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Comparison of Ti/Ti4O7, Ti/Ti4O7-PbO2-Ce, and Ti/Ti4O7 nanotube array anodes for electro-oxidation of p-nitrophenol and real wastewater

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SEPARATION AND PURIFICATION TECHNOLOGY 2021年 266卷 118600-118600页

作者： Wang, Huijiao Li, Zhongyi zhang, Fengyuan Wang, Yuxiang zhang, Xian Wang, Jianbing He, xuwen China Univ Min & Technol Beijing Sch Chem & Environm Engn Beijing 100083 Peoples R China Beijing Normal Univ High Sch 2 Beijing 100088 Peoples R China Inner Mongolia Univ Technol Hohhot 010051 Peoples R China

Three types of Magneli phase anodes (Ti/Ti4O7, Ti/Ti4O7-PbO2-Ce, and Ti/Ti4O7 nanotube arrays (NTA)) were fabricated, characterized, and compared with other typical active and non-active anodes (i.e., BDD, Ti/Pt, Ti/RuO2-IrO2, and Ti/IrO2-Ta2O5) for electro-oxidation treatment of p-nitrophenol (PNP) solution and a real coal chemical concentrated brine in this study. Characterization results indicate a nanotube array structure of Ti/Ti4O7 NTA, and a compact coating of Ti4O7 microparticles and PbO2-Ce nanocrystals on the Ti substrate for Ti/Ti4O7 and Ti/Ti4O7-PbO2-Ce, respectively. The three anodes present relatively high oxygen evolution potentials (2.16-2.44 V vs SCE), showing good capacity of electro-generating reactive oxidative species for pollutant degradation. After 30 min of EO treatment, Ti/Ti4O7 NTA and Ti/Ti4O7 removed 89-92% of PNP, which were 10-60% higher than Ti/Pt, Ti/RuO2-IrO2, and Ti/IrO2-Ta2O5, and were almost comparable with BDD (95%). Furthermore, Ti/Ti4O7 NTA and Ti/Ti4O7 kept very efficient for mineralization of PNP solution and real coal chemical concentrated brine. For Ti/Ti4O7-PbO2-Ce, its degradation efficiency was lower than other two Magneli phase anodes, but still competitive compared with other active anodes. Thanks to their high removal efficiencies, the three Magneli phase anodes required relatively low energy demand for pollutant mineralization. Besides, operational parameters such as electrolyte and current density were also very significant for efficient pollutant removal. The results of this study suggest Magneli phase electrodes as promising and cost-effective anode materials for industrial wastewater treatment, with Ti/Ti4O7 NTA and Ti/Ti4O7 being more efficient options.

关键词： Anode material Magneli phase Ti4O7 Electro-oxidation p-Nitrophenol Real wastewater

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煤矸石的地质聚合反应资源化利用研究进展

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矿业研究与开发 2023年第12期43卷 206-213页

作者：方屹杨浪饶峰张凯铭宁旭文福州大学紫金地质与矿业学院福建福州350108 福建省新能源金属绿色提取与高值利用重点实验室福建福州350108

煤矸石是煤炭开采和洗选加工过程中产生的固体废弃物。煤矸石堆积不仅侵占大量土地面积,还造成水体、空气和土壤的污染,煤矸石的绿色规模化消纳迫在眉睫。针对煤矸石的物化性质、直接利用、提质利用和地质聚合反应利用进行了总结归纳,... 详细信息

煤矸石是煤炭开采和洗选加工过程中产生的固体废弃物。煤矸石堆积不仅侵占大量土地面积,还造成水体、空气和土壤的污染,煤矸石的绿色规模化消纳迫在眉睫。针对煤矸石的物化性质、直接利用、提质利用和地质聚合反应利用进行了总结归纳,并指出煤矸石的地质聚合反应利用是继普通硅酸盐水泥后的第二代绿色胶凝技术,兼具规模化消纳和高值化利用。系统介绍了地聚合物的制备原料、形成过程、反应特点和机理,以及在抗侵蚀材料、耐高温建材、固化重金属和放射性元素等主要场景中的应用。同时指出煤矸石的地质聚合反应资源化利用范围广,利用过程绿色且能耗低,但目前仍存在工业化试验少及规模化推广难等问题。旨在总结煤矸石资源化利用途径的最新研究,进一步为规模化绿色消纳煤矸石提供借鉴。

关键词：煤矸石地质聚合反应资源化利用绿色消纳

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n/γ双粒子反应深度探测器设计与性能表征

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核技术 2023年第7期46卷 53-60页

作者：赵冬梁旭文张荣华黑大千贾文宝单卿凌永生南京航空航天大学材料科学与技术学院南京210000 兰州大学核科学与技术学院兰州730000

n/γ射线双粒子反应深度(Depth of Interaction,DOI)探测器可以实现中子与γ射线甄别并记录粒子在探测器中的反应位置,在对特殊核材料等危险放射性物质的定位成像研究中发挥着重要作用。传统的放射性定位成像装置都依赖具有n/γ射线甄... 详细信息

n/γ射线双粒子反应深度(Depth of Interaction,DOI)探测器可以实现中子与γ射线甄别并记录粒子在探测器中的反应位置,在对特殊核材料等危险放射性物质的定位成像研究中发挥着重要作用。传统的放射性定位成像装置都依赖具有n/γ射线甄别能力的探测器阵列,从而导致成像测量装置结构复杂、成本高。针对此问题,设计了一种基于EJ276塑料闪烁体(Φ3 cm×15 cm)的双粒子反应深度探测器,采用硅光电倍增管在闪烁体两端进行信号读出,并综合利用两端信号幅度与飞行时间对比进行粒子反应位置确定。利用Am-Be中子源和137Cs γ源对探测器进行参数优化和分辨率刻度,结果显示:该探测器在灵敏区内探测效率均匀性较好,反应位置分辨率约4.4 cm。

关键词：反应深度探测器塑料闪烁体 n/γ甄别位置分辨率

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Research progress, problems and prospects of mine water treatment technology and resource utilization in China

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CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY 2020年第4期50卷 331-383页

作者： zhang, Siyu Wang, Hao He, xuwen Guo, Shaoqing Xia, Yu Zhou, Yuexi Liu, Kai Yang, Shipeng China Univ Min & Technol Sch Chem & Environm Engn Beijing 100083 Peoples R China Chinese Res Inst Environm Sci Res Ctr Water Pollut Control Technol Beijing Peoples R China Chinese Acad Sci Res Ctr Ecoenvironm Sci Beijing Peoples R China Tsinghua Univ Sch Environm Beijing Peoples R China

The National Development and Reform Commission and the Energy Bureau jointly issued the 'Plant Water Utilization Development Plan' on January 29, 2013, which requires that China should gradually establish a more complete legal system, macro management and technical support system for mine water in 2015. But so far, due to the influence of geological conditions and other factors, the impurity composition and content of mine water is very different. Based on the comprehensive summary of the theory, method, application technology, practical engineering and processing technology of mine water disaster and its reutilization in China. This article systematically analyzed the latest research progress and achievements, which include basic theory, hydrogeology (supplement) exploration, advanced detection and monitoring as well as early warning. These can further promote application of current technology, develop new technology and methods, point out the challenges and the existing problems of the mine water field, the gaps with requirements of fast, intensive, and large-scale development of the coal industry in China. Finally, the development trends, future important scientific innovation and key technology were discussed. The prospects of the industry and technology were also forecast.

关键词： Mine water resource utilization treatment technology

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Encapsulated boron-based energetic spherical composites with improved reaction efficiency and combustion performance

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CHEMICAL ENGINEERING JOURNAL 2022年第Part1期433卷 134478-134478页

作者： Hu, Yinghui Wang, xuwen zhang, Jian Zhu, Zhaoyang Ren, Xiaoting Yang, Yulin Lin, Kaifeng Pang, Aimin Shuai, Yong Harbin Inst Technol Sch Chem & Chem Engn MIIT Key Lab Crit Mat Technol New Energy Convers Harbin 150001 Peoples R China Harbin Inst Technol Sch Energy Sci & Engn Harbin 150001 Peoples R China Hubei Inst Aerosp Chemotechnol Sci & Technol Aerosp Chem Power Lab Xiangyang 441003 Hubei Peoples R China

The low energy release efficiency seriously hinders the application of Boron (B) powder as metal fuel in solid propellants. To overcome this issue, a series of B-based spherical composites were produced by encapsulating B based metastable intermixed composites (MICs) with ammonium perchlorate (AP) by a solvent evaporation induced self-assembly (EISA) method in this work. A self-developed combustion system containing an ignition pool, indicator light, and high-speed camera to precisely monitor ignition delay and burning times was utilized. The EISA-prepared B/Bii(2)O(3)/AP spherical composites showed higher combustion temperature (1435 ?) and shorter ignition delay time (379 & PLUSMN;25 ms) than the physically mixed sample (1264 ? and 1035 & PLUSMN;63 ms). The isolated reaction units of spherical B/Bi2O3/AP composite accelerated heat transfer and accumulation and reduced sintering and agglomeration, thus promoting the combustion efficiency of B powder. This study presents a promising strategy by doping and encapsulating process to increase the combustion performance of B-based metal fuel.

关键词： Boron-based Energetic Composites Encapsulated Structure EISA Method Combustion Performance Reaction Mechanism

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Highly sensitive detection of rabbit IgG by electron spin resonance using CuS nanoparticles as probe

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SENSORS AND ACTUATORS B-CHEMICAL 2021年 338卷 129835-129835页

作者： Tian, Sizhu Li, xuwen Jiang, Jia Tang, Li zhang, Hanqi Yu, Yong zhang, Ziwei Jilin Univ Coll Chem Qianjin St 2699 Changchun 130012 Peoples R China Jilin Univ Coll Instrumentat & Elect Engn West Minzhu St 938 Changchun 130061 Peoples R China

Water soluble copper sulfide (CuS) nanoparticles were synthesized using L-cysteine as the ligand. Multiple biotins were conjugated to the antibody of rabbit IgG, and the streptavidin was attached to the CuS nanoparticles. The Cu2+ ions enclosed in the nanoparticles were used as the electron spin resonance (ESR) probes and detected with ESR spectrometer. The immunoassay reaction was resulted in the formation of the coating antibody attached to the microplate well, the detecting antibody labeled with the biotins, and the streptavidin attached to the CuS nanoparticles. After the immunoassay reaction was performed, large amount of Cu2+/Cu+ ions inside the nanoparticles were released with the help of diethyldithiocarbamate (DDC) and the Cu2+-DDC complex formed. The Cu2+-DDC complex was extracted into n-butanol, which was used as the analytical sample. Both ESR and UV?vis signals were collected for the analytical sample. The double logarithm standard curve was well simulated with a linear regression equation. The limits of detection of the rabbit IgG were 1.76 pg/mL and 2.36 pg/mL by ESR and UV?vis method, respectively. The detection range using ESR as the detector was from 8.8 pg/mL to 500 ng/mL, covering almost 5 magnitude orders of the rabbit IgG concentrations. The rabbit serum was analyzed and the rabbit IgG concentration was found to be 7.76 mg/mL. The reproducibility of the present method was good enough with the intra-assay error within 3.4 % and the inter-assay error within 11.2 %. The spiked serum samples were analyzed and the experimental results indicated that the recoveries were from 108.2 to 113.7%.

关键词： CuS nanoparticles Electron spin resonance Immunoassay Cu2+-DDC complex Rabbit IgG

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FETAL TYPE CLASSIFICATION BASED ON FETAL ELECTROCARDIOGRAPH IN NON-STRESS TESTS

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JOURNAL OF MECHANICS IN MEDICINE AND BIOLOGY 2021年第9期21卷 2140052-2140052页

作者： Liu, Jianli Yang, Yimin zhang, Song Li, xuwen Yang, Lin Hao, Dongmei Beijing Univ Technol Fac Environm & Life Beijing Int Sci & Technol Cooperat Base Intellige Beijing 100024 Peoples R China

Electronic fetal heart rate (FHR) monitoring is a technical means to evaluate the state of the fetus in the uterus by monitoring FHR. The main purpose is to detect intrauterine hypoxia and take corresponding medical measures timely. Because the fetus sleeps quietly for up to 1 hour sometimes, ultrasound Doppler is not easy to continuously detect for a long time. The electronic fetal monitor obtains the fetal heart rate, which not only improves the accuracy and comfort, but also the convenient implementation of long-term monitoring. It is beneficial to reduce perinatal fetal morbidity and mortality. This study used maternal-fetal Holter monitor which is based on the technology of fetal electrocardiograph (FECG) to collect the FHR, and then design algorithm to extract the baseline FHR, acceleration, variation, sleep-wake cycle and nonlinear parameters. There were significant differences in the 22 parameters between the normal and the suspicious group. Using the 22 characteristic parameters, the support vector machine was used to classify the normal and the suspected group of fetuses. 80% of the data was used to train a classification model. The remaining 20% of the data was used as a test set and its accuracy reached 93.75%.

关键词： Fetal Holter monitor fetal heart rate support vector machine

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THE DERIVATION OF THE COMPRESSIBLE EULER EQUATION FROM QUANTUM MANY-BODY DYNAMICS

arXiv

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arXiv 2021年

作者： Chen, xuwen Shen, Shunlin Wu, Jiahao zhang, Zhifei Department of Mathematics University of Rochester RochesterNY14627 United States School of Mathematical Sciences Peking University Beijing100871 China

We study the three dimensional many-particle quantum dynamics in mean-field setting. We forge together the hierarchy method and the modulated energy method. We prove rigorously that the compressible Euler equation is the limit as the particle number tends to infinity and the Planck's constant tends to zero. We establish strong and quantitative microscopic to macroscopic convergence of mass and momentum densities up to the 1st blow up time of the limiting Euler equation. We justify that the macroscopic pressure emerges from the space-time averages of microscopic interactions, which are in fact, Strichartz-type bounds. We have hence found a physical meaning for Strichartz type bounds which were first raised by Klainerman and Machedon in this context. Copyright © 2021, The Authors. All rights reserved.

关键词： Euler equations

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Efficient advanced treatment of coking wastewater using O3/H2O2/Fe-shavings process

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JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 2022年第2期10卷

作者： Yuan, Run Xia, Yu Wu, Xu He, Can Qin, Yihe He, Changjun zhang, Xuewei Li, Na He, xuwen China Univ Min & Technol Beijing Dept Chem & Environm Engn Beijing 100083 Peoples R China Beijing Acad Sci & Technol Inst Resources & Environm Beijing 100089 Peoples R China

Catalytic oxidation is widely used in the treatment of refractory wastewater. However, catalytic oxidation has some problems such as high cost and limited production of radicals. To improve these, in this study, a new process of O-3/H2O2/Fe-shavings which coupled catalytic ozonation and Fenton-like oxidation with Fe-shaving wastes reused, was used in the treatment of coking wastewater secondary biochemical effluent (CWSBE). The effects of the environmental conditions on the degradation of CWSBE were studied and the response surface method was used to optimise the parameters. The performances in organic pollutant removal from CWSBE were systematically analysed by a couple of methods such as gas chromatography mass spectrometry and threedimensional fluorescence. The results showed that macromolecular organics were degraded into small molecules pollutants after treatment by the O-3/H2O2/Fe-shavings process. At an ozone concentration of 27.5 mg/L, with the hydrogen peroxide concentration being 10.7 mmol/L, the reaction time 60 min, the initial pH value 3.6, and the pump speed 150 rpm, the COD removal degradation efficiency was 77.5%, and the effluent COD met relevant wastewater discharge standards in China (GB 16171-2012). The mechanism research showed *** plays an important role in the degradation of organic pollutants.

关键词： Advanced oxidation Coking wastewater Response surface method Water quality analysis Degradation mechanism

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煤直接液化过程中供氢溶剂的组成分析

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煤炭转化 2018年第4期41卷 48-55页

作者：王薇舒歌平章序文王洪学高山松中国神华煤制油化工有限公司上海研究院、煤炭直接液化国家工程实验室上海201108

采用色谱质谱联用仪(GC-MS)和傅立叶变换离子回旋共振质谱仪(FT-ICR-MS)鉴定了神华煤直接液化过程中供氢溶剂的主要组成结构.GC-MS检测出100多种化合物,结果表明:供氢溶剂主要由正构烷烃和芳烃化合物组成.芳烃化合物中以氢化芳烃为主,... 详细信息

采用色谱质谱联用仪(GC-MS)和傅立叶变换离子回旋共振质谱仪(FT-ICR-MS)鉴定了神华煤直接液化过程中供氢溶剂的主要组成结构.GC-MS检测出100多种化合物,结果表明:供氢溶剂主要由正构烷烃和芳烃化合物组成.芳烃化合物中以氢化芳烃为主,尤其是四氢萘系列含量最高,达18.19%.FT-ICR-MS结果显示,供氢溶剂的相对分子质量小于550,表明供氢溶剂主要由复杂的小分子化合物组成.负离子ESI(电喷雾电离,electrospray ionization)FT-ICR-MS鉴定出了N1,N2,N1O1,N1O2,O1和O2等多种杂原子类型,正离子ESI FT-ICR-MS鉴定出了CH,N1,N1O1,O1和O2等杂原子类型.供氢溶剂中氢化芳烃化合物和三、四环含杂原子芳烃化合物响应最强,酚类化合物、碱性和非碱性N1类化合物相对丰度最高.

关键词：直接液化供氢溶剂 GC-MS FT-ICR-MS 分子组成

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