JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Xiaojuan Zhang,Ting Dong,Linhao Wang,Tianhua Yang,Yanlong Li,Wanli Zhang
With high microporosity, good dispersibility, excellent specific surface area and large content surface functional group, hydrochar demonstrates significant advantages and strong affinity towards pollutants in water. Modification method plays a significant role for anion adsorption by modified hydrochar, layered double hydroxide (LDH) modified hydrocarbons (Mg/Al-LDH@HC-HCl) have been synthesized through a one-step hydrothermal approach and activated with hydrochloric acid in this paper. The physical and chemical characteristics of the hydrochar, both before and after modification, are analyzed using BET, SEM-EDS, TEM, XRD, FTIR, and XPS to explore the phosphate adsorption mechanisms. The adsorption behavior of the composite follows the pseudo-second-order kinetic model and the Langmuir isotherm model, achieving a substantial adsorption capacity of 143.03 mg/g. Multiple mechanisms are leveraged within the absorption process, including pore filling, electrostatic attraction, ligand exchange, metal complexation on inner and outer surfaces, and ion exchange. An approximate 70% phosphate removal efficiency is retained by modified Mg/Al-LDH@HC-HCl after a comprehensive 5-cycle desorption using NaOH as the eluent, demonstrating the remarkable regenerability of synthesized hydrochar composite.
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PubMed
高影响因子
Energy Storage Materials
·
2024
·
IF 18.9
Cao Jiang,Biao Chen,Maowen Xu,Jian Jiang
The single ionic doping helps suppress the detrimental phase transition when P2-type layered cathodes are charged to a high voltage above 4.0 V ( vs. Na + /Na). However, this is realized at the sacrifice of their electrochemical redox centers and output capacities. To achieve both high voltage tolerance and capacity, we herein propose a cooperative Al cation and F anion co-doping strategy. The XANES detections affirm that substituting Ni/O with Al/F intends to augment the amount of highly active Mn 3+ cations in cathodes, making more contributions on specific capacities for sodium-ion batteries (SIBs). Besides, this co-doping treatment would disorder the transition metal ionic arrangements of cathodes, disrupting long-range Jahn-Teller effects and impeding other undesired phases generation. As a proof-of-concept demonstration, our designed Na 2/3 Ni 0.23 Al 0.1 Mn 2/3 O 1.95 F 0.05 (NAF) cathodes show a delivered capacity as high as 142.0 mAh g −1 (0.2C), and an impressive capacity retention of 86.7 % after all cycling. The in-situ XRD detections reveal no apparent O2 phase peaks emerge until 4.23 V upon deep Na + extraction from NAF. This work provides a key understanding toward cation/anion co-doping effects, opening up a useful avenue for rational design of practical P2-type cathodes for SIBs.
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高影响因子
Coatings
·
2022
·Vol. 12
·期 12
·1837
·
IF 3.236
Haotian Cai,Kamale Tuokedaerhan,Zhenchuan Lu,Renjia Zhang,Hongguo Du
In this article, we report the preparation of Al-doped ZrO2(AZO) thin films by the sol–gel method. The electrical properties, microstructure, and optical properties of AZO high-k gate dielectric films at different annealing temperatures were systematically investigated. XRD results confirm that the AZO film was amorphous at a temperature of 600 °C, and Al doping raises the crystallization temperature of ZrO2. AFM and FESEM show a smooth surface of AZO film without cracks. As the annealing temperature increased from 600 to 900 °C, all of the films had similar RMS roughness under 1 nm, the film thickness decreased accordingly, the bandgap value increased from 5.77 to 5.82 eV, the valence band shift (ΔEv) increased, and the conduction band shift (ΔEc) decreased. XPS analysis showed that silicates were formed at the AZO/Si interfacial layer. Electrical performance tests showed that high-temperature annealing can effectively improve the electrical properties, as shown by the increase in dielectric constant (k) and the decrease in flat-band voltage (ΔVfb). However, an increase in leakage current density with increasing annealing temperature was observed due to the decrease inΔEcand the appearance of crystallization caused by the increase in annealing temperature.Keywords:high-k gate dielectrics;sol–gel;Al-doped ZrO2;thin films
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Wenli Zhu,Jing Zhang,Xiaowan Zhang,Lizhen Han,Peige Qin,Shufang Tian,Qian Zhou,Xuebin Zhang,Minghua Lu
The Al-doped mesoporous crystalline material-41 (Al-MCM-41) composite was prepared and applied as fiber coating material of headspace solid-phase microextraction (HS-SPME) for extraction of polycyclic aromatic hydrocarbons (PAHs) from human urine. Five PAHs including acenaphthene, fluorene, phenanthrene, anthracene, and pyrene are chosen as target analytes to evaluate the performance of the material by GC-FID analysis. The mesoporous Al-MCM-41 composite was characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, nitrogen adsorption/desorption measurement, and thermogravimetric analysis. The parameters affecting the extraction efficiency of HS-SPME were investigated. Under the optimal conditions, the method exhibits ideal linearity for target analytes in the range of 0.3–600 ng⋅mL -1 with the coefficients (R 2 ) equal or higher than 0.9906. The enrichment factors are calculated from 540 to 1760. The limits of detection (LODs) and limits of quantitation (LOQs) are between the ranges of 0.06–0.18 and 0.3–0.9 ng⋅mL -1 , respectively. The relative standard deviations (RSDs) ( n = 5) of intra-day and inter-day are in the ranges of 1.08–7.49% and 2.84–18.3% respectively. The fiber-to-fiber reproducibility ( n = 3) is in the range of 6.47–13.9%. The method was successfully applied for the analysis of PAHs in human urine with reasonable recoveries which is ranging from 73.29 to 116.1%.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Fanhui Liao,Weibin Liang,Meixian Li,Donghai Xu,Le Yang
Selective hydrogenation of carboxylic acids to alcohols remains a challenge due to the requirement of synergistic multiple active sites for H2 activation, reactant adsorption, and selective C–O bond scission. Here, we construct a series of Co–Al metal–metal oxide (MMO) catalysts via the hydrogen-induced reduction of layered double hydroxide (LDH) precursors with tunable Co/Al ratios. The optimal Co4Al1-MMO catalyst exhibits highly dispersed Co0 nanoparticles alongside abundant oxygen vacancies (Ov-Co). The Co0/Ov-Co dual sites synergistically promote H2 dissociation and carbonyl oxygen C=O bond activation, while moderate lattice oxygen stabilizes the metastable structure. Under mild conditions (180 °C, 2 MPa of H2, 3 h), the catalyst achieves 100% conversion of octanoic acid with 99% alcohol selectivity, outperforming state-of-the-art noble-metal systems. This work provides a general strategy for engineering cooperative metallic/defective sites in nonprecious MMO catalysts for selective hydrogenation reactions.
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高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Zhenyu Wu,Zengxi Li,Chunshan Li
The bare amorphous Al 2 O 3 -AlPO 4 and Cs/Al 2 O 3 -AlPO 4 catalysts were developed for the aldol condensation of methyl acetate with formaldehyde to methyl acrylate. The structure and property of catalyst were characterized by XRD, XPS, BET, Pyridine-IR, FT-IR, 27 Al-MASNMR, NH 3 -/CO 2 -TPD and SEM. The correlation between structural features and acid-base properties was established, and the loading effect of the cesium species was investigated. Due to cooperative catalytic effects between the penta-coordinated Al and Al 2 O 3 , the weak-II acid and medium acid site densities and the product selectivity were improved. While the basic site densities of these catalysts were almost in proportion to the conversion of methyl acetate. The loaded Cs could form new basic sites and change the distribution of acid sites which further enhance the catalytic performance. As a result, the 10Cs/8AlP was proved to be an optimal catalyst with the yield and selectivity of 21.2% and 85% for methyl acrylate respectively. During the reaction, a deactivation behavior was observed on 10Cs/8AlP catalyst due to the carbon deposition, however, it could be regenerated by thermal treatment in the air atmosphere at 400 °C.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Jicheng Rui,Ning Deng,Yiying Zhao,Chen Tao,Jizhi Zhou,Zhenzhen Zhao,Xin Huang
Considerable interest has been focusing on the activation of peroxydisulfate (PDS) by layered double hydroxide (LDH) for degradation of organic pollutants . However, understanding the structure and chemistry of LDH by which the activation of PDS could achieve a high degradation efficiency of organic compounds is an unsolved and fundamental question in advanced oxidation processes (AOPs), and one which, if harnessed, could enable the rational design of LDH with desired material properties. In this work, Mg/Al-LDH was synthesized with variable structures and compositions through doping different proportions of Mn 2+ . We advanced to understand this question of how LDH by these characteristics can affect the activation of PDS for degradation of organic pollutants. At a relatively low dosage of Mn (˂ 1%) in Mg/Al-LDH, the degradation rate of phenol by LDH activated PDS increased with the increase content of Mn, which was achieved by an increase of catalytic sites in Mg/Al-LDH interlayer. Rather, higher content of Mn (˃ 1%) significantly lowered the degradation performance of phenol as the decrease of interlayer space resulted in reduction of PDS intercalation in LDH and the formation of secondary Mn-related minerals (i.e., Mn 3 O 4 ) led to meaningless consumption of PDS. Finally, the degradation of phenol by LDH activated PDS followed a non-radical ( 1 O 2 ) mechanism. Our ability to quantify how the chemical and structural variability of LDH influence the activation of PDS for organic degradation could mark an important step toward synthesis strategies for advanced catalysts.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Haihua Xu,Sidi Zhu,Mingzhu Xia,Fengyun Wang,Xuehai Ju
In this work, a novel adsorbent, 3D hierarchical CS@PANI@ZnAl-LDH composite, has been successfully fabricated through the hydrothermal synthesis of the carbon sphere, oxidative polymerization of polyaniline, and in-site growth of ZnAl-layered double hydroxides, simultaneously applied for the naproxen removal from aqueous solutions. The dynamics and isotherms fit better with the pseudo-second-order and Langmuir model, demonstrating the chemisorption , monolayer, and endothermic process. In addition, the high uptake capacities of CS@PANI@ZnAl-LDH for naproxen was 545.5 mg/g at 298 K when the pH was 5.0, outperforming most previously reported materials. Moreover, after five adsorption-desorption cycles, the spent CS@PANI@ZnAl-LDH maintains high removal efficiency and structural composition, revealing excellent recyclability and stability. Furthermore, Fourier transformed infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS) analyses indicate electrostatic interactions, π-π interactions, and hydrogen bonding between CS@APNI@ZnAl-LDH and naproxen. Quantitative analyses, Localized orbit locator (LOL)-π isosurface, and Independent Gradient Model further verify the adsorption mechanisms mentioned above, indicating the synergistic effects between PANI and ZnAl-LDH improve the elimination ability for naproxen. Significantly, Hirshfeld surface analyses reveal that naproxen behaves as the H-bond acceptor, and the ZnAl-LDH acts as the H-bond donor. This work provided a feasible way to design purification materials for wastewater treatment .
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高影响因子
ADVANCED ENGINEERING MATERIALS
·
2025
·Vol. 28
·期 2
·e202501970
·
IF 3.3
Zhishuai Liu,Siran Wang,Yujia Liu,Junwei Sha,Rui Li,Xudong Yang
Achieving the stability of pore structure and the enhancement of mechanical properties is the prominent target for aluminum (Al) foam design. In this work, the effects of manganese (Mn) content on the pore structure, mechanical properties, and deformation behavior of Al Mn foams are investigated. The results show that the appropriate addition of Mn (1.5 wt%) achieves a remarkable balance between energy absorption capacity (4.37 MJ m −3 ) and pore uniformity (standard deviation of 0.95 mm in average pore size), representing substantial enhancements of 193.28% in yield strength and 385.56% in energy absorption capacity compared to pure Al foams. These enhancements are attributed to a refined pore architecture, finely dispersed Al 6 Mn precipitates, and a sequential collapse mechanism, which collectively enable progressive energy dissipation. The application of the entropy weight method is pioneered in this study to establish a predictive framework for multiobjective design, demonstrating that energy absorption and pore uniformity are crucial factors for the matrix design of Al foams. These findings offer a potential strategy for future engineering applications of metal foam design.
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高影响因子
CHEMICAL GEOLOGY
·
2026
·
IF 3.6
Yuan Qiu,Lisong Ma,Biao Wan,Xinran Liang,Shuai Lan,Guanjie Jiang,Yang Li,Qin Zhang,Yupeng Yan
Poorly crystalline iron hydroxides, such as ferrihydrite (Fh) and its aluminum-substituted counterpart (Al-substituted ferrihydrite, Al-Fh), are ubiquitous in surficial geochemical environments and undergo strong interfacial interactions with organic phosphorus (e.g., myo -inositol hexakisphosphate, phytate, IHP). However, how these interactions regulate the Fe(II)-catalyzed dissolution–recrystallization of Fh and Al-Fh into secondary Fe minerals and consequently influence phosphorus geochemical mobility and sequestration remains unclear. This study systematically investigated the Fe(II)-catalyzed transformation of phytate-preadsorbed Al-Fh via batch experiments and multiple characterizations to elucidate the regulatory role of phytate in governing Fe(II)-catalyzed Al-Fh transformation and phytate repartitioning. Results showed that isomorphous Al substitution inhibited goethite (Gt) nucleation in Fe(II)-catalyzed Al-Fh transformation by decreasing Al-Fh crystallinity and disrupting the periodic Fe–O–Fe crystal lattice arrangement. Fe(II) drove mineral dissolution and secondary phase nucleation via interfacial electron transfer (IET), with catalytic efficiency positively correlated with its concentration. Phytate exerted a concentration-dependent effect: at low concentration (0.5 mM), it impeded the further transformation of lepidocrocite (Lp) to Gt through strong inner-sphere surface complexation of phytate on reactive Fe sites, thereby favoring Lp mineral accumulation. At higher concentrations (≥1.0 mM), it greatly inhibited Al-Fh transformation via a combination of surface complexation, IET inhibition, reactive Fe(II) depletion, and the occupation of mineral dissolution sites, resulting in metastable Lp or amorphous products. Mechanistically, phytate formed stable complexes on Al-Fh surfaces, hindering electron transfer. Concurrently, phytate and Fe(II) generated ternary complexes (≡Fe–IHP–Fe(II)) or surface iron phytate precipitates on minerals, thereby depleting the reactive Fe(II) pool. Throughout transformation, phytate remained strongly sequestered in the solid phase rather than being released into solution due to its strong geochemical interactions with Fe/Al hydroxides. This work elucidates the synergistic regulatory mechanisms of Al and phytate in Al-Fh transformation, offering key theoretical insights into organic phosphorus–iron hydroxide interactions and long-term phosphorus immobilization in Al-rich soils.
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高影响因子
Energetic Materials Frontiers
·
2026
·
IF 4.7
Kai Miao,Zi-chen Wang,Lu Wang,Yang Ran,Heng Xue,Shuang Gao,Sheng Huang,Di-chen Li
UV-curing-assisted direct ink writing (DIW) is an established additive manufacturing technique for composite solid propellants, facilitating the development aerospace propulsion systems. However, direct application to aluminum (Al)-containing propellant slurries leads to limited curing depth, attributed to the high UV absorbance of aluminum powder. To address this limitation, we propose a novel surface modification strategy in which aluminum powders are coated with polytetrafluoroethylene (PTFE), yielding PTFE@Al composite powders with a core-shell structure. UV absorbance measurements show that PTFE coatings reduce the absorbance of aluminum powder by approximately 63%. Scanning electron microscopy (SEM) confirmed the uniformity and integrity of the PTFE coatings. Thermogravimetric (TG) and differential scanning calorimetry (DSC) analyses indicate that PTFE coating significantly enhances the energy release of aluminum powder, achieving an exothermic heat output of 2.19 kJ·g -1 below 1400 °C-approximately three times that of uncoated aluminum. Furthermore, curing tests on formulations containing PTFE@Al powders demonstrated an approximate 15% increase in curing depth. These results demonstrate that PTFE@Al composite powders not only overcome the limitations of aluminum’s UV absorption but also significantly enhance photocuring efficiency and energetic output. This work presents an innovative material design strategy and a practical route for additive manufacturing of high-performance solid propellant grains.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Haoran Li,Ning Wang,Yilian Song,Kang Dong,Youjun Xing,Minghui Zhang,Yukui Wang,Wei Liu,Yongcheng Jin
Recently, research on high-voltage challenges of Ni-rich layered oxide (LiNi x Co y Mn z O 2 , x + y + z = 1, where x ≥ 0.6) cathodes has become a focal point for achieving high-energy-density lithium-ion batteries due to their severe structural and electrochemical degradation under high-voltage operation. This study presents a dual-doping strategy by incorporating tungsten (W 6+ ) and aluminum (Al 3+ ) to enhance the stability and performance of LiNi 0.65 Co 0.15 Mn 0.20 O 2 (NCM) cathodes. Multiscale characterization, combining in situ XRD, electron microscopy (SEM/FIB-SEM/TEM), and surface analysis (XPS/EPR), revealed that W Al co-doping effectively suppresses cation disorder, stabilizes lattice oxygen, and inhibits microcrack propagation. Moreover, density functional theory calculations further elucidate the stabilization mechanisms, indicating that W 6+ and Al 3+ synergistically reduce the bandgap, enhance electronic conductivity, and strengthen metal-oxygen bonds. As a result, the optimized W/Al co-doping cathode (1.5W-0.5Al) delivers outstanding electrochemical performance, exhibiting a high capacity of 205.95 mAh g −1 at 0.1C and remarkable rate capability (148.2 mAh g −1 at 15C). The material demonstrates exceptional cycling stability, maintaining 122.17 mAh g −1 after 500 cycles at 1C (2.5–4.5 V), while achieving over 1000 stable cycles at 15C. This work establishes an effective dual-doping approach for developing high-voltage Ni-rich cathodes, providing both fundamental insights and practical solutions for next-generation energy storage systems.
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高影响因子
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