Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Shaoru Liu,Weizi Zhang,Peng Zhu,Songlin Zuo,Haian Xia
The study reports a facile synthesis of Ag-g-C 3 N 4 /AC composites with highly photocatalytic activity and good adsorption capacity by an impregnation-thermal polycondensation process. The resulting Ag-g-C 3 N 4 /AC composites were used for treatment of different pollutants in water including Rhodamine B (RhB), Cr(VI) ions and pathogens . When the precursor mass ratio of urea and AC was 2:2, the resultant Ag-g-C 3 N 4 /AC catalyst showed the best photocatalytic performances. In particular, the composite photocatalysts exhibited highly bactericidal efficiency, which could reach 99.9% after 120 min of irradiation. The higher photocatalytic performances of Ag-g-C 3 N 4 /AC composites were attributed to the surface plasmon resonance (SPR) effect of Ag nanoparticles (NPs) together with the interfacial synergistic effects. Meanwhile, AC not only exhibited excellent adsorption capacity, but also decreased aggregation of g-C 3 N 4 , which could enhance the separation efficiency of photogenerated charge carriers. It was uncovered through Electron Spin Resonance (ESR) and radical scavenger experiments that • OH radicals, • O 2 − and h + participate in the RhB degradation under the visible light. This work shows that the high-efficient and stable Ag-g-C 3 N 4 /AC composites have a great potential in the treatment of organic pollutants , toxic heavy metals and pathogenic bacteria by adsorption/photocatalysis for practical water treatment .
研究领域:
环境科学
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材料科学
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化学
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水处理
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DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Lijuan Zhu,Wanfeng Hu,Ayesha Murtaza,Aamir Iqbal,Mengjie Kong,Jiao Zhang,Jiaxing Li,Xiaoyun Xu,Siyi Pan
Fresh-cut Chinese water chestnut (CWC) was treated with high pressure CO 2 (HPCD) to inhibit the browning reactions, and the underlying mechanism was investigated in this study. Results showed that HPCD at 2 MPa pressure significantly inhibited lipoxygenase activity and enhanced superoxide dismutase activity, leading to decreased malondialdehyde and H 2 O 2 contents in surface tissue. Moreover, HPCD could reduce total phenols/flavonoids content of surface tissue. Compare with control, homoeriodictyol, hesperetin, and isorhamnetin contents of 2 MPa HPCD-treated samples on day 10 were reduced by 95.72%, 94.31%, and 94.02%, respectively. Furthermore, HPCD treatment enhanced antioxidant enzyme activities, and improved the O 2 – scavenging ability and reducing power of inner tissue. In conclusion, by regulating ROS and membrane lipid metabolism, HPCD treatment with appropriate pressure could retard the biosynthesis of flavonoids and enzymatic oxidation of phenolic compounds in surface tissue, and enhance antioxidant activity of inner tissue, thereby, delaying the quality deterioration of fresh-cut CWC.
研究领域:
食品科学
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植物生理学
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采后技术
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DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Mengmeng Xu,Yuan Liu,Wanru Luo,Fangrong Tan,Donghua Dong,Weichang Li,LinGe Wang,Qianqian Yu
A multi-functional nanocatalytic system based on combined therapies has attracted considerable research attention in recent years due to its potential in the treatment of cancer. Herein, ZnO 2 @ [email protected] nanoparticles (NPs) based on hydroxyl radical (•OH) mediated chemodynamic therapy (CDT) and glucose-exhausting starvation therapy (ST) were constructed. Specifically, in the acidic tumor microenvironment (TME), the pH responsive decomposition of the shell ZIF-67 triggered the release of the Fenton-like catalyst Co 2+ , after which the exposed zinc peroxide (ZnO 2 ) reacted with H 2 O (H + ) to generate O 2 and hydrogen peroxide (H 2 O 2 ). The generated O 2 could alleviate hypoxia in the TEM and interact with ultra-small Au NPs originally coated on ZnO 2 to catalyze intracellular glucose and to produce another source of H 2 O 2 . While the glucose consumption caused the starvation of tumor cells, the generated H 2 O 2 from dual sources reacted with the catalyst Co 2+ to generate highly toxic •OH for CDT. Systematic in vitro and in vivo experiments were carried out to evaluate this nanocatalytic system, and the results showed an enhanced efficacy of this cancer therapy.
研究领域:
癌症治疗
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纳米技术
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生物医学工程
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材料科学
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化学工程
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 12
·期 2
·1176-1184
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IF 11.9
Liwei Su,Lei Zhang,Xingyi Zhan,Yifan Zhang,Lianbang Wang,Yuanhao Wang
Developing efficient cathode catalysts in lithium–oxygen batteries is urgent to solve their challenging problems, such as sluggish Li–O reaction kinetics, low reversible capacities, and short lifespan. This work reports HfO2 as a cathode catalyst for Li–O2 batteries for the first time and studies its working mechanism, activation behavior during cycling, and reversible oxygen defect evolution. First-principles calculations show that fluorite-structured HfO2 has suitable adsorption energy for LiO2, which helps Li2O2 grow in the shape of nanosheets, thereby improving the ultimate discharge capacity and cycling performance. Ex situ techniques (scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy) verified the changes in discharge products during cycling. LiO2 decomposes preferentially over Li2O2 during charging, which differs from previous reports. HfO2 undergoes reversible redox reactions upon cycling, accompanied by rocking-chair oxygen defects. Appropriate oxygen defect contents (6.81–9.32%) can promote the Li–O reaction. On this basis, sub-10 nm oxygen-defect-riched HfO2 particles are homogeneously dispersed on nitrogen-doped carbon nanosheets through the sol–gel method, boosting the battery performance.
研究领域:
材料科学
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电化学
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电池技术
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催化
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Jiadong Hou,Yufeng Liu,Chufei Cheng,Fuhao Cheng,Pengfei Qin,Yang Miao,Weihua Ji,Xiaomin Wang
The limited efficiency of traditional trial-and-error experiments has impeded the development and application of high-entropy fluorite oxides in thermal insulation coatings. To solve this problem, a novel entropy descriptor based on first principles is presented to help select candidate components for synthesizing high-entropy fluorite structure oxides. Results show that the compatibilities of 10 single-phase high-entropy fluorite oxides can be accurately predicted based on entropy formation ability. In the studied (Zr, Hf, Pr, La, X) O 2-δ system, a correlation between thermal characteristics and size/mass differences was established by designing the size and mass of X. Specifically, we found that the thermal conductivity is more strongly correlated with the difference in atomic mass, while the coefficient of thermal expansion is strongly correlated with the difference in atomic size. X-ray photoelectron spectroscopy (XPS) analysis shows that the concentration of oxygen vacancy can effectively reduce the thermal conductivity of high-entropy fluorite oxides. In addition, the values of hardness, elastic modulus and thermal conductivity of five single-phase fluorite oxides are successfully predicted by first principles calculation , and the differences between these values and the experimental results are small, which provides a prospective significance for the performance prediction of high-entropy fluorite oxides. Our findings provide a strategy for customizing high-entropy fluorite single-phase oxides with suitable properties to meet the performance requirements of thermal barrier coatings (TBCs).
研究领域:
材料科学
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热力学
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DOI
高影响因子
Scientific Reports
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2016
·Vol. 6
·期 1
·1-15
·
IF 5.228
Zhang Qingzhe,Bao Nan,Wang Xinqiang,Hu Xinde,Miao Xinhan,Chaker Mohamed,Ma Dongling
In this article, a novel route for the synthesis of graphene/TiO 2 continuous fibers (GTF) using force-spinning combined with water vapor annealing method is reported for the first time. The morphology, structure and optical properties of the composite were fully characterized. With a single step of heat treatment process using steam at ambient conditions, we were able to initiate a series of chemical reactions, such as reduction of graphene oxide (GO), crystallization of TiO 2 , formation of C-Ti bond, and introduction of oxygen vacancies into TiO 2 . The incorporation of graphene in TiO 2 fibers facilitated bandgap narrowing and improved photo-induced charge separation in the photocatalyst. As a result of synergistic effects, TiO 2 fibers-2 wt% graphene (2%GTF) showed the highest photocatalytic activities in the degradation of X-3B under UV irradiation, superior to the benchmark photocatalyst P25. Under visible light irradiation, the same catalyst was about 4 times more efficient compared to pure TiO 2 fibers (PTF). A detailed study of involved active species (in particular, · , h + and ·OH) unraveled the mechanism regarding photocatalysis.
研究领域:
材料科学
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纳米技术
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环境科学
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化学
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DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
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2022
·
IF 6.911
Jiani Li,Tingting Liu,Randy A. Dahlgren,Hanzhang Ye,Qi Wang,Yongli Ding,Ming Gao,Xuedong Wang,Huili Wang
We fabricated a novel N,S-co-doped carbon/Co 1-x S nanocomposite (NSC/Co 1-x S) using a facile sol-gel approach, which featured a multiporous structure, abundant S vacancies and Co-S nanoparticles filling the carbon-layer pores. When the Co 1-x S nanoparticles were anchored onto the surface of N,S-co-doped carbon, a synergistic catalysis action occurred. The NSC/Co 1-x S nanocomposites possessed both peroxidase-like and oxidase-mimetic dual-enzyme activities, in which the oxidase-mimetic activity dominated. By scavenger capture tests, the nanozyme was demonstrated to catalyze H 2 O 2 to produce h + , •OH and •O 2 − , among which the strongest and weakest signals were h + and •OH, respectively. The multi-valence states of Co atoms in the NSC/Co 1-x S structure facilitated electronic transfer that enhanced redox reactions , thereby improving the resultant color reaction. Based on the NSC/Co 1-x S's enzyme-mimetic catalytic reaction, a visual colorimetric assay and Android “Thing Identify” application (app), installed on a smartphone, offered detection limits of 1.93 and 2.51 mg/dl, respectively, in human serum samples. The selectivity/interference experiments, using fortified macromolecules and metal ions , demonstrated that this sensor had high selectivity and low interference potential for cholesterol analysis. Compared to standard assay kits and previously reported visual detection, the Android smartphone-based assays provided higher accuracy (recoveries up to 93.6–104.1%), feasibility for trace-level detection, and more convenient on-site application for cholesterol assay due to the superior enzymatic activity of NSC/Co 1-x S. These compelling performance metrics lead us to posit that the NSC/Co 1-x S-based nanozymic sensor offers a promising methodology for several practical applications, such as point-of-care diagnosis and workplace health evaluations.
研究领域:
材料科学
·
生物化学
·
分析化学
·
生物医学工程
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即时检测
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2026
·
IF 10.4
Qiuya Ji,Kai Ye,Ran Meng,Sijie Wu,Ran Feng,Bao Zhang
To address the conflicting challenges of fat reduction, texture fidelity, and co-delivery of hydrophilic and hydrophobic bioactive compounds, this study explored an innovative O 1 /W/O 2 -microstructured bigel system, WGB(O 1 /W/O 2 ). The system was stabilized through whey protein aggregates rapidly adsorbing at dual interfaces as an amphiphilic mediator, along with hydrogen bonding formation with guar gum in hydrogel matrix. The extended multilayered structure enabled WGB(O 1 /W/O 2 ) demonstrated favorable cream cheese simulation performance in appearance, viscoelastic properties, melting behavior, and texture characteristics. Sequential degradation of each phase during digestion (O 2 -W-O 1 ) increased the intestinal release of PTS and GA by up to 3.3-fold and 1.8-fold, respectively, over conventional bigels (O/W or bicontinuous). Among the bigels, cream cheese texture similarity ranked O 1 /W/O 2 > bicontinuous>O/W. The delivery efficiency for hydrophobic PTS followed O 1 /W/O 2 > O/W > bicontinuous, while that for hydrophilic GA followed O 1 /W/O 2 > bicontinuous>O/W. This study highlights broad application prospects of WGB(O 1 /W/O 2 ) for fat-reduced and nutrient-enhanced dual-functional foods, while advances understanding of bigel microstructure evolution-properties relationships.
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高影响因子
APPLIED CATALYSIS A-GENERAL
·
2011
·
IF 3.384
Hua Yang,Jia-Qi Chen,Jun Li,Ying Lv,Shuang Gao
Hydroxylation of benzene to phenol in the [(CH 3 ) 4 N] 4 PMo 11 VO 40 /ascorbic acid/TEMPO/O 2 catalytic system was carefully investigated. UV–vis, ESR and 1 H NMR studies showed ascorbic acid radicals were formed through the hydrogen exchange of ascorbic acid with TEMPO (2,2,6,6-tetramethyl-1-piperidine-N-oxyl radicals) during the reaction. In acetonitrile, the ascorbic acid would be partly oxidized to 2-hydroxy-2-buten-4-olide (α-tetronic acid, isotetronic acid, compound 1 ) without TEMPO. The interaction of TEMPO and ascorbic acid restrained the oxidative dissociation of ascorbic acid and promoted the rate of the hydroxylation. Aqueous acetic acid solvent can also restrain the oxidative dissociation of ascorbic acid. In aqueous acetic acid, the yield of phenol could reach 18.9% in the [(CH 3 ) 4 N] 4 PMo 11 VO 40 /ascorbic acid/TEMPO/O 2 catalytic system with sufficient ascorbic acid after 400 min.
研究领域:
催化化学
·
有机化学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Chaoqun Niu,Mingke Zhang,Guangping Chen,Bokai Cao,Jiwei Shi,Jie Du,Yong Chen
Polyacrylate polymer is a promising polymer matrix for gel polymer electrolyte (GPE) in lithium-ion batteries . Herein, in-situ polymerized poly(ethylene glycol phenyl etheracrylate) (PEGPEA) based GPE combined with 1 M LiPF6 in ethylene carbonate/dimethyl carbonate/ethyl methyl carbonate (EC/DMC/EMC, 1:1:1 in volume) solvents was introduced. The maximum recoverable strain of the in-situ polymerized PEGPEA-GPE was up to 99%. The outstanding interfacial compatibility between PEGPEA-GPE and the lithium electrode was also obtained. Surprisingly, lithium dendrite was effectively suppressed in charge-discharge cycling because of polymer-enhanced solid electrolyte interphase (SEI) and excellent contact interface. Furthermore, the PEGPEA-GPE exhibited wide electrochemical stability window up to 4.9 V versus Li + /Li, and achieved an ionic conductivity of 3.35 × 10 −3 S cm −1 at 25 °C. When used as electrolyte, the Li[Ni 0.5 Co 0.2 Mn 0.3 ]O 2 /PEGPEA-GPE/Li batteries showed high discharge capacity retention rate of 97.5% after 70 charge-discharge cycles and considerable discharge rate capability, i.e., 155 mAh g −1 0.2C, 142 mAh g −1 0.5C, 120 mAh g −1 1C, 60 mAh g −1 2C. These results demonstrate that this highly elastic in-situ polymerized PEGPEA-GPE is a potential electrolyte system for high-performance polymer electrolyte lithium-ion batteries and has excellent application prospects in wearable and flexible batteries.
研究领域:
材料科学
·
电化学
·
电池技术
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DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 9
·3500-3509
·
IF 8.067
Dongnv Jin,Jiliang Ma,Runcang Sun
Coupling a semimetal with a semiconductor on nitrogen-doped carbon for photocatalytic reforming of biomass-derived feedstocks into high value-added chemicals is of great significance; however, no success has been achieved to date. Here, uniformly dispersed Bi/Bi2O3 nanospheres with a Mott–Schottky heterojunction embedded on the nitrogen-doped biochar nanosheets (Bi/Bi2O3@N-BC) were developed and successfully used in photocatalytic biomass-reforming to lactic acid. A built-in electric field between the interfaces of Bi and Bi2O3 was constructed via the Schottky effect of the Bi/Bi2O3 heterojunction, resulting in the rapid separation/migration of electrons–holes; whereas the N-BC facilitates the adsorption of reactants and the mass transfer of products or by-products. The highest yield of lactic acid reached was 91.21%, and Bi/Bi2O3@N-BC displayed excellent stability, reusability and universality. The experimental results indicated that the contents of photoinduced h+, ˙O2−, ˙OH and 1O2 increased with prolonging the visible-light irradiation time, and trapping tests suggested that ˙O2−, 1O2 and h+ promoted the lactic acid production in turn, whereas ˙OH inhibited the reaction. A 1000-fold scale-up experiment showed that the economically and environmentally viable system has potential for application in the industrial production of lactic acid, and this work also provides an efficient strategy for the development of functional photocatalysts and photocatalytic biorefinery.
研究领域:
材料科学
·
化学工程
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环境科学
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催化
·
生物工程
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yang Jin,Zhicong Lu,Peng Zhang,Fan Li,Tong Li,Lili Zhang,Wenhong Fan,Chun Hu
Herein, a novel BiOBr photocatalyst with partial surface modification by graphitized C (BiOBr-C g ) was synthesized through a hydrothermal method with hydrothermal carbonation carbon (HTCC) as a slow-releasing carbon source and characterized by experimental and theoretical methods. BiOBr-C g exhibited excellent visible-light photocatalytic performance toward various refractory pollutants, such as bisphenol A, ibuprofen, ciprofloxacin, 2,4-dichlorophenoxyacetic acid, and diphenhydramine. The characterization results demonstrate that a strong molecular orbital interaction occurs between graphitized C and BiOBr, resulting in the formation of a new surface valence band on graphitized C. This not only promotes the oxidation of pollutants by surface holes but also reduces the recombination of carriers during the bulk phase transfer process, thereby increasing the number of photogenerated carriers. Intriguingly, the analytical results for degradation intermediates and other characterization techniques demonstrate that the pollutants adsorbed on the graphitized C of BiOBr-C g can be directly excited through light irradiation and react along the organic radical degradation pathway in addition to pollutant degradation by holes and HO 2 • /O 2 •- .
研究领域:
环境科学
·
材料科学
·
化学
·
光催化
·
污染控制
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）