Small Methods
·
2019
·Vol. 3
·期 10
·1900187
·
IF 0
Aruuhan Bayaguud,Zhibo Zhang,Maoning Geng,Yanpeng Fu,Yan Yu,Changbao Zhu
The development of cathode materials with high Li storage capacity and fast Li-ion diffusion kinetics is considered to be a promising way to extend the energy and power densities of Li-ion batteries (LIBs). As potential high-capacity cathode materials for LIBs, polyoxometalates (POMs) suffer greatly from inherent drawbacks. Therefore, another possibility for the application of POMs in LIBs is shown, which is to transform POMs into relevant 3D porous Li-containing oxides. Here, a unique 3D porous γ-LiV 2 O 5 film is successfully prepared by combining the electrostatic spray deposition technique and the POM as a precursor. Outstanding high capacity with stable cycling performance and excellent rate capability is realized based on 3D porous nanostructure and thin-film morphology, which effectively facilitate the transport of both lithium ion and electron. Moreover, this work demonstrates the feasibility of achieving high-performance metal oxide cathode by the transformation of POMs and also shows the superiority of γ-phase over α-phase as a starting cathode material in LIBs as well.
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JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Hongsheng Liu,Hengyue Li,Bin Huang,Yange Yang,Haibo Guo,Yan Xiao,Weiguang Yang
To enhance the proton conductivity and durability of Ce-based hybrid proton exchange membranes (PEMs), this study fabricates modified perfluorosulfonic acid (PFSA) hybrid membranes by incorporating the dual-function γ-AlOOH@Ti-supported CeO 2 composite oxide (γ-AlOOH@Ti/CeO 2 ). In addition to combining the inherent proton conductivity of γ-AlOOH with the excellent radical scavenging ability of CeO 2 , both the proton conductivity and durability of Ce-based PEMs are further improved by introducing Ti-dopant, which not only increases hydrogen vacancies on the surface of γ-AlOOH, which facilitate proton conduction, and induces electron transfer from γ-AlOOH@Ti to CeO 2 , which enhance free radical adsorption. As results shown, the proton conductivity and the fluoride release value of the resulting hybrid membrane are about 76 % higher and 35.25 % lower than those of the PFSA-CeO 2 membrane, respectively. Moreover, the performance of cells shows that, after accelerated degradation testing, the PFSA-γ-AlOOH@Ti/CeO 2 membrane exhibits the lowest peak power density decrease rate, the impedance increase rate and hydrogen crossover current density, with 11.79 %, 27.54 % and 3.04 mA cm −2 , respectively. These results suggest that compared to CeO 2 -hybrid PEMs, γ-AlOOH@Ti/CeO 2 -based hybrid PEMs exhibit higher proton conductivity and superior chemical stability, indicating the potential application of γ-AlOOH@Ti/CeO 2 -based hybrid PEMs in proton exchange membrane fuel cells.
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CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Fei Chen,Feng Wang,Qing Li,CaiYuan Cao,Xiang Zhang,Hua Ma,Yu Guo
Different catalyst supports, namely: commercial Degussa P25 TiO 2 , anatase TiO 2 (CC), γ-Al 2 O 3 , and lab-synthesized AlOOH were used to prepare Pt-based catalysts for the room temperature formaldehyde oxidation. XRD, BET and XPS were conducted to characterize the bulk structure of support, the oxidation state of surface elements and the ratio of oxygen in hydroxyls to the total surface oxygen, as well as textural properties of catalysts. For the first time, a long-term activity test at 0% relative humidity was conducted to investigate relationships between the activity of the Pt-based catalysts with Pt dispersion and oxidation state and the relative abundance of surface OH groups. Pt/AlOOH showed the best activity, whereas Pt/P25 TiO 2 gave the worst activity. We consider that both the surface hydroxyl groups and the Pt dispersion are indispensable, and both act synergistically. The specific surface area is not the decisive factor for the present reaction.
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高影响因子
OZONE-SCIENCE & ENGINEERING
·
2019
·
IF 1.253
Wencan Qi,Jing Wang,Xie Quan,Shuo Chen,Hongtao Yu
Heterogeneous catalytic ozonation is an efficient technology for degrading refractory organic pollutants in water. However, most studied heterogeneous catalysts for catalytic ozonation were powders, which were not practically available for continuous fixed-bed reactor in water treatment. In this work, manganese, iron and cerium oxides on γ-Al2O3 pellets were synthesized and used as heterogeneous catalysts for catalytic ozonation in a continuous fixed-bed reactor. Results showed that all the prepared metal oxides on γ-Al2O3 pellets exhibited facilitated catalytic ozonation for degrading refractory contaminates compared with ozonation alone and catalytic ozonation on pure γ-Al2O3 pellets. The cerium oxides supported on γ-Al2O3 pellets (CeO2/γ-Al2O3) performed best catalytic performance with the COD removal efficiency of 64.3% and TOC removal efficiency of 41.7%. Moreover, the catalytic activity was further enhanced by the synergistic effect of the bimetallic oxides on γ-Al2O3 pellets (CeO2-Fe2O3/γ-Al2O3). This study is expected to help to encourage further research and applications in AOPs based on the success of this work in designing heterogeneous catalysts available for continuous fixed-bed reactor.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Bing Tan,Qian Wang,Qiaoli Liu,Yimei Wu,Luyao Ban,Yingli Yan,Xiang Li,Guifen Zhu,Jing Fan,Huimin Zhao
Cyclodextrin metal-organic framework (CD-MOF) with environmentally friendly components has attracted enormous attention in the past few decades. However, the fragile aqueous stability has limited its application in aqueous catalysis. In this work, we have devised a novel strategy to cope with the problems by introducing the well-defined gold nanoclusters (AuNCs) onto the cyclodextrin ligand through host-guest chemistry. The combination with AuNCs endowed the fragile CD-MOF with excellent multi-enzyme mimicking catalytic abilities, including peroxidase (POD), oxidase (OXD), catalase (CAT) and glucose oxidase (GOx)-mimetic activities. Furthermore, based on its intrinsic POD-like activities, by constructing the typical enzyme cascade reaction, a colorimetric sensor based on Au 38 /γ-CD-MOF was developed for the rapid and sensitive of carbaryl and butyrylcholinesterase (BChE) activity, respectively. In addition, combined with the smartphone, a portable paper-based sensor was developed, which could realize the on-site and semiquantitative detection of pesticide residues by identifying the RGB value. This low-cost and easy-operation portable assay shows great potential for online detection of pesticides exposure and monitoring other disease biomarkers.
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高影响因子
Chemistry of Heterocyclic Compounds
·
2021
·Vol. 57
·期 7
·806-816
·
IF 1.277
An Xiaoying,Gao Lei,Wang Mingliang,Wu Haitao,Wang Lanzhi
Novel, efficient and environmentally friendly approaches have been developed for the synthesis of 1,5-benzodiazepine-2,3-dicarboxylates by one-pot three-component domino reactions in the presence of a catalytic amount of γ-Fe 2 O 3 @SiO 2 /Ce(OTf) 3 in EtOH at ambient temperature. A total of 32 2,5-dihydro-1 H -1,5-benzodiazepine-2,3-dicarboxylates and 2-methyl-2,3-dihydro-1 H -1,5-benzodiazepine-2,3-dicarboxylates with enamine or imine structure of the heterocycle, respectively, were obtained in good yields by reacting substituted 1,2-phenylenediamine, β-carbonyl esters, and ethyl glyoxylate or ethyl pyruvate. One-pot reactions were successfully realized to form one new cycle and four new bonds (one C–C, two C–N, one C=C or two C–C, one C–N, one C=N). Furthermore, plausible mechanisms for the formation of 1,5-benzodiazepine-2,3-dicarboxylates have been proposed. The salient features of this reaction include short reaction time, mild reaction conditions, moderate to excellent yields, recyclability of the catalyst, and wide substrate scope.
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RENEWABLE ENERGY
·
2022
·
IF 8.634
Yue Wang,Huai Liu,Junhua Zhang,Yuan Cheng,Wansi Lin,Rulu Huang,Lincai Peng
The development of efficient and reusable catalysts to improve the catalytic transfer hydrogenation (CTH) of biomass-derived platform molecules into high value-added chemicals is always desired. For this purpose, the magnetic Fe 3 O 4 @Zr-FDCA hybrid with Lewis acid and Lewis base sites was first designed by simple assembly of biomass derived 2,5-furandicarboxylic acid (FDCA) with zirconium and grown directly on the surface of carboxylated Fe 3 O 4 . The resulting Fe 3 O 4 @Zr-FDCA exhibited a unique core-shell structure with high specific surface area and proper acid/basic strength, it performed well in CTH reaction of diverse carbonyl compounds, especially for the conversion of ethyl levulinate to γ-valerolactone with the yield of 94.5% at 180 °C for 5 h. Furthermore, the good magnetic responsibility of Fe 3 O 4 @Zr-FDCA made it could be easily separated from the reaction mixture by an external magnet, and displayed a good reusability with no significant loss in the activity after reuse for five runs.
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ChemSusChem
·
2018
·Vol. 11
·期 14
·2332-2339
·
IF 7.411
Zhong-Yu Xie,Jin Deng,Yao Fu
Graphical Fatty acids slim down : A new method for γ-lactone preparation based on ring contraction has been developed. Starting from macrolides, W(OTf) 6 was used to catalyze ring-opening polymerization then depolymerization to produce the stable five-membered γ-lactones in the ionic liquid [EMIM]OTf. γ-Lactones were also produced when the substrate was extended to terminal hydroxyfatty acids. γ-Lactones are an important class of fine chemical products and are widely used in perfumes, medicines, pesticides, dyes, and other fields. Herein, a new method for γ-lactones preparation based on ring contraction was developed. Starting from macrolides, W(OTf) 6 was used to catalyze the ring-opening polymerization then depolymerization. The depolymerization step was not a common ring-closing process, and the carbon number of the ring was reduced one by one by rearrangement to form the most thermodynamically stable five-membered ring compounds. γ-Caprolactone (180 °C for 10 h) was obtained in a yield of 94 % when [EMIM]OTf was used as the solvent, and the yield of isolated product was up to 85 %. The interaction of various components and the reaction mechanism were studied by FTIR spectroscopy and 1 H NMR spectroscopy, respectively. Furthermore, γ-lactones could be produced when the substrate was extended to terminal hydroxyfatty acids. Unexpectedly, the catalyst was poisoned by 1 equivalent of H 2 O added during the process and thus the yield decreased greatly. The reaction is green and simple, and proceeds in one pot with high atom economy (100 % for macrolides and with water as the only byproduct for terminal hydroxyfatty acid), which provides a promising approach to synthesizing γ-lactones.
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PubMed
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CARBOHYDRATE POLYMERS
·
2026
·
IF 13.2
Dexue Liu,Sajid Asghar,Zeyu Chen,Yueting Lv,Haijuan Dong,Haifeng Zha,Zhipeng Chen,Yanyu Xiao
In this study, we engineered pH/glutathione dual-responsive nanoparticles (LP/CC-Cu-Cur NPs) based on a poly-γ-glutamic acid (γ-PGA)/chitosan (CS) core-shell architecture for synergistic chemo/chemodynamic therapy of glioma. The nanoparticles feature a core of CC-Cu-Cur NPs, formed via Cu 2+ -coordinated self-assembly of caffeic acid-grafted CS and curcumin (Cur), encapsulated within a phenylboronic acid-conjugated γ-PGA shell through pH-sensitive borate ester bonds. Surface modification with lactoferrin conferred brain-penetrating and glioma-targeting capabilities. The resulting spherical nanoparticles had a uniform size of 235.89 nm, a zeta potential of −22.66 mV, and high Cur loading (6.02%) and encapsulation efficiency (83.09%). Upon exposure to the acidic tumor microenvironment, the nanoparticle shell detaches, reversing surface charge from negative to positive, thereby enhancing cellular uptake and mitochondrial targeting. Intracellular glutathione then triggers core degradation, releasing Cur and Cu 2+ . Cur induces mitochondrial apoptosis, while Cu 2+ catalyzes a Fenton-like reaction, converting endogenous hydrogen peroxide into highly cytotoxic reactive oxygen species. In vitro, the nanoparticles showed enhanced blood-brain barrier penetration, efficient lysosomal escape, and potent cytotoxicity against GL-261 cells (IC 50 = 18.34 μg/mL) via a synergistic action of Cu 2+ and Cur (CI = 0.28). In vivo, LP/CC-Cu-Cur NPs achieved superior brain accumulation and antitumor efficacy, highlighting their potential as a promising strategy for glioma therapy.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Ding Liu,Zhenkun Su,Bo Han,Kaisheng Xia,Chenggang Zhou,Qiang Gao
Cobalt–aluminum oxide clusters-embedded γ-Al 2 O 3 nanosheets (CAO@AO) were facilely fabricated and developed for peroxymonosulfate (PMS) activation. Interestingly, the Al–OH-rich amphiphilic surface of CAO@AO endowed the catalyst with unique interfacial pH-buffering property, which stabilized the reaction media at nearly neural level and thus prevented the cobalt sites from leaching. Moreover, the presence of Al–OH groups around the Co−Al oxide clusters facilitated the activation of PMS and the redox cycle of Co 2+ /Co 3+ , which resulted in a boosted catalytic activity. Consequently, the CAO@AO exhibited zero leaching of cobalt and high efficacy for PMS activation, enabling complete and ultrafast removal of metronidazole with a significantly higher turnover frequency (TOF, 1.83 min −1 ) than that of Co 3 O 4 (0.004 min −1 ). It was also demonstrated that introducing suitable foreign metal into CAO@AO could further enhance the catalytic activity (e.g., TOF of Mn(40%)-CAO@AO: 5.80 min −1 ). Furthermore, Mn(40%)-CAO@AO-decorated granular support was synthesized that dominated a continuous-flow degradation in column reaction system.
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高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 41
·15797-15805
·
IF 4.569
Jiawei Wu,Bangfu Ding,Xin Qian,Liang Mao,Huibin Zheng,Lei Zhang,Shukai Zheng,Junying Zhang
The Bi2MoO6 nanosheets are loaded on to γ-Bi2O3 tetrahedron surfaces to form Bi2MoO6/γ-Bi2O3 heterojunctions using a simple calcination method. The photocatalytic degradation efficiencies of the lomefloxacin and the Rhodamine B using the optimum sample are 96% and 99%, respectively, much higher than that of pure phase samples. When the waters from different regions in China were used as solvents, the removal efficiencies of the lomefloxacin and the Rhodamine B are still higher than 88% and 90%, respectively, which shows excellent prospects for practical applications. The photocatalytic degradation efficiencies of these two pollutants are higher than 91% and 95% in the five cycling tests, and the crystal structure of the sample is not changed after cycling. Based on the first-principles calculation, Bi2MoO6 and γ-Bi2O3 form a Z-type energy band structure which accelerates the separation of the photogenerated charge carriers. The Bi2MoO6 valence band potential of 3.25 V and the γ-Bi2O3 conduction band potential of −0.21 V are reserved to generate ˙OH− and O2−, respectively, for the photocatalytic reaction. The degradation of the lomefloxacin is ascribed to the shedding of functional groups and bond breaking with the final products being CO2, F−, H2O, and NO3−. This research shows that Bi2MoO6/γ-Bi2O3 heterojunctions can be employed to purify domestic and textile industrial sewage.
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FOOD AND CHEMICAL TOXICOLOGY
·
2022
·
IF 5.572
Yue-Qiang Huang,Yi-Xi Tang,Bai-Hao Qiu,Milton Talukder,Xue-Nan Li,Jin-Long Li
Di-2-ethylhexyl phthalate (DEHP) has been widely used in many fields (agricultural products, medical instruments, and food packing). As an environmental contaminant, DEHP has a negative impact on human and animal health, and thus toxicity caused by DEHP is increasingly serious health concern. Nevertheless, DEHP-induced liver damage in quail remains unclear. To investigate the mechanism of liver damage caused by DEHP, male quail were treated with DEHP (250, 500, and 750 mg/kg) by gavage. Notably, DEHP exposure results in increased blood lipids and the accumulation of triglycerides (TG), total cholesterol (TC), and non-esterified fatty acid (NEFA) in the liver. Histopathological analysis showed that steatosis and inflammatory cell infiltration were observed in the liver tissue of quails exposed to DEHP. The results of Oil Red O staining displayed that DEHP induced lipid storage in the liver. Moreover, DEHP induced lipid metabolism disorders by activating the LXR / SREBP-1c and PPARα / γ signaling pathway. DEHP exposure obviously caused the up-regulation of pro-inflammatory cytokines ( NF-κB , IL-6 , IL-8 , IL-1β , and TNF-a ). This study showed that DEHP could induce lipid metabolism disorders and inflammatory response via LXR / SREBP-1c / PPARα / γ and NF-κB signaling pathways.
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高影响因子
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