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Effects of reductive inorganics and NOM on the formation of chlorite in the chlorine dioxide disinfection of drinking water

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Journal of Environmental Sciences 2021年第6期33卷 225-232页

作者： Biao yang Hua fang Bingqi Chen shun yang Zhichao Ye Jianghua Yu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology School of Environmental Science&EngineeringNanjing University of Information Science&TechnologyNanjing 210044China

Chlorine dioxide(ClO_(2))disinfection usually does not produce halogenated disinfection byproducts,but the formation of the inorganic by-product chlorite(ClO^(–)_(2))is a serious *** this study,the ClO^(–)_(2)formation rule in the ClO_(2)disinfection of drinking water was investigated in the presence of three representative reductive inorganics and four natural organic matters(NOMs),***^(2+)and S^(2–)mainly reduced ClO_(2)to ClO^(–)_(2)at low *** ClO_(2)was consumed,the ClO^(–)_(2)would be further reduced by Fe^(2+)and S^(2–),leading to the decrease of ClO^(–)_(2).The reaction efficiency of Mn^(2+)with ClO_(2)was lower than that of Fe^(2+)and S^(2–).It might be the case that Mn O 2 generated by the reaction between Mn^(2+)and ClO_(2)had adsorption and catalytic oxidation on Mn^(2+).However,Mn^(2+)would not reduce ClO^(–)_(2).Among the four NOMs,humic acid and fulvic acid reacted with ClO_(2)actively,followed by bovine serum albumin,while sodium alginate had almost no reaction with ClO_(2).The maximum ClO^(–)_(2)yields of reductive inorganics(70%)was higher than that of NOM(around 60%).The lower the concentration of reductive substances,the more ClO^(–)_(2)could be produced by per unit concentration of reductive *** results of the actual water samples showed that both reductive inorganics and NOM played an important role in the formation of ClO^(–)_(2)in disinfection.

关键词： Chlorine dioxide Chlorite Disinfection by-products Reductive inorganics Natural organic matter

Synthesis and performance of Ca-α/β-SiAlON composites from tailings

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International Journal of Minerals,Metallurgy and Materials 2014年第5期21卷 515-522页

作者： Hong-shun Hao yang yang fang Lian Wen-yuan Gao Gui-shan Liu Zhi-qiang Hu Institute of New Energy Materials Dalian Polytechnic University Liaoning Provincial Key Laboratory of New Materials and Material Modification Dalian Polytechnic University School of Materials Science and Engineering University of Science and Technology Beijing

Ca-α/β-SiAlON composites were prepared using Ca-α/β-SiAlON powder synthesized from gold ore tailings, which contained abundant Si and Al elements as the major raw materials together with minor additives, through a pressure-less sintering method. The influ- ences of sintering temperature on the phase composition and mierostrueture of the composites were analyzed. The scanning electron micros- copy images of the composites show the interlacing of grains with elongated columnar, short columnar and plate-like morphologies. The composites sintered at 1520℃ for 6 h have a flexural strength of 352 MPa, Vickers hardness of 11.2 GPa, and fracture toughness of 4.8 MPa·m1/2. The relative content of each phase in the products is I（Ca-α-SiAION）：I（β-SiAlON）：I（Fe3Si） = 23：74：3, where Ii stands for the dif- fraction peak intensity of phase i.

关键词： ceramic materials composite materials tailings mechanical properties microstructure sintering

High spatial resolution spectroscopy of G292.0+1.8 with Chandra

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Research in Astronomy and Astrophysics 2014年第10期14卷 1279-1288页

作者： Xue-Juan yang Xiao-Qin Liu shun-Yu Li fang-Jun Lu Faculty of Materials Optoelectronics and PhysicsXiangtan University Particle Astrophysics Center Institute of High Energy PhysicsChinese Academy of Sciences

We present high spatial resolution X-ray spectroscopy of supernova rem- nant G292.0＋1.8 made with Chandra observations. The X-ray emitting region of this remnant was divided into 25 × 25 pixels with a scale of 20＂ × 20＂ each. Spectra of 328 pixels were created and fitted with an absorbed one component non-equilibrium ionization model. With the spectral analysis results, we obtained maps of absorbing column density, temperature, ionization age and abundances for O, Ne, Mg, Si, S and Fe. The abundances of O, Ne and Mg show tight correlations between each other in the range of about two orders of magnitude, suggesting that they are all from explo- sive C/Ne burning. Meanwhile, the abundances of Si and S are also well correlated, indicating that they are the ashes of explosive O-burning or incomplete Si-burning. The Fe emission lines are not prominent in the whole remnant, and their abundance is significantly reduced, indicating that the reverse shock may not have propagated to the Fe-rich ejecta. Based on relative abundances of O, Ne, Mg, Si and Fe to Si, we suggest a progenitor mass of 25 - 30 M⊙ for this remnant.

关键词： ISM supernova remnants -- ISM individual G292.0+1.8

Microstructures of Ti–Ni–Fe wire after severe cold-drawing and annealing

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Rare Metals 2013年第6期32卷 550-554页

作者： Hui-fang Geng Fu-shun Liu School of Material Science and Engineering Beijing University of Aeronautics and Astronatics

The microstructures and mechanical properties of Ti–47 at%Ni–3 at%Fe shape memory alloy wire under the condition of severe cold-drawing at room temperature and different postdeformation annealing processes were intensively investigated using transmission electron microscope(TEM),X-ray diffraction(XRD),Vickers microhardness tester and electron tensile *** is indicated that the structure of the alloy evolves into a predominant amorphous structure with a trace of nanocrystalline B2 phase after the cold-drawing of 76%areal *** annealing process exerted significant influence on the microstructure and mechanical *** occurs when the cold-drawn wire was annealed at 300℃ for 30 *** ultimate tensile strength and ductility as well as the superelasticity of the wire are improved significantly by cold-drawing plus postdeformation annealing.

关键词： Ti–Ni–Fe wire Severe plastic deformation Cold-drawing Annealing Amorphous structure

On the Fekete and Szego Problem for Starlike Mappings of Order α

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Acta Mathematica Sinica,English Series 2017年第4期33卷 554-564页

作者： Qing Hua XU fang fang Tai shun LIU College of Mathematics and Information Science JiangXi Normal University Nanchang 330022 P. R. China Department of Mathematics Huzhou University Huzhou 313000 P. R. China

Let Sα*be the familiar class of normalized starlike functions of order α in the unit disk. In this paper, we establish the Fekete and Szeg? inequality for the class Sα*, and then we generalize this result to the un... 详细信息

关键词： Fekete–Szego problem starlike mappings of order α sharp coefficient bound

Strong internal electric field enhanced polysulfide trapping and ameliorates redox kinetics for lithium-sulfur battery

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Journal of Energy Chemistry 2023年第2期77卷 376-383,I0010页

作者： Bin yang Jinyi Wang Yuheng Qi Daying Guo Xueyu Wang Guoyong fang Xi’an Chen shun Wang Key Laboratory of Carbon Materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035ZhejiangChina

The shuttle effect of polysulfides is a major challenge for the commercialization of lithium-sulfur *** systematic modification of separators has the potential to solve these problems by enhancing the adsorption and catalytic conversion of ***,strong internal electric field bismuth oxycarbonate(Bi_(2)O_(2)CO_(3))nanoflowers decorated conductive carbon(DC+BOC)is proposed to be systematically modified on *** intermediate layer not only possesses a strong affinity for polysulfides,but also promotes the conversion of polysulfides and induces the formation of a stable solid electrolyte interphase(SEI)layer,thereby improving the rate performance and cycling stability of the *** expected,the modified membrane achieved a high specific capacity of 713 mA h g^(-1) at 5 *** 1 C,high reversibility of 719 mA h g^(-1) was achieved after 550 cycles with only 0.044%decay per *** importantly,under the sulfur loading of 5.1 mg cm^(-2),the area specific capacity remained at4.1 mA h cm^(-2) after 200 cycles,and the attenuation rate per cycle was only 0,056%.This work provides a new strategy to overcome the shuttle effect of polysulfide,and shows great potential in the application of high-performance lithium-sulfur batteries.

关键词： Interlayer Strong built-in electric field Catalytic Shuttle effect Lithiumsulfur battery

Research on Comparison and Evaluation Studies of Several Smoothing Denoising Method Based on γ-ray Spectrum Detector

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Journal of Harbin Institute of Technology(New Series) 2013年第2期20卷 7-11页

作者： Jian-Feng He fang fang Yao-Zong yang Yue-shun He Bin Tang College of Nuclear Technology and Automation Engineering Chengdu University of Technology Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National Defense East China Institute of Technology

The extraction of spectral parameters is very difficult because of the limited energy resolution for NaI （TI） gamma-ray detectors. For statistical fluctuation of radioactivity under complex environment, some smoothing filtering methods are proposed to solve the problem. These methods include adopting method of arithmetic moving average, center of gravity, least squares of polynomial, slide converter of discrete funcion convolution etc. The process of spectrum data is realized, and the results are assessed in H/FWHM（ Peak High/Full Width at Half Maximum） and peak area based on the Matlab programming. The results indicate that different methods smoothed spectrum have respective superiority in different ergoregion, but the Gaussian function theory in discrete function convolution slide method is used to filter the complex y-spectrum on Embedded system nlatform, and the statistical fluctuation of y-snectrum filtered wall.

关键词： T-spectrum data-processing smoothing denoising method comparison and evaluation matlabprogramming

Metal–Organic Framework-Based Sensors for Environmental Contaminant Sensing

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Nano-Micro Letters 2018年第4期10卷 92-110页

作者： Xian fang Boyang Zong shun Mao Biomedical Multidisciplinary Innovation Research Institute Shanghai East Hospital State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai Institute of Pollution Control and Ecological Security

Increasing demand for timely and accurate environmental pollution monitoring and control requires new sensing techniques with outstanding performance, i.e.,high sensitivity, high selectivity, and reliability. Metal–organic frameworks(MOFs), also known as porous coordination polymers, are a fascinating class of highly ordered crystalline coordination polymers formed by the coordination of metal ions/clusters and organic bridging linkers/ligands. Owing to their unique structures and properties,i.e., high surface area, tailorable pore size, high density of active sites, and high catalytic activity, various MOF-based sensing platforms have been reported for environmental contaminant detection including anions, heavy metal ions,organic compounds, and gases. In this review, recent progress in MOF-based environmental sensors is introduced with a focus on optical, electrochemical, and field-effect transistor sensors. The sensors have shown unique and promising performance in water and gas contaminant sensing. Moreover, by incorporation with other functional materials, MOF-based composites can greatly improve the sensor performance. The current limitations and future directions of MOF-based sensors are also discussed.

关键词： Metal–organic frameworks Environmental contaminant Optical sensor Electrochemical sensor Field-effect transistor sensor Micro- and nanostructure

A highly selective solid-contact electrode for Ag^+ based on a monoazathiacrown ether ionophore

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Chinese Chemical Letters 2012年第4期23卷 488-491页

作者： shun yang Yu Lan Ju Fu Hai Li Yong Ming Liu Jun Feng fang Key Laboratory of Coastal Zone Environmental Processes Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China Zhejiang Textile and Fashion College Ningbo 31521lChina Chemistry and Chemical Engineering College Yantai UniversityYantai 264005China Ningbo Institute of Material Technology&Engineering Chinese Academy of SciencesNingbo 315201China

A new solid-contact Ag~＋-selective electrode was prepared with 9,10,12,13,24,25-hexahydro-5H,15H,23H-dibenzo [b,q][1,7,10,13,19,4,16]-entathiadiazacyclodocosine-6,16（7H,17H）-dione as ionophore,and cc,a-dihexylsexithiophene（DH- 6T） ion-to-electron *** sensor exhibited a working concentration range of 10~8 to 10^（-3） mol/L,with a near-Nernstian slope of 55.1±0.2 mV/dec and detection limit of 1.7×10^（-9） mol/*** fabricated electrodes demonstrated excellent selectivity over the most common monovalent and divalent cations.

关键词： Solid contact Silver Ion-selective electrodes Low detection limit