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Atomically precise nickel-sulfur clusters for efficient electrochemical 2,5-hydroxymethylfurfural oxidation

Nano Research 2025年第1期18卷 140-148页

作者： fen wang Lu-Yu Liu Sha-Sha Cui Ting-Ting Li Xiao-Meng Yang Zhijuan Liu Yanyong wang Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis Centerand College of ChemistryZhengzhou UniversityZhengzhou 450001China State Key Laboratory of Chem/Bio-sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

Nickel sulfide exhibits excellent catalytic activity in the electrochemical 2,5-hydroxymethylfurfural oxidation reaction(HMFOR).However,due to the polydispersity of nanoparticles,it is difficult to establish a clear structure-activity relationship at the atomic *** this work,we have successfully synthesized atomically precise Ni_(6)(PET)_(12)and Ni_(4)(PET)_(8)clusters(PET:2-phenylethanethiol)for ***^(2+)and S_(2)-with atomic ratio of 1:2 was mainly existed in Ni_(6)(PET)_(12)and Ni_(4)(PET)_(8)to form Ni-S *** electrochemical test results have suggested both Ni_(6)(PET)_(12)and Ni_(4)(PET)_(8)displayed outstanding electrocatalytic ability for *** Ni_(6)(PET)_(12)exhibited better electrocatalytic ability than Ni_(4)(PET)_(8)with higher current density,lower overpotential and faster reaction *** superior electrochemical ability of Ni_(6)(PET)_(12)may be due to the enhanced adsorption towards HMF molecule with strong interaction towards hydroxyl group and furan ***,it found that the Ni^(2+)species in Ni_(6)(PET)_(12)could rapidly oxidized into Ni^(3+)species,which could spontaneously capture electron and proton from HMF for *** theoretical calculation demonstrated that the Ni_(6)(PET)_(12)process lower free energy barrier than Ni_(4)(PET)_(8)to display excellent electrocatalytic *** work is of great significance for designing efficient electrocatalysts for HMFOR.

关键词： atomically precise nickel nanoclusters 2 5-hydroxymethylfurfural electro-oxidation Ni3+species

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Novel Fe/glass composite adsorbent for As(V) removal

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Journal of Environmental Sciences 2009年第4期21卷 434-439页

作者： wang Ying ZHU Kongjun wang fen YANAGISAWA Kazumichi College of Materials Science and Engineering Shaanxi University of Science and Technology Shaanxi 710021 China The Aeronautical Key Laboratory for Smart Materials and Structures Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Research Laboratory of Hydrothermal Chemistry Kochi University Kochi 780-8520 Japan

An effective adsorbent for arsenic removal was synthesized by hydrothermal treatment of waste glass powder （GP）, followed by loading Fe（Ⅲ） oxyhydroxide onto the surface of waste glass powder. The =Si-O-H group was formed on the surface of GP and the specific surface area of GP powder was slightly increased after hydrothermal treatment. FeOOH was loaded onto the surface of hydrothermally treated waste glass powder （HGP） by the hydrolysis of FeC13. The formation conditions of FeOOH were also investigated. The ability of this new adsorbent for arsenic （As（V）） removal was evaluated. The results indicated that the highest removal efficiency was about 97% for 1 mg/L As（V） solution at pH 6 and keeping time 2 h.

关键词： arsenic removal adsorbent iron oxide hydrothermal treatment

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Luminescence of samarium doped hydroxyapatite containing strontium:Effects of doping concentration

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Journal of Rare Earths 2022年第3期40卷 398-405,I0002页

作者： Pu Chen fen wang Yinpo Qiao Zhen Zhang Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials School of Materials Science and EngineeringShaanxi University of Science and TechnologyXi'an 710021China

A series of samarium(Sm)doped hydroxyapatites containing strontium(Sr)with controllable and adjustable luminescence were designed and prepared via chemical hydrolysis co-precipitation *** effects of doping concentration of Sm on the structure,composition,photoluminescence(PL),energy transfer,substitute site,fluoresce lifetime and luminescence color of samples were *** is shown that the introduction of Sr ions induces the structure and composition change for Sm doped *** typical transitions of Sm^(3+) at 564,601,648 and 707 nm due to^(4)G_(5/2)→^(6)H_(J/2)(J=5,7,9 and 11)transition under the excitation of 404 nm were *** PL intensity is affected by the Sr/Ca ratio and Sm concentration,and the optimal concentration of Sm is 0.8 mol%when Sr/Ca ratio equals 7/*** non-radiative transitions and energy transfer of Sm ions are the main reason for the quenching,and the interactions among ions are ascribed to dipole-dipole type by theoretical ***,the ratio of PL intensity between 601 and 648 nm(r_(O/R)=I_(601nm)/I_(648nm))indicates the symmetry and substitution process of Sm ions to Ca/Sr *** fluorescence lifetime(τ)decreases with the concentration of Sm increasing,which is the result of the decrease of distance and the enhanced interaction between Sm *** CIE chromaticity coordinates and luminescence color of samples are in the orange-red region and have close relation with the concentration of ***,the cytotoxicity evaluation and confocal laser scanning microscopy(CLSM)observation of samples via cells indicate the good biocompatibility and safe use of this kind of bio-based luminescent materials for their potential efficient fluorescence labeling and detection.

关键词： Samarium Strontium Hydroxyapatite Photo-luminescence Energy transfer Cytotoxicity evaluation

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Achieving biodegradability enhancement and acute biotoxicity removal through the treatment of pharmaceutical wastewater using a combined internal electrolysis and ultrasonic irradiation technology

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Frontiers of Environmental Science & Engineering 2011年第3期5卷 481-487页

作者： Liang SUN Can wang Min JI fen wang School of Environmental Science and Engineering Tianjin UniversityTianjin 300072China

Actual pharmaceutical wastewater was treatedusing a combined ultrasonic irradiation (US) and iron/cokeinternal electrolysis (Fe/C) technology. A significantsynergetic effect was observed, showing that ultrasonicirradiation dramatically enhanced the chemical oxygendemand (COD) removal efficiencies by internal *** effects of primary operating factors on CODremoval were evaluated systematically. Higher ultrasonicfrequency and lower pH values as well as longer reactiontime were favorable to COD removal. The ratio ofbiochemical oxygen demand (BOD) and COD (B/C) ofthe wastewater increased from 0.21 to 0.32 after US-Fe/Ctreatment. An acute biotoxicity assay measuring theinhibition of bioluminescence indicated that the wastewaterwith overall toxicity of 4.3 mg-Zn^(2+)·L^(-1) wasreduced to 0.5 mg-Zn^(2+)·L^(-1) after treatment. Both the rawand the treated wastewater samples were separated andidentified. The types of compounds suggested that theincreased biodegradability and reduced biotoxicityresulted mainly from the destruction of N,N-2 dimethylformamide and aromatic compounds in the pharmaceuticalwastewater.

关键词： internal electrolysis ultrasonic pharmaceutical wastewater biodegradability acute biotoxicity

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Oxidation behavior of in-situ Al_2O_3/TiAl composites at 900°C in static air

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 339-344页

作者： Tao-tao Ai fen wang Xiao-ming feng Department of Materials Science and Engineering Shaanxi University of Technology Hanzhong 723003 China School of Materials Science and Engineering Shaanxi University of Science and Technology Xi＇an 710021 China

In-situ Al2O3/TiAl composites were successfully synthesized from the starting powders of Ti, Al, TiO2 and Nb2O5. The oxidation behavior of the composites at 900℃ in static air was investigated. The results indicate that the composite samples present a much lower oxidation mass gain. Under long-time intensive oxidation exposure, the formed oxide scale is multi-layer. The formation of the outer TiO2 layer is fine and dense, the internal Al2O3 scale has good adhesiveness with the outer TiO2 scale, and the TiO2＋Al2O3 mixed layer forming the protective oxide scale is favorable for the improvement of oxidation resistance. It is believed that the incorporation of Al2O3 particulates into the metal matrix decreases the coefficient of thermal expansion of the substrate, and forms a local three-dimensional network structure that can hold the oxide scale. The formation of the oxide scale with finer particle size, stronger adherence, less micro-defects and slower growth rate can contribute to the improvement of oxidation resistance. Nb element plays an important role in reducing the internal oxidation action of the materials, restraining the growth of TiO2 crystals and promoting the stable formation of the Al2O3-riched layer, which is beneficial to improve the oxidation properties.

关键词： intermetallic matrix composites alumina oxidation resistance scale spallation high temperature

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Directionality based fast fractional pel motion estimation for H.264

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Journal of Systems Engineering and Electronics 2009年第3期20卷 457-462页

作者： Zhang Wei Fan fen wang Xiaoyang Zhu Weile School of Electronic Engineering Univ. of Electronic Science and Technology of China Chengdu 610054 P. R. China

Motion estimation is an important and intensive task in video coding applications. Since the complexity of integer pixel search has been greatly reduced by the numerous fast ME algorithm, the computation overhead required by fractional pixel ME has become relatively significant. To reduce the complexity of the fractional pixel ME algorithm, a directionality-based fractional pixel ME algorithm is proposed. The proposed algorithm efficiently explores the neighborhood positions which with high probability to be the best matching around the minimum one and skips over other unlikely ones. Thus, the proposed algorithm can complete the search by examining only 3 points on appropriate condition instead of 17 search points in the search algorithm of reference software. The simulation results show that the proposed algorithm successfully optimizes the fractional-pixel motion search on both half and quarter-pixel accuracy and improves the processing speed with low PSNR penalty.

关键词： fast encoding fractional pel motion search

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A Semiparametric Additive Rates Model for Clustered Recurrent Event Data

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Acta Mathematicae Applicatae Sinica 2013年第1期29卷 55-62页

作者： Sui He fen wang Liu-quan Sun School of Mathematics and Statistics Central China Normal University Institute of Applied Mathematics Academy of Mathematics and Systems Science Chinese Academy of Sciences

Recurrent event data often arises in biomedical studies, and individuals within a cluster might not be independent. We propose a semiparametric additive rates model for clustered recurrent event data, wherein the covariates are assumed to add to the unspecified baseline rate. For the inference on the model parameters, estimating equation approaches are developed, and both large and finite sample properties of the proposed estimators are established.

关键词： additive rates clustered failure time data estimating equation marginal model recurrentevents

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Effect of Bi promoter on the performances of selective oxidation of isobutane to methacrolein over MoVO/AlPO_4 catalysts

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Journal of Natural Gas Chemistry 2012年第2期21卷 165-169页

作者： Xitao wang Mei Li fen wang Shunhe Zhong Shi Jiang Sihe wang Tianjin Key Laboratory of Applied Catalysis Science and Technology College of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Nature Gas Company Dagang Oil FieldTianjin 300280China

The effects of Bi on the catalytic performance of selective oxidation of isobutane to methacrolein over MoVO/AlPO4 catalyst were investigated by XRD, FT-Raman, XPS, UV-vis DRS techniques. The results show that the addition of Bi component into the MoVO/AlPO4 catalyst obviously improves the catalytic performance, and the selectivity to methacrolein can increase from 14.2% to 45.1% with the increase of Bi/V molar ratio from 0 to 1. Combining the characterization results with the reaction evaluation, it is concluded that the catalytic activities of the MoV0.3Bix/AlPO4 catalysts are related to the crystalline phase composition and the dispersion of molybdenum and vanadium oxides species in general, and also to the V5＋/V4＋ molar ratio on the surface in particular.

关键词： sol-gel method selective oxidation of isobutene methacrolein MoVBiO/AlPO4 catalyst

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Complexation Induced by Weak Interaction between DNA and PEO-b-P4VP below the CMC of the Polymer

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Chinese Journal of Polymer Science 2017年第1期35卷 46-53页

作者： han miao ya-fen wang hai-yan dong 陈道勇 The State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200433 China

The complexation between circular DNA and individual chains of PEO-b-P4VP with a relatively long PEO block and a short P4VP block is highly controllable when the interaction between DNA and the polymer is weak enough. When one circular DNA chain is taken into consideration, and the polymer concentration is far below its critical micelle concentration （CMC）, polymer chains are absorbed by DNA chain due to the interaction between the negatively charged DNA chain and the slightly positively charged P4VP block chains. After the adsorption/complexation, the DNA chain is converted into a nanoring （type 1）. In the nanoring, the DNA chain is sufficiently wrapped by the polymer and adopts a fully stretched conformation, so that the DNA compact ratio in the nanorings is close to 1. When the polymer concentration is close to but lower than the CMC, the free polymer chains in the solution are adsorbed not only by the DNA chain but also by the polymer chains that have already been adsorbed on the DNA chain. As a result, the circular DNA chain adsorbs more polymer chains, and thus the resultant nanoring （type 2） has a larger width. In the type 2 nanoring, the DNA chain is slightly compressed; the DNA compact ratio is only about 2-3. Therefore, complexation induced by the weak interaction between DNA and PEO-b-P4VP below the CMC can produce narrow-disperse and large nanorings with a perimeter of micrometers, which are difficult to prepare by existing methods.

关键词： Weak interaction DNA Individual polymer chains Block copolymer Critical micelle concentration

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Role of cancer-associated fibroblasts in invasion and metastasis of gastric cancer

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World Journal of Gastroenterology 2015年第33期21卷 9717-9726页

作者： Yu Yan Li-feng wang Rui-fen wang Department of Pathology Xin Hua Hospital Affiliated to Shanghai Jiao Tong University School of Medicine

Cancer-associated fibroblasts(CAFs) are important components of various types of tumors,including gastric cancer(GC).During tumorigenesis and progression,CAFs play critical roles in tumor invasion and metastasis via a series of functions including extracellular matrix deposition,angiogenesis,metabolism reprogramming and ***,the mechanism of the interaction between gastric cancer cells and CAFs remains largely *** RNAs(mi RNAs) are a class of non-coding small RNA molecules,and their expression in CAFs not only regulates the expression of a number of target genes but also plays an essential role in the communication between tumor cells and *** this review,we provide an overview of recent studies on CAF mi RNAs in GC and the relevant signaling pathways in gastrointestinal *** the attention on these signaling pathways may help us better understand their role in tumor invasion and metastasis and identify new molecular targets for therapeutic strategies.

关键词： Cancer-associated fibroblasts Micro RNA Signaling

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