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Co-oxidation of arsenic(Ⅲ) and iron(Ⅱ) ions by pressurized oxygen in acidic solutions

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 181-189页

作者： Ke-zhou Song Ping-chao Ke zhi-yong liu zhi-hong liu School of Metallurgy and Environment Central South University

The co-oxidation of As(Ⅲ) and Fe(Ⅱ) in acidic solutions by pressured oxygen was studied under an oxygen pressure between 0.5 and 2.0 MPa at a temperature of 150℃. It was confirmed that without Fe(Ⅱ) ions, As(Ⅲ) ions in the solutions are virtually non-oxidizable by pressured oxygen even at a temperature as high as 200℃ and an oxygen pressure up to 2.0 MPa. Fe(Ⅱ) ions in the solutions did have a catalysis effect on the oxidation of As(Ⅲ), possibly attributable to the production of such strong oxidants as hydroxyl free radicals (OH ) and Fe(Ⅳ) in the oxidation process of Fe(Ⅱ). The effects of such factors as the initial molar ratio of Fe(Ⅱ)/As(Ⅲ), initial pH value of the solution, oxygen pressure, and the addition of radical scavengers on the oxidation efficiencies of As(Ⅲ) and Fe(Ⅱ) were studied. It was found that the oxidation of As(Ⅲ) was limited in the co-oxidation process due to the accumulation of the As(Ⅲ) oxidation product, As(Ⅴ), in the solutions.

关键词： co-oxidation As As(Ⅲ)oxidation Fe(Ⅱ) pressured oxygen radical scavenger

Synthesis, characterization, and property test of crystalline polyferric sulfate adsorbent used in treatment of contaminated water with a high As(Ⅲ) content

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International Journal of Minerals,Metallurgy and Materials 2018年第10期25卷 1217-1225页

作者： Ping-chao Ke zhi-hong liu Lin Li School of Metallurgy and Environment Central South UniversityChangsha 410083China The Robert M.Buchan Department of Mining Queen's UniversityKingstonON K7L 3N6Canada

A crystalline polyferric sulfate(PFS) adsorbent was synthesized by oxidizing and precipitating ferrous ions in air atmospheric conditions. The morphology, structure, specific surface area(SSA), and adsorptive efficacy of the adsorbent to As(Ⅲ) were characterized by scanning electron microscope(SEM) and transmission electron microscopy(TEM) images, X-ray diffraction(XRD) patterns, Fourier-transform infrared(FTIR) spectra, BET SSA analyses, and adsorption experiments. The adsorbent showed a near-spherical aggregate structure and had good crystallinity. A significant amount of α-goethite co-precipitated with PFS in the case of the initial ferrous concentration of 1 mol/L and increased SSA of the adsorbent. The stability region of ferric compounds in the process was drawn and applied to analyze the iron behavior during the synthesis. The adsorption of As(Ⅲ) in high As(Ⅲ)-containing solutions fitted the Langmuir isotherm model adequately. The absorbent with co-precipitation of α-goethite showed good adsorbability for As(Ⅲ) and good filtering performance in the high As(Ⅲ)-containing solution of 10–100 mg/L under acidic, neutral, and alkaline conditions(pH 2.09–9.01). After the adsorption process, the stability of the residues bearing As(Ⅲ) was evaluated by toxic characteristic leaching procedure(TCLP) tests. The results indicated that the residues were extremely stable, and the concentrations of arsenic in the leaching solutions were less than 0.01 mg/L.

关键词： polyferric sulfate crystal structure α-goethite high As(Ⅲ)-containing contaminated water wide pH range As(Ⅲ) adsorption

Reduced graphene oxide-supported CoP nanocrystals confined in porous nitrogen-doped carbon nanowire for highly enhanced lithium/sodium storage and hydrogen evolution reaction

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Nano Research 2019年第11期12卷 2872-2880页

作者： Xiaojun Zhao Dan Luo Yan Wang zhi-hong liu Key Laboratory for Macromolecular Science of Shaanxi Province School of Chemistry and Chemical EngineeringShaanxi Normal UniversityXi’an710062China

Rational synthesis of a hierarchical porous architecture with highly active and consecutive conductive network is very critical to achieve the high-performance of nanomaterials in electrochemical energy conversion and *** propose here a hierarchical micro-/nanostructured hybrids constructed by the dual carbon shell nanowire host containing CoP nanocrystals of several nanometers,which generates Co-based metal-organic framework on graphene oxide nanosheets in situ and followed a direct phosphorization(CoP@NC/rGO).The dual carbon shell,consisting of Co-based metal-organic framework derived porous doped carbon(NC)and reduced graphene oxide(rGO),can not only impedes CoP nanocrystals from coalescing,and renders highly exposed the electrochemically accessible active sites,but also provides the multidimensional pathways for rapid electron and ion *** importantly,the covered dual carbon shell on CoP nanocrystals plays a role as a protective layer to impede the nanocrystals’*** virtue of compositional and structural advantages,the micro-/nanostructured CoP@NC/rGO hybrids manifest outstanding energy storage properties when evaluated as anodes for lithium/sodium ion ***,it also reveals highly efficient electrocatalytic performance for hydrogen evolution reaction in acid media with low Tafel slope,overpotential and robust durability.

关键词： micro-/nanostructured metal-organic framework CoP@NC/rGO lithium/sodium ion batteries hydrogen evolution reaction

BnWRI1 coordinates fatty acid biosynthesis and photosynthesis pathways during oil accumulation in rapeseed

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Journal of Integrative Plant Biology 2014年第6期56卷 582-593页

作者： Xue-Long Wu zhi-hong liu Zhang-Hua Hu Rui-zhi Huang Institute of Virology and Biotechnology Zhejiang Academy of Agricultural Sciences Key Laboratory of Plant Metabolic Engineering of Zhejiang Province

Photosynthesis in“green”seeds, such as rapeseed, soybean, and Arabidopsis, plays a substantial role in the improved efficiency of oil accumulation. However, the molecular mecha-nism underpinning the coordinated expression of fatty acid （FA） biosynthesis-and photosynthesis-related genes in such develop-ing seeds remains to be elucidated. Here, we found that seed-specific overexpression of BnWRI1, a WRI1 homolog from rapeseed （Brassica napus cv. ZGY2）, results in enhanced chlorophyl content in developing seeds and increased oil content and seed mass in matured seeds. BnWRI1 was co-expressed with BnBCCP and BnCAB, two marker genes of FA biosynthesis and photosynthesis during seed development, respectively. Over-expression of BnWRI1 increased expression of both marker genes. Further, the nuclear-localized BnWRI1 protein was found to act as a transcription activator. It could bind to the GT1-element and/or GCC-box, which are widespread in the upstream regions of genes involved in FA biosynthesis and photosynthesis pathways. Accordingly, BnWRI1 could interact with promoters of BCCP2 and LHB1B2 in vivo. These results suggested that BnWRI1 may coordinate FA biosynthesis and photosynthesis pathways in developing seeds via directly stimulating expression of GT1-element and/or GCC-box containing genes.

关键词： BnWRI1 Brassica napus oil accumulation photosynthesis transcription factor

Highly active CoP-CO_(2)N confined in nanocarbon enabling efficient electrocatalytic immobilizing-conversion of polysulfide targeting high-rate lithium-sulfur batteries

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Journal of Energy Chemistry 2022年第12期75卷 250-259,I0006页

作者： Xiaojun Zhao Tianqi Gao Wenhao Ren Chuan Zhao zhi-hong liu Linbo Li School of Metallurgical Engineering Xi'an University of Architecture and TechnologyXi'an 710055ShaanxiChina School of Chemistry and Chemical Engineering Shaanxi Normal UniversityXi’an 710062ShaanxiChina School of Chemistry University of New South WalesSydneyNSW 2052Australia

Lithium-sulfur batteries suffer from poor cycling stability because of the intrinsic shuttling effect of intermediate polysulfides and sluggish reaction kinetics,especially at high rates and high sulfur ***,we report the construction of a CoP-CO_(2)N@N-doped carbon polyhedron uniformly anchored on three-dimensional carbon nanotubes/graphene(CoP-CO_(2)N@NC/CG)scaffold as a sulfur reservoir to achieve the trapping-diffusion-conversion of *** active CoP-CO_(2)N shows marvelous catalytic effects by effectively accelerating the reduction of sulfur and the oxidation of Li_(2)S during the discharging and charging process,respectively,while the conductive NC/CG network with massive mesoporous channels ensures fast and continuous long-distance electron/ion *** calculations demonstrate that the CoP-CO_(2)N with excellent intrinsic conductivity serves as job-synergistic immobilizing-conversion sites for polysulfides through the formation of P…Li/N…Li and Co…S *** a result,the S@CoP-CO_(2)N@NC/CG cathode(sulfur content 1.7 mg cm^(-2))exhibits a high capacity of988 mAh g^(-1)at 2 C after 500 cycles,which is superior to most of the electrochemical performance *** under high sulfur content(4.3 mg cm^(-2)),it also shows excellent cyclability with high capacity at 1 C.

关键词： CoP-CO_(2)N@NC/CG Trapping-diffusion-conversion High-rate DFT calculation Li-S battery

A Low Temperature Vulcanized Transparent Silane Modified Epoxy Resins for LED Filament Bulb Package

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Chinese Journal of Polymer Science 2018年第5期36卷 649-654页

作者： Xiong-Fa Yang Jia liu Qiong Chen Yan-Ping Shen hong-zhi liu Guo-Qiao Lai Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education Hangzhou Normal University School of Chemistry and Chemical Engineering Shandong University

In this work, low-temperature vulcanized, transparent silane modified epoxy resins for LED filament bulb package were prepared. Firstly, transparent silane modified epoxy resins were produced through a controllable sol-gel method using γ-（2,3-epoxypropoxy）propytrimethoxysilane and dimethyldiethoxylsilane. The features of the reaction were investigated and the products were characterized in detail. Subsequently, various curing agents were explored to prepare transparent silane modified epoxy resins. The silane modified epoxy resins cured by PEA-230 at a fairly low temperature（40 °C/2 h then 60 °C/1 h） exhibited excellent thermal stability with a thermal degradation temperature as high as 316.5 °C and adjustable hardness between 40-60 shore A. The application tests showed the materials obtained were good candidates for LED filament bulb package.

关键词： Silane modified epoxy resins LED filament bulb Package materials

Evaluation of progressive early rehabilitation training mode in intensive care unit patients with mechanical ventilation

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World Journal of Clinical Cases 2022年第23期10卷 8152-8160页

作者： Xiao-Jing Qie zhi-hong liu Li-Min Guo Department of Cardiology The Fourth Hospital of Hebei Medical UniversityShijiazhuang 050011Hebei ProvinceChina Department of Intensive Care Unit The Fourth Hospital of Hebei Medical UniversityShijiazhuang 050011Hebei ProvinceChina

BACKGROUND Mechanical ventilation is a common resuscitation method in the intensive care unit(ICU).Unfortunately,this treatment process prolongs the ICU stay of patients with an increased incidence of delirium,which ultimately affects the *** To evaluate the effect of progressive early rehabilitation training on treatment and prognosis of patients with mechanical ventilation in *** The convenience sampling method selected 190 patients with mechanical ventilation admitted to the Fourth Hospital of Hebei Medical University from March 2020 to March *** to the random number table method,they were divided into the control and intervention *** control group received routine nursing and rehabilitation measures,whereas the intervention group received progressive early rehabilitation *** addition,the incidence and duration of delirium were compared for the two groups along with mechanical ventilation time,ICU hospitalization time,functional independence measure(FIM)score,Barthel index,and the incidence of complications(deep venous thrombosis,pressure sores,and acquired muscle weakness).RESULTS In the intervention group,the incidence of delirium was significantly lower than in the control group(28%vs 52%,P<0.001).In the intervention group,the duration of delirium,mechanical ventilation time,and ICU stay were shorter than in the control group(P<0.001).The FIM and Barthel index scores were significantly higher in the intervention group than the control group(P<0.001).The total incidence of complications in the intervention group was 3.15%,which was lower than 17.89%in the control group(P<0.001).CONCLUSION Progressive early rehabilitation training reduced the incidence of delirium and complications in ICU patients with mechanical ventilation,which improved prognosis and quality of life.

关键词： Mechanical ventilation Intensive care unit Early rehabilitation training Delirium Barthel index

Conceptual design and safety characteristics of a new multi-mission high flux research reactor

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Nuclear Science and Techniques 2023年第3期34卷 9-24页

作者： Wei Xu Jian Li Heng Xie zhi-hong liu Jing Zhao Fei Xie Lei Shi School of Nuclear Science and Engineering Beijing Key Laboratory of Passive Safety Technology for Nuclear EnergyNorth China Electric Power UniversityBeijing 102206China Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyKey Laboratory of Advanced Reactor Engineering and Safety of Ministry of EducationTsinghua UniversityBeijing 100084China

Research reactors with neutron fluxes higher than 10^(14) n cm^(−2) s^(−1) are widely used in nuclear fuel and material irradiation,neutron-based scientific research,and medical and industrial isotope *** high flux research reactors are not only important scientific research facilities for the development of nuclear energy but also represent the national comprehensive technical *** has several high flux research reactors that do not satisfy the requirements of nuclear energy development.A high flux research reactor has the following features:a compact core arrangement,high power density,plate-type fuel elements,a short refueling cycle,and high coolant velocity in the *** characteristics make it difficult to simultaneously realize high neutron flux and optimal safety margin.A new multi-mission high flux research reactor was designed by the Institute of Nuclear and New Energy Technology at Tsinghua University in China;the reactor can simul-taneously realize an average neutron flux higher than 2.0×10^(15) n cm^(−2) s^(−1) and fulfill the current safety *** high flux research reactor features advanced design concepts and has sufficient safety margins according to the preliminary safety *** on the analysis of the station blackout accident,loss of coolant accident,and reactivity accident of a single-control drum rotating out accidently,the maximum temperature of the cladding surface,minimum departure from nucleate boiling ratio,and temperature difference to the onset of nucleate boiling temperature satisfy the design limits.

关键词： High flux research reactor Neutron flux Safety analysis Maximum temperature of cladding surface Departure from nucleate boiling ratio

Numerical study of MHD mixed convection under volumetric heat source in vertical square duct with wall effects

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Theoretical & Applied Mechanics Letters 2019年第3期9卷 152-160页

作者： zhi-hong liu Ming-Jiu Ni Nian-Mei Zhang School of Engineering Sciences University of Chinese Academy of Sciences

Magnetohydrodynamic (MHD) mixed convection under strong magnetic field and volumetric heat source for buoyancy-assisted flows are studied numerically in this paper. Blanket is one of key components for energy conversion in Tokamak fusion reactor. The physical model employed for simulations is refined from dual-coolant lead-lithium (DCLL) blanket. A magnetic-convection code based on a consistent and conservative scheme is developed with the help of finite volume method, and validated by some Benchmark analytical solutions. The flows inside duct with thermal insulating and electric conducting walls under exponential neutron volumetric heat source are simulated. Based on Boussinesq assumption, the influences of wall electrical conductivity and buoyancy on velocity fields, temperature distributions and Nusselt numbers are investigated. Results illustrates that the wall conductance ratio dominates the flow at low Grashof numbers and high wall conductance ratio, while buoyancy effect dominates the jet flow near side wall at a high Grashof number. In addition, the velocity along flow direction substantially impacts features of the Nusselt number and temperature distribution. Besides, the jet flow results in a higher Nusselt number and lower temperature.

关键词： Mixed convection Magnetohydrodynamic (MHD) Volumetric heat source