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High visible light photocatalytic activities obtained by integrating g-C_(3)N_(4) with ferroelectric PbTiO_(3)

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Journal of Materials Science & Technology 2021年第15期74卷 128-135页

作者： Tingting Xu ping niu Shulan Wang Li Li Department of Chemistry School of ScienceNortheastern UniversityShenyang110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang110819China

Graphitic carbon nitride(g-C_(3)N_(4))with the merits of high visible light absorption,proper electronic band structure with high conduction band edge and variable modulation,is viewed as a promising photocatalyst for practical *** alleviate its high recombination rate of photo-excited charge carriers and maximize the photocatalytic performances,it is paramount to design highly effective transfer channels for photo-excited charge *** materials can have the charge carriers transport in opposite directions owing to the internal spontaneous polarization,which may be suitable for constructing the heterostructure with g-C_(3)N_(4)for efficient charge *** by this concept,herein ferroelectric PbTiO_(3),which can be the visible-light absorber,is coupled with g-C_(3)N_(4)to construct PbTiO_(3)/g-C_(3)N_(4)heterostructure with close contact via Pb–N bond by the facile post thermal *** optimized Pb TiO_(3)/g-C_(3)N_(4)heterostructure exhibited excellent photocatalytic and photoelectrochemical activities under visible light ***,the simultaneous application of ultrasound-induced mechanical waves can further improve its photocatalytic activities through reinforcing the built-in piezoelectric *** work proposes a widely applicable strategy for the fabrication of high-performance ferroelectric based photocatalysts and also provides some new ideas for developing the understanding of ferroelectric photocatalysis.

关键词： Photocatalysis Ferroelectric Piezoelectric Carbon nitride Lead titanate

Hydrothermal Synthesis and Crystal Structure of a New 2D Layer Compound [{Ni(en)_2}_2Sb_8V_(14)O_(42)]·5.5H_2O

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Chemical Research in Chinese Universities 2009年第4期25卷 426-429页

作者： YU Li LIU Jiang-ping WANG Jing-ping niu Jing-yang Institute of Molecular and Crystal Engineering School of Chemistry and Chemical Engineering Ifenan University Kaifeng 475001 P. R. China

A new compound based on polyoxovanadate [{Ni（en）2}2Sb8V14O42]·5.5H2O（en=ethylenediamine）（1） was synthesised hydrothermally as black rhombus *** 1 crystallized in the monoclinic system with space group P21/n,Z=4,a=1.46953（9） nm,b=1.28623（8） nm,c=1.76008（11） nm,β=105.7230（10）°.In the asymmetric unit,cluster {Sb8V14O42} can be considered as an Sb derivative of the {V18O42} *** {Sb8V14O42} cluster as a building block interconnected to four other neighboring units by {Ni（en）2} bridging groups which are linked through the terminal oxygen atoms of the polyoxoanions,forming a two dimensional network.

关键词： Hydrothermal synthesis Antimony-substituted Polyoxovanadate

Constructing Crystalline g-C_(3)N_(4)/g-C_(3)N_(4-x)S_(x)Isotype Heterostructure for Efficient Photocatalytic and Piezocatalytic Performances

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Energy & Environmental Materials 2023年第2期6卷 8-16页

作者： Tingting Xu Zhonghui Xia Hongguan Li ping niu Shulan Wang Li Li Department of Chemistry School of ScienceNortheastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China

Graphitic carbon nitride(g-C_(3)N_(4))is viewed as a promising visible-light photocatalyst for industrialization due to its low processing temperature and high chemical ***,serious charge recombination caused by incomplete polymerization during direct calcination of nitrogen-rich precursors significantly limits its photocatalytic *** boost charge separation,herein,we propose a rational strategy by constructing a crystalline g-C_(3)N_(4)/g-C_(3)N_(4-x)S_(x) isotype heterostructure through the molten salt *** calculation reveals that apparent charge-transfer channels are formed between g-C_(3)N_(4) and S-doped g-C_(3)N_(4) layers in the *** to high crystallinity for decreasing charge recombination and isotype heterostructure for efficient charge transfer,the as-prepared g-C_(3)N_(4)/g-C_(3)N_(4-x)S_(x) showed remarkable photocatalytic performances with the hydrogen production rate elevated by up to 12.3 times of its singular *** novelty of this work is we investigated for the first time the piezocatalytic activity of crystalline g-C_(3)N_(4) by characterizing its performance for H2O2 generation and KMnO4 ***,its superior piezocatalytic performance over components can be further improved by NaBH4 treatment,which is uncovered to enhance the asymmetric structure of crystalline g-C_(3)N_(4) by introducing extra cyano groups and removing partial NHx species in its tri-s-triazine layer *** work opens up new strategies for the design of highly efficient polymeric photocatalysts and highlights the piezocatalytic studies of g-C_(3)N_(4).

关键词： carbon nitride high crystallinity isotype heterostructure photocatalysis piezoelectric catalysis

An Overview on Backscatter Communications

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Journal of Communications and Information Networks 2019年第2期4卷 1-14页

作者： Jin-ping niu Geoffrey Ye Li Shaanxi International Joint Research Centre for the Battery-Free Internet of Things School of Information and TechnologyNorthwest UniversityXi’anShaanxi 710127China School of Electrical and Computer Engineering Georgia Institute of TechnologyAtlantaGA30332USA

As a key low-power communication tech-nique,backscatter communications exploits the reflected or backscattered signals to transmit data,where the backscattered signals can be the reflection of ambient radio frequency(RF)signals,the RF signals from the dedicated carrier emitter or the signal photons in the non-classical quantum entangled pairs,*** the past 70 years,various kinds of backscatter communication systems have been developed,which will enable the low-power communications as required in the Internet of things(IoTs)and green *** article provides a historical view on the development and the research achievements on backscatter communications,including the fundamental principles,the applications,the challenges,and the potential research *** article will benefit the researchers and engineers concerning the area of backscatter communications,especially for applications in IoTs.

关键词： backscatter backscatter communications energy harvesting IoTs

Rational design of a hollow porous structure for enhancing diffusion kinetics of K ions in edge-nitrogen doped carbon nanorods

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Nano Research 2022年第9期15卷 8109-8117页

作者： ping niu Yang Yang Zhiqiang Li Gaohui Ding Lingzhi Wei Ge Yao Helin niu Yulin Min Fangcai Zheng Qianwang Chen Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid MaterialsAnhui UniversityMinistry of EducationHefei 230601China Hefei National Laboratory for Physical Science at Microscale and Department of Materials Science&Engineering University of Science and Technology of ChinaHefei 230026China Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province Anhui UniversityHefei 230601China Shanghai Key Laboratory of Materials Protection and Advanced Materials Electric Power Shanghai Engineering Research Center of Energy-Saving in Heat Exchange SystemsShanghai University of Electric PowerShanghai 200090China

The high electrical conductivity makes it possible for one-dimensional(1D)carbon materials to be used as the promising anodes for potassium ion batteries(PIBs),however,the sluggish diffusion kinetics caused by large-sized potassium ions(K^(+))limits their practical applications in energy storage *** this work,hollow carbon nanorods were rationally designed as a case to verify the superiority of 1D hollow structure to improve the diffusion kinetics of K^(+).Simultaneously,edge-N(pyridinic-N and pyrrolic-N)atoms were also introduced into 1D hollow carbon structure,which can provide ample active sites and defects in graphitic lattices to adsorb K^(+),providing extra capacitive storage *** expected,the optimized edge-N doped hollow carbon nanorods(ENHCRs)exhibits a high reversible capacity of 544 mAh·g^(−1)at 0.1 A·g^(−1)after 200 *** at 5 A·g^(−1),it displays a long-term cycling stability with 255 mAh·g^(−1)over 10,000 *** electrochemical measurements confirm that the hollow structure is favorable to improve the transfer kinetics of K^(+)during *** the theoretical calculations demonstrate that edge-N doping can enhance the local electronegativity of graphitic lattices to adsorb much more K^(+),where edge-N doping synergizes with 1D hollow structure to achieve enhanced K^(+)-storage performances.

关键词： carbon materials edge-nitrogen hollow structure theoretical calculation batteries

Mechanism of fluidized chlorination reaction of Kenya natural rutile ore

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Rare Metals 2014年第4期33卷 485-492页

作者： Li-ping niu Pei-Yuan Ni Ting-An Zhang Guo-Zhi Lv Ai-ping Zhou Xi-bin Liang De-long Meng School of Materials and Metallurgy Key Laboratory for Ecological Utilization of Multimetallic Mineral (Ministry of Education)Northeastern University Department of Material Science and Engineering KTH-Royal Institute of TechnologySE-100 44 StockholmSweden Titanium Plant Jinchuan Group Company Limited

In this paper, the thermodynamics and kinetics of nature rutile carbochlorination in a fluidized-bed were investigated. The thermodynamic calculations of TiO2-C- C12 system show that when C is excess in the solid phase, titanium tetrachloride and carbon monoxide can exist sta- bly. At high temperature, the reaction with CO as the product is the dominant reaction. The appropriate reaction conditions are as follows： reaction temperature of 950 ℃, reaction time of 40 min, carbon ratio of 30 wt% of rutile, natural rutile particle size of -96 μm, petroleum coke size of -150 μm, and chlorine flow of 0.036 m3.h-1. Under the above conditions, the reaction conversion rate of TiO2 can reach about 95 %. This paper proposed a reaction rate model, and got a rutile chlorination rate formula, which is generally consistent with the experimental data. For the TiO2-C-C12 system, the reaction rate is dependent on the initial radius of rutile particle, density, and the partial pressures of C12. From 900 to 1,000 ℃, the apparent activation energy is 10.569 ***1-1, and the mass diffu- sion is found to be the main reaction-controlling step. The expression for the chlorine reaction rate in the C-C12 sys- tem is obtained, and it depends on the degree of reaction, the partial pressure of C12, and the size of rutile particle.

关键词： Natural rutile Gas-solid reaction Fluidized-bed Carbochlorination Particle

The novel coronavirus outbreak in Wuhan,China

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Global Health Research and Policy 2020年第1期5卷 377-379页

作者： Hengbo Zhu Li Wei ping niu Department of Pediatric Renmin Hospital of Wuhan universityWuhan 430060China

The novel coronavirus(2019-nCoV,or COVID-19)epidemic first broke out in Wuhan and has been spreading in whole China and the *** numbers of new infections and deaths in Wuhan are still increasing,which have posed major public health and governance concerns.A series of mandatory actions have been taken by the municipal and provincial governments supported by the central government,such as measures to restrict travels across cities,case detection and contact tracing,quarantine,guidance and information to the public,detection kit development,*** such as lacking effective drugs,insufficient hospital services and medical supplies,logistics,*** much alleviated with the solidarity of the whole *** pandemic will definitely be ended with the continuous efforts of both national and international multi-sectoral bodies.

关键词： Novel coronavirus 2019-nCoV COVID-19 Pneumonia Outbreak Wuhan Global health

Strong interface contact between NaYF_(4):Yb,Er and CdS promoting photocatalytic hydrogen evolution of NaYF_(4):Yb,Er/CdS composites

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Journal of Materials Science & Technology 2022年第7期102卷 1-1,2-7页

作者： Huaze Zhu Yongqiang Yang Yuyang Kang ping niu Xiangdong Kang Zhiqing Yang Hengqiang Ye Gang Liu Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China School of Metallurgy Northeastern UniversityShenyang 110819China Jihua Laboratory Foshan 528000China

To acquire efficient photocatalysts,it is necessary to make effective use of visible light/Near Infrared(NIR)light,which takes up a large percentage of *** upconversion materials with visible light active photocatalysts has attracted much attention in this *** interface contact between upcon-version material and photocatalyst has potential influence on the properties and thus the performance of the *** this work,NaYF_(4):Yb,Er/CdS composites of the upconversion material NaYF_(4):Yb,Er nanorods and CdS nanoparticles were synthesized by ion adsorption/precipitation process and were then annealed in an argon atmosphere at different temperatures to modulate the *** annealing pro-cess endows the crystal transformation of cubic CdS with low crystallinity to hexagonal CdS with high crystallinity and,importantly,good interface contact between NaYF_(4):Yb,Er and ***,the hy-drogen evolution activity greatly increases from 171 to 2539μmol h^(−1) g^(−1) under the light irradiation ofλ>400 nm,and from 0 to 19μmol h^(−1) g^(−1) under the light irradiation ofλ>600 *** work might provide a useful reference for the rational design of promising photocatalyst involving upconversion ma-terials.

关键词： NaYF_(4):Yb Er CdS Upconversion Photocatalytic Composite

Development of hybrid-type modified chitosan derivative nanoparticles for the intracellular delivery of midkine-siR NA in hepatocellular carcinoma cells

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Hepatobiliary & Pancreatic Diseases International 2015年第1期14卷 82-89页

作者： Jing Zhong Hui-Lian Huang Jing Li Fu-Chu Qian Li-Qin Li ping-ping niu Li-Cheng Dai Huzhou Key Laboratory of Molecular Medicine Huzhou Central Hospital

BACKGROUND： Hepatocellular carcinoma（HCC） is one of the most common cancers worldwide. Most of the patients with HCC lose the surgical opportunity at the time of diagno sis. Some novel therapeutic modalities, like gene therapy, are promising for the treatment of HCC. However, the success of gene therapy depends on two aspects： efficient gene materials and gene delivery vectors. The present study was to develop new chitosan-based nanoparticles for a midkine-si RNA（anti HCC gene drug） ***： The novel gene delivery vector（MixN CH） was syn thesized by hybrid-type modification of chitosan with 2-chloro ethylamine hydrochloride and N, N-dimethyl-2-chloroethylamine hydrochloride. The chemical structure of Mix NCH was char acterized by FT-IR and 1HNMR. The cytotoxicity of Mix NCH was determined by MTS assay. The gene condensation ability and size, zeta potential and morphology of Mix NCH/MK si RNA nanoparticles were measured. The in vitro transfection and gene knockdown efficiency of midkine by Mix NCH/MK si RNA nanoparticles was detected by q RT-PCR and Western blotting. Gene knockdown effect at the molecule level on the proliferation of Hep G2 in vitro was determined by MTS ***： Mix NCH was successfully acquired by aminoalkyl ation modification of chitosan. The Mix NCH could condense MK-siR NA well above the weight ratio of 3. The average size of Mix NCH/MK-si RNA nanoparticles was 100-200 nm, and thesurface charge was about ＋5 m V. Morphologically, Mix NCH/MK-si RNA nanoparticles were in regular spherical shape-with no aggregation. Regarding to the in vitro transfection of nanoparticles, the MixN CH/MK-siR NA nanoparticles reduced MK m RNA level to 14.03%±4.03%, which were comparable to Biotrans（8.94%±3.77%）. Mix NCH/MK-si RNA effectively inhibited the proliferation of Hep G2 in vitro.-CONCLUSION： Mix NCH/MK-si RNA nanoparticles could be effective for the treatment of hepatocellular carcinoma.

关键词： chitosan gene vector nanoparticles midkine siRNA hepatocellular carcinoma