Molecular Catalysis
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2026
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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
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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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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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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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FUEL PROCESSING TECHNOLOGY
·
2026
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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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Molecular Catalysis
·
2026
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IF 4.3
Tianyi Long,Shulin Cao,Youhua Wang,Fangyuan Zhou,Hongke Zhang,Wanbin Zhu,Hongliang Wang
Derivatization of cellulose remarkably enhances its conversion reactivity. • Cellulose acetate delivers 9.4-fold higher HMF yield than pristine cellulose. • Glycosidic-bond hydrolysis is the rate-limiting step in cellulose conversion. • Structure-reactivity insights enable efficient valorization of cellulose waste to HMF. Native cellulose’s recalcitrant hydrogen-bond network severely limits its efficient conversion to 5-hydroxymethylfurfural, a versatile biobased platform chemical. Chemical modification can disrupt cellulose crystallinity and boost reactivity, but systematic comparisons between esterification and etherification modifications, and the influence of grafted carbon chain length, remain largely unaddressed. This work investigates seven industrially relevant modified celluloses in an AlCl 3 /γ-valerolactone/water biphasic system, integrating reaction screening, structural characterization, density functional theory calculations and kinetic analysis. Cellulose acetate with the shortest acetyl side chain achieves the highest HMF yield of 49.3 mol% at 150 °C, 9.4 times that of native α-cellulose. Kinetic modeling identifies glycosidic bond hydrolysis as the rate-limiting step, with an apparent activation energy of only 46.0 kJ/mol, far below typical values for native cellulose systems. These findings clarify the structure-reactivity relationship and offer a pathway for valorizing modified cellulose wastes. Download: Download high-res image (380KB) Download: Download full-size image
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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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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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Materials Today Chemistry
·
2022
·
IF 7.613
D. Meng,Y. Li,P. Qi,J. Sun,X. Gu,H. Li,Z. Wang,S. Zhang
The fire hazard posed by the inherent flammability and smoke toxicity of flexible polyurethane foam (FPUF) often necessitates the incorporation of flame retardants to meet stringent regulations. The development of environmentally friendly strategies to enhance the fire resistance of FPUF is of increasing importance and a significant amount of research has been devoted to this end. In this work, a bio-based coating was constructed by co-depositing polydopamine and guanosine 5′-monophosphate disodium salt (GMP) to increase the fire safety of FPUF. The coating significantly improved the flame retardancy of FPUF. The FPUF@PDA-GMP samples showed an LOI value of 24.5% with a self-extinguishing effect and exhibited reduced release of heat, smoke, CO, CO 2 , and HCN due to their compact and strong char. The compressive strength at 70% strain of FPUF@PDA-GMP was 8 times higher than that of the control FPUF sample. The coating had a little negative effect on the resilience and improved its elongation at break. This investigation has provided a useful method for designing and producing high-performance foams.
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Yu Yin,Chunhui Ma,Wei Li,Sha Luo,Zhanshuo Zhang,Shouxin Liu
Facilitated isomerization of cellulose hydrolysis intermediate glucose without unexpected byproducts, which is the rate-determining step in the production of high-value-added biofuels, enables the efficient production of 5-hydroxymethylfurfural (5-HMF) from cellulose. In this work, considering the essential role of the acidity control and shape selectivity of a zeolite catalyst, a NiO-loaded mesoporous NiO/poly(vinyl pyrrolidone) (PVP)-phosphotungstic acid (HPA)@SBA-15 nanoreactor was prepared. This SBA-15 nanoreactor with a pore size of 5.47 nm reduced the concentration of byproducts formic acid (FA) and levulinic acid (LA) through shape selection for intermediates. Well-defined NiO nanoparticles (Ni-to-carrier mass ratio was 1:1) provided the NiO/PVP-HPA@SBA-15 nanoreactor a high Lewis acidity of 99.29 μmol g–1 for glucose catalytic isomerization, resulting in an increase in total reducing sugar (TRS) yield by 5 times. Such a nanoreactor remarkably improved the reaction efficiency of 5-HMF production from cellulose (a 5-HMF selectivity of 95.81%) in the 1-butyl-3-methylimidazolium chloride ([BMIM]Cl)/valerolactone (GVL) biphasic system.
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ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Jun Xiong,Ke-Ke Chen,Neng-Bin Xie,Tong-Tong Ji,Si-Yu Yu,Feng Tang,Conghua Xie,Yu-Qi Feng,Bi-Feng Yuan
DNA methylation (5-methylcytosine, 5mC) is the most prevalent epigenetic modification that is predominantly found in CG dinucleotides in mammalian genomes. In-depth investigation of the functions of 5mC heavily relies on the quantitative measurement of 5mC at single-base resolution in genomes. Here, we proposed a methyltransferase-directed labeling with APOBEC3A (A3A) deamination sequencing (MLAD-seq) method for the single-base resolution and quantitative detection of 5mC in DNA. In MLAD-seq, a mutant of DNA methyltransferase, M.MpeI-N374K, is utilized to selectively transfer a carboxymethyl group to the 5 position of cytosine in the CG dinucleotide to form 5-carboxymethylcytosine (5camC) using carboxy-S-adenosyl-l-methionine (caSAM) as the cofactor. After A3A treatment, 5camC is resistant to the deamination and base pairs with guanine. Thus, the cytosines in CG sites are read as C in sequencing. On the contrary, the methyl group in 5mC inhibits its carboxymethylcytosine by M.MpeI-N374K and therefore is readily deaminated by A3A to produce thymine that pairs with adenine and is read as T in sequencing. The differential readouts from C and 5mC in the MLAD-seq enable the single-base resolution mapping of 5mC in CG sites in DNA. With the developed MLAD-seq method, we observed the hypermethylation in the promoter region of retinoic acid receptor β (RARB) gene from human nonsmall cell lung tumor tissue. Compared to harsh reaction conditions in bisulfite sequencing that could lead to significant degradation of DNA, the whole procedure of MLAD-seq is carried out under mild conditions, which will avoid DNA damage. Thus, MLAD-seq is more suitable in the scenario where only limited input DNA is available. Taken together, the MLAD-seq offers a valuable tool for bisulfite-free, single-base resolution and quantitative detection of 5mC in limited DNA.
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