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Graphene-like h-BN supported polyhedral NiS_(2)/NiS nanocrystals with excellent photocatalytic performance for removing rhodamine B and Cr(Ⅵ)

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Frontiers of Chemical Science and Engineering 2021年第6期15卷 1537-1549页

作者： Wei Wang Linlin Song Huoli Zhang Guanghui Zhang Jianliang Cao College of Chemistry and Chemical Engineering Henan Key Laboratory of Coal Green ConversionHenan Polytechnic UniversityJiaozuo454000China State collaborative innovation center of coal Work Safety and Clean-efficiency utilization Henan Polytechnic UniversityJiaozuo454000China

Human health is deteriorating due to the effluent containing heavy metal ions and organic ***,photoreduction of Cr(Ⅵ)to Cr(Ⅲ)and degradation of rhodamine B(RhB)using a novel photocatalyst is particularly *** this work,h-BN/NiS_(2)/NiS composites were prepared via a simple solvothermal method and a double Z-scheme heterojunction was constructed for efficiently removing RhB and Cr(Ⅵ).The 7 wt-%h-BN/NiS_(2)/NiS composites were characterized via a larger specific surface area(15.12 m^(2)·g^(−1)),stronger light absorption capacity,excellent chemical stability,and high yield of electrons and *** experimental result indicated that the photoreduction efficiency of the 7 wt-%h-BN/NiS_(2)/NiS photocatalyst achieved 98.5%for Cr(Ⅵ)after 120 min,which was about 3 times higher than that of NiS_(2)/NiS(34%).However,the removal rate of RhB by the 7 wt-%h-BN/NiS_(2)/NiS photocatalyst reached 80%.This is due to the double Z-scheme heterojunction formed between NiS_(2)/NiS and h-BN,which improved the charge separation efficiency and transmission ***,the influence of diverse photogenerated electron and hole scavengers upon the photoreduction of Cr(Ⅵ)was studied,the results indicated that graphene-like h-BN promoted transportation of photoinduced charges on the surface of the h-BN/NiS_(2)/NiS photocatalyst via the interfacial effects.

关键词： graphene-like h-BN h-BN/NiS_(2)/NiS composites photocatalysis Cr(Ⅵ)reduction degradation of RhB

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Motion characteristics and density separation of fine coal in an inflatable-inclined liquid-solid fluidized bed

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Particuology 2021年第5期19卷 299-307页

作者： Bo Lv Bobing Dong Xiaowei Deng Chaojun Fang College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo 454000China Henan Key Laboratory for Green and Efficient Mining&Comprehensive utilization of Mineral Resources Henan Polytechnic UniversityJiaozuo 454000China collaborative innovation center of coal Work Safety and Clean high Efficiency utilization Henan Polytechnic UniversityJiaozuo 454000China

To improve the adaptability of fluidized beds for fine coal separation,a new type of liquid-solid fluidized bed was constructed,i.e.,the inflatable-inclined liquid-solid fluidized bed(IILSFB).A combination of simulation analysis and separation experiments was used to analyze the fluidization characteristics and separation performance of the *** results showed that there was upflow and downflow in the fluidized *** upflow was mainly composed of water flow,followed by light and heavy particles;on the other hand,the downflow was caused by the backflow of heavy particles that settled at the inclined *** addition,the light particles that settled at the inclined section could return to the rising water flow under the action of secondary *** the water velocity,separation time,and secondary gas velocity increased,the comprehensive separation efficiency of fine coal in the fluidized bed improved,while the value decreased as the feed quantity *** also indicated the order of importance for these four factors,i.e.,water velocity,separation time,feed quantity,and secondary gas velocity,on ***,the comprehensive separation efficiency of 0.1-1 mm fine coal varied significantly with various factors,while that of∼0.1 mm and 1-3 mm fine coal was always at a low *** the latter case,the classification process of the size fraction was significantly better than the separation process in the fluidized *** optimal working conditions,an IILSFB was used to separate the fine coal(0.1-1 mm).The yield of clean coal was 37.95% with an ash content of 12.11%,and the possible error was 0.085 g/cm^(3),indicating that the IILSFB had good separation performance for 0.1-1 mm fine coal.

关键词： Inflatable-inclined liquid-solid fluidized bed Fine coal separation Fluidization Separation efficiency Secondary gas velocity Size fraction

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Synergistic effect of microwave irradiation and CaF2 on vanadium leaching

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International Journal of Minerals,Metallurgy and Materials 2017年第2期24卷 156-163页

作者： Jing-peng Wang Yi-min Zhang Jing Huang Tao Liu School of Resource and Environmental Engineering Wuhan University of Science and Technology Wuhan 430081 China Hubei Provincial Engineering Technology Research center of high Efficient Cleaning utilization for Shale Vanadium Resource Wuhan 430081 China Hubei Provincial collaborative innovation center for high Efficient utilization of Vanadium Resource Wuhan 430081 China

The effect and mechanism of microwave irradiation on vanadium leaching were studied via a comparison between microwave heating and conventional heating. The results show a synergistic effect of microwave irradiation and calcium fluoride （CaF2） on the vana- dium leaching efficiency. It is confirmed that the vanadium leaching process can be improved by microwave irradiation when CaF2 is present. The leaching rate of vanadium under microwave irradiation is increased by 8%-15% when 5wt% CaF2 is added; by contrast, in the absence of CaF2, the leaching rate is almost unaffected compared to that by conventional heating. Morphological analysis reveals that the particles are gradually eroded by acid under microwave irradiation, whereas some of the fine particles in samples subjected to conventional heating are tightly covered by a flocculent silicate product. Moreover, a large amount of A1 and V and a small amount of Si are dissolved from samples under microwave heating, as revealed by the elemental analysis of leachates. Fourier transform infrared spectroscopic analysis also indicates a higher mass transfer coefficient in the diffusion layer of the raw material by microwave irradiation. When CaF2 is present, the reaction energy barrier is lowered and the leaching process is controlled by the tightly covered product layer, resulting in a prominent effect of mi- crowave irradiation.

关键词： vanadium extraction leaching microwave irradiation calcium fluoride synergistic effects

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Tomography of the dynamic stress coefficient for stress wave prediction in sedimentary rock layer under the mining additional stress

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International Journal of Mining Science and Technology 2021年第4期31卷 653-663页

作者： Wenlong Shen Guocang Shi Yungang Wang Jianbiao Bai Ruifeng Zhang Xiangyu Wang Henan Key Laboratory for Green and Efficient Mining&Comprehensive utilization of Mineral Resources School of Energy Science and EngineeringHenan Polytechnic UniversityJiaozuo 454000China Key Laboratory of Deep coal Resource Mining Ministry of Education State Key Laboratory of Coal Resources and Safe MiningChina University of Mining and TechnologyXuzhou 221116China collaborative innovation center of coal Work Safety and Clean high Efficiency utilization Jiaozuo 454000China

In this study,the tomography of dynamic stress coefficient(TDSC)was established based on a mechanical model of stress wave propagation in bedding planes and a mathematical model of the stress wave attenuation in rock *** reliability of the TDSC was verified by a linear bedding plane model and field ***,the TDSC in the dynamic stress propagation of bedding planes increases with the following conditions:(1)the increase of the normal stiffness of the bedding plane,(2)the increase of the incident angle of the stress wave,(3)the decrease of the incident frequency of the stress wave,or(4)the growth of three ratios(the ratios of rock densities,elastic moduli,and the Poisson’s ratios)of rocks on either side of bedding *** additional stress weakens TDSC linearly and slowly during the stress wave propagation in bedding planes,and the weakening effect increases with the growth of the three ***,the TDSC decreases exponentially in the rock mass as propagation distance *** a field case,the TDSC decreases significantly as vertical and horizontal distances increase and its wave range increases as vertical distance increases in the sedimentary rock layers.

关键词： Tomography of the dynamic stress coefficient Stress wave attenuation Mining additional stress Sedimentary rock layer

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Characterization and comparison of organic functional groups effects on electrolyte performance for vanadium redox flow battery

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Frontiers of Chemical Science and Engineering 2023年第9期17卷 1221-1230页

作者： Ling Ge Tao Liu Yimin Zhang Hong Liu School of Resource and Environmental Engineering Wuhan University of Science and TechnologyWuhan430081China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources utilization and Pollution Control Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium ResourcesWuhan University of Science and TechnologyWuhan430081China collaborative innovation center of Strategic Vanadium Resources utilization Wuhan University of Science and TechnologyWuhan430081China Hubei Provincial Engineering Technology Research center of high Efficient Cleaning utilization for Shale Vanadium Resource Wuhan University of Science and TechnologyWuhan430081China

The vanadium redox flow battery with a safe and capacity-controllable large-scale energy storage system offers a new method for the *** this case,acetic acid,methane sulfonic acid,sulfonic acid,amino methane sulfonic acid,and taurine are used to overcome the low electrolyte energy density and stability limitations,as well as to investigate the effects of various organic functional groups on the vanadium redox flow *** compared to the pristine electrolyte(0.22 Ah,5.0 Wh·L^(−1),85.0%),the results show that taurine has the advantage of maintaining vanadium ion concentrations,discharge capacity(1.43 Ah),energy density(33.9 Wh·L^(−1)),and energy efficiency(90.5%)even after several *** acetic acid electrolyte is more conducive to the low-temperature stability of the V(II)electrolyte(177 h at−25℃)than pristine(82 h at−2℃).The−SO_(3)H group,specifically the coaction of the−NH_(2)and−SO_(3)H groups,improves electrolyte ***−NH_(2)and−COOH additive groups improved conductivity and electrochemical activity.

关键词： vanadium redox flow battery functional groups organic additives energy density stability

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Origin of Photocatalytic Activity of BiPO4： the First-principles Calculations

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Chinese Journal of Structural Chemistry 2017年第8期36卷 1299-1306页

作者：祝林马新国危阳楚亮王辉虎黄楚云 School of Science Hubei University of Technology Hubei collaborative innovation center for high-efficiency utilization of Solar Energy Hubei University of Technology School of Science Nanjing University of Posts and Telecommunications

Geometric and electronic structures of three polymorphs of BiPO4（m MBIP, n MBIP and HBIP） have been investigated by the first-principles calculations. The results show that PO4 tetrahedron in n MBIP is distorted most, and m MBIP possesses minimum effective mass of carriers in three polymorphs of BiPO4. Further, the leading role of inductive effect of dipole moment or effective mass of carries in the separation of electron-hole pairs is analyzed. Based on the fact that n MBIP has higher photocatalytic activity than m MBIP, it can be inferred that the inductive effect of dipole moment deriving from distorted PO4 tetrahedron is the dominant factor affecting the separation efficiency of carries. The calculated results represent that n MBIP has more appropriate redox potential and narrower band gap than others. These findings may provide meaningful guidance for further understanding on the relationship between unique crystal structure and photocatalytic activity of BiPO4.

关键词： BiPO4 photocatalysis the first-principles calculations

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Organic Cation Effect on the Physical Properties of CH3NH3PbI3 Perovskite from the First-principles Study

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Chinese Journal of Structural Chemistry 2016年第8期35卷 1297-1305页

作者：刘娜黄楚云祝林陈益徐国旺楚亮马新国 School of Science Hubei University of Technology Hubei collaborative innovation center for high-efficiency utilization of Solar Energy Hubei University of Technology School of Science Nanjing University of Posts and Telecommunications

The effect of the distribution of organic cations CH3NH3^＋（MA^＋） on the stability,electronic structures and optical properties of CH3NH3 Pb I3 perovskite have been investigated using the plane-wave ultrasoft pseuudopotentials. Generalized gradient approximation and local density approximation are used to optimize the geometries of six models, which are different in the orientation of organic cations. The results show that model C is more stable than others, and the main contribution to the top of valence band is from I 5p states. In the bottom of conduction bands, the main components are Pb 6s states with an overlapping of I 5p states. When the orientation of organic group is transforming, the Pb I6 octahedra will distort and the band structure will alter with it, which affect the generation and migration of photon-generated carriers and optical properties.

关键词： perovskite solar cell CH3NH3Pb I3 structure stability first-principles

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Linear and nonlinear characteristics of time-resolved photoluminescence modulation by terahertz pulse

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Chinese Physics B 2017年第10期26卷 1-6页

作者：龚姣丽刘劲松张曼褚政杨振刚王可嘉姚建铨 Wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and Technology Hubei collaborative innovation center for high-efficient utilization of Solar Energy School of ScienceHubei University of Technology

The linear and nonlinear characteristics of time-resolved photoluminescence （PL） of n-type bulk semiconductor GaAs modulated with terahertz （THz） pulse are studied by using an ensemble Monte Carlo （EMC） method. In this paper the center energy valley （Г valley） electron concentration changes with the pulse delay time, sampling time and the outfield are mainly discussed. The results show that the sampling time and the THz field should exceed certain thresholds to effectively excite photoluminescence quenching （PLQ）. Adopting a direct current （DC） field makes the sampling time threshold shortened and the linear range of THz field-modulation PL expanded. Moreover, controlling the sampling time and the outfield intensity can improve the linear quality： with forward time, the larger outfield is used; with backward time, the smaller outfield is used. This study can provide a theoretical basis of THz field linear modulation in a larger range for new light emitting devices.

关键词： THz pulse modulation photoluminescence ensemble Monte Carlo intervalley scattering

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First-principles study on the synergistic effects of codoped anatase TiO_2 photocatalysts codoped with N/Vor C/Cr

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Journal of Semiconductors 2014年第10期35卷 5-11页

作者：许文慧马新国吴桐贺之琦王辉虎黄楚云 School of Science Hubei University of Technology School of Mechanical Engineering Hubei University of Technology Hubei collaborative innovation center for high-Efficient utilization of Solar Energy Hubei University of Technology

An effective compensated codoping approach is described to modify the photoelectrochemical prop- erties of anatase TiO2 by doping with nonmetals （N or C） and transition metals （V or Cr） impurities. Here, com- pensated codoped TiO2 systems are constructed with different dopant species and sources, and then their dopant formation energies and electronic structures are performed to study the stability and visible-light photoactivity by first-principles plane-wave ultrasoft pseudopotential calculations, respectively. The calculated results demonstrate that the codoping with transition metals facilitates the enhancement of the concentration of p-type dopants （N and C） in a host lattice. Especially, compensated codoping not only reduces the energy gap, to enhance the optical ab sorption, and eliminate the local trapping, to improve carrier mobility and conversion efficiency, but it also keeps the oxidation-reduction potential of the conduction band edge. These results are conducive to the understanding of the synergistic mechanism of the photocatalytic activity of TiO2 that is enhanced by codoping.

关键词： first-principles photocatalysis TiO2 codoping

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Lateral abutment pressure distribution and evolution in wide pillars under the first mining effect

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International Journal of Mining Science and Technology 2023年第3期33卷 309-322页

作者： Zhen Zhang Zhen Li Gang Xu Xiaojin Gao Qianjin Liu Zhengjie Li Jiachen Liu coal Mining and Designing Branch China Coal Research InstituteBeijing 100013China CCTEG coal Mining Research Institute Beijing 100013China coal Mining&Designing Department Tiandi Science&Technology Co.Ltd.Beijing 100013China School of Civil Engineering Henan Polytechnic UniversityJiaozuo 454003China collaborative innovation center of coal Work Safety and Clean high Efficiency utilization Jiaozuo 454003China

The wide pillars are generally popular due to the high productivity and efficiency in Northwest *** distribution of lateral abutment pressure in coal pillars is important for mining *** reveal the effect of the first mining on the lateral abutment pressure distribution and evolution in wide pillars,an in-situ experiment,theoretical analysis and numerical simulation were ***,the field monitoring of lateral abutment pressure was conducted from the perspective of time and space in the Chahasu coal Mine,Huangling No.2 coal Mine and Lingdong coal Mine during the first *** on the field monitoring stress,a theoretical model was proposed to reveal the lateral abutment pressure *** methodology was demonstrated through a case *** at the distribution mechanism,a numerical experiment was conducted through the finite-discrete element method(FDEM).Last,field observations of borehole fractures were performed to further study the damage *** addition,two types of lateral abutment pressure evolution with mining advance were *** on the stress monitoring layout were proposed as *** results could provide foundations for strata control and disaster prevention in wide pillars in underground coal mines.

关键词： Wide pillar Lateral abutment pressure Pillar stress First mining effect Field monitoring

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