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Enhanced activity of ZnS(111) by N/Cu co-doping:Accelerated degradation of organic pollutants under visible light

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Journal of Environmental Sciences 2023年第3期125卷 244-257页

作者： Guofei Jiang Benjie Zhu Junzhi Sun Fang Liu Yongqiang Wang Chaocheng Zhao College of Chemical engineering China University of PetroleumQingdao 266580China State Key Laboratory of Petroleum Pollution Control Beijing 102206China State Key Laboratory of Heavy Oil Processing China University of PetroleumQingdao 266580China

High-efficiency photocatalysts are of great significance for the application of photocatalytic technology in water *** this study,N/Cu co-doped ZnS nanosphere photocatalys(N/Cu-ZnS) is synthesized by a hydrothermal method for the first *** doping,the tex ture of nanosphere becomes loose,the nanometer diameter is reduced,making the specific surface area of catalyst increased from 34.73 to 101.59 m^(2)/*** characterization results show that more ZnS (111) crystal planes are exposed by N/Cu co-doping;the calculations of density functional theory show that N/Cu co-doping can increase the catalytic activity of the ZnS (111) crystal plane,enhance the adsorption capacity of (111) crystal plane to O_(2)and promote the generation of·O_(2)-.The energy levels of the introduced impurities can be hybridized with the energy levels of S and Zn at the top of valence band and the bottom o conduction band,which makes the band gap narrower,thus enhancing the absorption o visible *** with pure ZnS,the degradation rates of 2,4-dichlorophenol (2,4-DCP and tetracycline (TC) by N/Cu-ZnS under visible light (>420 nm) are increased by 83.7 and51 times,*** this research,a promising photocatalyst for photocatalytic degra dation of organic pollutants in wastewater is provided.

关键词： Catalytic degradation of visible light N/Cu co-doping ZnS(111) 2,4-Dichlorophenol Tetracycline

Peptidomimetic-liganded gold nanoclusters for controlled iron delivery and synergistic suppression of tumor growth

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Nano Research 2023年第10期16卷 12066-12075页

作者： Xiqi Ma Duo Cai Zhixiong Zhang Qi Dai Xinyu Li Biao Yu Baosheng Ge Shihai Liu Xiaojuan Wang Fang Huang College of Chemical engineering State Key Laboratory of Heavy Oil ProcessingChina University of Petroleum(East China)Qingdao 266580China Medical Animal Laboratory Affiliated Hospital of Qingdao UniversityQingdao 266500China

A novel peptidomimetic-liganded gold nanocluster(CDp-AuNC)is proposed for the synergistic suppression of tumor *** advantages of the multi-capabilities offered by the surface ligands,including iron chelation,glutathione peroxidases-1(GPx-1)binding,and tumor cells recognition,CDp-AuNCs are able to function as the nanocarriers to deliver iron in a controlled manner for the ferroptosis therapy and as the inhibitors for GPx-1 to induce the apoptosis of tumor *** Fe2+@CDp-AuNC nanocomplexes are fabricated through a facile self-assembly *** experimental data verify that the nanocomplexes are internalized specifically by tumor cells with high *** acidic microenvironment in endosomes triggers the collapse of the nanocomplexes and thereby releases Fe2+to induce ferroptosis and CDp-AuNCs to inhibit the enzyme activity of *** from the H_(2)O_(2)-depleted pathway inhibition and ferroptosis acceleration,the intracellular reactive oxygen species(ROS)level could be enhanced *** a consequence,the apoptosis/ferroptosis of 4T1 cells as well as the tumor elimination in vivo are observed after treatment with the Fe2+@CDp-AuNC nanocomplexes at a relatively low *** facile iron loading method,simple construction procedure,and outstanding tumor suppression performance,provide CDp-AuNCs great application *** importantly,the strategy of peptidomimetic ligands design provides a transferable approach to building multifunctional nanomaterials.

关键词： self-assembly drug delivery ferroptosis peptidomimetics gold nanocluster

Simultaneous manipulations of thermal expansion and conductivity in symbiotic ScTaO_(4)/SmTaO_(4) composites via multiscale effects

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Journal of Advanced Ceramics 2023年第8期12卷 1625-1640页

作者： Lin Chen Jiankun Wang Baihui Li Keren Luo Jing Feng Faculty of Materials Science and engineering Kunming University of Science and TechnologyKunming 650093China

Effective manipulations of thermal expansion and conductivity are significant for improving operational performances of protective coatings,thermoelectric,and *** work uncovers determinant mechanisms of the thermal expansion and conductivity of symbiotic ScTaO_(4)/SmTaO_(4) composites as thermal/environmental barrier coatings(T/EBCs),and we consider the effects of interface stress and thermal *** weak bonding and interface stress among composite grains manipulate coefficient of thermal expansion(CTE)stretching from 6.4×10^(−6) to 10.7×10^(−6) K^(−1) at 1300℃,which gets close to that of substrates in T/EBC *** multiscale effects,including phonon scattering at the interface,mitigation of the phonon speed(vp),and lattice point defects,synergistically depress phonon thermal transports,and we estimate the proportions of different *** interface thermal resistance(R)reduces the thermal conductivity(k)by depressing phonon speed and scattering phonons because of different acoustic properties and weak bonding between symbiotic ScTaO_(4) and SmTaO_(4) ceramics in the *** study proves that CTE of tantalates can be artificially regulated to match those of different substrates to expand their applications,and the uncovered multiscale effects can be used to manipulate thermal transports of various materials.

关键词： thermal management coefficient of thermal expansion(CTE) interface thermal resistance(R) thermal stress(σ) thermal/environmental barrier coatings(T/EBCs)

Extend ethylene aromatization single-event kinetic modeling with physical and chemical descriptor based on ZSM-5 catalyst

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Petroleum Science 2023年第6期20卷 3841-3853页

作者： Jia-Rong Xie Fang Jin School of Chemical engineering and Pharmacy Wuhan Institute of TechnologyWuhan430205HubeiChina Key Laboratory for Green Chemical Process of Ministry of Education Wuhan Institute of TechnologyWuhan430205HubeiChina Novel Reactor&Green Chemical Technology Key Laboratory Wuhan Institute of TechnologyWuhan430205HubeiChina

The ethylene aromatization is critical for the methanol to aromatics and light alkane dehydroaromatization *** single-event microkinetic(SEMK)model combining the linear free energy theory and solid acid distribution concept were established and extend for the ethylene aromatization process,which can reduce the kinetic parameters and simplify the reaction network by comparison with the SEMK model including subtype elementary steps based on the type of carbenium *** introducing deactivation parametersφinto the model and applying the linear free energy model to the deactivation experimental data,the obtained deactivation parametersφindicate that the carbon deposition precursors have the greatest impact on reducing the reaction rate of single-molecular reactions and the smallest impact on the hydrogen transfer ***,according to the change of reaction enthalpy,effect of carbenium ion structure on methylation,ethylation,cyclization and endo-βscission was investigated by introducing linear free energy concept into the SEMK *** effect of different acid strengths on elementary steps was investigated based on the acid strength distribution model,it was found that the methylation and oligomerization reactions,the ali-βscission reaction,endo-βscission reaction and the cyclization reaction were more sensitive to strong acidity *** physisorption and chemisorption heat are separated from the protonation heat in the linear free energy kinetic model and the acid strength distribution kinetic model,and the absolute values of the obtained physisorption and chemisorption heat increase with the carbon number of carbenium ***,the parameters of the acid strength distribution kinetic model were applied to propane dehydroaromatization on H-ZSM-5 and the ethane dehydroaromatization on Zn/ZSM-5 to confirm the independence of parameters in the SEMK model with the similar reaction network.

关键词： Kinetic model Ethylene aromatization Acid strength distribution Linear free energy theory

Phase-plane analysis of conserved higher-order traffic flow model

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Applied Mathematics and Mechanics(English Edition) 2012年第12期33卷 1505-1512页

作者：吴春秀宋涛张鹏 S.C.WONG Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai Key Laboratory of Mechanics in Energy engineering Department of Civil engineering The University of Hong Kong

The phase-plane analysis is used to study the traveling wave solution of a recently proposed higher-order traffic flow model under the Lagrange coordinate system. The analysis identifies the types and stabilities of the equilibrium solutions, and the overall distribution structure of the nearby solutions is drawn in the phase plane for the further analysis and comparison. The analytical and numerical results are in agreement, and may help to explain the simulated phenomena, such as the stop-and-go wave and oscillation near a bottleneck. The findings demonstrate the model ability to describe the complexity of congested traffic.

关键词： traffic flow Lagrange coordinates phase-plane analysis traffic congestionpattern

A new model for predicting irreducible water saturation in tight gas reservoirs

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Petroleum Science 2020年第4期17卷 1087-1100页

作者： Yu-Liang Su Jin-Gang Fu Lei Li Wen-Dong Wang Atif Zafar Mian Zhang Wei-Ping Ouyang School of Petroleum engineering China University of Petroleum(East China)Qingdao 266580ShandongChina Department of Petroleum Technology University of KarachiKarachiPakistan Changqing Downhole Technology Company Chuanqing Drilling Engineering Co.LtdCNPCXi’an 710018ShaanxiChina

The irreducible water saturation(Swir) is a significant parameter for relative permeability prediction and initial hydrocarbon reserves ***,the complex pore structures of the tight rocks and multiple factors of the formation conditions make the parameter difficult to be accurately predicted by the conventional methods in tight gas *** this study,a new model was derived to calculate Swir based on the capillary model and the fractal *** model incorporated different types of immobile water and considered the stress *** dead or stationary water(DSW) was considered in this model,which described the phenomena of water trapped in the dead-end pores due to detour flow and complex pore *** water film,stress effect and formation temperature were also considered in the proposed *** results calculated by the proposed model are in a good agreement with the experimental *** proves that for tight sandstone gas reservoirs the Swir calculated from the new model is more *** irreducible water saturation calculated from the new model reveals that Swir is controlled by the critical capillary radius,DSW coefficient,effective stress and formation temperature.

关键词： Fractal theory Stress dependence effect Capillary model Tight sandstone gas reservoir Irreducible water saturation

Inclusions in large diamond single crystals at different temperatures of synthesis

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Chinese Physics B 2019年第2期28卷 439-444页

作者： Fei Han Shang-Sheng Li Xue-Fei Jia Wei-Qin Chen Tai-Chao Su Mei-Hua Hu Kun-Peng Yu Jian-Kang Wang Yu-Min Wu Hong-An Ma Xiao-Peng Jia School of Materials Science and engineering Henan Polytechnic UniversityCultivating Base for Key Laboratory of Environment-friendly Inorganic Materials in University of Henan Province State Key Laboratory of Superhard Materials Jilin University

The inclusions in large diamond single crystals have effects on its ultimate performance, which restricts its industrial applications to a great extent. Therefore, it is necessary to study the inclusions systematically. In this paper, large diamond single crystals with different content values of inclusions are synthesized along the(100) surface by the temperature gradient method(TGM) under 5.6 GPa at different temperatures. With the synthetic temperature changing from 1200?C to 1270?C,the shapes of diamonds change from plate to low tower, to high tower, even to steeple. From the microscopic photographs of the diamond samples, it can be observed that with the shapes of the samples changing at different temperatures, the content values of inclusions in diamonds become zero, a little, much and most, correspondingly. Consequently, with the temperature growing from low to high, the content values of inclusions in crystals increase. The origin of inclusions is explained by the difference in growth rate between diamond crystal and its surface. The content values of inclusions in diamond samples are quantitatively calculated by testing the densities of diamond samples. And the composition and inclusion content are analyzed by energy dispersive spectroscopy(EDS) and x-ray diffraction(XRD). From contrasting scanning electron microscopy(SEM) photographs, it can be found that the more the inclusions in diamond, the more imperfect the diamond surface is.

关键词： inclusions large diamond single crystals high pressure and high temperature

Degradation of metoprolol by UV/sulfite as an advanced oxidation or reduction process:The significant role of oxygen

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Journal of Environmental Sciences 2023年第6期128卷 107-116页

作者： Ying Cao Juan Li Yanxin Zhao Yumeng Zhao Wei Qiu Suyan Pang Jin Jiang Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal University at ZhuhaiZhuhai 519087China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Key Laboratory of Songliao Aquatic Environment Ministry of EducationSchool of Municipal and Environmental EngineeringJilin Jianzhu UniversityChangchun 130118China Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou 510006China Southern Marine Science and engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China

The degradation of metoprolol(MTP)by the UV/sulfite with oxygen as an advanced reduction process(ARP)and that without oxygen as an advanced oxidation process(AOP)was comparatively studied *** degradation of MTP by both processes followed the first-order rate law with comparable reaction rate constants of 1.50×10^(-3)sec^(−1)and 1.20×10^(-3)sec^(−1),*** experiments demonstrated that both e^(−)_(aq)and H·played a crucial role in MTP degradation by the UV/sulfite as an ARP,while SO_(4)^(·−)was the dominant oxidant in the UV/sulfite *** degradation kinetics of MTP by the UV/sulfite as an ARP and AOP shared a similar pH dependence with a minimum rate obtained around pH *** results could be well explained by the pH impacts on the MTP speciation and sulfite *** six transformation products(TPs)were identified from MTP degradation by the UV/sulfite ARP,and two additional ones were detected in the UV/sulfite *** benzene ring and ether groups of MTP were proposed as the major reactive sites for both processes based on molecular orbital calculations by density functional theory(DFT).The similar degradation products of MTP by the UV/sulfite process as an ARP and AOP indicated that e^(−)_(aq)/H·and SO_(4)^(·−)might share similar reaction mechanisms,primarily including hydroxylation,dealkylation,and H *** toxicity of MTP solution treated by the UV/sulfite AOP was calculated to be higher than that in the ARP by the Ecological Struc-ture Activity Relationships(ECOSAR)software,due to the accumulation of TPs with higher toxicity.

关键词： UV/sulfite Advanced reduction process(ARP) Advanced oxidation process(AOP) Metoprolol Degradation products Toxicity

Research on the Optimization and Simulation of the Shortest Path Based on Algorithm of Dijkstra

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Journal of Measurement Science and Instrumentation 2010年第S1期1卷 199-201,37页

作者： Chuan-xiang REN,Xin-gang HAO,Ying-rui WANG, Guang-hui PAN (College of Information and Electrical engineering,Shandong University of Science and Technology,Qingdao 266510,China)

Dijkstra algorithm is a theoretical basis to solve transportation network problems of the shortest path, which has a wide range of application in path optimization. Through analyzing traditional Dijkstra algorithm,on account of the insufficiency of this algorithm in path optimization,this paper uses adjacency list and circular linked list with combination to store date,and through the improved quick sorting algorithm for weight sorting, accomplish a quick search to the adjacent node,and so an improved Dijkstra algorithm is *** apply it to the optimal path search,and make simulation analysis for this algorithm through the example,also verify the effectiveness of the proposed algorithm.

关键词： route optimization Dijkstra algorithm fast sorting algorithm adjacency list and circular linked list