Frontiers in Chemistry
·
2019
·
IF 3.782
Li Renna,Chong Shijia,Altaf Naveed,Gao Yanshan,Louis Benoit,Wang Qiang
In this research, we investigated the hydrophobicity and dynamic adsorption-desorption behaviors of volatile organic compounds (VOCs) by applying different optimized coating dosage (25, 50, and 75%) on designed novel ZSM-5/MCM-41 and ZSM-5/Silicalite-1 hierarchical composites. The relatively large specific surface area and pore volume of adsorbents ZSM-5/MCM-41 and ZSM-5/Silicalite-1 composites with excellent stability were affirmed by ex-situ XRD, FTIR, BET, SEM, and water contact angle analyses. Regarding, toluene adsorption-desorption investigation, ZSM-5/MCM-41 composite lead a longer stable toluene breakthrough time no matter under dry or 50% humid conditions. However, under different loading dosage condition, the breakthrough time of 75% coating ratio was the longest, which was 1.6 times as long as that of pure ZSM-5 under wet adsorption. Meanwhile, the complete elimination of toluene for ZSM-5/MCM-41-75% was done by largest desorption peak area and the lowest desorption temperature of 101.9°C, while, the largest contact angle of ZSM-5/MCM-41-75% was 17.0° higher than pure ZSM-5 zeolite. Therefore, we believe that the present hydrophobic sorbent will provide new insight with great research potential for removing low concentration of VOCs at industrial scale.
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PubMed
高影响因子
Science China-Chemistry
·
2021
·Vol. 64
·期 7
·1088-1095
·
IF 9.445
Zhai Liming,Zhang Bin,Liang Haojie,Wu Huibin,Yang Xinchun,Luo Gen,Zhao Shichao,Qin Yong
The design of efficient iron-based catalysts remains a great challenge for selective cyclohexane oxidation to cyclohexanone under mild conditions. Because of the complex distribution of iron location on the support, the selectivity is always low. Here, we report a general strategy to selectively deposit highly-dispersed FeO x into the micropore of ZSM-5 by atomic layer deposition (ALD). The framework of ZSM-5 and the Brønsted acid sites are intact during ALD, and the Fe species are selectively deposited onto the defect and Lewis acid sites of ZSM-5. Besides, more Fe-O-Si bonds are formed over FeO x /ZSM-5 with a low loading of Fe, while FeO x nanoparticles are generated at high Fe loading. They cannot be realized by the traditional solution method. The obtained FeO x /ZSM-5 catalysts perform high selectivity of cyclohexanone (92%–97%), and ALD cycle numbers of FeO x control the activity. Compared with the Fe nanoparticles, the Fe-O-Si species performs higher turnover frequency and stability in the oxidation reaction.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2021
·Vol. 15
·期 6
·1514-1523
·
IF 4.204
Qu Huaxin,Deng Jie,Wang Bei,Ouyang Lezi,Tang Yong,Yu Kai,Lou Lan-Lan,Liu Shuangxi
A base-free catalytic system for the aerobic oxidation of 5-hydroxymethyl-2-furfural was exploited by using Pt nanoparticles immobilized onto a thermoresponsive poly(acrylamide- co -acrylonitrile)- b -poly( N -vinylimidazole) block copolymer, with an upper critical solution temperature of about 45 °C. The Pt nanocatalysts were well-dispersed and highly active for the base-free oxidation of 5-hydroxymethyl-2-furfural by molecular oxygen in water, affording high yields of 2,5-furandicarboxylic acid (up to >99.9%). The imidazole groups in the block copolymer were conducive to the improvement of catalytic performance. Moreover, the catalysts could be easily separated and recovered based on their thermosensitivity by cooling the reaction system below the upper critical solution temperature. Good stability and reusability were observed over these copolymer-immobilized catalysts with no obvious decrease in catalytic activity in the five consecutive cycles.
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高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 18
·期 4
·1080-1088
·
IF 8.02
Weiwei Hao,Weifeng Li,Xing Tang,Xianhai Zeng,Yong Sun,Shijie Liu,Lu Lin
An efficient process for the catalytic transfer hydrogenation of biomass-derived 5-hydroxymethyl furfural (HMF) to 2,5-bishydroxymethyl furan (BHMF) is presented using ethanol as a hydrogen donor and solvent over low-cost ZrO(OH)2. A HMF conversion of 94.1% and a DHMF selectivity of 88.9% were achieved at 423 K in 2.5 h. The fresh, spent, and regenerated catalysts were characterized comprehensively, and the OH group of ZrO(OH)2 as sites for ligand exchange with ethanol was considered to be important for the activity.
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ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Xuli Xu,Xiaojie Song,Xiaohui Liu,Haifeng Wang,Yongfeng Hu,Jie Xia,Jiacheng Chen,Mohsen Shakouri,Yong Guo,Yanqin Wang
The electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF), one of biomass-derived platform compounds, is an attractive route to produce 2,5-furandicarboxylic acid (FDCA), an important monomer of bio-based polyesters. Here, we successfully synthesized a highly efficient and stable nickel phosphate (Ni3 (PO4)2) electrocatalyst by a simple hydrothermal method for the electrocatalytic oxidation of HMF to FDCA, in which the yield of FDCA reached 94.2% and the Faraday efficiency was 93.5% in 0.1 M KOH. Compared with nickel hydroxide (Ni (OH)2), the introduction of phosphorus enhanced the charge transfer ability of Ni-based catalysts by EIS and Tafel slope analysis. At the same time, the Ni2+ species in Ni3(PO4)2 was more likely to be oxidized to active nickel species than that in Ni (OH)2 from XPS and in situ Raman results. Moreover, in situ attenuated total reflection-surface enhanced infrared absorption spectroscopy (ATR-SEIRAS) over Ni3(PO4)2 were carried out to study the changes of nickel phosphate during the electrocatalytic oxidation of HMF. According to ATR-SEIRAS, XPS, and Raman results, it can be concluded that Ni2+ species under applied potential in KOH solution was transformed to the high-valence nickel species/Ni3+ species with P–OH and the ring-shaped P–O group. In addition, the phosphorus group was also involved in the electrocatalytic oxidation of HMF. Based on these evidences, a complete electrocatalytic oxidation process of HMF to FDCA on Ni3(PO4)2 was proposed.
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高影响因子
CRYSTENGCOMM
·
2021
·Vol. 24
·期 1
·95-106
·
IF 3.545
Yunping Zhoujin,Yang Tao,Panpan Zhou,Sean Parkin,Tonglei Li,Ju Guo,Faquan Yu,Sihui Long
Addition of methyl group(s) to either or both aromatic rings of fenamic acid (FA) afforded three FA derivatives (1–3), designed to investigate the effect on the polymorphic behavior of these compounds exerted by substitution. A relatively comprehensive polymorph screen led to the discovery of four polymorphs for compound 3, for which substitution took place on both aromatic rings, in contrast to the production of either two or one form(s) for compounds 1 and 2, both of which are mono-substituted. The observation indicated that both substitution position and pattern are important in the polymorphism of these compounds. The thermal properties of each system were investigated by differential scanning calorimetry (DSC). Conformational scans and Hirshfeld surface analyses were performed to study the mechanism of polymorphism and the intermolecular interactions contributing to the stability of each crystal form.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Xiaojin Fu,Sijie Li,Jing Wen,Fuyan Kang,Congying Huang,Xiaogang Zheng
ZnFe 2 O 4 -coated Ag nanowires (Ag@ZnFe 2 O 4 NWs) were prepared for the photo-Fenton induced dehydration of fructose into 5-hydroxymethylfurfural (5-HMF) in visible light region. Effects of ZnFe 2 O 4 content, volume ratio of dimethyl sulfoxide (DMSO) to deionized water, reaction temperature, fructose dosage, H 2 O 2 content, pH values, inorganic ions, and quenchers on the fructose conversion, 5-HMF yield, and 5-HMF selectivity were performed in detail. Among these obtained composites, Brønsted acidic Ag@ZnFe 2 O 4 NWs with Ag NWs diameter of around 20 nm and ZnFe 2 O 4 coating of 6.13 wt% exhibit the best photo-Fenton catalytic activity for the conversion of fructose into 5-HMF, and slightly deactivate after five cycle times. The surface plasmon resonance effect of Ag NWs and the synergistic effect between ZnFe 2 O 4 and Ag NWs are favorable for the visible light absorption and the efficient transfer and separation of charge carriers. DMSO as well as OH radical plays the vital role in the photo-Fenton induced dehydration of fructose into 5-HMF.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2021
·
IF 5.541
Yi Wei,Xiying Jia,Chaoyue Shen,Huijuan Ying,Fengwen Yu,Jianbing Ji
Digestate (DE), the residue following anaerobic digestion , has been well utilized as a potential feedstock of molten carbonates pyrolysis and catalytic reforming . The lignin of DE was converted into phenolics, guaiacols and furfural with molten carbonates pyrolysis, and further upgraded to bio-based monophenols by coupling with modified HZSM-5 catalyst. The maximum monophenols yield could achieve 7.22 g/100 g of digestate, and 81.34% of the organic phase of bio-oil at the optimum reaction conditions. The alkali-treated and Fe-loaded on HZSM-5 catalyst, with enhanced pore diameter distinctly and mild acidity, has an outstanding selectivity for monophenols and preferable anti-coking ability in integrated pyrolysis system, while with quite a low catalyst coke yield of 3.97%. The results indicated that the formation of mesopores might minimize the diffusion hindrance of the reactant molecules and reduce coke accumulation. In addition, according to the experiment conducted on a self-designed thermogravimetric analysis device, the kinetic study of the digestate with molten carbonates certificated that the reaction rate of pyrolysis had been promoted by both decreasing activation energy and intensification of heat transfer.
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高影响因子
JOURNAL OF ENZYME INHIBITION AND MEDICINAL CHEMISTRY
·
2023
·
IF 5.6
Hao Zhou,Mengjiao Li,Hui Liu,Zheng Liu,Xuekun Wang,Shiben Wang
In this study, four series of piperazine derivatives were designed, synthesised and subjected to biological test, and compound 6a with potential antidepressant activity was obtained. An affinity assay of compound 6a with 5-hydroxytryptamine (serotonin, 5-HT)1A receptor (5-HT1AR) was undertaken, and the effects on the 5-HT level in the brains of mice were also tested. The results showed that compound 6a had the best affinity with 5-HT1AR (Ki = 1.28 nM) and significantly increased the 5-HT level. The expression levels of 5-HT1AR, BDNF, and PKA in the hippocampus were analysed by western blot and immunohistochemistry analyses. The results showed that the expression of 5-HT1AR, BDNF, and PKA in the model group was reduced compared to that of the control group, and compound 6a could reverse this phenomenon. Molecular docking was performed to investigate the interactions of the studied compound 6a with 5-HT1AR on the molecular level.
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DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 43
·33809-33813
·
IF 3.84
Bo Xiao,Ying Fan,Rui-han Gao,Peng Chen,Jian-xin Zhang,Qing-di Zhou,Sai-Feng Xue,Qian-Jiang Zhu,Zhu Tao
A one-pot strategy was employed to synthesize a series of cucurbit[5]uril-anchored (Q[5]-anchored) polymers with high yields. The acrylic acid (AA) monomer, an ammonium persulfate salt (APS) initiator, and an oxidant were used in the polymerization. The Q[5]-anchored polyacrylic acid aggregates (Q[5]-PAA) have been characterized by 1H NMR, 13C NMR, 2D NMR, FTIR, TGA, GPC, TEM and SEM measurements. The experimental results confirm that PAA chains can be grafted to Q[5] in a controlled manner through an in situ radical polymerization approach. The effects of acrylic acid and Q[5] feed mass and APS concentration on the formation of polymer nanocapsules have been investigated. The experiments reveal that the feed mass of acrylic acid greatly influences the properties of Q[5]-PAA when the ratio of Q[5]/APS is fixed at 0.5. In particular, when APS/Q[5] = 46 and 72, vesicle structures are observed in the Q[5]-anchored polymers. Moreover, such polymer nanocapsules show selective absorption of some volatile compounds, particularly methanol.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Renna Li,Tianshan Xue,Zhe Li,Qiang Wang
Hydrophobic zeolites have been considered as one of the most promising adsorbents for capturing volatile organic compounds (VOCs). In this contribution, hierarchically structured ZSM-5/SBA-15 composites with different morphologies including platelet, hexagonal prism, long-hexagonal prism, and long-rod were prepared. All materials were characterized using XRD, SEM, and TEM-EDX, which confirmed that the high dispersion of two zeolites within the composites. Due to the presence of intracrystalline mesopores that could shorten the diffusion pathway of toluene, the composites resulted in increased effective diffusion and higher adsorption capacity. The composites also possess higher hydrophobicity, leading to much better toluene adsorption performance under humid conditions. The water contact angle of ZSM-5 could be increased from 15.6° to 44.9° by forming well dispersed zeolite composites. The 29 Si MAS NMR results confirmed that the composites possess higher amount of Q 4 groups (75.3%–80.1%), which is the intrinsic reason for higher hydrophobicity. Notably, ZSM-5/SBA-15-hexagonal prism resulted in the best adsorption performance and cycling stability when compared with pure ZSM-5, the breakthrough time was increased from 20.8 to 49.4 min under dry conditions and from 5.9 to 27.3 min in the presence of 50% relative humidity. This work represents an important scheme for making hydrophobic zeolite-based VOCs adsorbents with also improved toluene diffusion properties due to the unique hierarchical porous structure.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Bing Liu,Xingjian Lu,Xiaokun Liao,Hao Zou,Junting Tao,Chuyao Ni,Jiaqi Pan,Chaorong Li,Yingying Zheng
Amphiphilic graphene quantum dots (A-GQDs) reveal prodigious potential application in bioimaging, resulting from their hydrophilic and lipophilic properties, as well as their good biocompatibility and negligible cytotoxicity. Herein, green fluorescent A-GQDs with single-layer graphene structure were prepared by one step of hydrothermal method. The A-GQDs with the average size of 3.5 nm displayed excitation-independent emission due to uniform size. A-GQDs emitted bright fluorescence on the surface of the cell membrane of MCF-7 cells when they were co-cultured with MCF-7 cells, which was similar to that of QSG-7701 cells. The water-soluble pillar[5]arene (WP5) was then incorporated on to the A-GQDs via π-π interaction and electrostatic interaction. There was different labeling imaging effect of MCF-7 and QSG-7701 cells achieved by combining the merits of WP5 and A-GQDs compared with individual A-GQDs. The synthesized composites not only had a certain enhancement in fluorescence, but also constructed a penetrating channel through the cell membrane, so that the entire cell had a distinct imaging. Therefore, these composites might be a potential candidate for applications in visualization of cell membrane and bioimaging.
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