Molecular Catalysis
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2026
·
IF 4.3
Junyan Chen,Bin Guan,Lei Zhu,Tiankui Zhu,Shiying Chang,Jiangli Ma,Rong Wang,Qingji Ying,Dongxia Yang,Zhen Huang
Ag-loaded KFI-type ZK-5 zeolites with tunable Si/Al ratios serve as hydrocarbon traps for gasoline cold-start control. • SAR2.5: highest C₂H₄ capacity (623 μmol/g); SAR5: superior C₇H₈ adsorption (850 μmol/g), higher desorption temperature. • Dual regulation of Si/Al ratio on zeolite crystallinity and Ag speciation clarifies structure–performance correlation. • In-situ DRIFTS reveals pathways: π-complexation for ethylene and synergistic hydrogen-bonding/π-complexation for toluene. Cold-start hydrocarbon (HC) emissions from gasoline engines remain a critical challenge in automotive exhaust purification, as three-way catalytic converters remain inactive below their light-off temperature. Ag-modified zeolites are promising HC trap materials, yet the structure–performance relationship regulated by the silica-to-alumina ratio (SAR) requires further systematic clarification. In this work, Ag/ZK-5 zeolites with SAR values of 2.5, 5, 10, and 20 were fabricated via the ion-exchange method, and their adsorption–desorption properties for ethylene and toluene were evaluated in combination with multi-technique characterizations and in-situ DRIFTS analysis. The results demonstrate that SAR exerts a well-defined dual regulatory effect on two interconnected levels: the zeolite framework (crystallinity, textural properties, and surface acidity) and the supported silver species (loading, chemical state, and dispersion degree). The SAR2.5 sample achieves the highest ethylene adsorption capacity of 623 μmol/g owing to its abundant ionic Ag⁺ sites, but suffers from severe silver agglomeration and limited toluene uptake. The SAR5 sample delivers the optimal comprehensive performance, with a toluene adsorption capacity of 850 μmol/g and desorption temperatures for both hydrocarbons higher than those of both the lower-SAR SAR2.5 and the higher-SAR SAR10/SAR20 counterparts, which benefits from its well-preserved crystallinity, highly dispersed Ag⁺ active sites, and balanced pore structure and surface acidity. High-SAR samples (SAR10, SAR20) exhibit inferior adsorption performance for both hydrocarbons due to framework amorphization and poor silver dispersion. In-situ DRIFTS characterizations reveal that ethylene adsorption follows a π-complexation pathway with partial oxidative transformation, while toluene adsorption is driven by the synergism of O–H···π hydrogen bonding and π-complexation. This work provides experimental guidance for the rational design of zeolite-based HC traps for cold-start emission control. Download: Download high-res image (155KB) Download: Download full-size image
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Wenjing Miao,Xiaomin Liu,Bin Li,Yufeng Wu,Wei Zhang,Wei Wang
This study addresses the challenges in recycling rare earth polishing powder waste (REPPWs)—such as harsh leaching conditions, poor morphology control, and low value-added output—by proposing a synergistic “leaching-morphology control-zeolite loading” strategy. This approach enabled the successfully synthesize of flower-like Ce Ov La/HZSM-5 composite catalyst using polishing powder as the primary raw material. This strategy involves three key elements: 1) co-leaching Ce 3+ /La 3+ with a H 2 SO 4 -ascorbic acid system, 2) precisely constructing Ce Ov La with abundant oxygen vacancies (Ovs) via controlled oxalic acid addition, and 3) obtaining the final catalyst by in-situ HZSM-5 growth on the Ce Ov La. Density functional theory (DFT) calculations revealed that La doping reduced the formation energy of Ovs within the CeO 2 lattice. Moreover, the incorporation of HZSM-5 further decreased this energy barrier while also provided abundant acidic sites. The synergistic interaction between these components enhanced the electronic environment and dispersion of active sites, thereby significantly promoting C Cl bond cleavage and deep oxidation of dichloromethane (DCM). Experimental results demonstrated that the catalyst achieved 81.8% DCM conversion at 450 °C, with over 99% CO 2 selectivity and minimal Cl 2 byproduct formation. This work offers new insights into the value-added utilization of REPPWs and the efficient degradation of chlorinated volatile organic compounds (CVOCs). Download: Download high-res image (227KB) Download: Download full-size image
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FUEL PROCESSING TECHNOLOGY
·
2026
·
IF 7.8
Yongjun Zhang,Xiaodan Zhang,Yulong Zhao,Jiayu Zhang,Hongjing Han,Enhao Sun,Yanan Zhang,Yanguang Chen,Chunming Xu
La/P/HZSM-5 with multi-level pore structure was synthesized via a stepwise dual-template strategy. • The La/P/HZSM-5 zeolite reduces Brønsted acidity and creates Lewis acidity. • The optimal acidity of La/P/HZSM-5 promotes radical and monomolecular cracking. The enhancement of ethylene yield via catalytic cracking presents a persistent challenge in addressing ethylene supply shortages. A series of bifunctional catalysts (La/P/HZSM-5) were prepared via simultaneous incorporation of lanthanum and phosphorus into HZSM-5 zeolite. The Py-IR analyses revealed that the simultaneous introduction of lanthanum and phosphorus resulted in a decrease in the Brønsted acid content of the La/P/HZSM-5 catalyst from the HZSM-5 (0.792 mmol/g) to 0.223 mmol/g. Further analysis of the structure-activity relationship between the catalyst and its performance reveals that the low Brønsted acid and porous structure effectively promotes the monomolecular decomposition of the cracking process. It was evident that the synergistic modification has resulted in the La/P/HZSM-5 catalyst demonstrating superior performance in n -octane cracking, with a cracking mechanism ratio (CMR) of 49.35. The balanced metal-acid functionality of the La/P/HZSM-5 catalyst was found to result in C 2 H 4 yields of 31.23% from n -octane and 19.18% from diesel, representing increases of 31.11% and 50.20%, respectively, compared to the parent HZSM-5 (23.82% and 12.77%). The present work provided a theoretical foundation for the design of metal-acid bifunctional catalysts, with a view to improving ethylene production in catalytic cracking processes. Download: Download high-res image (260KB) Download: Download full-size image
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MEDICINE
·
2026
·Vol. 105
·期 34
·e50278
·
IF 2
Qiuyu Zhu,Juan Wang,Fangqiong Li,Ji Shen,Xiaoting Gong,Bo Yang,Xufen Xia,Yuexing Tu
Rationale: Carbapenem-resistant gram-negative bacterial infections remain a challenge. Colistin is an important treatment option but exhibits substantial pharmacokinetic variability and nephrotoxicity, particularly in critically ill patients with altered renal function. Patient concerns: Five critically ill patients (aged from 25 to 94) with infections in the setting of heterogeneous underlying conditions, including hematologic malignancy, acute respiratory failure, severe trauma, chronic obstructive pulmonary disease, and acute cerebral infarction. Their renal function varied markedly, ranging from augmented renal clearance to severe renal impairment. Diagnoses: Carbapenem-resistant Klebsiella pneumoniae , carbapenem-resistant Acinetobacter baumannii , or both were identified during hospitalization. The patients exhibited different renal function profiles. Acute kidney injury was observed in cases 2 to 5, and cases 3 to 5 required continuous renal replacement therapy. Interventions: All patients received intravenous colistin sulfomethate sodium, with plasma colistin concentrations quantified by liquid chromatography–triple quadrupole mass spectrometry; dosing was adjusted according to clinical course and renal function. Outcomes: Colistin plasma concentrations varied considerably among patients and were not simply inversely related to renal function. All patients achieved the ratio of the unbound area under the concentration–time curve to the minimum inhibitory concentration target for systemic infection, and 3 additionally achieved the higher target for pulmonary infection; however, a favorable clinical outcome was observed in only 2 of the 5 cases. Lessons: Colistin exposure cannot be predicted only from renal function; therapeutic drug monitoring may assist in individualized colistin sulfomethate sodium dosing, particularly in patients with augmented renal clearance or markedly altered renal function. Moreover, the target of unbound area under the concentration–time curve to the minimum inhibitory concentration attainment does not necessarily translate into clinical success, indicating that clinical efficacy is also influenced by disease severity and patient-specific factors.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124471
·
IF 7.5
Sijun Chen,Yang Liu,Jingrong Liu,Tingwei Zhang,Yongcan Jin,Huining Xiao
Sulfonated carbon materials are promising heterogeneous Brønsted acid catalysts for biomass valorization, but the facile construction of carbon frameworks with accessible acid sites remains challenging. Herein, a sulfonated fructose-based porous nanosheet carbon (SPC) was synthesized via a facile and energy-efficient two-step strategy involving P 2 O 5 -assisted rapid self-propagating carbonization and concentrated sulfuric acid sulfonation, and subsequently employed for fructose dehydration to HMF in a low-boiling 1,4-dioxane/H 2 O solvent system. During carbonization, P 2 O 5 simultaneously promoted fructose carbonization and directed the formation of a porous nanosheet architecture, avoiding conventional high-temperature activation processes. The resulting porous nanosheets provided abundant sites for -SO 3 H grafting and enhanced Brønsted acid site accessibility. Consequently, SPC exhibited efficient catalytic performance for the selective dehydration of fructose, affording an HMF yield of 70.1% at 140 ℃ for 30 min. Moreover, SPC efficiently converted concentrated fructose (1.0 g fructose) to HMF with a 59.4% yield and exhibited moderate recyclability. This work provides a facile strategy for constructing biomass-derived sulfonated carbon solid acids with effectively utilized Brønsted acid sites for biomass upgrading.
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INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Siyu Zhou,Wanni Liu,Dongqi Liu,Xian Shi,Kai Huang,Feng Jiang,Hui Gao,Haian Xia,Ying Guan,Siquan Xu
Efficient catalytic conversion of cellulose into 5-hydroxymethylfurfural (HMF) remains challenging and arouses concern. In this study, iron phosphate (FePO 4 ) was embedded into the SBA-15 mesoporous silica matrix as an available active phase via ultrasound-assisted implantation, and then the abundant silanol nests were utilized to graft sulfonic acid groups to construct an innovative FeP@SBA-15-S catalyst. Through a systematic analysis of the characteristics of crystal, texture, element valence, acidity, hydrophilicity, etc., it was reflected that FeP@SBA-15-S catalyst gave the active FePO 4 component porosity and exhibited bifunctional acidity. Without pretreatment and other acid additives, FeP@SBA-15-S catalyzed cellulose under optimal conditions provided a desired HMF yield of 52 %. More meaningfully, the cellulose and hemicellulose components in native wheat straw could be catalyzed simultaneously by FeP@SBA-15-S catalyst, yielding 61 % HMF and 60 % furfural in one-pot. The cyclability evaluation showed that the FeP@SBA-15-S catalyst still had considerable activity after six continuous runs, with a slight loss in activity attributed to the leaching of active components and pore coverage. A clear catalytic pathway was summarized by GC-MS and 13 C NMR spectrum as cellulose undergoing glucose monomer ring opening, isomerization to fructose, fructose ring closure and final dehydration, and the by-products were also detected as mainly C 3 -C 23 fragments and oligomers.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Shihong Zhang,Dongyan Li,Jie Huang,Wenjie Liu,Guoxing Jing,Wen Liu,Jianna Yu,Tiejun Song,Wenshan Li
Lead ion (Pb 2+ ) is a highly toxic heavy metal with strong bioaccumulation potential, posing serious risks to environmental and food safety. In this work, we developed a dual-trigger enhanced catalytic hairpin assembly (CHA) strategy for rapid and sensitive colorimetric detection of Pb 2+ using a GR–5 DNAzyme-mediated cascade reaction. A dumbbell-shaped hairpin probe was designed to form a dimeric complex through complementary palindrome sequences of H1, with its loop region containing a ribonucleotide adenosine (rA) site. In the presence of Pb 2+ , the GR–5 DNAzyme catalyzed cleavage at the rA site, generating a new dimeric complex that efficiently initiated the CHA reaction. This dual-trigger design significantly accelerated the CHA process through the localized high-concentration trigger sequence. Consequently, an intact G-quadruplex sequence was exposed, which produced a distinct colorimetric signal. The biosensor enables accurate quantification of Pb 2+ over the linear range of 0.5–100 nM, with a detection limit as low as 51.25 pM. Spiked recovery rates in drinking water and fish samples range from 96.61 % to 109.77 %, demonstrating the biosensor's accuracy and practical applicability. These results highlight the potential of this biosensor for real-time monitoring of Pb 2+ contamination in environmental and food samples, contributing to improved public health and safety.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.9
Yongxin Liang,Jinlong Liang,Wenhong Lei,Huamin He,Zuqiang Huang,Huayu Hu,Tao Gan,Yanjuan Zhang
Photocatalytic oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) represents a promising pathway for the valorization of biomass. However, this process still encounters challenges including low conversion efficiency and limited selectivity. To address these issues, a MnO 2 /potassium-doped carbon nitride (MnO 2 /K-CN) heterojunction photocatalyst, featuring abundant oxygen vacancies and intercalation structure, was synthesized for highly efficient and selective photocatalytic oxidation of HMF to DFF. Characterizations reveal that MnO 2 /K-CN with a large specific surface area facilitates the exposure of active sites and the mass transfer of reactants. Concurrently, the S-scheme heterojunction not only broadened the visible-light absorption range but also increased the density of oxygen vacancies in MnO 2 , effectively promoting the separation of photogenerated electron‒hole pairs. MnO 2 /K-CN induced the selective generation of superoxide radicals (•O 2 − ) and singlet oxygen ( 1 O 2 ) while suppressing the formation of hydroxyl radical (•OH), achieving high selectivity toward DFF. MnO 2 /K-CN achieved a HMF conversion of 98.6% and a DFF yield of 94.4%, while maintaining excellent catalytic stability. Theoretical calculations further reveal that MnO 2 /K-CN significantly reduced the energy barrier for the oxidation reaction of HMF, accelerating the oxidation kinetics. This study provides new insights for developing highly efficient and stable photocatalytic systems to achieve high-value-added utilization of biomass resources.
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DYES AND PIGMENTS
·
2014
·
IF 3.468
Kun Zhou,Chao Qin,Li-Kai Yan,Wen-E Li,Xin-Long Wang,Hai-Ning Wang,Kui-Zhan Shao,Zhong-Min Su
Three silver(Ι) alkynyl compounds, [Ag 5 (C C t Bu)(CF 3 COO) 7 ( n Bu 4 N) 3 ·H 2 O] ( 1 ), [Ag 8 (C C t Bu) 2 (CF 3 COO) 10 (Et 3 N) 4 ] ( 2 ), and [Ag 12 (C C t Bu) 6 (CF 3 COO) 8 ( n Bu 4 N) 2 (Et 3 N) 2 (CF 3 COO) 2 ] ( 3 ), have been obtained. Concomitantly, isolated [Ag 5 (C C t Bu)(CF 3 COO) 7 ] 3– , [Ag 8 (C C t Bu) 2 (CF 3 COO) 10 ] 4– and [Ag 12 (C C t Bu) 6 (CF 3 COO) 8 ] 2– clusters ( Ag 5 , Ag 8 and Ag 12 for short) appear in 1 – 3 , respectively. The synthesis of 1 – 3 demonstrates silver(I) alkynyls are better systems for the study of the template effect. ESI-MS analysis indicates compounds 1 – 3 can stably exist in methanol, and they have been proved to be potential wide gap semiconductor materials by the reflectance spectra. Notably, the second hyperpolarizabilities ( γ values) of Ag 5 , Ag 8 and Ag 12 have been studied by using time-dependent density functional theory (TDDFT) calculations and the finite filed (FF) approach combining CAM-B3LYP. The calculated results show that they can be applied as potential third-order nonlinear optical (NLO) materials owing to their second hyperpolarizabilities rising from 39.1 × 10 −36 , 60.3 × 10 −36 to 97.7 × 10 −36 esu with the growth of the number of Ag atoms and C C groups.
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FUEL
·
2026
·
IF 7.5
Yuejin Zhan,Bi Luo,Jiaying Chen,Vasilevich Sergey Vladimirovich,Bilainu Oboirien,Qingang Xiong,Yefeng Zhou
During plastic catalytic pyrolysis, HZSM-5 faces challenges such as limited mass transfer and low active site utilization, resulting in poor aromatization and anti-deactivation performance. To address these challenges, a hollow HZSM-5 catalyst with a hierarchical micro- meso -macroporous structure was designed in this work. The structure–activity relationship of hollow HZSM-5 was then systematically explored, focusing on the influence of pore structure and acidic sites on catalytic performance. The hollow HZSM-5 catalyst without metal loading exhibited outstanding catalytic performance in the catalytic pyrolysis of plastics, with high selectivity of 95.79% for aromatic hydrocarbons (AHs) and 83.08% for monocyclic aromatic hydrocarbons (MAHs). More importantly, hollow HZSM-5 delivered outstanding stability with an initial performance retention of 95.75% after five cycles and achieved selectivity of AHs exceeding 86% for various polyolefin plastics. The excellent catalytic performance was attributed to the synergistic optimization of pore structure and acidic sites. On the one hand, the hierarchical porous structure significantly enhanced mass transfer, thereby improving the anti-deactivation performance and active site utilization of the catalyst. On the other hand, acidity enhanced by desilication efficiently promoted the aromatization of plastics. This work highlighted the importance of rational catalyst design in achieving efficient and stable catalytic pyrolysis of plastics toward valuable chemical products.
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Food Chemistry-X
·
2026
·
IF 9.2
Wenxin Chen,Jiahao Fu,Yaqi Liu,Yao Fan,Haiyan Fu,Yuanbin She
Ochratoxin B (OTB) that widely presented in food has significant cytotoxicity even at low concentration levels. Herein, a novel fluorescent sensor based on the 2-mercapto-5-benzimidazole carboxylic acid (MBI)-capped CdSe quantum dots (QDs) was established for the selective detection of OTB in food. Specifically, the synergistic effect of electrostatic interaction and intermolecular hydrogen bonds between MBI and OTB provided a direct and sensitive fluorescence signal that enables efficient recognition of OTB from other mycotoxins, even OTA with similar structures. Excellent linear detection performance for OTB is exhibited with a range from 0.037 ng/mL to 48.01 ng/mL and a detection limit of 0.016 ng/mL. Furthermore, our developed method exhibits good anti-interference stability against contaminants such as mycotoxins, inorganic salts and amino acids. Most importantly, the sensor demonstrates high sensitivity in real food samples with the recovery ranges from 96.51% to 104.7%, with an RSD of less than 2.67%.
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Food Analytical Methods
·
2026
·Vol. 19
·期 4
·138
·
IF 3
Wang Hui,Wang Zhaoxia,Qin Jijun,Zhong Feifei,Kong Xiangling,Chen Meimei,Han Shilei,Zhang Lei,Yuan Yuan,Yin Fangping,Zhou Peng
This study developed a comprehensive strategy to identify and quantify a novel vardenafil analogue, SLX-2101, which was detected as an undeclared adulterant in functional foods. The compound was initially screened and characterized using ultra-performance liquid chromatography–quadrupole time-of-flight mass spectrometry (UHPLC-UV-Q-TOF/MS), and its structure was confirmed via nuclear magnetic resonance (NMR) spectroscopy and comparison with a custom-synthesized reference standard. A quantitative ultra-performance liquid chromatography–tandem mass spectrometry (UHPLC-QqQ/MS) method was established and validated, demonstrating good linearity (1.0–100.0 μg/L, r > 0.997), with a limit of detection of 0.3 μg/kg and a limit of quantification of 1.0 μg/kg. Mean recoveries ranged from 74.2% to 115.8% across various food matrices, with relative standard deviations between 0.4% and 12.5%. Application to 61 commercial samples revealed SLX-2101 in two functional wines marketed for their purported aphrodisiac effects at concentrations of 19.3 mg/kg and 1.3 × 10 3 mg/kg. The validated method enables reliable surveillance of this emerging adulterant, thereby providing a practical solution to address the critical gap left by conventional targeted screening protocols.
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危险品化学品经营许可证（带存储）