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Preparation optimization of multilayer-structured SnO_2–Sb–Ce/Ti electrode for efficient electrocatalytic oxidation of tetracycline in water

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Chinese Journal of Chemical Engineering 2018年第12期26卷 2622-2627页

作者： Kun Yang Yuyu liu jiawen liu Jinli Qiao Institute of Sustainable Energy/College of Science Shanghai UniversityShanghai 200444China State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry College of Environmental Science and EngineeringDonghua UniversityShanghai 201620China ShanghaiJinyuan Senior High School Shanghai 200333China

In this study, electrodeposition and thermal decomposition were alternatively used for the fabrication of a series of novel multilayer-structured SnO_2–Sb–Ce/Ti(SSCT) electrodes, and their physiochemical and electrochemical properties were investigated for electrochemical oxidation of tetracycline(TC) in aqueous ***, after the SnO_2–Sb–Ce(SSC) composite was electrodeposited for 120 s on the titanium substrate in aqueous solution, the outer thermal coatings composed of SSC were synthesized by a hydrothermal *** influences of electrodeposition time(T_(ed)) and thermal decomposition time(Ttd) were investigated to obtain the optimum preparation. It was found that when increasing T_(ed)to a certain extent a longer lifetime of electrode can be achieved, which was attributed to a more solid interlayer structure. A notable SSCTT_(ed),Ttdelectrode,i.e., SSCT3,10, which was prepared through three times of 120 s' electrodeposition(T_(ed)= 3) and ten times of thermal decomposition(Ttd= 10) obtained the highest oxygen evolution potential 3.141 V vs. SCE. In this selected electrode, when 10 mg·L^(-1) initial TC concentration was added to this wastewater, the highest color removal efficiency and mineralization rate of TC were 72.4% and 41.6%, respectively, with an applied electricity density of 20 m A·cm^(-2) and treatment time of 1 h. These results presented here demonstrate that the combined application of electrodeposition and thermal decomposition is effective in realization of enhanced electrocatalytic oxidation activity.

关键词： Multilayer structured electrode Nano-hollow sphere Antibiotics Electro-oxidation

Hydration Behavior and Cementitious Properties of Calcium Carbonate-aluminate Minerals Composite

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 126-133页

作者：王冲周帅 ZOU Luyao liu jiawen ZHENG Yalin College of Materials Science and Engineering Chongqing UniversityChongqing 400045China China West Construction Group Co. Ltd.Chengdu 610015China

The purpose of this research is to investigate the hydration behavior and cementitious properties of the mixture of calcium carbonate and aluminate, and to explore whether it can be adopted as a new low-carbon cementitious material. The composite system of calcium carbonate and aluminate minerals is studied by measuring the component of hydration products, the hydration heat, setting time and compressive *** results prove that the composite system has certain cementitious properties and is feasible to prepare new low-carbon cement.

关键词： limestone hydrated calcium carboaluminate cementitious properties mechanical properties

Deep learning for fast channel estimation in millimeter-wave MIMO systems

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Journal of Systems Engineering and Electronics 2022年第6期33卷 1088-1095页

作者： LYU Siting LI Xiaohui FAN Tao liu jiawen SHI Mingli School of Telecommunication Engineering Xidian UniversityXi’an 710071China State Key Laboratory of Integrated Service Networks Xidian UniversityXi’an 710071China

Channel estimation has been considered as a key issue in the millimeter-wave(mmWave)massive multi-input multioutput(MIMO)communication systems,which becomes more challenging with a large number of *** this paper,we propose a deep learning(DL)-based fast channel estimation method for mmWave massive MIMO *** proposed method can directly and effectively estimate channel state information(CSI)from received data without performing pilot signals estimate in advance,which simplifies the estimation ***,we develop a convolutional neural network(CNN)-based channel estimation network for the case of dimensional mismatch of input and output data,subsequently denoted as channel(H)neural network(HNN).It can quickly estimate the channel information by learning the inherent characteristics of the received data and the relationship between the received data and the channel,while the dimension of the received data is much smaller than the channel *** results show that the proposed HNN can gain better channel estimation accuracy compared with existing schemes.

关键词： millimeter-wave(mmWave) channel estimation deep learning(DL) dimensional mismatch channel state information(CSI)

Colorimetric and Photothermal Dual-modal Visual Detection of Iodide Ion Based on G-Quadruplex-Hemin Cascade Signal Amplification

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Chemical Research in Chinese Universities 2024年第2期40卷 305-310页

作者： CHEN Yanyue liu Jiali liu jiawen HU Rong YANG Yunhui ZHANG Xiaobing College of Chemistry and Chemical Engineering Yunnan Normal UniversityKunming650500P.R.China Molecular Science and Biomedicine Laboratory State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringCollaborative Innovation Center for Molecular Engineering for TheronasticsHunan UniversityChangsha410082P.R.China

The insufficient internal resorption of iodide ions(I−)leads to thyroid disorders,such as goiter,hypothyroidism,and cretinism in *** this paper,a portable point-of-care testing(POCT)platform was developed for the dual-modal analysis of I^(−),seamlessly integrating both colorimetric and photothermal thermometer *** quantification of results was achieved using a standard thermometer or smartphone.G-Quadruplex/Hemin(G4/Hemin)is the DNAzyme with peroxidase-like *** catalytic efficacy of G-quadruplex structures can be enhanced with the help of I^(−),manifesting as multicolor transitions from colorless to green and then blue,and accompanied by the increase of temperature,which can be used for the quantitative detection of I^(−).Additionally,digital analysis according to the three-color channels(R/G/B)by a cellphone eliminated the requirement for intricate *** dual-modal method for portable I^(−)determination is cost-effectiveness,simplicity,remarkable sensitivity(0.5 nmol/L)and ***,it was applied to determining the concentration of I^(−)in spiked serum samples.

关键词： Dual-modal platform G-Quadruplex Iodide ion Point-of-care testing(POCT) Aptasensor

Influence of temperature on the microstructure of V_2O_5 film prepared by DC magnetron sputtering

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Rare Metals 2006年第z1期25卷 82-87页

作者： SU Qing PAN Xiaojun XIE Erqing WANG Yinyue QIU jiawen liu Xueqin Department of Physics Lanzhou University Lanzhou 730000 China Department of Physics Lanzhou University Lanzhou 730000 China Department of Physics Lanzhou University Lanzhou 730000 China Department of Physics Lanzhou University Lanzhou 730000 China Lanzhou Institute of Physics Lanzhou 730000 China Department of Physics Lanzhou University Lanzhou 730000 China Lanzhou Institute of Physics Lanzhou 730000 China

V2O5 films were prepared on silicon wafers by DC magnetron sputtering and post-annealing under various conditions. The influence of depositing and post-annealing temperatures on microstructure of V2O5 films was studied by XRD and Raman scattering measurements. The results reveal that sputtered V2O5 films show preferred growth orientation along (001) planes and the c-axis is perpendicular to the silicon substrate surface. It is interesting to find that both the V2O5 film deposited at temperature of 511 ℃ and the one annealed at 500 ℃ exhibit desirable layer-type structure of orthorhombic symmetry. Such layer-typed V2O5 films are promising candidates for cathodes of rechargeable lithium or magnesium thin-film batteries.

关键词： V2O5 films sputtering raman XRD microstructure

In vitro corrosion behavior of the extruded Mg–4Zn–1Mn alloy in different physiological solutions for biomedical applications

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Progress in Natural Science:Materials International 2023年第4期33卷 467-477页

作者： Yang Zheng He Tong jiawen liu Jia Lu Weirong Li Fangfei liu Ziyue Zhang Yan Li School of Aeronautics and Astronautics Tiangong University School of Mechanical Engineering Tiangong University Dongguan Eontec Co.Ltd. School of Materials Science and Engineering Beihang University

The extruded Mg–4Zn–1Mn alloy was prepared and its in vitro corrosion behavior in different physiological solutions of simulated body fluid(SBF), artificial saliva(AS) and artificial urine(AU) was investigated for biomedical applications. The microstructural characterization by optical microscope(OM), X-ray diffractometer(XRD), scanning electron microscopy(SEM) and energy dispersive X-ray spectrometer(EDS) showed that the alloy with an average grain size of approximate 20 μm was mainly composed of α-Mg matrix phase along with some MgZn2and α-Mn precipitates. The results of electrochemical corrosion and immersion corrosion tests revealed a distinct corrosion behavior for the alloy in different solutions with increasing immersion time. The corrosion morphologies were featured with flocculent precipitates in the SBF, flower-like clusters in the AS and columnar crystals in the AU. The alloy exhibited highest corrosion resistance and lowest corrosion rate in the AS compared with the SBF and the AU, which was attributed to the formation of a stable corrosion products layer.

关键词： Biodegradable metals Mg–4Zn–1Mn alloy Physiological solutions Corrosion behavior

Application of Biochar on the runoff purification performance of porous asphalt pavement

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Transportation Safety and Environment 2021年第4期3卷 115-124页

作者： jiawen liu Hui Li John Harvey Hengji Zhang Yu Tian Key Laboratory of Road and Traffic Engineering of the Ministry of Education College of Transportation EngineeringTongji University4800 Cao’an RdShanghai 201804China Pavement Research Center Department of Civil and Environmental EngineeringUniversity of CaliforniaDavisCA 95616USA Shanxi Yellow River Frontier Materials Research Institute Co. Ltd.Taiyuan 030000China

Biochar is currently applied in many low-impact development measures,such as biofilters and filter ***,its application in permeable pavement is *** to the wide range of raw material sources,biochar may also contain nutrients and heavy *** its leachate will cause contamination during application remains *** on the static leachate contamination test,this study first evaluated the leachate contamination risks of three types of biochar and porous asphalt mixture(PA)with three biochar *** the pavement infiltration test,the purification performance of PA with biochar fillers and filter layers was further *** results show that biochar contains nitrogen and phosphorus,and the leaching contamination of coconut shell is the most obvious;when the biochar is applied as a filler in PA,the leaching contamination decreases,while the pollutant purification performance is not obvious;when 3−5 mm rice straw biochar is used as a filter layer,the removal rate of total suspended solids can be 100%,but it is accompanied by more serious nitrogen and phosphorus leaching,and the greater the thickness,the more serious the degree of *** water cleaning can remove the phosphates contained in biochar,but have little effect on ***,before the application of biochar,cleaning measures should be taken to minimize its leaching contamination.

关键词： urban runoff biochar porous asphalt mixture filter layer purification performance

Large SYBR Green I fluorescence enhancement for label-free aptamer-based detection of estradiol

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Advanced Agrochem

Advanced Agrochem 2023年第3期2卷 258-263页

作者： Xiaoqin Wang jiawen liu Chenqi Niu Juewen liu Department of Chemistry Waterloo Institute for NanotechnologyWater InstituteUniversity of WaterlooWaterlooOntarioN2L 3G1Canada

Estradiol(E2)and related estrogens are emerging environmental contaminants that may adversely affect the health of humans,animals,and *** aptamers have been reported for the detection of E2,and our lab recently selected a series of high-affinity and short DNA aptamers that showed various binding orientations to E2,leading to different selectivity *** this work,we report that using SYBR Green I(SGI)as a fluorescence probe,up to 200%fluorescence increase was achieved upon titration of E2 to these *** enhancement was the highest among all reported small molecule binding aptamers using SGI for signal generation,although some metal-binding DNA can achieve even higher *** gradually shortening the stem region of an E2 binding aptamer,we concluded that the enhanced fluorescence was from the aptamer binding pocket upon target binding instead of from the duplexed stem *** was also made with a few other aptamers including those for caffeine,quinine,uric acid and cortisol,and none of them showed more than 20%fluorescence *** the SGI method,the detection limit was calculated to be 2.4 nM *** attributed the large fluorescence enhancement to the hydrophobic nature of E2 and the high-affinity binding of the *** study provides insights into the aptamers that can use SGI for their binding assays and biosensor development.

关键词： Aptamers Label-free Fluorescence Biosensors Estradiol

Effects of water molecules on luminescence in europium and terbium coordination polymers with p-fluorobenzoic acid as ligand

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Journal of Rare Earths 2024年第7期42卷 1258-1264,I0003页

作者： Xiaoqi Zhao Puyan Hao Yami Ling Mengzhen Jia Rui Zhu jiawen liu Qiang Xu Jianhong Zhou Collaborative Innovation Center of Rare-Earth Optical Functional Materials and Devices Development Baoji Key Laboratory of Micro-Nano Optoelectronics and Terahertz TechnologySchool of Physics and Opto-Electronic TechnologyBaoji University of Arts and SciencesBaoji721016China

Our previous experimental observations show that the crystal structure of lanthanide luminescent complexes synthesized in aqueous solution usually contains a large number of coordination water molecules or free water *** order to probe the influence of water molecules on luminescent processes of lanthanide complexes,the photoluminescence properties of Ln-FBA(Ln=Eu and Tb,FBA=p-fluorobenzoic acid)coordination polymers at different ambient temperatures,in different solvents and aqueous DMSO solutions with different volume concentrations were systematically *** experiment results show that the presence of water molecules can promote the energy transfer from FBA ligand to Ln3+,at the same time,can cause luminescent non-radiation quenching of lanthanide *** addition,the variation of emission intensity ratio of 615 nm/591 nm peaks of Eu^(3+)with increasing the volume concentration of H_(2)O can be potentially used for the quantitatively detection of water traces in organic *** order to suppress the non-radiation quenching caused by the water molecules,Ln-FBA(Ln=Eu and Tb)coordination polymers were embedded into the PVP matrix to prepare Ln-FBA@PVP hybrid *** photoluminescence investigation indicates that PVP can not only block the quenching effect of water molecules on luminescence,but also effectively sensitize Eu^(3+)and Tb^(3+)*** experimental conclusions are useful for probing the influence of water molecules on luminescent processes of lanthanide complexes,quantitatively detecting water traces in organic solvents and enhancing the photoluminescence intensity in lanthanide complexes.

关键词： Lanthanide complexes Photoluminescence Luminescent quenching Rare earths