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A comparison of H^+-restacked nanosheets and nanoscrolls derived from K_4Nb_6O_(17) for visible-light degradation of dyes

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Journal of Energy Chemistry 2014年第2期23卷 136-144页

作者： Chenhui Hu Lihong Zhang Liyuan Cheng Jing Chen wenhua hou Weiping Ding Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringNanjing University School of Science Nanjing University of Technology

H＋-restacked nanosheets and nanoscrolls peeled from K4Nb6O17 display different structures and surface characters. The two restacked samples with increased surface areas have an amazing visible-light response for the photodegradation of dyes, which is superior to commercial TiO2 （P25） and Nb205. By comparison, H＋/nanosheets have a relatively faster photodegradation rate originated from large and smooth basal plane. The work reveals that dye adsorbed on the unfolded nanosheets can effectively harvest sunlight. Due to facile preparation, low-cost and high photocatalytic efficiency, H＋/nanosheets and H＋/nanoscrolls might be used for the visible light-driven degradation of organic dyes as a substitute for TiO2 in industry.

关键词： K4Nb6O17 nanosheets nanoscrolls photodegradation dye

Rational design of 3D porous niobium carbide MXene/rGO hybrid aerogels as promising anode for potassium-ion batteries with ultrahigh rate capability

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Nano Research 2023年第2期16卷 2463-2473页

作者： Cong Liu Zhitang Fang Xiaoge Li Jinhua Zhou Gang Yang Luming Peng Xuefeng Guo Weiping Ding wenhua hou Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China Suzhou Key Laboratory of Functional Ceramic Materials Changshu Institute of TechnologyChangshu 215500China

An effective method is designed to construct three-dimensional(3D)Nb_(2)C/reduced graphene oxide(rGO)hybrid aerogels through a low-temperature graphene oxide(GO)-assisted hydrothermal self-assembly followed by freeze-drying and *** intimately coupled Nb_(2)C/rGO hybrid aerogel combines the advantages of large specific surface area and rich 3D interconnected porous structure of aerogel as well as high conductivity and low potassium diffusion energy barrier of Nb_(2)C,which not only effectively prevents the self-restacking of Nb2C nanosheets to allow more active sites exposed and accommodate the volume change during the charge/discharge process,but also increases the accessibility of electrolyte and promotes the rapid transfer of ions/*** a result,Nb_(2)C/rGO-2 as the anode of potassium ion batteries(KIBs)delivers a large reversible specific capacity(301.7 mAh·g^(−1)after 500 cycles at 2.0 A·g^(−1)),an ultrahigh rate capability(155.5 mAh·g^(−1)at 20 A·g^(−1)),and an excellent long-term large-current cycle stability(198.8 mAh·g^(−1)after 1,000 cycles at 10 A·g^(−1),with a retention of 83.3%).Such a high-level electrochemical performance,especially the ultrahigh rate capability,is the best among transition metal carbides and nitride(MXene)-based materials reported so far for *** diffusion kinetics of K+is investigated thoroughly,and the synergetic charge–discharge mechanism and the structure–performance relationship of Nb_(2)C/rGO are revealed *** present work provides a good strategy to solve the self-restacking problem of two-dimensional materials and also enlarges the potential applications of MXenes.

关键词： niobium-based transition metal carbides(Nb_(2)C MXene) reduced graphene oxide(rGO) hybrid aerogel potassium ion batteries ultrahigh rate capability

Theoretical Analysis of the Application of Immobilized Cells to the Continuous Fermentation Process

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哈尔滨工业大学学报 1990年第3期22卷 112-120页

作者： hou wenhua Yue Qixian Zhou Ding (Department of Applied Chemistry)

This paper theoretically studies the continuous immobilized cell (IMC) fer mentation system. A kinetic model of IMC is established, and the relational expressions between production rate, substrate concentration, biomass concentration and dilution rate in the IMC continuous stirred tank reactor (CSTR) are derived. These equations and some numerical calculations show that as compared with the free cell system the IMC system has many advantages: high production rate, steady operation, and being independent of the dilution rote. They also indicate that the diffusion of substrate is a constraint to the production of metablite.

关键词：固相化细胞连续发酵过程生化工程生物反应器生物量浓度稀释率固相酶

Thermostable Nitrogen-Doped HTiNbO5 Nanosheets with a High Visible-Light Photocatalytic Activity

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Nano Research 2011年第7期4卷 635-647页

作者： Zheng Zhai Yucheng Huang Lin Xu Xiaoyan Yang Chenhui Hu Lihong Zhang Yining Fan wenhua hou Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering Nanjing University Nanjing210093 China

Nitrogen-doped HTiNbO5 nanosheets have been successfully synthesized by first exfoliating layered HTiNbO5 in tetrabutylammonium hydroxide （TBAOH） to obtain HTiNbO5 nanosheets and then heating the nanosheets with urea. The resulting samples were characterized by X-ray diffraction （XRD）, transmission electron microscopy （TEM）, scanning electron microscopy （SEM）, energy-dispersive X-ray （EDX）, X-ray photoelectron spectroscopy （XPS）, UV-vis spectroscopy and N2 adsorption-desorption measurements. It was found that N-doping resulted in a much higher thermostability of the layered structure, intrinsic bandgap narrowing and a visible light response. The doped nitrogen atoms were mainly located in the interstitial sites of TiNbOs- lamellae and chemically bound to hydrogen ions. Compared with N-doped HTiNbOs, N-doped HTiNbO5 nanosheets had a much larger specific surface area and richer mesoporosity due to fee rather loose and irregular arrangement of fitanoniobate nanosheets. Both N-doped layered HTiNbOs and HTiNbO5 nanosheets showed a very high visible-light photocatalytic activity for the degradation of rhodamine B （RhB） aqueous solution. Moreover, due to the considerably larger surface area, richer mesoporosity and stronger acidity, N-doped HTiNbO5 nanosheets had an even higher activity than N-doped HTiNbOs, although the latter had a stronger absorption in the visible region. The dye molecules were mainly degraded to aliphatic organic compounds and partially mineralized to CO2 and/or CO, rather than being simply decolorized. The effect of photosensitization was insignificant and RhB was degraded mainly via the typical photocatalytic reaction routes. Two different reaction routes for the photodegradation of RhB under visible light irradiation over N-doped HTiNbO5 nanosheets have been proposed. The present method can be extended to a large number of layered metal oxides that have the characteristics of intercalation and exfoliation, thus providing new opportunities for the f

关键词： Layered titanoniobate nanosheets N-doping photodegradation visible light

n-Pentylamine-intercalated layered perovskite-type oxide

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Chinese Science Bulletin 2001年第8期46卷 645-647页

作者： hou wenhua ZHONG Zhaohui DING Weiping CHEN Yi CHEN Xiaoyuan ZHU Yongyuan MIN Naiben School of Chemistry and Chemical Engineering Nanjing UniveristyNanjing 210093China National Laboratory of Solid State Microstructures Nanjing UniveristyNanjing 210093China

A novel n-pentylamine-intercalated layered perovskite-type oxide, C5H11NH3-Sr2Nb3O10, was prepared and characterized by using XRD, FT-IR, Raman spec-trascopy, and elemental analysis. It was shown that the intercalated n-pentylamine adopted a bilayer formation with some overlap and tilt, and the lattice of the perovskite layer was distorted due to the intercalation of n-pentylamine. The as-prepared sample gave clear electric hysteresis loop and did not show fatigue after 1011 switching circles, and therefore, could be considered as a new kind of fatigue-free ferroelectric materials.

关键词： layered perovskite-type oxides ferroelectricity fatigue- free.

Ultrahigh rate capability of 1D/2D polyaniline/titanium carbide(MXene)nanohybrid for advanced asymmetric supercapacitors

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Nano Research 2022年第1期15卷 285-295页

作者： Jinhua Zhou Qi Kang Shuchi Xu Xiaoge Li Cong Liu Lu Ni Ningna Chen Chunliang Lu Xizhang Wang Luming Peng Xuefeng Guo Weiping Ding wenhua hou Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Polymer Science and Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgingShanghai Jiao Tong UniversityShanghai 200240China Analytical Testing Center Yangzhou UniversityYangzhou 225009China

High energy density and enhanced rate capability are highly sought-after for supercapacitors in today's mobile *** this work,polyaniline/titanium carbide(MXene)(PANI/Ti3C2Tx)nanohybrid is synthesized through a facile and cost-effective self-assembly ***-dimensional(10)PANI nanofibers and two-dimensional(20)Ti3C2Tx ***!Ti3C2Tx delivers greatly improved specific capacitance,ultrahigh rate capability(67%capacitance retention from 1 to 100 A·g^(-1))as well as good cycle *** kinetic analysis reveals that PANI/Ti3C2Tx is featured with surface capacitance-dominated process and has a quasi-reversible kinetics at high scan rates,giving rise to an ultrahigh rate *** using PANl!Ti3C2Tx as positive electrode,an 1.8 V aqueous asymmetric supercapacitor(ASC)is successfully assembled,showing a maximum energy density of 50.8 Wh·kg^(-1)·(at 0.9 kW-kg-1)and a power density of 18 kW·kg^(-1)(at 26 Wh·kg^(-1)).Moreover,an 3.0 V organic ASC is also elaborately fabricated,·by using PANI/Ti3C2Tx,achieving an ultrahigh energy density of 67.2 Wh·kg^(-1)(at 1.5 kW·kg^(-1))and a power density of 30 kW·kg^(-1)·(at 26.8 Wh·kg^(-1)).The present work not only improves fundamental understanding of the structure-property relationship towards ultrahigh rate capability electrode materials,but also provides valuable guideline for the rational design of high-performance:energy storage devices with both high energy and power densities.

关键词： MXene polyaniline nanohybrid asymmetric supercapacitor rate capability

Enhancement of catalytic activity by homo-dispersing S_2O_8^(2–)-Fe_2O_3 nanoparticles on SBA-15 through ultrasonic adsorption

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Chinese Journal of Catalysis 2018年第5期39卷 955-963页

作者： Qingyan Chu Jing Chen wenhua hou Haoxuan Yu Ping Wang Rui Liu Guangliang Song Hongjun Zhu Pingping Zhao College of Chemistry and Molecular Engineering Nanjing Tech UniversityNanjing 211816JiangsuChina Research institute of QILU petrochemical company SINOPECZibo 255400ShandongChina Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023JiangsuChina School of Chemical Engineering Shandong University of TechnologyZibo 255049ShandongChina

Mesoporous superacids S2O82–-Fe2O3/SBA-15(SFS)with active nanoparticles are prepared by ultrasonic adsorption *** method is adopted to ensure a homo-dispersed nanoparticle active phase,large specific surface area and many acidic *** with bulk S2O82–-Fe2O3,Br?nsted acid catalysts and other reported catalysts,SFS with an Fe2O3 loading of 30%(SFS-30)exhibits an outstanding activity in the probe reaction of alcoholysis of styrene oxide by methanol with 100%***,SFS-30 also shows a more excellent catalytic performance than bulk S2O82–-Fe2O3 towards the alcoholysis of other ROHs(R=C2H5-C4H9).Lewis and Bronsted acid sites on the SFS-30 surfaces are confirmed by pyridine adsorbed infrared *** highly efficient catalytic activity of SFS-30 may be attributed to the synergistic effect from the nano-effect of S2O82–-Fe2O3 nanoparticles and the mesostructure of ***,SFS-30 shows a good catalytic reusability,providing an 84.1%yield after seven catalytic cycles.

关键词： Mesoporous superacid Nanoparticle Nano effect S2O82–-Fe2O3/SBA-15 Acidic site Ultrasonic adsorption Alcoholysis

The　Application　of　Spanning　Tree　Algorithm　in　Arabic　Language　Rules　for　Contextual　Analysis

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Systems Science and Systems Engineering 1996年第4期6卷 451-455页

作者： BIAN Fuping MENG Fanzhen hou wenhua(Department of Mathematics, Tianjin University, Tianjin 300072)

In this paper we deal with the application of spanning tree algorithm in Arabic language rules for contextual analysis. We define a special multiplication of a matrix and a vector, and construct a mathematical model of spelling rules for the different types of characters,Inseparates,Separates and Diacritics. We design the output algorithm in contextual analysis by the spanning tree structure.

关键词： Arabic language contextual analysis spanning tree node matrix

PREPARATION OF MESOPOROUS SILICA PILLARED LAYERED TITANONIOBATE WITH A HIGH INTERLAYER DISTANCE AND SPECIFIC SURFACE AREA

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南京大学学报(自然科学) 1999年第5期 631-633页

作者： Xu Lin hou wenhua Yan Qijie (Department of Chemistry,Nanjing University,210093, Nanjing, PRC)

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关键词： Mesoporous Layered titanoniobate Silica pillared Preparation