MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Li Li,Run Chen,Tianliang Hu,Yifan Li,Qiang Wang,Chiyang He
A magnetic pillar[5]arene polymer (M-P5A-P) was prepared for removal of organic pollutants in water and air. M-P5A-P was synthesized by grafting pillar[5]arene polymer on the surface of the cellulose-closed magnetic microparticles. The obtained M-P5A-P was characterized by FT-IR spectroscopy, transmission electron microscope, X-ray diffraction, magnetic hystersis loop analysis, thermo-gravimetric analysis, and energy dispersive X-ray spectrometer. When used as an adsorbent for four different types of organic pollutants (bisphenol A, 1-naphthylamine, propranolol and methylene blue) in water, M-P5A-P presented much higher adsorption ability than magnetic cellulose and fast binding kinetics with the equilibrium time all less than 10 min. Moreover, M-P5A-P can be rapidly separated from solution by a magnet, and it showed good reusability and reproducibility. M-P5A-P was successfully applied to the simultaneously rapid removal of four pollutants (0.1 μg mL −1 for each one) in mixed solution with removal efficiencies of 82.3–99.4% within 5 min. M-P5A-P can also rapidly capture styrene vapor at environmental concentration to a concentration much lower than the limit of the U.S. Occupational Safety and Health Administration within 5 min. Therefore, M-P5A-P can be potentially used as a good adsorbent for simultaneously removing different type of organic pollutants in water or air.
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INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Yazhen Chen,Hetong Lin,Yanjie Li,Mengshi Lin,Jicheng Chen
Non-enzymatic browning of vinegar soaked-soybean residual solution was investigated using a model solution. A glycine-fructose-gallic acid model system was proposed by analyzing reducing sugars, amino acids, total phenolics, and pH value of the vinegar soaked-soybean residual solution. Based on the proposed model, the kinetics of 5-hydroxymethylfurfural (5-HMF) formation was also studied. The results showed that Maillard reaction and sugar pyrolysis might be the accurate mechanisms of non-enzymatic browning in vinegar soaked-soybean residual solution. The formation of 5-HMF in the model solution exhibited characteristics of the first-order kinetic model at temperature from 60 to 140 °C. The frequency constant k f was 450.65 /h, and the apparent activation energy E a was 20.15 kJ/mol. Acetic acid, Fe 2+ , and Fe 3+ significantly enhanced the browning rate and 5-HMF formation; whereas Ca 2+ , Mg 2+ , Na + , glucose oxidase, and H 2 O 2 inhibited the browning rate.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Juhao Wu,Hong Tian,Fan Gu,Hai Ning,Junjie Huang,Binbin Chen,Yanlin Zeng,Huimin Mao,Xinmiao Wang
Pyrolysis technique can effectively convert waste plastics into high-performance asphalt modifiers, improving the asphalt pavement performance, thus achieving the resourceful utilization of waste plastics as building materials. Selecting Polypropylene (PP) and polystyrene (PS) as raw materials, pyrolysis experiments were conducted to explore their synergistic interaction. Using Thermogravimetric analysis (TGA), tube furnace, and gas chromatography-mass spectrometry (GCMS), the effects of plastics mixing ratio and Ni loading in HZSM-5 on the pyrolysis products and heavy oil composition were investigated. Based on the optimal heavy oil, the high and low temperature performance and aging resistance of the heavy oil modified asphalt were quantitatively evaluated. The results showed that the PP/PS co-pyrolysis exhibited higher conversion efficiency, with a 1:3 ratio maximizing liquid yield at 74.26 %. Ni-modified HZSM-5 effectively boosted the production of aromatic hydrocarbons in heavy oil while inhibiting the generation of phenols, acids, organosilicons and other non-hydrocarbon byproducts. The optimal Ni loading was 10 wt%, which maximized aromatic hydrocarbon content at 81.36 % within 90.6 % polycyclic aromatic hydrocarbons (PAHs), achieving the best modulation of pyrolysis heavy oil components. The addition of heavy oil significantly improved the high-temperature stability and aging resistance of asphalt, though impairing low-temperature cracking resistance. The optimal oil content was 6 wt%, making the softening point increased by 10.3°C. This advancement promoted the conversion of waste plastic heavy oil into high-performance asphalt modifiers to avoid difficult combustion, providing theoretical support and technical guidance for its high-value application in the asphalt pavement field.
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高影响因子
Catalysts
·
2025
·Vol. 15
·期 12
·1120
·
IF 4
Peng Yang,Hualei Hu,Yong Yang,Guojun Lan,Soliman I. El-Hout,Qianquan Fang,Guowen Lu,Chunlin Chen,Jian Zhang
The nano-metal oxide-catalyzed oxidation of 5-hydroxymethylfurfural (HMF) with sodium hypochlorite (NaClO) is an effective and mild technique for synthesizing 2,5-furanediformic acid (FDCA). However, the rapid and large-scale separation of nanocatalysts remains a major challenge. In this study, we developed a magnetic and recyclable copper oxide-based catalyst supported on the mechanochemically synthesized Fe3O4. Benefiting from the introduction of the Fe3O4carrier and cetyltrimethylammonium bromide (CTAB) surfactant, the CuO-CTAB/Fe3O4catalyst owns smaller CuO particle sizes, which endows it with excellent catalytic activity in the oxidation of HMF, achieving a high FDCA yield of 90.3%. Furthermore, the rapid magnetic separation of the catalyst effectively inhibits the excessive conversion of FDCA. The recovered catalyst can be reused for at least five cycles without significant loss of catalytic performance, confirming the promising application prospect of the CuO-CTAB/Fe3O4catalyst.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jingkai Hu,Huaxin Lin,Zhuowei Cheng,Jianmeng Chen,Ruiqi Zhu,Dongzhi Chen,Zhaoyang Lu
Volatile organic compounds (VOCs), particularly toluene, pose significant environmental and health challenges. This study addresses the limitations of ZSM-5 zeolite in humid environments by integrating Si/Al ratio optimization with hydrophobic modification via layered double hydroxide (LDH) coatings. H-ZSM-5 zeolites with Si/Al ratios of 25, 85, and 300 were synthesized using hydrothermal methods, revealing that higher Si/Al ratios enhance specific surface area (387.67 m 2 /g for Si/Al = 300) and mesopore volume (66.4 %). However, humidity reduced the adsorption capacity (e.g., ZSM-5(300) decreased from 85.37 ± 3.60 to 65.76 ± 2.26 mg/g at 80 % RH). To mitigate moisture interference, three LDH-coated composites were fabricated: self-assembled (ZZ-300@LDH), co-precipitated (GC-300@LDH), and sol-gel-derived (RN-300@LDH). Among these, GC-300@LDH exhibited superior hydrophobicity (water contact angle: 53°) and a hierarchical pore structure (mesopore volume: 0.3688 cm 3 /g), achieving a toluene adsorption capacity of 94.43 ± 1.43 mg/g under 80 % RH—43.6 % higher than ZSM-5(300). The dual adsorption sites and enhanced surface roughness contribute to prolonged breakthrough time (6.6 ± 0.3 min) and stable regeneration over five cycles. Comparative analysis with industrial zeolites highlights GC-300@LDH's potential for integration into zeolite rotor-RTO systems, offering a scalable solution for humid industrial VOC treatment.
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NANO
·
2018
·
IF 1.1
Yunlei Zhang,Pei Jin,Minjia Meng,Lin Gao,Meng Liu,Yongsheng Yan
The direct synthesis of metal-organic frameworks (MOFs) with acidic and basic active sites is challenging due to the introduction of functional groups by post-functionalization method often jeopardize the framework integrity. Herein, we report the direct synthesis of acid-base bi-functional MOFs with tuning acid-base strength. Employing modulated hydrothermal (MHT) approach, microporous MOFs named UiO-66-NH 2 was prepared. Through the ring-opening reaction of 1,3-propanesultone with amino group, UiO-66-NH 2 -SO 3 H-type catalysts can be obtained. The synthesized catalysts were well characterized and their catalytic performances were evaluated in one-pot glucose to 5-HMF conversion. Results revealed the acid-base bi-functional catalyst possessed high activity and excellent stability. This work provides a general and economically viable approach for the large-scale synthesis of acid-base bi-functional MOFs for their potential use in catalysis field.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 5
·2693
·
IF 4.9
Xiaofan Liu,Huihui Zhao,Jiatao Xie,Yanping Fu,Bo Li,Xiao Yu,Tao Chen,Yang Lin,Daohong Jiang,Jiasen Cheng
Phytopathogenic fungi normally secrete large amounts of CWDEs to enhance infection of plants. In this study, we identified and characterized a secreted glycosyl hydrolase 5 family member inSclerotinia sclerotiorum(SsGH5,Sclerotinia sclerotiorumGlycosyl Hydrolase 5).SsGH5was significantly upregulated during the early stages of infection. Knocking outSsGH5did not affect the growth and acid production ofS. sclerotiorumbut resulted in decreased glucan utilization and significantly reduced virulence. In addition,Arabidopsis thalianaexpressing SsGH5 became more susceptible to necrotrophic pathogens and basal immune responses were inhibited in these plants. Remarkably, the lost virulence of theΔSsGH5mutants was restored after inoculating ontoSsGH5transgenicArabidopsis. In summary, these results highlight thatS. sclerotiorumsuppresses the immune responses ofArabidopsisthrough secreting SsGH5, and thus exerts full virulence for successful infection.
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DOI
PubMed
高影响因子
Molecular Catalysis
·
2019
·
IF 2.938
Liqin Wang,Heqin Guo,Qiang Wang,Bo Hou,Litao Jia,Jinglei Cui,Debao Li
Furfural, generally achieved from hemicelluloses and its derived pentose, is a high value-added product. The formation of furfural from cellulose and hexose remains challenging. The acid sites in zeolites are the major active sites for preparing furfural from hexose. The catalytic performance of zeolites can be improved by increasing the number of active sites for the preparation of furfural. In this work, HZ-Na free-m and HZ-Na-m zeolites were prepared through without or with adding Na + ions in the mother gels, respectively. GHB (hydrolysate of GBL) was the active site for the formation of acyclic fructose precursor (Intermediate 2). Acyclic fructose production and the following dehydration for producing furfural were favored by the middle strong and strong Brønsted acids in the channels of HZSM-5. Meanwhile, middle strong and strong Brønsted acids were favored the production of HMF from fructose and furfural from xylose. The exterior weak Lewis acid of HZSM-5 could promote the formation of soluble oligomers. The soluble oligomers were composed by HMF and furfural through condensation, etherification, nucleophilic attack and electrophilic attack. HMF molecule was easy to participate in the production of soluble oligomers than furfural molecule over exterior weak Lewis acid of HZSM-5.
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高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 152
·期 11
·3427-3436
·
IF 2.936
Xu Siquan,Xing Xinyi,Wu Han,Shi Xian,Zhang Zongqi,Gao Hui
5-Hydroxymethylfurfural (HMF) is a biomass-derived platform compound with great application potential. Herein, the efficient NbW-SBA-15 series catalysts were prepared by incorporating the niobium and tungsten into the pore wall of SBA-15 mesoporous silica. The physico-chemical features of NbW-SBA-15 catalysts with different proportions of niobium and tungsten were analyzed through ICP-AES, Low/Wide-angle XRD, N 2 adsorption–desorption, SEM, TEM, UV–Vis DRS, Raman spectroscopy, NH 3 -TPD, and Py-FTIR technologies. It was discovered that by changing the incorporating ratio of niobium and tungsten in the pore wall, the acidic nature (acid strength, acid density, and acid ratio) of the catalyst was adjusted, which in turn affected the catalytic performance. As the introduction molar ratio of niobium to tungsten is 1:1, the corresponding [1:1]NbW-SBA-15 catalyst occupied the highest acid density and stronger acid sites, showing the best catalytic activity. A desired HMF yield of 64% was obtained under optimal reaction conditions. Furthermore, after five consecutive testing cycles, the performance of [1:1]NbW-SBA-15 catalyst was maintained, confirming its outstanding hydrothermal stability. Graphical Abstract
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BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
·
2021
·Vol. 95
·期 1
·116-120
·
IF 5.488
Zhu Xin Yi,Yang Xi Nan,Wu Heng,Tao Zhu,Xiao Xin
The interaction between pyridine pillar[5]arene (PyP5) and 2-naphthol with the former as the host molecule and the latter as the guest molecule is studied by fluorescence spectroscopy and NMR techniques, and the results show that PyP5 forms a 1:1 host-guest inclusion complex with 2-naphthol. Although free 2-naphthol has strong fluorescence, it is quenched in 2-naphthol@PyP5. Experiments were conducted with 2-naphthol@PyP5 as a fluorescent probe to detect different anions with results showing that only CO32− causes a significant enhancement of the fluorescence of the fluorescent probe. Due to this high selectivity and high sensitivity, the fluorescent probe 2-naphthol@PyP5 may open up an effective way for the detection of CO32−.
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CHEMICAL PAPERS
·
2016
·Vol. 70
·期 12
·1649-1657
·
IF 1.326
Zhi-Lei Xu,Xiao-Yue Wang,Mei-Yu Shen,Chang-Hai Du
In combination with non-corrosive and low-toxic boric acid, AlCl3 ·6H2O was found to be effective for the synthesis of 5-hydroxymethylfurfural (5-HMF) from glucose. In this work, a 5-HMF yield of ≈ 60 % was obtained at 170°C for 40 min in a H 2 O/THF biphasic solvent mixture. An addition of NaCl not only improved the partition coefficients but also inhibited by-product formation. THF was identified as an ideal extraction solvent in biphasic systems containing C4 solvents. However, low concentration of ZnCl 2 , CoCl 2 ·6H 2 O, MnCl 2 ·4H 2 O, NiCl 2 ·6H 2 O, FeCl 3 ·6H 2 O were not suitable for the catalyst system, while ZrOCl 2 ·8H 2 O, InCl 3 ·4H 2 O showed high activity for the reaction. Boric acid increased the amount of Lewis acid sites in the reactive phase and enhanced the isomerization of glucose to fructose. A mechanism of the AlCl 3 ·6H 2 O and boric acid catalyzed glucose dehydration reaction was proposed to proceed through the isomerization of glucose to fructose followed by the transformation of fructose to 5-HMF.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yan Li,Fan Yang,Xuemei Tan,Yitong Li,Chunjie Gong,Huanan Li,Wanli Cheng,Wenjing Xiao,Jiashu Liu,Zhengbing Jiang
2.5-Furandicarboxylic acid (FDCA) is considered a next-generation bio-based platform chemical that can serve as a precursor to polyethylene furanoate. This study established a dual-enzyme cascade system for FDCA production utilizing lipase from Burkholderia sp. RF7-non_BP1 ( BP 1-Lip) and alcohol oxidase from Colletotrichum gloeosporioides ( Cgl AlcOx). The reaction was carried out in two steps, the molar yield of 5-hydroxymethyl-2-furancarboxylic acid (HMFCA) reached 94.44 ± 3.02 %% after 24 h, and the molar yield of FDCA reached 100 ± 1.96 % after 84 h, with a productivity of 9.29 mg/L/h. In addition, the conversion of 50 mM HMF was successfully achieved by feeding batch substrate addition strategy. After a total reaction time of 264 h, the FDCA concentration reached 41.03 mM, with an FDCA productivity of 24.26 mg/L/h. Molecular docking analysis of BP 1-Lip with HMF showed that the aldehyde group is easily oxidized and can form multiple hydrogen bonds with residues such as Asn110, Lys127, and Asn130. etc.; Lys127 enhances binding stability by localizing substrates through salt bridges and π-cation interactions; Hydrophobic residues Val131 and Tyr292 stabilize the furan ring localization and maintain the ideal conformation of the substrate; The electronic/spatial effects of hydroxymethyl and furan conformations make it difficult for HMFCA and DFF to effectively bind, inhibiting further oxidation.
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高影响因子
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