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Catalytic degradation of organic pollutants for water remediation over Ag nanoparticles immobilized on amine-functionalized metalorganic frameworks

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Nano Research 2022年第9期15卷 7887-7895页

作者： Wen-zhe xiao Ling-Ping xiao Yue-Qin Yang Shang-Ru Zhai Run-Cang Sun Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefineryCollege of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China

Developing efficient catalysts for organic pollutants degradation is crucial for remediating the current severe water environment,yet remains a great ***,we report silver nanoparticles immobilized on an amine-functionalized metal-organic framework(MOFs)(Ag/UiO-66-NH_(2))as a robust catalyst for the reduction of 4-nitrophenol(4-NP).The fabricated Ag/UiO-66-NH_(2)catalyst exhibits the merits of superior activities(high turnover frequency(TOF)3.2×10^(4)h^(-1)and k value 6.9×10^(-2)s^(-1)),costeffectiveness under the lowest NaBH4 concentration(n[NaBH_(4)]/n[4-NP],200),outstanding cyclability(10 recycling runs),and observable long-term durability,significantly outperforming previously reported catalytic *** excellent degradation efficiency is ascribed to the favorable microenvironment modulation of unique MOF structure,which regulates the intrinsic properties of active sites and improves the electron-transfer ***,the Ag/UiO-66-NH_(2)also promotes the catalytic degradation of several organic pollutants at room temperature and hence could find a broad application for water *** work offers a new avenue for the development of high-performance MOF-based catalysts with excellent activity and durability.

关键词： Ag/UiO-66-NH_(2) catalytic degradation organic pollutants 4-nitrophenol water remediation

Construction of OVA-stabilized fluorescent gold nanoclusters for sensing glucose

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Science China Chemistry 2015年第9期58卷 1508-1514页

作者： Lu-Liang Wang Juan Qiao Li Qi xiao-zhe Xu Dan Li Department of Chemistry and Research Institute for Biomedical and Advanced Materials Shantou University Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Analytical Chemistry for Living BiosystemsInstitute of Chemistry Chinese Academy of Sciences College of Chemistry Tianjin Normal University

Protein protected gold nanoclusters have outstanding physical and chemical properties that make them excellent scaffolds for the construction of novel chemical and biological probes. In this study, a simple one-pot synthesis method was proposed for the preparation of fluorescent probes based on ovalbumin-stabilized gold nanoclusters. This strategy allowed the generation of water-soluble gold nanoclusters within 5 min. The as-prepared fluorescent probe exhibited a red fluorescence emission at 625 nm, and good thermostability. The fluorescent probe was applied to measure glucose concentrations based on the hydrogen peroxide-induced fluorescence quenching principle, and showed favorable biocompatibility, high sensitivity and good selectivity. As a result of the advantageous properties and performance of this fluorescent probe, the present assay allowed for the selective determination of glucose in the range of 5.0×10-6 to 10.0×10-3 mol/L with a detection limit of 1.0×10?6 mol/L. Moreover, the glucose content in urinary samples was analyzed using the constructed fluorescent probe: this indicated the potential of the fluorescent gold nanoclusters for applications in biological and clinical diagnosis and therapy.

关键词： AuNCs Ovalbumin GOx glucose fluorescence

Temperature effect on the kinetics of persulfate oxidation of p-chloroaniline

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Chinese Chemical Letters 2011年第3期22卷 358-361页

作者： Yong Qing Zhang xiao zhe Du Wei Lin Huang College of Environmental Science and Engineering South China University of Technology Guangzhou 510006 China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of Education Guangzhou 510006 China Department of Environmental Sciences Rutgers. The State University of New Jersey New Brunswick NJ 08901 USA

The kinetics of heat-facilitated persulfate oxidation of p-chloroaniline（PCA） in aqueous solutions was measured at five different temperature conditions and at four different oxidant *** PCA degradation was found to follow a pseudo-first-order decay model when the persulfate was *** pseudo-first-order rate constants of PCA degradation by persulfate（50 mmol/ L） at pH 7.0 are 0.12×10^-4,0.28×10^-4,0.43×10^-4,0.83×10^-4,1.32×10^-4 s^-1 at 10,20,30,40 and 50℃,respectively. Under the above reaction conditions,the reaction has activation energy of 49.97 kJ/*** observed rate was found to be function of temperature and oxidant *** temperature and increasing persulfate concentration can significantly accelerate the PCA degradation.

关键词： Persulfate p-Chloroaniline Kinetics In situ chemical oxidation Temperature

Vertical Price Transmission in the China's Layer Industry Chain:an Application of FDL Approach

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Agricultural Sciences in China 2011年第11期10卷 1812-1823页

作者： XU Shi-wei DONG xiao-xia LI zhe-min LI Gan-qiong Key Laboratory of Digital Agricultural Early-Warning Technology Ministry of Agriculture~Agricultural Information Institute ChineseAcademy of Agricultural Sciences Beijing 100081 P.R.China

This paper examines the vertical price relationship between upstream and downstream products in China＇s layer industry chain by estimating elasticity coefficients of the price transmission. We use cointegration tests, error correction models and finite distributed lag models to analyze vertical price shifts between corn, layer feed, egg-laying chicken and egg prices. With monthly data from 1994 to 2010, our results show that various prices in China＇s layer industry chain are well integrated. In addition, our results indicate that both long-run and short-run price relationships between upstream and downstream products in layer industry chain exist and the long-run equilibrium, to a certain extent, may eliminate the short-run dynamics price deviation. We also found that the influence of corn and feed prices on egg prices is still more remarkable than egg-laying chicken prices. Our findings imply that governments should pay more attention to corn and layer feed prices in order to stabilize egg prices under the conditions of market integration.

关键词： finite distributed lag model vertical price transmission layer industry chain China

Study on the Interaction between Strychnine and Bovine Serum Albumin by Capillary Electrophoretic Frontal Analysis

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Chinese Chemical Letters 2005年第9期16卷 1233-1236页

作者： Shao Ping FU xiao zhe ZHANG Feng ZHANG Qing XU Hong Bin xiao Xin Miao LIANG Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023

The protein binding constant, binding sites of the Strychnos alkaloid-strychnine and bovine serum albumin （BSA） was determined by capillary electrophoretic frontal analysis （CE-FA） for the first time. The experiment was carried out in a polyacrylamide-coated fused silica capillary （48.4 cm×50 μm i.d., 38.1 cm effective length） with 20 mmol/L citrate/MES buffer （pH 6.0, ionic strength 0.17）. The applied voltage was 12 kV and detection wavelength was set at 257 nm. The plateau height of the peak was employed to determine the unbound concentration of drug in BSA equilibrated sample solution based on the external drug standard in the absence of protein. The present method provides a convenient, accurate technique for the early stage of drug screening.

关键词： Strychnine binding constant capillary electrophoretic frontal analysis bovine serumalbumin

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Environmental Science and Ecotechnology 2020年第2期2卷 1-8页

作者： xiaochuang Li Shouliang Huo Jingtian Zhang zhe xiao Beidou Xi Renhui Li State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing100012PR China Key Laboratory of Algal Biology Institute of HydrobiologyChinese Academy of SciencesWuhanHubei430072PR China

In recent years,Cylindrospermopsis raciborskii blooms have been widely found *** dealing with the mitigation of *** bloom is of great importance for toxins produced could threaten public *** paper first investigated *** dynamics over three years following sediment dredging in a shallow eutrophic Lake Dongqian(China).Based on rpoC1 gene copies,*** bloom formed with average density of 1.30×10^(6) cells/L on July *** year later after sediment dredging,*** cell density decreased below 1.17×10^(5) cells/L or under detected limits during summer days on *** two years later,the *** bloom period was returned with markedly increased cell density reaching up to 4.15×10^(7) cells/L on October 2011,and the maximum peak density was shown at 20.3C that was much lower than reported optimal growth *** from Spearman correlation analysis,linear regression showed *** density was significant and positive with pH and SD,whereas they were significant and negative with TP and *** regression analysis further demonstrated that TN,TP,SRP,pH and DO provided the best model and explained 53.1% of the variance in *** *** approaches managing nutrients reduction might not control *** bloom as extremely low TN(avg.0.18 mg/L)and TP concentrations(avg.0.05 mg/L)resulted in the highest *** cell density after sediment dredging.

关键词： Bloom control Cylindrospermopsis Environmental variables Sediment dredging

On UAV Serving Node Deployment for Temporary Coverage in Forest Environment:A Hierarchical Deep Reinforcement Learning Approach

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Chinese Journal of Electronics 2023年第4期32卷 760-772页

作者： WANG Li WU Xuewei WANG Yanhui xiao zhe LI Liang FEI Aiguo School of Computer Science (National Pilot Software Engineering School) Beijing University of Posts and Telecommunications School of Electronic Engineering Beijing University of Posts and Telecommunications

Unmanned aerial vehicles(UAVs) can be effectively used as serving stations in emergency communications because of their free movements, strong flexibility, and dynamic coverage. In this paper, we propose a coordinated multiple points based UAV deployment framework to improve system average ergodic rate, by using the fuzzy C-means algorithm to cluster the ground users and considering exclusive forest channel models for the two cases, i.e., associated with a broken base station or an available base station. In addition, we derive the upper bound of the average ergodic rate to reduce computational complexity. Since deep reinforcement learning(DRL) can deal with the complex forest environment while the large action and state space of UAVs leads to slow convergence, we use a ratio cut method to divide UAVs into groups and propose a hierarchical clustering DRL(HC-DRL) approach with quick convergence to optimize the UAV deployment. Simulation results show that the proposed framework can effectively reduce the complexity, and outperforms the counterparts in accelerating the convergence speed.

关键词： Deep learning Base stations Simulation Clustering algorithms Forestry Reinforcement learning Autonomous aerial vehicles

Fast nuclide identification based on a sequential Bayesian method

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Nuclear Science and Techniques 2021年第12期32卷 116-127页

作者： xiao-zhe Li Qing-Xian Zhang He-Yi Tan Zhi-Qiang Cheng Liang-Quan Ge Guo-Qiang Zeng Wan-Chang Lai Chengdu University of Technology The College of Nuclear Technology and Automation EngineeringChengdu 610059China

The rapid identification of radioactive substances in public areas is ***,traditional nuclide identification methods only consider information regarding the full energy peaks of the gamma-ray spectrum and require long recording times,which lead to long response *** this paper,a novel identification method using the event mode sequence(EMS)information of target radionuclides is *** EMS of a target radionuclide and natural background radiation were established as two different probabilistic models and a decision function based on Bayesian inference and sequential testing was *** proposed detection scheme individually processes each *** a photon is detected and accepted,the corresponding posterior probability distribution parameters are estimated using Bayesian inference and the decision function is ***,value of the decision function is compared to preset detection thresholds to obtain a detection ***ments on different target radionuclides(137Cs and 60Co)were *** count rates of the regions of interest(ROI)in the backgrounds between[651,671],[1154,1186],and[1310,1350]keV were 2.35,5.14,and 0.57 CPS,*** experimental results demonstrate that the average detection time was 6.0 s for 60Co(with an activity of 80400 Bq)at a distance of 60 cm from the *** average detection time was 7 s for 137Cs(with an activity of 131000 Bq)at a distance of 90 cm from the *** results demonstrate that the proposed method can detect radioactive substances with low activity.

关键词： Natural radiation Nuclide identification Sequential testing Nuclear safety

Application progress of rare earth nano-materials(continued)

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China Rare Earth Information 2009年第2期15卷 1-2页

作者： xiao zhe

*** polishing powders RE polishing powders occupy 14%of total RE consumption. Cerium-based polishing powders are widely used in precise polishing for optical lens,LCD screen,silicon single-crystal wafer and other elec... 详细信息

关键词：中国稀土行业市场分析发展现状

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