Agronomy-Basel
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2025
·Vol. 15
·期 7
·1601
·
IF 3.4
Hui Chen,Siyao Li,Chengheng Fan,Jiling Cao
Biological nitrogen (N) fixation is an ecological method used to provide nutrition for crops and reduce fertilizer application in terrestrial ecosystems. Silver nanoparticles (AgNPs) are becoming environmental contaminants, and, thus, could negatively affect the activity and diversity of soil diazotrophs. To test this, a greenhouse pot experiment for growing maize was performed under different concentrations of AgNPs (0, 1, 5, 10, 20 mg kg−1). We measured the N2-fixation activity and abundance ofnifHgene encoding the nitrogenase reductase subunit and analyzed the diversity, composition and co-occurrence networks of diazotrophic communities in maize rhizospheric soil. Results showed that a lower dose of AgNPs did not show significant influence on soil diazotrophs, while a higher dose of AgNPs decreased both soil N2-fixation activity andnifHgene abundance, though diazotrophic diversity remained unchanged. AgNPs at 10 mg kg−1and 20 mg kg−1strongly shifted the community composition of diazotrophs, increasing the proportions ofBradyrhizobiumandPaenibacillus,while decreasingAzospirillumandRhizobium.Network analysis revealed weakened negative associations among species under AgNPs, with keystone taxa shifting fromBradyrhizobium,Geobacter,AzospirillumandBurkholderiatoBradyrhizobium,PaenibacillusandSkermanellaunder AgNPs. Soil-soluble Ag, dissolved organic carbon and soil pH were identified as the factors most closely driving the diazotrophic community composition. In conclusion, higher doses of AgNPs could inhibit N2-fixation activity and shape the diazotrophic communities. These findings provide empirical evidence of AgNPs’ ecological impacts on soil microbial functions.
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FIRE SAFETY JOURNAL
·
2025
·
IF 3.3
Ning Kang,Zhiqiang Zhao,Xiaoyang Yu,Qian Li,Jin Lin,Shouxiang Lu
The CO elimination from fire smoke containing fire suppressants through transition metal oxides supported by ceria catalysts (M/Ce) faces new challenges. The effects of two typical fire suppressants (CF 3 Br and NaHCO 3 ) on the conversion of CO and the evolution of intermediate species on three M/Ce catalysts (M = Cu, Co and Mn) were investigated. The impact mechanism of the fire suppressants was further revealed via in situ DRIFTS experiments for Cu/Ce catalyst in the absence and presence of fire suppressants. The results show that the activity and reusability of Cu/Ce and Co/Ce are decreased by the CF 3 Br pretreatment but Mn/Ce exhibits a certain resistance. For the effect of NaHCO 3 , the pyrolysis gases play a dominant role and its degree depends on the reaction temperature and the CO adsorption and activation capacity of catalysts. Moreover, in situ DRIFTS results reveal that the blocked reaction of adsorbed CO intermediates and oxygen species and the more severe masking of carbonates on the catalyst surface could be responsible for the decrease of the CO elimination performance due to the typical fire suppressants. This work can provide valuable insights for understanding the inhibition mechanism of fire suppression on CO elimination and exploring the resistance strategies to guarantee emergency rescue.
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ACS Catalysis
·
2025
·
IF 13.1
Ruyang Wang,Jing Yang,Peiyu Ma,Heng Cao,Zhentao Ma,Yide Zhu,Hao Lou,Zhandong Wang,Lei Luo,Jun Bao
Optimizing the CO hydrogenation to higher oxygenates (C2+-Oxy) is both an intriguing opportunity and significant challenges. The strong metal–support interaction (SMSI) provides a promising avenue to regulate catalytic performance of CO hydrogenation, as it facilitates the encapsulation of nanoparticles and the modulation of active sites. In this study, we proved that Rh/MnO2 exhibited SMSI subsequent to H2 reduction. The coverage of MnOx suboxides on the surface of Rh particles was regulated by the reduction temperature, which in turn affected the quantity of consecutive Rh sites and the Rh+/Rh0 ratio. This modulation contributed to an improvement in both the catalytic activity and selectivity for C2+-Oxy. Based on synchrotron-based vacuum ultraviolet photoionization mass spectrometry results, the presence of ketene (CH2CO) indicated that the initial carbon–carbon coupling might occur between the adsorbed *CH2 and *CO. Subsequently, two different C2 oxygenated intermediates were constructed, and the dominant one was also regulated by the MnOx coating, thereby adjusting the ratio of aldehyde and alcohol products. This study expands upon the catalyst system of SMSI and offers a significant contribution to understanding of the reaction mechanism involved in the C2+-Oxy synthesis.
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Nuclear Science and Techniques
·
2025
·Vol. 36
·期 9
·1-16
·
IF 3.8
Leng Yang-Chun,Feng Jin-Cai,Jiang Qiao,Li Ze-Hua,Feng Hao-Xin
Colloids are prevalent in nuclear waste repositories, with bentonite colloids posing an uncontrollable risk factor for nuclide migration processes. In this study, static adsorption experiments were coupled with dynamic shower experiments to comprehensively investigate the influence of bentonite colloids on \({\hbox {Sr}^{2+}}\) migration in granite, considering adsorption capacity. Bentonite colloids have a considerably greater adsorption capacity than both bentonite and granite, with a maximum adsorption of 30.303 mg/g. The adsorption behavior of bentonite colloids on \({\hbox {Sr}^{2+}}\) is well described by the Langmuir isotherm and pseudo-second-order kinetic models, indicating that a single-layer chemical adsorption process is controlled by the site activation energy. The adsorbed \({\hbox {Sr}^{2+}}\) is unevenly distributed on the colloids, and the adsorption mechanism may involve ion exchange with Ca. Bentonite colloids exhibit superior adsorption in neutral environments. The cations in groundwater inhibit \({\hbox {Sr}^{2+}}\) adsorption, and the inhibition efficacy decreases in the order \({\hbox {Fe}^{3+}}>{\hbox {Ca}^{2+}}>{\hbox {Mg}^{2+}}>{\hbox {K}^+}\) . The presence of bentonite colloids in a granite column slightly influences the retention of \({\hbox {Sr}^{2+}}\) in the column while markedly reducing the \({\hbox {Sr}^{2+}}\) penetration time from 70 h to 18 h. However, the coexistence of \({\hbox {Co}^{2+}}\) , \({\hbox {Ni}^{2+}}\) , and \({\hbox {Cs}^{+}}\) in a multinuclide system weakens the ability of the colloids to promote \({\hbox {Sr}^{2+}}\) migration. In comigration of colloid and multinuclide systems, the adsorption of nuclides by bentonite colloids causes the nuclide migration speed to decrease in the order \({\hbox {Sr}^{2+}}\) > \({\hbox {Cs}^{+}}\) > \({\hbox {Ni}^{2+}}\) > \({\hbox {Co}^{2+}}\) . This study provides insights into \({\hbox {Sr}^{2+}}\) migration in cave repositories for low- and medium-level radioactive waste.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2025
·
IF 4.9
Wenhua Wang,Xin Lu,Zhipeng Xu,Long Chen,Wei Lu,Jiacheng Wang,Min Xu
Migraine is one of the most common and debilitating neurological disorders worldwide, and neurogenic inflammation is thought to be a key factor. More recently, natural carrier-free co-assemblies of small molecules have been shown to be an effective new type of therapeutic system. This study developed nanoparticles co-assembled with oleanolic acid (OA) and evodiamine (Evo), based on active ingredients from traditional Chinese medicine, with a particle size of approximately 380 nm and a surface charge of approximately −14.6 mV. The analysis of the assembly mechanism shows that the co-assembly of OA and Evo (OA-Evo CNPs) is mainly mediated by hydrogen bonding interactions, π-π stacking and hydrophobic interactions. The physicochemical characterisation demonstrated that the OA-Evo CNPs exhibited favourable hydrophilic properties, slow-release characteristics, and in vitro safety. The co-assembly of nanoparticles has been demonstrated to exert a substantial improvements effect on nitroglycerin-induced migraine-like behaviour in mouse models, as evidenced by the observation of significant improvements in biochemical (NO, 5-HT, and CGRP, etc) and inflammatory markers (TNF-α、IL-1β and IL-6) in the plasma, along with a notable reduction in microglia activation within the brain tissue of test subjects. This study proposes a strategy for co-assembly of natural small molecules and highlights the synergistic effect of the combined plant compounds.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Longlong Jiang,Yanjun Li,Donghua Liu,Yue You,Jin Chen,Donghai Ding,Guoqing Xiao
Aiming to prepare high performance zirconia fibers efficiently, a novel yttria-alumina co-doped zirconia (YADZ) fiber with improved flexibility, outstanding thermal stability and insulation performance was fabricated by centrifugal spinning. High efficiency for preparing ceramic fiber was achieved by the centrifugal spinning, in which the spinnable solution was dropped into rotating spinning disc. The zirconia was stabilized as the t-ZrO 2 and the grain size was decreased, because of the co-doping of yttria and alumina. The cyclic loading and thermal insulation tests indicated that the YADZ fibers has excellent compression resilience, high temperature resistance and thermal insulation performances. This work provides a feasible measure for the fabrication of zirconia fibers high efficiently with improved performance that can be applied to thermal insulation.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Zutao Zhang,Peiyuan Xiao,Jinping Mei,Xinyu Zhang,Duoduo Chen,Chenlu Jiang,Rong Huang,Qiufang Yao,Shiqing Sun
To address the challenge of high energy consumption (EC) in electrocatalytic nitrate reduction (ERN) for ammonia (NH 3 ) synthesis, this study proposes a dual strategy: engineering advanced anode materials and replacing the sluggish oxygen evolution reaction (OER) with the thermodynamically favorable urea oxidation reaction (UOR). A three-dimensional nanosheet Co-doped Ni 3 S 2 /NF (Co-Ni 3 S 2 /NF) self-supporting anode was prepared via a facile hydrothermal method. Co doping transformed the morphology from rod-like (Ni 3 S 2 /NF)) to nanosheet flower-like (Co-Ni 3 S 2 /NF), which quantitatively increased the BET surface area and electrochemical active surface area (ECSA) by approximately 7.6 and 14 times, respectively, thereby exposing a greater number of active sites. XRD revealed a ∼ 0.4° positive shift due to lattice contraction (Co 3+ radius 0.545 Å < Ni 2+ radius 0.69 Å), while a 3.1 cm −1 Raman shift indicated strengthened Ni S bonds and enhanced charge transfer. Consequently, the anode exhibited a large electrochemical active surface area (119.54 cm 2 ) and low charge-transfer resistance. It delivered superior catalytic activity, with an OER overpotential 86 mV lower than commercial Pt at 10 mA cm −2 , and a further 149 mV reduction when switched to UOR. Turnover frequency (TOF) analysis revealed that the enhanced performance originated predominantly from the increased density of active sites rather than their intrinsic activity. In combination with a Mn-CoNiP/NF cathode, UOR substitution reduced EC by 21.7 % while maintaining high NH 3 Faradaic efficiency (FE > 98 %), selectivity (SE > 95 %), and a yield rate of 1289.8 mg h −1 g −1 at −0.58 V vs. RHE. The system also demonstrated stable performance over 76 h. These findings highlight the potential of anode modulation via morphology engineering to lower energy demand in ERN, offering a sustainable strategy for efficient NH 3 production and nitrate remediation.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yi Wang,Pei Liu,Zhen Ding,Shuai Yin,Zhiqiang Li,Zhanpeng Liu,Fenghua Liu
To address the problem of narrow bandwidth in conventional electromagnetic wave (EMW) absorbing materials, which severely limits their practical applications. We proposed an integrated strategy that combined microstructural regulation of multi-dimensional composites with macroscopic structural design. A ternary Co/HNTs/GO composite was fabricated, in which one-dimensional halloysite nanotubes (HNTs) acted as a lightweight framework, two-dimensional graphene oxide (GO) established a conductive network, and Co nanoparticles introduced magnetic loss. This multi-dimensional synergistic architecture enhanced interfacial polarization, conductive pathways, and magnetic loss. After calcination optimization, the composite achieved a minimum reflection loss (RL min ) of −57.52 dB with an effective absorption bandwidth (EAB) of 5.02 GHz. Moreover, the absorption frequency was tuned across 4–18 GHz by varying the sample thickness from 2 to 5 mm. In addition, a step-pyramid structure optimized by electromagnetic simulation further expanded the EAB to 12.4 GHz (5.6–18 GHz), fully covering the X and Ku bands. This integrated material-structure strategy provided a promising paradigm for the rational design of broadband and high-performance EMW absorbers.
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ACTA MATERIALIA
·
2025
·
IF 9.3
Xing Fan,Zhongxiao Song,Yangyang Liu
The practical implementation of zinc (Zn) metal anodes in large-scale aqueous energy storage systems is severely hindered by interfacial instabilities, including dendritic Zn growth, parasitic hydrogen evolution, and self-corrosion. Here, we report a mechanism-driven interfacial design strategy guided by the mass–charge transfer equilibrium within the electric double layer, which dictates the Zn nucleation and growth behavior. Based on this insight, we construct a corrosion-resistant TaF x (TF) interphase via magnetron co-sputtering, which mitigates ion depletion near the Zn surface and promotes spatially uniform Zn electrodeposition. Concurrently, the TF layer elevates the energy barrier for hydrogen evolution and imparts robust corrosion resistance, thereby suppressing interfacial side reactions. These synergistic effects collectively enable planar, dendrite-free Zn deposition and stripping over 1,000 cycles with a high Coulombic efficiency of 99.87%. When integrated into a full-cell configuration with a NH 4 V 4 O 10 cathode, the TF-modified Zn anode retains 82.5% of its initial capacity after 250 cycles at a current density of 0.5 A g -1 . This work establishes a mechanistic framework for interfacial engineering of Zn metal anodes and offers a broadly applicable strategy for stabilizing high-performance AZIBs.
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IONICS
·
2025
·
IF 2.6
Li Zhongyong,Zhang Dandan,Xiao Dong,Fan Hui,Mishra Yogendra Kumar,Xiong Jian
As an iron-based fluorophosphate with a two-dimensional layered structure, Na₂FePO₄F (NFPF) has become an ideal cathode material for energy storage applications due to its low cost, high safety, and structural stability. However, the inherently low conductivity and limited kinetic behavior of NFPF result in inferior electrochemical performance, which hinders its commercialization. Herein, we employed a one-step carbon–nitrogen co-doping method to modify NFPF. First, carbon coating effectively enhances the conductivity of the NFPF cathode. Moreover, nitrogen doping introduces additional vacancies and active sites in the carbon layer, providing more Na⁺ diffusion channels. The NFPF/PVP material, synthesized using polyvinylpyrrolidone (PVP) as both the nitrogen and carbon source, delivers a specific capacity of 119 mAh g⁻ 1 at 0.1 C, an excellent rate capability of 90 mAh g⁻ 1 at 10 C, and unprecedented long-term cycling stability (81.9% capacity retention after 2000 cycles). These properties are significantly superior to those of previously reported NFPF cathode materials. Furthermore, electrochemical impedance spectroscopy (EIS) revealed that the charge transfer resistance of NFPF/PVP (123.59 Ω) is much lower than that of pristine NFPF (500.23 Ω), indicating facilitated charge transfer and faster Na⁺ transport kinetics. The Na⁺ diffusion coefficient of NFPF/PVP (4.78 × 10⁻ 11 cm 2 s⁻ 1 ) is two orders of magnitude higher than that of NFPF (3.35 × 10⁻ 13 cm 2 s⁻ 1 ), further demonstrating that the PVP-derived nitrogen-doped carbon coating effectively improves the reaction kinetics of NFPF. This study provides new strategies and insights for developing cost-effective and high-performance NFPF-based materials.
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ACS Nano
·
2025
·
IF 16
Shicheng Liu,Xi Chen,Jing Xiang Ng,Xiong Liu,Qulan Zhou,Na Li,Shuzhou Li
To address the challenge of competitive H2O adsorption in photocatalytic CO2 reduction, localized hydrophobicity-modified S-scheme heterojunctions (WS/o-CN) were synthesized by combining WS2 and g-C3N4, which was modified by the addition of CTAB. Structural characterization and contact angle testing confirmed the formation of S-scheme heterojunctions and the specific structural role of CTAB. The optical, electrochemical properties, and gas adsorption capacity of the catalysts were analyzed, followed by in situ XPS and fs-TA tests to investigate the energy band structure and electron transfer paths. These results showed that localized hydrophobic modification reduces the surface proton concentration while maintaining efficient electron–hole separation in the S-scheme heterojunction. Testing the photocatalytic activity of WS/o-CN showed that the yield of CO reached 23.24 μmol g–1 h–1 with a high selectivity of 74.7%. Combined with molecular dynamics simulations and in situ DRIFTS tests, the results demonstrated that the introduction of the nonpolar long carbon chain CTAB effectively inhibits the adsorption of heterogeneous H2O on the catalyst surface while enhancing the maximum adsorption of CO2. The localized hydrophobicity reduces the proton concentration on the surface of g-C3N4, which in turn suppresses the absorption of photogenerated electrons by the HER reaction. This facilitates the efficient and selective conversion of CO2 to CO. This study highlights a surface engineering strategy that couples electronic structure optimization with interfacial wettability control, providing valuable insights into the design of selective and efficient photocatalysts for CO2-to-CO conversion.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jia Shen,Qian Xiang,Yake Lou,Jiajie Ye,Yanglong Guo,Wangcheng Zhan,Li Wang,Xiao-Ming Cao,Aiyong Wang,Xuan Tang,Yun Guo
The preferential oxidation of carbon monoxide (CO-PROX) in rich hydrogen is a highly appealing technology for removing trace amounts of CO in hydrogen purification. Nevertheless, the requirements for realizing both a wide optimal working temperature range and high stability under industrial operating conditions remain a significant challenge. Here, we proposed a strategy for designing robust PtFe bifunctional catalysts stabilized by silanol nests on dealuminated Beta zeolite. The silanol nests formed upon dealumination effectively anchored Fe species, which subsequently facilitated the co-localization of Pt with the Fe sites. As a result, highly dispersed Fe species were stabilized in conjunction with Pt ensembles, achieving 100 % CO conversion within a wide working temperature range of 25 °C to 180 °C. Furthermore, this catalyst also demonstrates exceptional stability, maintaining 100 % CO conversion over 72 h of continuous CO-PROX operation under industrially relevant conditions (80 °C, in the presence of H 2 O and CO 2 ). Mechanistic investigations revealed that the high efficiency of O 2 utilization on the highly dispersed PtFe nanoparticles on dealuminated Beta zeolite not only promotes activity but also enhances stability for the CO-PROX reaction.
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