LWT-FOOD SCIENCE AND TECHNOLOGY
·
2020
·
IF 4.006
Tao Meng,Xiao Zhipeng,Huang Ai,Chen Jiayu,Yin Tianji,Liu Zhengquan
Keemun congou black tea (KCBT), a kind of tea suitable for storage, its aroma changes considerably during storage. In this study, seven same grade KCBTs, that had been stored for 1–20 years, were analyzed, solvent extraction-solid phase extraction-gas chromatography-mass spectrometry (SE-SPE-GC-MS) was used to analyze volatiles changes. The effect of storage on volatiles was strong, dozens of volatiles varied and had potential to be indicators of storage. In the first category of volatiles, the concentrations fluctuated and then decreased, a clear line of demarcation mostly existed between the 5th and 10th years. In the second category, the concentrations exponentially decreased with a high coefficient of determination (R 2 ) during the entire storage, most of these volatiles were crucial glycoside-derived volatiles, including geraniol, linalool, etc. In the third category, the concentrations increased and then decreased, most of these volatiles were products of the autoxidation of lipids and carotenoids—with hexanoic acid and dihydroactinidiolide being representative examples, respectively. These volatiles were outstanding storage markers for the first 5 years of storage. In the final category, the concentrations continually increased, methoxy benzenes volatiles including 1,2,3-trimethoxybenzene, 1,2,4-trimethoxybenzene etc., were representative and favorable indicators of KCBT being stored for more than 5 years.
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DOI
高影响因子
Journal of Cleaner Production
·
2025
·
IF 10
Tao Jiang,Ming Cheng,Yujiao Wang,Shaoqiang Guo,Wentao Zhou,Yafei Wang
The selective removal of neutron-absorbing fission products from spent nuclear fuel is critical for enhancing neutron economy and enabling efficient recycling. In this work, we present a novel two-step dry reprocessing strategy that integrates NH 3 /HCl gas mixture treatment with liquid Sn extraction to achieve phase-selective separation of Sm, Nd, Ru, Rh, and Pd from simulated U 3 O 8 -based spent fuel. Thermodynamic analysis and experimental validation reveal that decomposition of NH 4 Cl at elevated temperatures serves as the generator of NH 3 /HCl gas mixture capable of selectively chlorinating Sm 2 O 3 and Nd 2 O 3 into soluble chlorides while reducing U 3 O 8 to UO 2 and converting RuO 2 , Rh 2 O 3 , and PdO to their metallic states (Ru, Rh, Pd). Subsequent dissolution tests in LiCl-KCl confirm that Sm and Nd are almost completely removed, with chlorination efficiencies of nearly 100%, while uranium loss can be minimized by controlling direct NH 4 Cl contact. The coupled liquid Sn extraction at 1173 K enabled the recoveries of metallic Rh, Rh, and Pd with a promising extraction efficiency. This integrated approach significantly simplifies the partitioning of key neutron poisons (Sm, Nd, Ru, Rh, Pd) compared to conventional aqueous or pyrochemical routes, reduces secondary waste, and preserves uranium in its UO 2 form.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yuchen Li,Zhen Chen,Guoxiong Zhan,Bingling Yuan,Lidong Wang,Junhua Li
Catalytic amine-based solvent regeneration with solid acid is a feasible option for reducing energy consumption of CO 2 capture, but facing crucial challenges on designing material structures and understanding reaction mechanisms. Herein, we cover the nanoscale NiFe 2 O 4 cluster with covalent organic frameworks (COFs), to prepare solid acid catalysts. The pristine chemical bonds of Ni(Fe)-O and Ni(Fe)-Ni(Fe) are substituted by Ni(Fe)-N and Ni(Fe)-N-Ni(Fe) by targeting the anchoring of NiFe 2 O 4 cluster over COFs. The created coordination state stimulates the production of Brønsted acid sites. The obtained nanomaterials achieve a considerable improvement in CO 2 desorption of up to 290.1 mmol/(min·g) at 88 °C for spent monoethanolamine (MEA) solvent, representing a substantial increase of 540% relative to traditional thermal desorption. Consequently, the energy consumption of MEA generation is reduced by approximately 58%. Intermediate species (HCO 3− , CO 3 2− , and RNHCOO − ) and reaction pathways are established by combining operando Raman spectroscopy and ex situ 13 C NMR spectrum measurements. Theoretical calculations are performed to clarify the transformation mechanism of the acid sites around Ni/Fe atoms and its intrinsic role in the adsorption equilibrium of solvent regeneration.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2021
·Vol. 44
·期 12
·2474-2482
·
IF 3.645
Liancheng Gu,Fangling Wu,Shutong Yang,Fuxing Xu,Xinhua Dai,You Jiang,Xiang Fang,Shaoning Yu,Chuan-Fan Ding
Enantiomeric drugs are widely used and play important roles in pharmaceuticals. Ion mobility spectrometry coupled with mass spectrometry technology provides a unique method for distinguishing the enantiomeric drugs, enantiomeric identification, and quantitation in the gas phase. In this study, enantiomeric molecules of ibuprofen and flurbiprofen were clearly recognized by forming host–guest complex ions using trapped ion mobility time-of-flight mass spectrometry. Ternary complex ions can be produced easily by electrospray ionization of the mixed solutions of ibuprofen, cyclodextrins, and CaCl 2 , LiCl, or NaCl, as well as flurbiprofen, cyclodextrins, and CaCl 2 . The relative contents of different chiral ibuprofens in a mixed solution were also quantitatively measured. This new method is a simple, effective, and a convenient enantioselective analysis method.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Shanshan Shao,Tianrui Sun,Xiaohua Li,Yifan Wang,Laixin Ma,Zhufeng Liu,Shiliang Wu
Due to the high molecular weight, high viscosity and strong instability of heavy bio-oil from rape straw, it is necessary to explore new high-value utilization methods. Heavy bio-oil based carbon material (HBC) was prepared via carbonization and activation assisted by pyrolysis gas, and the basic Mg-Zr-O catalysts using HBC as the carrier (Mg-Zr-O/HBC) was synthesized for the aldol condensation of cyclopentanone to produce aviation fuel precursor. The effect of activation condition on the physicochemical properties of HBC and Mg-Zr-O/HBC were evaluated, the evolution of gas component before and after activation was explored, and the catalytic performance of Mg-Zr-O/HBC in the aldol condensation of cyclopentanone for the synthesis of aviation fuel was tested. Instead of traditional KOH activation, pyrolysis gas activation was beneficial for the reduced pollution and increased calorific value of the gas, making it an environmentally friendly method. The results showed that the activation of biochar (BOC) was improved with lower pyrolysis gas flow , higher activation temperature and longer activation time. The pore structure of carbon material was significantly improved, and the specific surface area was boosted from 15.25 m 2 /g 3 to 627.61 m 2 /g 3 . Mg-Zr-O was evenly distributed on HBC, and a large number of weak and medium basic sites were found in Mg-Zr-O/HBC, which was quite favorable for the aldol condensation. In the aldol condensation of cyclopentanone, Mg-Zr-O/HBC presented the excellent production of the targeted C10+C15 condensates of 84.95 %, which was comparable to that prepared with KOH as activator. After 8 repeated runs, the yield of the targeted condensates remained at 73.33 %. In general, it provided an environmentally friendly strategy for the preparation of HBC and the high-value utilization of pyrolysis gas assisted by pyrolysis gas for the activation of BOC.
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高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Tiantian Xu,Shijie Xing,Jinyu Wang,Xin Zhang,Shu-Xuan Liang
It is crucial to select highly efficient adsorbents to separate and enrich trace analytes during sample pretreatment process. In this study, NiFe 2 O 4 pyridyl-based microporous organic network (NiFe 2 O 4 /PMON) was prepared using a fast and simple ultrasonic assisted method, which could be completed within 2 h. A magnetic solid phase extraction method based on 3 mg NiFe 2 O 4 /PMON as an extraction adsorbent was developed. Combining with GC–MS, an effective method for simultaneous detection of 10 triazine herbicides was established. The proposed method showed high sensitivity (LODs range of 0.19–0.46 ng/L), good precision (RSD below 8.3 %), and strong reliability, with spiked recovery rates between 70.5 and 108.4 %. NiFe 2 O 4 /PMON exhibited strong affinity for triazine herbicides through π–π, hydrophobic and hydrogen bond interactions. This study provides new ideas for the composite method of magnetic nanoparticles with MON. In addition, by extending the combination of MON and magnetic oxides, it can be used for the efficient detection of pesticide residues in water.
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高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2026
·
IF 2
Kwang I. L. Wi,Ri Myong Kim,Tae Hun Ryo,Song Chol Ri,Yong-Hwan Han,Su Jin Ju
Monochloroacetic acid (MCA) is a pivotal intermediate in agrochemicals and pharmaceuticals, but its industrial synthesis via acetic acid chlorination faces challenges related to selectivity and reaction time. This study investigates the kinetics of gas–liquid heterogeneous acetic acid chlorination using elemental sulfur as a catalyst precursor to establish a scientific basis for process optimization. A consecutive-parallel reaction mechanism was proposed incorporating acetic acid consumption, acetyl chloride conversion, MCA formation, and dichloroacetic acid (DCA) formation. Kinetic parameters were determined at 353, 363, 373, and 383 K in a steel bubble column reactor with fixed initial sulfur concentration (1.92 mol/L) and Cl 2 space velocity (4.028 L L −1 h −1 ). The activation energy for DCA formation (87.55 kJ mol −1 ) was substantially higher than that for MCA accumulation (52.40 kJ mol −1 ). Relative rate analysis revealed that k 3 / k 4 decreases continuously from 1.83 at 353 K to 0.76 at 383 K, confirming that lower temperatures favor MCA selectivity. The proposed kinetic model showed excellent agreement with experimental data ( R 2 > 0.98). Based on the kinetic analysis, three optimization strategies were derived: maintaining high acetic acid concentration, dynamic adjustment of Cl 2 feed rate, and implementation of a decreasing temperature–time profile. This work provides a scientific basis for optimizing industrial MCA synthesis using low-cost sulfur as a catalyst precursor.
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高影响因子
FOOD CONTROL
·
2026
·
IF 7
Xifan Zhan,Shanghua Li,Xuan Hu,Qinuo Wang,Md Mehedi Hassan,Yuan Zhang,Xue Zhang,Jingjing Wang,Zhen Wang,Qingmin Chen,Yi Xu,Quansheng Chen
Shrimp quality deteriorates during storage, making the assessment of freshness vital in the food industry. In this study, a spoilage gas-responsive chip was fabricated to integrate hyperspectral imaging and Raman spectroscopy, enabling the construction of a multimodal nondestructive detection model based on a multi-level data fusion strategy. Three different levels of fusion strategies were analyzed and compared, namely raw-data spectrum fusion, refined-feature spectrum fusion, and cross-model decision fusion. The results demonstrated that the cross-model decision fusion strategy employing adaptive Bayesian weighting for decision-making achieved excellent performance, with Rp 2 , RMSEP, and RPD values of 0.9911, 0.9056, and 10.3730, respectively. In subsequent external validation, the Rv 2 and RMSEV were 0.9352 and 2.1479, respectively, demonstrating significant improvement over the single-modal model and the spectrum fusion models. This study offers a promising approach for rapid, nondestructive freshness detection during shrimp storage.
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高影响因子
Catalysts
·
2026
·Vol. 16
·期 5
·417
·
IF 4.5
Ziyan Mi,Huayun Long,Yuhua Jia,Yue Ma,Cuilan Miao,Yan Xie,Xiaomei Zhu,Jiahui Huang
Developing effective catalysts for the epoxidation of propylene with H2and O2holds significant scientific and industrial significance. This study synthesized a series of Au/TS-1 catalysts modified with alkali metals (Na+, Cs+) and carefully examined their impact on gas-phase propylene epoxidation, with particular attention to the role of anions. The optimal Au–CsC(1:10)/TS-1 catalyst (Cs2CO3modified, Au/Cs molar ratio = 1:10) achieves a propylene conversion of 16.8%, a PO selectivity of 88.5%, an H2efficiency of 40.8%, a record PO formation rate of 383.9 gpo·kgcat−1·h−1, and unprecedented long term stability (>380 h without deactivation). To the best of our knowledge, no previous study has simultaneously achieved such balanced and outstanding performance across all these key indicators. Comprehensive characterization reveals that Cs+modification suppresses side reactions and coke formation, increases microporosity, tunes surface acid–base properties and hydrophobicity, restricts Au particle size, and stabilizes both Au0and tetra coordinated Ti sites, thereby inhibiting H2O2decomposition and PO isomerization while greatly enhancing reaction efficiency. This holistic advancement represents a significant leap forward for Au based catalysts in gas phase propylene epoxidation, offering both a theoretical foundation and practical guidance for the development of high performance epoxidation catalysts.
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高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yanmei Cui,Yerong Huang,Jie Mi,Jiancheng Wang,Mengmeng Wu
It is unclear about H 2 O-induced effects on H 2 S-absoprion/COS-release behavior during high-temperature coal gas cleaning with Zn-based sorbents. This work aims at clarifying the aforementioned effect. The results reveal that the presence of 5–10 vol% H 2 O reduces the sulfur capacity of sorbents by 41–55%, while also decreasing the amount of released COS before H 2 S-breakthrough ( A-COS BT ) by 97%–99%. For wet coal gas desulfurization, the CO-H 2 S reaction accounts for nearly all of the COS released, while the contribution from the CO 2 -H 2 S reaction is negligible. Both Ni- and Ce-doping decrease A-COS BT of sorbents by 85%–89% and 92%–94%, respectively. Moreover, Ni-doping enhances the H 2 S-uptake capacity of sorbents by 32%–103%, which is mainly ascribed to the weakening of Zn-O bond. The performance of the Ni-Ce co-doped desulfurizer lies between those of the sorbents doped solely with Ni and Ce, respectively. Furthermore, co-doped sorbents could maintain 82%–92% of initial sulfur capacity and strong ability of inhibiting COS-formation during multiple sulfidation-regeneration cycles. It provides new insights for H 2 O-induced effects on H 2 S-absorption/COS-release behavior during hot coal gas cleaning.
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高影响因子
MOLECULES
·
2026
·Vol. 31
·期 4
·594
·
IF 5.1
Bing Qian,Xuan Zhu,Chulian Su,Hongxing Li,Qiong Wu,Chengyuan Liu,Yang Pan,Bingjun Han
Thermal oxidation of edible oils during high-temperature cooking produces complex fumes containing harmful volatile compounds. However, the role of water, a common co-reactant in practical cooking, remains insufficiently understood. In this study, oleic acid was used as a model compound to investigate thermal oxidation. Online monitoring using synchrotron radiation photoionization mass spectrometry (SR-PIMS) revealed that water significantly increased the emission of volatile acetaldehyde and acrolein, with maximum increases of 164% and 123% at 10% water addition. Complementary offline GC-MS analysis showed enhanced formation of (E)-2-decenal, (E,E)-2,4-decadienal, and (E)-2-undecenal, suggesting these unsaturated aldehydes may be key intermediates. Mechanistically, oleic acid underwent free radical-mediated peroxidation to form (E)-2-decenal, (E)-2-undecenal, and (E,E)-2,4-decadienal. These intermediates subsequently decomposed into acetaldehyde and acrolein via hydration, retro-aldol condensation, and hydroperoxide scission, with water accelerating both processes. Overall, these findings highlight water’s critical role in promoting the generation of harmful volatile aldehydes in oil fumes.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·123223
·
IF 7.5
Gaoshan Xing,Chen Yang,Xinrui Li,Silan Li,Wanxiong Xiao,Wen Wang,Liqiang Qi
Developing high-activity and low-cost desulfurizers is crucial for treating the steel industry low-temperature and highly volatile low-sulfur flue gas. This study proposes a simple and effective additive engineering strategy to convert traditional quicklime into Ca(OH) 2 desulfurizer with high activity via synergistic modification with triethanolamine (TEA), diethylene glycol (DEG), and sodium silicate (Na 2 SiO 3 ). The optimized Ca@TDS has a highly porous microstructure, characterized by a specific surface area as high as 42.19 m 2 /g, and pore volume reaching 0.186 cm 3 /g. It exhibited an elevated sulfur capacity at 37.97 mg/g, with breakthrough time extended to 93.8 min at 100°C, and excellent adaptability under high SO 2 concentrations and CO 2 -containing atmospheres. Comprehensive characterization and kinetic models indicated that the synergistic effect of additives enhanced pore connectivity, promoted internal diffusion, and suppressed surface carbonate deposition. This study also successfully employed 10 tons of industrial products Ind-Ca@TDS to control SO 2 emissions below the ultra-low standard of 35 mg/m 3 in the steel plant pilot test, which fully verified the scalability and industrial feasibility of the method. This work provided an expandable and cost-effective way for the production of high specific surface Ca(OH) 2 , providing practical reference for the development of dry low-temperature FGD technology in the steel industry.
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高影响因子
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