ACS Catalysis
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2026
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IF 13.1
Jie Li,Pengpeng Shao,Peng Lei,Di Zhang,Chengpeng Liu,Shilu Chen,Yingnan Chi,Changwen Hu
Proton shuttles play a vital role in diverse chemical transformations; however, most known examples, such as water and small organic molecules, operate in homogeneous systems with colocated proton donor and acceptor sites. In contrast, recyclable proton shuttle catalysts with spatially separated donor and acceptor sites are highly desirable due to their enhanced flexibility in proton transfer but remain largely unexplored. Herein, we identify the polyoxoniobate K7HNb6O19·13H2O (KNb6) as a special type of recyclable proton shuttle catalyst that enables rapid cleavage of lignin β-O-4 ketone into value-added phenol (yield: 93%) and benzonitrile (yield: 73%) within 10 min, using NH2OH·H2O as the N-source. Combined computational and experimental studies reveal that the unique surface of KNb6, featuring a proton-donating hydroxyl group (−OH) surrounded by multiple proton-accepting oxo ligands (O2–), facilitates a proton-shuttling mechanism that drives both Cβ–O and Cα–Cβ bond cleavage of a ketoxime intermediate formed in situ. Moreover, KNb6 maintains a stable catalytic performance over multiple cycles and efficiently promotes the depolymerization of oxidized natural lignin. This work not only provides a robust and recyclable catalyst for biomass valorization but also offers insights into the design of recyclable proton transfer systems.
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Nanomaterials
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2026
·Vol. 16
·期 7
·398
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IF 4.8
Weiao Li,Litiao Ren,Yuqi Zhao,Xinping Cong,Mingjin Zhang,Yan Liu,Qihui Shen,Xiaoyang Liu
Herein, an electrochemical sensor is reported for the first time based on an ordered macro–microporous composite derived from metal–organic frameworks (MOFs) for the highly sensitive detection of auramine O (AO), a Group 2B carcinogen. The hierarchical pore architecture, integrating an ordered macroporous network with a microporous ZIF-8 framework, enables the uniform dispersion of a high density of catalytically active sites. The interconnected macroporous channels facilitate efficient mass transport and rapid removal of reaction byproducts, effectively preventing pore blockage and ensuring stable sensing performance during repeated measurements. Owing to these structural advantages, the proposed sensor exhibits outstanding analytical performance toward AO detection, with a sensitivity of 0.4843 μA μM−1, a detection limit of 0.168 μM (S/N = 3), and a wide linear range from 0.5 to 50 μM. Moreover, the sensor demonstrates excellent selectivity and reproducibility, maintaining reliable responses even in the presence of 100-fold excess common food constituents such as tartrazine and glucose. Real sample analysis further confirms its high accuracy and operational stability. Overall, the electrochemical sensor based on silver nanoparticle-decorated ordered macro–microporous ZIF-8 synthesized via in situ reduction shows great potential as a portable and on-site tool for rapid AO detection in food. More broadly, ordered macro–microporous MOF-derived materials represent a promising platform for advanced electrochemical sensor applications.
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FUEL
·
2026
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IF 7.8
Haoxuan Tan,Jianhao Jiao,Yun Zu,Qiang Li,Yucai Qin,Ye Yang,Kai He,Zhongxing Geng,Lijuan Song
Silica-supported tungsten oxides (WO x /SiO 2 ) as industrial catalysts are widely applied for the metathesis of ethylene and butylene to propylene, yet often suffer from limited dispersion and stability due to ill-defined interactions between tungsten species and surface silanols microenvironment of silica support. In this work, the type and density of specific surface silanols in silica were successfully tailored by precisely controlling thermal pretreatment temperature. Multiple advanced characterizations and theoretical calculations revealed that vicinal-silanol-rich surface microenvironments were strongly associated with the formation of highly dispersed and stable isolated dioxo W (VI) -O-Si structure, while effectively suppressing the formation of less-active W-O-W aggregates. Under the comparable conditions, the optimized WO x /SiO 2 ‑ 550 catalyst with rich W (VI) -O-Si sites delivered an enviable propylene yield of over 67.9% in the olefin metathesis with a lower deactivation rate (0.069 h −1 ), far outperforming conventional catalysts. Moreover, the catalyst demonstrated satisfactory long-term stability over 200 h on stream and partial activity recovery upon oxidative regeneration. Mechanistic studies further suggested that the dioxo W (VI) -O-Si structure enhanced the adsorption and activation of olefins and favored the formation of surface species consistent with literature-proposed metal‑carbene intermediates, thereby improving both catalytic activity and propylene selectivity. These findings provide a fundamental understanding and a practical strategy for the rational design of highly-dispersed and stable supported tungsten catalysts for olefin metathesis.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Jiale Ni,Ziyang Xu,Huiduo Li,Yi Feng,Jianfeng Yao
Hierarchical three-dimensional (3D) porous architectures are critical for overcoming mass-transfer limitations in catalytic CO 2 conversion, yet their scalable integration with atomically dispersed active sites remains challenging. Herein, we report a facile precursor-anchoring strategy to fabricate monolithic Zn, N, O-codoped porous carbon (ZnNC-900) via carbonization of melamine sponge uniformly coated with a Zn 2+ -polydopamine layer. The melamine sponge provides a continuous 3D macroporous network that facilitates efficient reactant flow, whereas dopamine-mediated chelation generates Zn and N sites along with oxygen functionalities. This unique structure not only enhances the adsorption and activation of both CO 2 and epoxides but also enables a pronounced synergistic photothermal-photocatalytic effect under light irradiation. Under mild conditions of either thermal (80 °C, 0.1 MPa) or room-temperature light irradiation (350 mW/cm 2 ), ZnNC-900 achieves a high yield of >99% within 12 h for CO 2 cycloaddition with epichlorohydrin. Furthermore, the catalyst displays robust stability and broad substrate tolerance, underscoring its practical potential for CO 2 fixation.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2026
·
IF 12.2
Yunpeng Xue,Lu Li,Yuren Wang,Yuchen Xiong,Min Deng,Kang Song
Abstract Lake biofilms are microbial habitats for nitrogen transformation, but how carrier type and elevation influence N2O dynamics remains unclear. We examined abiotic- and biotic-carrier biofilms from 12 lakes spanning 4–4272 m using anoxic incubations, 15N tracing, selective inhibition, isotopocule analysis, and metagenomics. Net N2O emission potential increased with elevation in both carrier types, with the largest carrier contrast at high elevation, where biotic-carrier biofilms showed the highest net N2O emission potential. 15N partitioning showed a marked shift in emission sources. At low elevation, heterotrophic nitrification dominated abiotic-carrier biofilms (∼91%), whereas denitrification contributed ∼57% in biotic-carrier biofilms. At high elevation, denitrification accounted for 67–97% of net N2O emission across both carriers, and bacterial denitrification dominated the total denitrification rate potential. Metagenomic profiles provided mechanistic support: high-elevation biotic-carrier biofilms showed higher relative representation of genes for dissimilatory nitrate reduction to ammonium and nitrogen fixation, but had few nosZ-carrying genomes, indicating weak terminal N2O reduction capacity. Overall, carrier type and elevation jointly shape nitrogen transformation pathways. High-elevation lake ecosystems, particularly those with abundant biotic substrates, may harbor disproportionately important biofilm N2O hotspots under global change.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.7
Xiaofang Ma,Yuxin Han,Xiaxia Liu,Yan Sun,LuXia Guo,Yang Gao,Yuanyuan Tian,He Xiao
RuNi nanoclusters confined in hollow mesoporous carbon are synthesized by a template-impregnation method. • RuNi/MCS-3 delivers superior alkaline HER performance comparable to commercial Pt/C. • Formed Ru−O−Ni bridge accelerates water dissociation and optimizes H* adsorption. • Pore confinement and electronic synergy offer a strategy for advanced HER electrocatalysts. Developing efficient and stable bimetallic electrocatalysts for the hydrogen evolution reaction (HER) in alkaline media is crucial for sustainable water splitting. However, this field still faces substantial challenges. Herein, a series of hollow mesoporous carbon-confined RuNi bimetallic nanocluster catalysts (RuNi/MCS-x) were synthesized via a facile combination of the template method and impregnation strategy. Their electrocatalytic HER performance was systematically evaluated in 1 M KOH solution. Notably, the MCS-3 material, prepared at a TPOS/TEOS volume ratio of 1:1, exhibits an optimal porous structure with a large pore size of 5.64 nm and a high specific surface area of 631.34 m 2 g −1 . The interconnected porous structure, linking the internal hollow cavities to the outer surface, provides sufficient transport channels for electrolyte penetration and hydrogen release. Benefiting from these structural advantages, the RuNi/MCS-3 catalyst delivers excellent alkaline HER performance. It requires only an overpotential of 15.6 mV to achieve a current density of 10 mA cm −2 in 1 M KOH electrolyte and displays a high mass activity of 651.4 mA mg Ru −1 at an overpotential of −50 mV. In addition, RuNi/MCS-3 achieves a Faradaic efficiency (FE) close to 100%, and its turnover frequency (TOF) is comparable to that of commercial Pt/C catalysts. The superior catalytic activity originates from three synergistic factors. First, the unique Ru−O−Ni bridging structure creates abundant electron-rich oxygen sites to promote water dissociation, optimize H* adsorption, and accelerate hydrogen desorption kinetics. Second, the pore confinement of hollow mesoporous carbon facilitates uniform dispersion of RuNi nanoclusters and full exposure of active sites. Third, the Ru−O−Ni bridge facilitates electron transfer and lowers the kinetic barrier of the alkaline HER, thereby substantially boosting the overall water-splitting efficiency. This work presents a feasible innovative strategy to rationally design and fabricate high-efficiency bimetallic carbon electrocatalysts toward high-performance HER. Download: Download high-res image (142KB) Download: Download full-size image The mesoporous carbon-confined RuNi bimetallic nanoclusters (RuNi/MCS-3) construct interfacial Ru–O–Ni bridges, which induce electron redistribution and trigger hydrogen spillover to optimize hydrogen adsorption/desorption kinetics. Benefiting from the interfacial synergistic effect, RuNi/MCS-3 exhibits substantially enhanced electrocatalytic hydrogen evolution activity compared with monometallic Ru/MCS-3.
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MICROCHEMICAL JOURNAL
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2026
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IF 5.2
Xing-hong Pan,Renagul Abdurahman,Xu-yang Guo,Rui-hong Xu,Tao Li,Ming Guan,Xue-Bo Yin
For the first time, the MnO 2 @MgGa 2 O 4 composite material was made and synthesized. • Using MgGa 2 O 4 phosphorescence and MnO 2 peroxidase activity, aniline and o-toluidine can be detected simultaneously. • On-site aniline and o-toluidine testing with a mobile analysis tool on a smartphone. • The wearable patch sensor makes it easy to detect aniline and o-toluidine. Aniline and o-toluidine are crucial biomarkers for lung cancer, so their detection becomes significant for healthcare. Here we developed a stable, accurate, and sensitive wearable nanozyme patch based on MnO 2 @persistent luminescent nanoparticles (MnO 2 @PLNPs) for the detection of aniline and o-toluidine. MgGa 2 O 4 :0.1%Zn 2+ (MZGO) with the emission at 710 nm were first prepared and then loaded MnO 2 nanozyme as MnO 2 @PLNPs. The composite was embedded in polyvinyl alcohol (PVA) matrix to obtain the wearable nanozyme patch. MnO 2 exhibit broad band absorption in 300–800 nm for quenching the red phosphorescence of PLNPs. Upon the introduction of aniline and o-toluidine, MnO 2 nanozyme reacts with both analytes and degrades as Mn 2+ . Thus, the long-afterglow emission of PLNPs is recovered and this dual change enables detection of aniline and o-toluidine with a detection limit of 0.9 mmol with the phosphorescence at 710 nm and color change. Additionally, analyzing the RGB values of the reaction using a smartphone allows in-site determination of aniline and o-toluidine for early alert of lung cancer. Download: Download high-res image (117KB) Download: Download full-size image
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Zhuoran Song,Daohu Sheng,Siyao Cheng,Mengmeng Zhang,Aming Xie
The development of two-dimensional (2D) metal composite materials for electromagnetic wave (EMW) absorption is hindered by complex fabrication processes, high raw material costs, and insufficient absorption performance. We ingeniously integrate a multi-metal doping strategy with the oxygen-rich two-dimensional structure of p(C₃O₂)ₓ to successfully construct a defect-rich two-dimensional metal composite microwave absorber. Spectroscopic analysis reveals that multi-metal doping and oxygen release during pyrolysis generate abundant heterogeneous interfaces (oxides/alloys) and induce pronounced electron delocalization, promoting lattice distortions and defect formation. This synergistic effect significantly enhances both local dipole and interfacial polarization, boosting dielectric response. Consequently, the optimized OC-FeMnCuCo sample achieves exceptional EMW absorption with a minimum reflection loss (RL min ) of –55.0 dB and a broad effective absorbing bandwidth (EAB) of 6.8 GHz at an ultra-thin thickness of 1.9 mm. CST simulations further confirm its practical applicability. This work provides a simple, cost-effective strategy for designing advanced 2D absorbers.
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JOURNAL OF CATALYSIS
·
2026
·
IF 6
Huaibiao Wang,Tianxiu He,Churu Zhang,Yanyan Deng,Wenjun Quan,Ruoning Liu,Qingcai Zou,Chunye Chen,Yunfei He,Shaoyun Shan,Tianding Hu
Copper-based catalysts for hydroboration typically rely on air-sensitive Cu(I) species to achieve high activity, whereas Cu(II)-only systems remain largely ineffective due to their limited intrinsic reactivity. Herein, we present an intramolecular N/O competitive coordination strategy to construct a metal–organic framework (MOF) with multiple active Cu(II) sites (Cu-3,5-PyDC). This framework incorporates three distinct Cu(II) coordination environments: [Cu 2 -O 8 ], [Cu-N 2 O 2 ], and [Cu-N 3 ], which regulate the local electronic microenvironment of Cu(II) and significantly enhance its catalytic functionality. Consequently, Cu-3,5-PyDC is capable of completing the hydroboration of 25 terminal alkyne substrates within 5 min, achieving a turnover frequency up to 3046 h −1 . Combining deuterium experiments with density functional theory (DFT) calculations further reveals the synergistic interaction of multiple Cu(II) sites in the proton-hydrogen transfer pathway, which effectively lowers the reaction energy barrier. This work establishes the effectiveness of intramolecular N/O competitive coordination strategies for precisely constructing multiple active sites within MOFs, providing a rational design approach for the targeted development of multifunctional materials.
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Frontiers in Plant Science
·
2026
·
IF 5.9
Xue Wu,Shimin Liu,Zhongcheng Guo,Fengfeng Zhang,Tianze Liu,Yuqing Dou
The aromatic characteristics of cigar tobacco leaves are the result of the release of aromatic compounds, but research on the distinctive aromatic profiles of cigars has been limited. This study employed GC–IMS combined with PCA to reveal differences in volatile components in cigar tobacco leaves. Additionally, HS-SPME and SBSE were used to extract volatile components from cigar tobacco leaves, which were then identified using GC–O–MS. Based on odor activity values, 15 out of 120 compounds were classified as aromatic active compounds. GC-IMS and GC-MS experiments indicated that “fatty” “grass” “fruity” “ammonia” “citrus” “chocolate odor” and “mint and camphor” were identified as characteristic aromatic attributes of cigar tobacco leaves. These characteristic aromas were associated with compounds such as Ammonia, 3-Methylbutanal, Pentanal, 2-Butanone, D-limonene, Nonanal, 6-Methyl-5-heptadiene-2-one, Geraniol and Neophytadiene. This study provides insights into improving cigar quality and promoting the development of new products with unique aromatic characteristics.
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WATER SCIENCE AND TECHNOLOGY
·
2026
·
IF 2.8
Wu Wei,Ma Xiaoqian,Wang Rui,Hao Mengqi
View large Download slide View large Download slide Close modal This paper delves into the impact of electrostatic interaction and wettability of MNPs on the efficiency of demulsifiers. Fe 3 O 4 magnetic nanocomposites (Fe 3 O 4 /HA/PDDA/OLA MNPs, S1–S5) were synthesized with varying wettability and zeta potential by adjusting the surface modification ratio of poly-dimethyl-diallyl-ammonium chloride (PDDA) and oleylamine (OLA). S1–S5 were then used to demulsify O/W (hexadecane) nanoemulsions. The oil/water separation efficiency (SE) initially increased (S1–S4) and then decreased (S4–S5) with their increasing water contact angles (WCA). S4 with a WCA about 90° exhibited the maximum SE, although S4 has a negative charge and shows electrostatic repulsion with oil droplets, indicating that the wettability of MNPs, rather than electrostatic interaction, played a dominant role in demulsification. Adsorption energy of S1–S5 at the water–oil interface aligned with the variation in their demulsification efficiency. Based on previous reports, a possible demulsification mechanism was proposed. Hydrogen bond and hydrophobic long chains present in PDDA and OLA increased the interfacial activity of S4, which facilitated the spontaneous migration of MNPs to the interface of oil and water. With oil droplet aggregation by magnetic recovery, a good oil–water separation performance was achieved. The study provides a theoretical foundation for the design and synthesis of magnetic demulsifiers. Wettability of MNPs plays a crucial role in demulsification performance. Surface charge of MNPs shows less function than wettability. MNPs with a WCA of approximately 90° showed the maximum demulsification efficiency. The study provides a theoretical foundation for the design and synthesis of magnetic demulsifiers.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Huizhong Ma,Yulong Wang,Mengling Hong,Hongfei Yin,Honglei Yuan
A novel Co SA-N,O-CQDs/g-C 3 N 4 (CoCCN) single-atom nano-island is synthesized for PMS activation. • 1 O 2 is identified as the dominant reactive species responsible for pollutant degradation. • DFT calculations elucidated that the N,O-CQD optimize charge transfer, reducing the energy barrier for 1 O 2 generation. The persistent contamination of aquatic ecosystems by antibiotic pollutants such as tetracycline hydrochloride (TCH) necessitates advanced oxidation processes (AOPs) for effective remediation. Peroxymonosulfate (PMS)-based AOPs offer high oxidation potential but face challenges in catalyst design, such as the conflict between catalytic activity and durability, as well as metal leaching. Herein, we developed a novel single-atom nano-island (SANI) catalyst composed of cobalt single atoms anchored on N,O co-doped carbon quantum dots (N,O-CQDs) nano-islands supported on g-C 3 N 4 , denoted as CoCCN. This configuration utilizes robust interactions between metal and support to simultaneously boost durability and facilitate PMS activation. The CoCCN catalyst achieved 98.3% TCH degradation within 40 min, with a kinetic constant (k obs = 0.0873 min −1 ) 2.66-fold higher than that of CoCN/PMS and 15.9-fold higher than CN/PMS. Mechanistic exploration uncovered that singlet oxygen ( 1 O 2 ) is the dominant reactive species responsible for pollutant degradation. Density functional theory (DFT) calculations further elucidated that the N,O-CQD nano-islands optimize charge transfer, reducing the energy barrier for 1 O 2 generation. The catalyst maintained 94.1% efficiency over ten cycles with minimal cobalt leaching, highlighting its robustness across a pH range of 3–10. This work provides a synergistic strategy to overcome activity-stability conflicts in single-atom catalysts for environmental applications. Download: Download high-res image (162KB) Download: Download full-size image
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