JOURNAL OF HAZARDOUS MATERIALS
·
2026
·
IF 10.6
Ruomu Chen,Yumeng Niu,Nan Li,Jingrui Peng,Ziqian Xia,Chenyang Wang,Jiandong Jiang,Kai Chen
Nitro-polycyclic aromatic hydrocarbons (nitro-PAHs) are toxic and persistent environmental contaminants of increasing concern because of their widespread occurrence and ecological risks. Nitronaphthalene, a representative nitro-PAH, occurs as positional isomers, yet microbial degradation studies have mainly focused on 1-nitronaphthalene (1-NN), leaving the basis for biodegradation of 2-nitronaphthalene (2-NN) largely unresolved. In this study, Burkholderia pseudomultivorans M3 was isolated from river sediment in Anhui Province, China, and was found to efficiently degrade both 1-NN and 2-NN, indicating an expanded degradation range for nitronaphthalene isomers. Genome analysis identified a novel nitronaphthalene degradation gene cluster ( nnd ) that is phylogenetically related to reported nin - and nag -type gene clusters but differs functionally from both. Gene knockout and complementation experiments demonstrated that nndAc , encoding the catalytic α-subunit of a Rieske-type dioxygenase, is essential for degradation of both isomers. Heterologous expression and metabolite identification further showed that the NndAB system transforms 1-NN and 2-NN into 1,2-dihydroxynaphthalene via the corresponding nitro-dihydrodiol intermediates, with concomitant nitrite release. Site-directed mutagenesis revealed that the ability of NndAc depends on the coordinated effects of multiple active-site residues, with F200 being particularly important for 2-NN transformation. Moreover, strain M3 maintained substantial removal efficiency in synthetic wastewater containing mixed nitro-, carboxyl-, and hydroxyl-substituted naphthalene compounds, supporting its applicability in complex contaminated matrices. These findings reveal the molecular basis underlying the broadened substrate range of nitronaphthalene degradation and highlight the potential of strain M3 for remediation of wastewater containing mixed substituted naphthalene pollutants.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·Vol. 60
·期 30
·21168-21179
·
IF 12.2
Chen Zhiqiang,Xie Xiaoqiang,Zhou Xincheng,Tu Xiang,Zhuo Fengqing,Ji Jian,Yu Fengbo,Li Guobo,Liu Wenming,Wei Lu,Deng Jiguang,Dai Weili,Peng Honggen
Water-induced deactivation of Pd-based
catalysts for
light alkane
combustion remains a significant challenge. Herein, S-1 zeolite-encapsulated
Pd–Pt bimetallic oxide nanoclusters were prepared for catalytic
propane oxidation. The optimized Pd 0.8 Pt 0.2 @S-1
catalyst exhibits exceptional water resistance with the propane oxidation
reaction temperature (T 90 ) shifting by a mere 9 ° C
in the presence of 5% H 2 O and fully recovering once the
water feed is terminated, superior activity, and thermal stability.
Combined experimental and theoretical insights reveal that the introduction
of Pt induces the formation of Pt–O–Pd bonds, modulating
the electronic structure of Pd to enhance surface hydrophobicity,
optimize oxygen and propane adsorption, and promote propane activation. In situ DRIFTS studies further confirm that propane oxidation
over Pd 0.8 Pt 0.2 @S-1 proceeds via a Mars–van
Krevelen mechanism. This work sheds new light on confined bimetallic
synergistic effects for the rational design of catalysts with superior
performance.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
·
2026
·
IF 4.7
Gao Xiaobo,Lei Bocheng,Zhao Xiaomin,Zhang Ying
Many active ingredients from traditional Chinese medicine (TCM) have been applied in bone tissue engineering. However, the fuzzy mechanism of these ingredients limits their application. In this study, a novel biomimetic bone scaffold functionalized with two TCM ingredients, nano deer bone meals (nBM) and neferine (Nef), as well as collagen-binding IGF-1 (CBD-IGF-1) was fabricated via a combination of phase inversion and particle leaching methods. The biomimetic CIGF1&Nef@PLGA/nBM scaffold mimicked cancellous bone in terms of its porous structure and bone matrix composition rich in collagen. Both Nef contained in the scaffold and CBD-IGF-1 bound to collagen matrix could be slowly released from the scaffold, exerting long-term and safe bioactivity. In vitro tests showed that the CIGF1&Nef@PLGA/nBM composite significantly enhanced the adhesion, proliferation and osteogenic differentiation of MC3T3-E1 cells on the material. Nef and IGF-1 in CIGF1&Nef@PLGA/nBM scaffold exerted a synergistic effect on IGF-1-mediated osteogenic differentiation via IGF-1R axis to ensure the osteogenic activity of the biomimetic scaffold. In vivo skull defect repair experiment confirmed that CIGF1&Nef@PLGA/nBM could promote the neocortical bone formation and osseous maturation, further accelerating the bone defect repair. The findings of this research demonstrated that the biomimetic CIGF1&Nef@PLGA/nBM scaffold is a promising implantation in bone defect therapy.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Qi Zhang,Dongsheng He,Wei Xu,Yanhong Fu,Yuan Tang,Zhili Li,Wanqing Li,Jiayu Ma,El-Sayed R.E. Hassan
[C 8 mim]Br selectively floats quartz (88.13%) over fluorapatite (4.43%) at pH 7.01. • Binary mixture flotation with [C 8 mim]Br achieves a P 2 O 5 grade of 31.49% with 91.59% recovery, confirming superior selectivity over conventional DDA. • [C 8 mim] + selectively adsorbs on quartz via electrostatic attraction with Si-O − sites and C–H···O hydrogen bonding with silanol groups, while fluorapatite lacks these active sites. • Short-chain imidazolium ionic liquids serve as promising collectors for reverse flotation desilication of phosphate ores, offering a new reagent strategy for phosphate mineral processing. The reverse flotation separation of quartz from fluorapatite using 1-octyl-3-methylimidazolium bromide ([C 8 mim]Br) ionic liquid as a novel collector was investigated, with dodecylamine (DDA) employed as a benchmark. Micro-flotation tests showed that [C 8 mim]Br selectively collected quartz (88.13%) with negligible flotation of fluorapatite (4.43%) at pH 7.01 and 50 mg/L, demonstrating superior selectivity over DDA. Binary mixture flotation (fluorapatite: quartz = 1:1) achieved a P 2 O 5 grade of 31.49% with a recovery of 91.59%. Zeta potential and contact angle measurements revealed that [C 8 mim]Br increased the zeta potential of quartz by 14.05 mV and enhanced its contact angle from 19.41° to 79.75°, while exerting minimal influence on fluorapatite. Microcalorimetry demonstrated that the adsorption heat of [C 8 mim]Br on quartz (0.237 J/g) was significantly higher than that on fluorapatite (1.6 × 10 −3 J/g). FTIR and XPS analyses indicate that [C 8 mim]Br is adsorbed on the quartz surface mainly through electrostatic attraction between the imidazolium cation and deprotonated Si-O − sites. The optimized configuration obtained from DFT calculations shows that C-H···O hydrogen bonds exist between the protons at the C4/C5 positions of the imidazole ring and surface oxygen atoms (H···O = 1.971 Å, C-H···O = 141°), whereas no stable adsorption configuration is obtained on the fluorapatite surface. These findings demonstrate that [C 8 mim]Br is a promising selective collector for the reverse flotation desilication of siliceous-calcareous phosphate ores. [C8mim] + adsorbed on the quartz surface through electrostatic attraction with deprotonated Si-O − sites, supplemented by hydrogen bonding between the C–H proton and surface silanol groups. In contrast, the fluorapatite surface lacks such active sites for anchoring of [C8mim]+, which accounts for the selective separation. Download: Download high-res image (120KB) Download: Download full-size image
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PLANT BIOTECHNOLOGY JOURNAL
·
2025
·
IF 10.5
Shu-Yue Zhang,Jian-Qiang Kong
Summary OSW-1 is a cholestane saponin uniquely produced in Ornithogalum saundersiae and exhibits a potential antitumor activity. The enzymes responsible for OSW-1 biosynthesis in O. saundersiae , however, remain unclear. Herein, cholesterol was confirmed to be the precursor of OSW-1 using stable-isotope labeling method. Next, two cytochrome P450s, Os CYP90B94 and Os CYP90G11, and their partner cytochrome P450 reductase Os CPR2 were mined by comparable transcriptome analysis and demonstrated to be involved in OSW-1 biosynthesis. Specifically, Os CYP90B94 catalyses cholesterol to 22 R -hydroxycholesterol, which is then converted to 16 β -hydroxy-22-oxo-cholesterol, a precursor of OSW-1 by the second P450 O sCYP90G11 via two consecutive oxidation reactions. Unlike their homologues, Os CYP90G11 and Os CYP90B94 displayed broader catalytic promiscuity. Os CYP90B94 recognizes both cholesterol and 7 β -hydroxycholesterol, while Os CYP90G11 can react with cholesterol, 22 R -hydroxycholesterol and 16 β ,22 R -dihydroxycholesterol, suggesting their involvement in more than one pathway besides OSW-1 biosynthesis. This study lays a foundation for the complete characterization of OSW-1 biosynthesis.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Jun Liu,Yongpeng Chen,Xiuyan Zhang,Zhenye Ma
In this article, copper-based metal organic framework (MOF) HKUST-1 was synthesized via room temperature stirring method, and a series of HKUST-1/AP composite particles with different mass ratios were prepared via mechanical grinding method; The morphology and structure of the prepared HKUST-1 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), and the particle size data were measured by laser particle size analyzer; Thermogravimetric analysis-differential scanning calorimetry (TG-DSC) was employed to evaluate the catalytic activity of HKUST-1 during AP thermal decomposition. The results revealed that variations in copper salt type exerted a marked influence on HKUST-1's powder particle size. The addition of 4 % HKUST-1-C, HKUST-1-S, HKUST-1-N, and HKUST-1-Cl respectively reduces the high-temperature decomposition (HTD) temperature of AP by 113.5 °C, 113.1 °C, 107.4 °C, and 107.7 °C. Concurrently, the heat release of AP undergoes a dramatic increase, rising from the initial 415.71 J/g to 1188 J/g, 1181 J/g, 864.8 J/g, and 856.8 J/g for each corresponding sample. Among them, HKUST-1-C demonstrated superior catalytic performance, characterized by a remarkable reduction in the HTD of ammonium perchlorate by 110.8 °C with only a 2 % addition. Notably, this catalyst enhanced heat release by 750.3 J/g and decreased the reaction activation energy by 66.9 kJ/mol, thereby significantly improving the overall thermodynamic efficiency of the system.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Qi Liu,Yihan Yin,Hongxia Gao,Lianbo Liu,Shisen Xu,Teerawat Sema,Min Xiao,Zhiwu Liang
Amine degradation is one of the key issues that hampers the implementation of large-scale carbon capture technology. Degradation inhibitors can extend the lifetime of amine solutions, thereby lowering the operating cost of CO 2 capture system in the long term. In this work, different inhibitors including chelating agents, scavengers, and their blends were studied to inhibit the oxidative degradation of 1-amino-2-propanol (1AP). Amine loss, alkalinity loss, NH 3 emissions and heat-stable salt production were measured to evaluate the inhibitory effect. The parameter, namely inhibition factor, was proposed to quantify the effect of inhibitors. Two chelating agents were found to show good inhibitory effects on 1AP degradation, with inhibition factors of 7.1 and 4.3, respectively. In addition, the inhibition factor was increased to 9.4 by blending the inhibitors. A significant reduction in the inhibitor dosage was applied to achieve a similar inhibiting effect due to the excellent synergistic effects between the blended inhibitors.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xinlei Shen,Chun Tong,Haikui Zhu,Yigang Qian,Lixi Wang
(1- y )Ca 0.97 Sr 0.03 B 2 O 4 - y TiO 2 composite ceramics were produced through a solid-phase reaction procedure, ensuring that all samples had a uniform and dense microstructure, where each constituent phase exhibited complete crystallinity. Their crystal structures, microwave dielectric properties, microstructures, and co-sintering performance at low temperatures were thoroughly investigated. To enhance the thermal stability of the resonant frequency, rutile TiO 2 ( τ f = +450 ppm/°C) was introduced as an additional phase during the preparation of the composite ceramics. According to the XRD analysis, the characteristic peak signals became more pronounced as the content of rutile TiO 2 in the composite gradually rose, and the peak intensity was found to vary linearly with the relative content of TiO 2 . SEM analysis revealed that the TiO 2 additions ( y = 0.05, 0.10, and 0.15) resulted in tightly arranged grains, the absence of visible pores, and a high degree of densification. However, as the TiO 2 content increased ( y = 0.20, 0.25), pores appeared, grain boundaries became more pronounced, and densification decreased. At y = 0.15 and a sintering temperature of 900 °C, the best dielectric properties were achieved for the (1- y )Ca 0.97 Sr 0.03 B 2 O 4 - y TiO 2 composite ceramics: ε r = 7.61, Q×f = 33,983 GHz, and τ f = +3.51 ppm/°C. By introducing TiO 2 , the initially negative τ f was effectively adjusted toward zero, thereby achieving greater thermal reliability. Additionally, the absence of interfacial chemical reactions between the composite ceramic and the silver after co-firing indicates that the material possesses favorable chemical compatibility with silver, demonstrating strong applicability in LTCC technology.
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ACS Catalysis
·
2025
·
IF 13.1
Yousheng Zhou,Chuanlei Liu,Peicheng Li,Yifan Wang,Qiyue Zhao,Hao Jiang,Qiumin Wu,Benxian Shen,Hui Sun,Xuejiao Han
Olefin oligomerization plays a pivotal role in producing value-added chemicals and functional materials, driving the development of the chemical industry. Acid catalysts are widely utilized in olefin oligomerization, yet precisely controlling acidity remains a significant challenge due to the considerable difficulties in regulating the complex coordination of the active components with the supports. In this study, a series of Al-modified dendritic fibrous nanosilica catalysts (Al-DFNS) were synthesized and applied in the oligomerization of 1-decene to polyalphaolefins (PAOs). Multiple characterizations elucidate that the hydrogen-replaced Al-DFNS (H-Al-DFNS) featured a unique three-dimensional center-radial channel with hierarchical pores, while pulsed-field gradient nuclear magnetic resonance (PFG-NMR) further indicates that the high density of accessible acidic sites and diffusion-limited pore properties lead to much higher catalytic efficiency than diverse siliceous catalysts. Acid distribution measurement and product analysis together reveal that H-Al-DFNS has a well-balanced ratio of Brønsted acid sites (BAS) to Lewis acid sites (LAS). Specifically, high acid strength enhances hydrogen transfer and contributes to high selectivity of trimer and reduced dimer production. Density functional theory (DFT) calculation highlights the crucial role of the stability of carbocation intermediates on acid sites in the oligomerization reaction. The present work provides a reliable strategy for accurately regulated acidity for tunable oligomerization product distribution and initiates the applications of a kind of promising catalytic material in olefin oligomerization.
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Molecular Medicine Reports
·
2026
·Vol. 33
·期 4
·1-14
·
IF 5
Xiaoyu Zheng,Jinping Li,Tianyang Hu,Li Tan,Ding Lan,Ying Deng
Covers molecular medicine topics such as pharmacology, pathology, genetics, neuroscience, infectious diseases, molecular cardiology, and molecular surgery.
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Nature Synthesis
·
2026
·
IF 22.6
He Feng,Lopez-Haro Miguel,Chen Tianxiang,Marini Carlo,Dou Xiaomeng,Wang Quan-Ming,Liu Lichen
Synthesis of hierarchical zeolites has been proven to be an effective strategy for improving reactant accessibility to active sites and extending catalyst lifetimes. Existing synthesis methods typically generate mesopores within zeolite crystallites instead of inside zeolites with an open-structure porosity. Here we have developed a general synthesis method by optimizing the crystallization conditions and molecular structures of the polymer template and linkage reagent, resulting in the formation of hierarchical MFI-, MEL-, BEA- and CHA-type zeolites with open porosity formed by highly interconnected microporous channels. Based on this method, we prepare a hierarchical TS-1 zeolite with open porosity as a support for a gold catalyst. The resultant Au/TS-1 catalyst exhibits high activity and stability for the direct epoxidation of propylene with H 2 and O 2 , which is associated with the intimate contact between the gold and titanium sites and the zeolite’s unique pore structure.
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ANALYTICAL CHEMISTRY
·
2026
·
IF 7.3
Qing Kang,Yidi Liu,Xiubing Cui,Jianming Chu,Tong Lin,Jingbo Jiao,Xinjun Du,Shuo Wang
Herein, we developed a novel “4 + 1” biosensing platform based on cascaded nucleic acid amplification and nanozyme activity, enabling fluorescence-colorimetric dual-mode detection and efficient inactivation of Salmonella Typhimurium (S. typhimurium). The “4 + 1” system incorporates a multi-component strategy featuring multivalent aptamers for enhanced target recognition, coupled with a quadruple signal amplification strategy involving exponential amplification reaction (EXPAR), hybridization chain reaction (HCR), multivalent aptamers, and functional nanozymes (Fe3O4 and Fe-PDs), thereby achieving synergistic antibacterial effects. It achieves a wide linear range of 3 × 101–3 × 107 CFU/mL, with detection limits of 7.7 CFU/mL for fluorescence and 8.7 CFU/mL for colorimetry. Furthermore, the system exhibits antibacterial capability by catalytically generating reactive oxygen species (ROS), reducing the risk of secondary contamination. When applied to spiked milk samples, the biosensor showed satisfactory recovery rates and reproducibility. The study provides a high-precision, low-cost analytical solution for detecting and inactivating foodborne pathogens, demonstrating significant potential for rapid on-site food safety monitoring.
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