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Coextraction of vanadium and manganese from highmanganese containing vanadium wastewater by a solvent extraction-precipitation process

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Frontiers of Chemical Science and Engineering 2020年第5期14卷 902-912页

作者： Zishuai Liu Yimin Zhang Zilin dai jing Huang Cong Liu School of Resource and Environmental Engineering Wuhan University of Science and TechnologyWuhan 430081China Guangdong Research Institute of Rare-Metal Guangzhou 510650China State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control Wuhan University of Science and TechnologyWuhan 430081China Hubei Collaborative Innovation Center for High Efficient Utilization of Vanadium Resources Wuhan University of Science and TechnologyWuhan 430081China Hubei Provincial Engincering Technology Research Center of High Eficient Cleaning Uilization for Shale Vanadium Resources Wuhan University of Science and TechnologyWuhan 430081China

High-manganese containing vanadium waste-water(HMVW)is commonly produced during the vanadium extraction process from vanadium *** cannot be reused and discharged directly,and is harmful to the environment and affect product quality due to heavy metals in the *** wastewater is usually treated by lime neutralization,but valuable metals(especially V and Mn)cannot be *** this study,an efficient and environmentally friendly method was developed to recover valuable metals by using a solvent extraction-precipitation *** the solvent extraction process,98.15%of vanadium was recovered,and the V2Os product,with a purity of 98.60%,was obtained under optimal *** the precipitation process,91.05%of manganese was recovered as MnCO3 which meets the III grade standard of HG/T *** simulation analysis indicated that MnCO3 was selectively precipitated at pH 6.5 while Mg and Ca could hardly be *** results of X-ray diffraction and scanning electron microscopy demonstrated that the obtained V2Os and MnCO3 displayed a good degree of *** treated wastewater can be returned for leaching,and resources(V and Mn)in the wastewater were utilized efficiently in an environmentally friendly ***,this study provides a novel method for the coextraction of V and Mn from HMVW.

关键词： high-manganese containing vanadium waste-water solvent extraction carbonate precipitation vanadium titano-magnetite valuable metal recovery

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Transit cost effectively to a secure decarbonized energy system

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iEnergy 2023年第2期2卷 89-90页

作者： Qingyu Xu jing dai Energy Internet Research Institute Tsinghua UniversityBeijing 100085China

Numerous countries worldwide have committed to the decarbonization of their *** countries include both developed nations such as the United States,United Kingdom,and European Union member states,as well as recently developed nations like China.A commonly adopted strategy among these countries involves initiating the decar-bonization process within the power *** adoption is pri-marily motivated by two factors:first,the existence of well-estab-lished low-carbon power supply technologies,such as wind and solar PV second,the potential for extensive electrification of fossil fuel energy demand through rapidly advancing technologies,such as electric vehicles and heat ***,decarbonizing the power sector represents the most logical starting point in the jour-ney toward a low-carbon future.

关键词： starting initiating system

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Solvent Effects on Two-Photon Absorption of Alkyne and Alkene π-bridging Chromophores

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Chinese Journal of Chemical Physics 2017年第1期30卷 63-70,I0001页

作者： jing Li chuan-kui Wang Yu-zhi Song College of Physics and Engineering Qufu Normal University Qufu 273165 China School of Physics and Electronics 5handong Normal University ginan 250014 China

The present work concerns the study of solvent effects on the geometrical structures, as well as one- and two-photon absorption （TPA） processes, for two series of alkyne and alkene π-bridging molecules, within the framework of the polarization continuum model. Particular emphasis was put on the characterization of solvent effects on the molecular geometrical structures and geometric distortion, which were measured by the bond-length-alternation parameter. The π centres in the compounds are seen to play a decisive role in increasing the TPA cross section and nonlinear optical properties. All studied molecules have relatively strong TPA characteristics, while the alkyne π-bridging ones yield larger TPA cross sections.

关键词： Nonlinear optics Two photon absorption Solvent effect Charge transfer Bond length alternation

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Latest Neogene Paleoclimate Variation in Yunnan,Southwest China,Revealed by Fossil Leaf Physiognomy

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Acta Geologica Sinica(English Edition) 2023年第4期97卷 1268-1281页

作者： dai jing CHEN Weizhao HUANG Liang ZHANG Yi’nan School of Earth Science Yunnan UniversityKunming 650500China Ministry of Natural Resources Key Laboratory of Sanjiang Metallogeny and Resources Exploration and Utilization Kunming 650051China Yunnan Institute of Geological Survey Kunming 650216China Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of SciencesBeijing 100044China

Yunnan Province,located in the southeastern margin of the Tibetan Plateau,can provide important information on how climate change was influenced by global ***,its variation patterns in temperature and precipitation during the latest Neogene are not *** on the 357 specimens assigned to 31 morphotypes of plant fossils from the upper Pliocene Ciying Formation in Yiliang County,Yunnan Province,Southwest China,paleoclimate was estimated by Leaf Margin Analysis and Climate Leaf Analysis Multivariate *** to the present climate,the mean annual temperature and coldest month temperature have not changed significantly since the late Pliocene,whereas the warmest month temperature has decreased *** precipitation-related parameters have decreased,particularly winter *** with the climatic data of the same period in other areas of Yunnan,the western and eastern Yunnan has shown a similar pattern in temperature variation since the late Pliocene except for central Yunnan;whereas the variation in precipitation does not follow a common law except for a consistent decrease in winter *** study reinforced the fact that under the background of global cooling and intensified monsoon systems,different areas of Yunnan exhibit different climatic responses to these changes because of their topographic heterogeneities.

关键词： plant fossil paleoclimate reconstruction monsoon Pliocene Yunnan

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Mono-disperse SrMoO4 nanocrystals:Synthesis,luminescence and photocatalysis

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Journal of Materials Science & Technology 2017年第8期33卷 834-842页

作者： Ya-Nan Zhu Gan-Hong Zheng Zhen-Xiang dai jing-jing Mu Zi-Fen Yao Anhui Key Laboratory of Information Materials and Devices School of Physics and Materials SdenceAnhui UniversityHefei 230039China

Well-dispersed uniform SrMoO4 nanocrystals were synthesized by thermal decomposition of a metalorganic salt in the organic solvent under different temperatures（80, 100, 120, 140, and 160？C）. The smallest diameter of these SrMoO4 nanocrystals is only about 2 nm, which is regarded as the smallest values to date. The UV–vis absorbance spectra present that the larger absorption of our samples is mainly distributed in the visible light region and UV light region. The lowest energy gap is found to be 2.71 e *** a small gap is ascribed to the introduction of intermediate energy levels, which are due to the surface defects with decreasing the size of nanostrcutrues. The photoluminescence measurement suggests that all these samples exhibit a board and strong emission band in the range from 500 to 700 nm. Through the deconvolution of the photoluminescence spectra, the emission profiles are found to be associated with three various components（green, yellow, and red）. Moreover, the photodegration of methyl blue over our SrMoO4 samples reaches nearly 100% in 120 min. Such a high photodegration may be related to the following aspects. One is related to the size and morphology. Larger surface area leads to more absorption of methyl blue, and the small size nanoparticles lead to the efficient separation of these photogenerated electron-hole pairs. The other is related to the narrow band gap. The small gap is beneficial to more electrons to be excited from the valence band to the conduction band, and eventually more electron-hole pairs are created. Our investigations clearly suggest that thermal decomposition of one metal-organic salt in organic solvent will be a good choice to synthesize the nanoparticles with small size and uniform distribution. Our results also indicate that these SrMoO4 nanoparticles possibly have great potential utilities in photocatalysts.

关键词： SrMoO4 Nanocrystals Luminescence Photocatalyst

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RESEARCH ON THE HYDRODYNAMIC CHARACTERISTICS OF CAVITATING GRID FINS

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Journal of Hydrodynamics 2006年第5期18卷 537-541页

作者： WU Lei LU chuan-jing HUANG Tao LI Jie Department of Engineering Mechanics Shanghai Jiaotong University Shanghai 200240 China

A two-phase mixture model based on the solution for the Navier-Stokes equations has been utilized in calculating the hydrodynamic characteristics of cavitating honeycomb grid fins with different configurations. The calculation results of lift, drag, and hinge moment coefficients are presented in various cavitation numbers and angles of attack, and its hydrodynamic features are also analyzed. The calculation results indicate that cavitation will reduce the lift/drag ratio of grid fins. The increment of horizontal blades as lift surface cannot unendingly improve lift because of the disturbance between the blades.

关键词： grid fin cavitating flow hydrodynamic characteristic equivalence

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Electronic structure and optical properties of non-metallic modified graphene:a first-principles study

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Communications in Theoretical Physics 2022年第3期74卷 70-76页

作者： jing-tao Huang Yong Liu Zhong-hong Lai Jin Hu Fei Zhou jing-chuan Zhu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China National Key Laboratory for Precision Hot Processing of Metals Harbin Institute of TechnologyHarbin 150001China Center for analysis measurement and computingHarbin Institute of TechnologyHarbin 150001China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China

In this paper,the electronic structure and stability of the intrinsic,B-,N-,Si-,S-doped graphene are studied based on first-principles calculations of density functional ***,the intrinsic,B-,N-,Si-,S-doped graphene structures are optimized,and then the forming energy,band structure,density of states,differential charge density are analyzed and *** results show that Band Si-doped systems are p-type doping,while N is n-type *** comparing the forming energy,it is found that N atoms are more easily doped in *** addition,for B-,N-,Si-doped systems,it is found that the doping atoms will open the band gap,leading to a great change in the band structure of the doping ***,we systematically study the optical properties of the different *** comparison,it is found that the order of light sensitivity in the visible region is as follows:S-doped>Si-doped>pure>B-doped>*** results will provide theoretical guidance for the stability and electronic structure of non-metallic doped graphene.

关键词： Graphene Non-metallic Electronic structure Optical properties Density functional theory

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Mushroom-shaped Morphology Formed in Thin Films of Cylinder-forming Block Copolymer

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Chemical Research in Chinese Universities 2011年第1期27卷 150-153页

作者： GONG Yu-mei SONG jing-chuan ZHANG Gui-xia School of Chemical and Material Dalian Polytechnic University Dalian 116034 P R. China

The morphology of the film of polystyrene-block-poly（methyl methacrylate）（PS-b-PMMA） block copolymer having polystyrene（PS） cylinder forming composition spin-coated on a neutral brush modified silicon substrate has been investigated in this report. A mushroom-shaped morphology formed in the film with one period to two periods（L0--2L0） in thickness, which was spin-coated under a low humidity condition（RH ca.13%） and then thermally annealed at an extreme high temperature（230 ℃）. The results suggest that the spin-coating condition together with the confinement conditions plays a crucial role in the interesting morphology formation.

关键词： Block copolymer Film Morphology

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Transmission capacity for inhomogeneous overlaid wireless Ad-hoc networks

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The Journal of China Universities of Posts and Telecommunications 2013年第3期20卷 8-12,25页

作者： LIU Yang GAO jing SUN Xiao-hui YIN Chang-chuan School of Information and Communication Engineering Beijing University of Posts and Telecommunications

In the analysis of overlaid wireless Ad-hoc networks, the underlying node distributions are commonly assumed to be two independent homogeneous Poisson point processes. In this paper, by using stochastic geometry tools, a new inhomogeneous overlaid wireless Ad-hoc network model is studied and the outage probability are analyzed. By assuming that primary （PR） network nodes are distributed as a Poisson point process （PPP） and secondary （SR） network nodes are distributed as a Matern cluster processes, an upper and a lower bounds for the transmission capacity of the primary network and that of the secondary network are presented. Simulation results show that the transmission capacity of the PR and SR network will both have a small increment due to the inhomogeneity of the SR network.

关键词： transmission capacity Ad-hoc network PPP Matem cluster process

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Resorption of upwardly displaced lumbar disk herniation after nonsurgical treatment: A case report

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World Journal of Clinical Cases 2020年第19期8卷 4609-4614页

作者： Yi Wang Shi-chuan Liao Guo-Gang dai Ling Jiang Cervicodynia/Omalgia/Lumbago/Sciatica Department2 Sichuan Provincial Orthopedics HospitalChengdu 610041Sichuan ProvinceChina College Hospital Sichuan Agricultural University-Chengdu CampusChengdu 611130Sichuan ProvinceChina

BACKGROUND The spontaneous resorption of lumbar disk herniations(LDHs)has been widely ***,the majority of these reports analyze the resorption of LDHs that were displaced backwards or *** have been few reports on the spontaneous resorption of upwardly displaced L4/5 LDH that has caused femoral nerve *** SUMMARY A 55-year-old woman presented to our hospital with acute pain in her left *** had been suffering from recurrent lower back pain for approximately 1 year and began to feel pain accompanied with numbness at the anterior aspect of her left leg 7 d *** examination,a typical L4 nerve stimulation was *** upwardly displaced LDH at the L4/5 level was revealed by magnetic resonance *** patient attained complete relief of her symptoms after 10 wk of nonsurgical treatment and the upwardly displaced herniation almost entirely *** was no recurrence during a follow-up of 2 *** Clinicians should be aware that the nerves disturbed by LDHs vary according to the direction of the herniations and the probable resorption of upwardly displaced LDHs should be considered before making a decision on surgery.

关键词： Lumbar disk herniation Upward displacement Resorption Neurology Rehabilitation Case report

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