF is an efficient alkaline OER catalyst, the overpotential is 216 mV at 100 mA cm -2 , and it can maintain stable operation for 110 h. The battery voltage of the dual-electrode structure composed of FeCoNi LDH/Ni 3 S 2 /NF and NF at 1 M KOH is 1.61 V at 10 mA cm -2 . The results of XPS show that the FeCoNi LDH/Ni 3 S 2 Schottky heterojunction optimizes the electronic structure of the interface, accelerating electron transfer. Additionally, the enhanced electric field effect at the tip of Ni 3 S 2 further promotes electron transfer in the heterojunction structure. FeCoNi LDH/Ni 3 S 2 Schottky heterojunction exhibits significant OER activity, which provides a method for synthesizing transition metal heterojunction catalysts with low cost and high activity in the future.
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IONICS
·
2024
·Vol. 30
·期 5
·3033-3044
·
IF 2.4
Lan Yongzhi,Yu Rui,Wang Qing,Dai Jianfeng
A trimetallic layered double hydroxide (LDH), NiCoMg-LDH, was rationally designed and synthesized in this paper by hydrolytic etching of Ni 2+ and Mg 2+ using Co-MOF as a conversion template, during which the rhombic dodecahedral structure of Co-MOF was etched to form a hollow cage structure overlaid with nanosheets on the surface. In comparison to the NiCo-LDH prepared by monometallic ion etching, the NiCoMg-LDH prepared in this study has a larger specific surface area and a more stable hollow porous structure, which can provide a large number of active sites for redox reactions as well as ion transport channels. The trimetallic Ni 1 Co 1 Mg-LDH has a higher specific capacity of 2141.62 F g −1 (208.21 mAh g −1 ) at 1 A g −1 current density compared to the NiCo-LDH. It also keeps 83.61% of its specific capacity after 5000 cycles at 10 A g −1 . It also performs well in rate capacity, with a capacity retention rate of 74.49% at 20 A g −1 . With Ni 1 Co 1 Mg-LDH serving as the positive electrode and AC serving as the negative electrode, the hybrid supercapacitor (HSC) exhibits a high energy density of 61.65 Wh kg −1 at a power density of 800.02 W kg −1 . After 10,000 cycles of charge and discharge, 80.17% of the capacity was retained. This study demonstrates that the trimetallic LDH structure generated using bimetallic ion etching with MOF as a template can increase the performance and stability of supercapacitors.
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Small
·
2025
·
IF 12.1
Lu Luo,Qianqian Zhang,Diwei Shi,Mizi Fan,Guanben Du,Xuesong Tian,Weigang Zhao
Nickel-cobalt layered double hydroxides (NiCo-LDHs) are considered highly promising electrode materials for supercapacitors (SCs). Nevertheless, their limited conductivity and inherent stacking defects lead to inactive electronic states, thereby constraining their electrochemical performance. Here, a dual-conductive-engineered flexible electrode is fabricated through synergistic integration of in situ constructed 3D porous LDH with Ti 3 C 2 T x nanosheets deposition, establishing a semi-confined reaction microenvironment. The collaborative conductive architecture and confinement-enhanced effects enable continuous modulation of Faradaic reaction kinetics during charge/discharge processes, achieving breakthrough improvements in both energy density and cycling stability. The optimized Ti 3 C 2 T x /LDH/CC-50 electrode delivers a remarkable specific capacitance of 1598.7 F g⁻¹ at 1 A g⁻¹, along with excellent rate performance of 87.2% (10 A g −1 ). Furthermore, the constructed aqueous asymmetric supercapacitor (ASC) delivers an impressive energy density of 72.4 Wh kg − ¹ and remarkable cycling stability (90.5% retention after 10 000 cycles). A flexible solid-state asymmetric SC (FSASC) is also fabricated, showcasing a significant energy density of 83.9 Wh kg − ¹ at 900 W kg − ¹ with excellent mechanical flexibility. DFT simulations further revealed enhanced electron transport and a greater number of active sites due to the reduced energy barrier. This work contributes new insights into the structural design of LDH/MXene nanohybrid electrodes for advanced energy density supercapacitors.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Hongyang Mao,Shulei Li,Lihui Gao,Si Shen,Yanhong Liu,Keyi Xu
Coal gasification fine slag (CGFS), a typical coal-based solid waste, poses significant environmental challenges with an annual output exceeding 50 million tons in China. The complex distribution of carbon and ash components necessitates the development of a material that can effectively harness both carbon and ash for comprehensive utilization. While layered double hydroxides (LDHs) exhibit catalytic potential, their performance is often limited by severe particle aggregation. Herein, we engineered a robust carbon-anchored Fe-Al-LDH composite (CGFS-LDH) through hydrothermal co-precipitation, demonstrating exceptional efficacy in H 2 O 2 activation for phenol degradation. Remarkably, CGFS-LDH achieved 100 % removal of 200 mg L −1 phenol within 60 min. Advanced characterization (XPS, XRD, EPR, LC-MS, and electrochemical analysis) revealed that CGFS serves dual roles: as a structural scaffold preventing LDH aggregation and as an electron shuttle promoting Fe 2+ /Fe 3+ redox cycling. Although trace amounts of Fe (0.2 wt%) and Al (0.3 wt%) leached due to dynamic precipitation-dissolution equilibrium, the catalyst maintained outstanding stability over multiple cycles, with negligible activity loss. This work introduces an effective strategy for the comprehensive utilization and high-value transformation of CGFS, while also providing novel insights into the development of highly efficient and stable porous nanocomposites catalysts.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Tao Li,Jiahui Zou,Lingyuan Hong,Jian Zhang,Weikun Sun,Zumin Qiu,Mohammad Younas
Levofloxacin (LFX), a widely used antibiotic, exhibits high chemical stability and resistance to conventional wastewater treatment methods, posing serious environmental and health concerns. In this study, a super-capacitor activated carbon (SAC) doped with flower-like CoAl-layered double hydroxide (LDH) was synthesized via a one-step hydrothermal method through a doping strategy. The SAC-LDH composite demonstrated superior performance in activating peroxymonosulfate (PMS, 0.12 mM) achieving 95 % degradation efficiency of LFX (10 mg/L) within 5 min. The high specific surface area and excellent adsorption capacity of SAC facilitated effective accumulation of LFX on the catalyst surface, enhancing reaction kinetics. The rapid conversion of Co 2 + and Co 3+ in the catalyst was suggested to generate highly reactive oxygen species, including SO 4 •- , •OH, O 2 •- , and 1 O 2 . This process was further demonstrated by electron paramagnetic resonance (EPR), in-situ Raman spectroscopy, Fourier transform infrared spectroscopy (FT-IR), and X-ray photo-electron spectroscopy (XPS). Pilot-scale fixed-bed reactor testing of SAC-LDH for pre-treated hospital wastewater treatment (soluble chemical oxygen demand (SCOD) > 140 mg/L) was conducted. The system exhibited long-term stability, anti-interference ability, and high catalytic efficiency under continuous flow condition (1.0 L/h, 7 days). These findings highlight the developed composite SAC-LDH + PMS system as a highly efficient, stable, and scalable solution for treating antibiotic-contaminated wastewater treatment, offering strong potential for real-world environmental remediation application.
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PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Xiaoya Ding,Yabei Zhang,Xu Zhang,Guangyu Zhu,Qianyun Tan,Zhiyong Mao,Fuyan Kang,Fa-Qian Liu
To overcome the limitations of traditional corrosion-resistant coatings, which rely solely on passive protection and exhibit poor durability, this study innovatively prepared a multifunctional hybrid filler, halloysite@layered double hydroxide loaded with 8-hydroxyquinoline and functionalized with 3-aminopropyltriethoxysilane (Hal@LDH-8HQ@APTES, HLQA). Specifically, calcined halloysite (Hal) was used as a template to in situ grow layered double hydroxide (LDH) loaded with 8-hydroxyquinoline (8-HQ) corrosion inhibitor, forming the Hal@LDH-8HQ (HLQ) hybrid. Subsequently, 3-aminopropyl triethoxysilane (APTES) was used for surface modification to enhance its interface compatibility with the polymer matrix. The resulting composite coating achieves a dual synergistic protective mechanism: (1) passive protection through physical shielding and prolonging the diffusion path of corrosive media; (2) active protection and self-healing functionality based on the anion exchange properties of LDH, simultaneously achieving chloride ion capture and controlled release of the 8-HQ corrosion inhibitor. Electrochemical impedance spectroscopy (EIS) test results indicate that the HLQA/EP composite coating exhibits outstanding long-term corrosion resistance. After immersion in a 3.5 wt% NaCl solution for 45 days, its low-frequency impedance modulus (|Z| 0.01 Hz ) remains as high as 10 9 Ω·cm 2 . Most importantly, for artificially damaged coatings, after only 12 h of immersion in a 3.5 wt% NaCl solution, the low-frequency impedance values in the damaged areas showed a significant upward trend, strongly validating the self-healing capability of the coating. This study not only significantly enhances the comprehensive protective performance of the coating but also achieves significant progress in realizing an integrated synergistic mechanism of “passive-active-self-healing” for the coating.
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DESALINATION
·
2025
·
IF 9.8
Sehria Zia,Muhammad Kashif,Haojie Ge,Kaiyu Zhao,Yafei Guo,Tianlong Deng
This study investigates the synthesis, characterization and adsorption efficiency of PDMS@Li/ZnAl-LDH as a potential adsorbent for lithium recovery from Salt Lake brine with a high Mg/Li ratio. Synthesized via co-precipitation, the adsorbent exhibited excellent stability across a wide range of pH and temperature, along with a well-defined layered crystalline structure. The maximum adsorption capacity of Li + is 14.1 mg/g in lithium brine and 9.4 mg/g in the Qarhan Salt Lake's brine with impressive selectivity, as indicated by separation factors of 215, 838 and 175 for Li + /K + , Li + /Na + and Li + /Mg 2+ , respectively. Microspheres formed by Li/ZnAl-LDH in ultra-pure water exhibited tunable pore size and porosity as compared to Li/Al-LDH, which enhanced the Li + adsorption. Cyclic adsorption and zinc dissolution tests confirmed the adsorbent's excellent reusability with no significant structural degradation. Furthermore, using NaAlO 2 as a precursor reduces cost, making Li/ZnAl-LDH a viable option for large-scale lithium recovery. This work presents a sustainable, cost-effective strategy for lithium recovery with potential industrial applications.
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