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Application of activated carbon derived from scrap tires for adsorption of Rhodamine B

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Journal of Environmental Sciences 2010年第8期22卷 1273-1280页

作者： Li Li shuangxi liu Tan Zhu Institute of New Catalytic Materials Science College of Chemistry Nankai University Tianjin 300071 China College of Environmental Science and Engineering Nankai University Tianjin 300071 China

Activated carbon derived from solid hazardous waste scrap tires was evaluated as a potential adsorbent for cationic dye removal. The adsorption process with respect to operating parameters was investigated to evaluate the adsorption characteristics of the activated pyrolytic tire char （APTC） for Rhodamine B （RhB）. Systematic research including equilibrium, kinetics and thermodynamic studies was performed. The results showed that APTC was a potential adsorbent for RhB with a higher adsorption capacity than most adsorbents. Solution pH and temperature exert significant influence while ionic strength showed little effect on the adsorption process. The adsorption equilibrium data obey Langmuir isotherm and the kinetic data were well described by the pseudo second-order kinetic model. The adsorption process followed intra-particle diffusion model with more than one process affecting the adsorption process. Thermodynamic study confirmed that the adsorption was a physisorption process with spontaneous, endothermic and random characteristics.

关键词： activated pyrolytic tire char Rhodamine B adsorption isotherm thermodynamics

APPLICATION OF FUZZY SET THEORY IN FAULT TREE ANALYSIS

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Chinese Journal of Mechanical Engineering 1998年第4期11卷 79-85页

作者： Huo, Ying Hou, Chaozhen liu, shuangxi Beijing Inst of Technology Beijing China

Based on the fuzzy set theory and the expand principle, using fuzzy number as the boundary condition of fault tree analysis, a new method of analyzing fuzzy fault probability of the top event is developed. Fuzzy importance analysis of the basic event is proposed as well. A practical example is given. This method is a new way to solve the obscure problems of fault tree analysis and has great value in engineering practice.

关键词： Fuzzy number Fault tree Reliability analysis

Spontaneous migration induced Co nanokarstcave encapsulated in N-doped carbon hybrids for efficient oxygen electrocatalyst

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Nano Research 2021年第12期14卷 4569-4576页

作者： Xuemin Wang Ming liu Hang Zhang Sihao Yan Cui Zhang shuangxi liu School of Materials Science and Engineering Institute of New Catalytic Materials ScienceNankai UniversityTianjin300350China National Institute for Advanced Materials Nankai UniversityTianjin300350China Key Laboratory of Advanced Energy Materials Chemistry Ministry of EducationNankai UniversityTianjin300071China Collaborative Innovation Center of Chemical Science and Engineering Tianjin300072China

Despite the extensive application of porous nanostructures as oxygen electrocatalysts, it is challenging to synthesize single-metal state materials with porous structures, especially the ultrasmall ones due to the uniform diffusion of the same metal. Herein, we pioneer demonstrate a new size effect-based controllable synthesis strategy for the homogeneous Co nanokarstcaves assisted by Co-CN hybrids (CCHs). The preferential migration of cobalt atoms on the surface of small size zeolitic imidazolate framework (ZIF) with high surface energy during pyrolysis is the key factor for the formation of nanokarstcave structure. Furthermore, graphene can act as a diffusion barrier to prevent the agglomeration of nanoparticles in the synthesis process, which also plays an important role in the formation of porous nanostructures. In alkali media, CCHs achieve overpotential of 287 mV (@10 mA·cm^(−2)) for oxygen evolution reaction (OER) and a half wave potential of 0.86 V (vs. RHE) for oxygen reduction reaction (ORR).

关键词： size effect spontaneous migration Co nanokarstcave oxygen electrocatalyst multicomponent synergy

Current status and prospects of terminal guidance laws for intercepting hypersonic vehicles in near space:a review

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第5期24卷 387-403页

作者： shuangxi liu Binbin YAN Wei HUANG Xu ZHANG Jie YAN Unmanned System Research Institute Northwestern Polytechnical UniversityXi'an 710072China School of Astronautics Northwestern Polytechnical UniversityXi'an 710072China Science and Technology on Scramjet Laboratory School of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China

The unique performance advantages of hypersonic vehicles represent a critical challenge for existing defense *** facilitate defensive operations against hypersonic vehicles in near space,this paper systematically discusses both the advantages of these vehicles and the difficulties in intercepting *** on the state-of-the-art terminal guidance laws for intercepting hypersonic vehicles in near space,we examine research progress in the area of single-and multi-interceptor cooperative guidance laws and summarize their advantages and *** also highlight future research directions for developing an effective terminal guidance law for multi-interceptor cooperative interception of hypersonic vehicles,based on four aspects:the information domain,space domain,physical domain,and effect-cost *** findings provide a reference for further research into near-space interceptor terminal guidance technologies.

关键词： Hypersonic vehicles Guidance law Cooperative guidance Near space

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控释肥颗粒群仿真接触参数标定与试验

农业机械学报 2024年第6期55卷 80-90页

作者：张宏建陈修波李宏立田园范国强许珺烁刘双喜王金星山东农业大学机械与电子工程学院泰安271018 山东省农业装备智能化工程实验室泰安271018 山东省园艺机械与装备重点实验室泰安271018

接触参数影响控释肥颗粒离散元仿真结果。为了精准模拟控释肥颗粒力学行为与运动规律,本文基于离散元法对控释肥颗粒的接触参数进行标定与试验。首先,建立控释肥离散元基础模型,并利用台架和仿真试验相结合的方法,在EDEM中对控释肥颗粒... 详细信息

接触参数影响控释肥颗粒离散元仿真结果。为了精准模拟控释肥颗粒力学行为与运动规律,本文基于离散元法对控释肥颗粒的接触参数进行标定与试验。首先,建立控释肥离散元基础模型,并利用台架和仿真试验相结合的方法,在EDEM中对控释肥颗粒与PVC板之间接触参数进行标定。其次,通过碰撞弹跳试验、斜面滑移试验和斜面滚动试验测得控释肥颗粒与PVC板之间的碰撞恢复系数、静摩擦因数和滚动摩擦因数分别为0.539、0.507和0.105。最后,通过堆积试验、最陡爬坡试验和正交旋转组合试验,得到控释肥颗粒间的碰撞恢复系数、静摩擦因数和滚动摩擦因数分别为0.38、0.25和0.09,并通过无底圆筒提升试验和排肥台架试验进行验证。试验结果表明,堆积角实际值与仿真结果的相对误差为1.54%,排肥量实际值与仿真结果4种转速下的相对误差分别为4.38%、4.23%、4.41%、4.36%,所标定的控释肥接触参数精准有效,可为控释肥离散元仿真提供数据和模型支撑。

关键词：控释肥离散元法接触参数标定试验堆积角

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基于形色筛选的苹果园羽化害虫粘连图像分割方法

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农业机械学报 2024年第3期55卷 263-274页

作者：刘双喜王云飞张宏建孙林林马博慕君林任卓王金星山东农业大学机械与电子工程学院泰安271018 山东省农业装备智能化工程实验室泰安271018 山东省园艺机械与装备重点实验室泰安271018

针对苹果园害虫识别过程中的粘连问题,提出了一种基于形色筛选的害虫粘连图像分割方法。首先,采集苹果园害虫图像,聚焦于羽化害虫。害虫在羽化过程中已完成大部分生长发育,其外部形态、颜色、纹理更为稳定显著。因此,基于不同种类害虫... 详细信息

针对苹果园害虫识别过程中的粘连问题,提出了一种基于形色筛选的害虫粘连图像分割方法。首先,采集苹果园害虫图像,聚焦于羽化害虫。害虫在羽化过程中已完成大部分生长发育,其外部形态、颜色、纹理更为稳定显著。因此,基于不同种类害虫的形色特征信息分析,来获取害虫HSV分割阈值和模板轮廓。其次,利用形状因子判定分割粘连区域,通过颜色分割法和轮廓定位分割法来实现非种间与种间粘连害虫的分割。最后,对采集的苹果园害虫图像进行了试验分析,采用基于形色筛选的分割法对单个害虫进行分割,结果表明,本文方法的平均分割率、平均分割错误率和平均分割有效率分别为101%、3.14%和96.86%,分割效果优于传统图像分割方法。此外,通过预定义的颜色阈值,本文方法实现了棉铃虫、桃蛀螟与玉米螟的精准分类,平均分类准确率分别为97.77%、96.75%与96.83%。同时,以Mask R-CNN模型作为识别模型,平均识别精度作为评价指标,分别对已用本文方法和未用本文方法分割的害虫图像进行识别试验。结果表明,已用本文方法分割的棉铃虫、桃蛀螟和玉米螟害虫图像平均识别精度分别为96.55%、94.80%与95.51%,平均识别精度分别提高16.42、16.59、16.46个百分点。这表明该方法可为果园害虫精准识别提供理论和方法基础。

关键词：苹果园羽化害虫粘连图像精准分割形色特征轮廓定位

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ZnFe_(2)O_(4)/BiVO_(4)Z-scheme heterojunction for efficient visible-light photocatalytic degradation of ciprofloxacin

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1728-1740页

作者： Beibei Wang Kejiang Qian Weiping Yang Wenjing An Lan-Lan Lou shuangxi liu Kai Yu MOE Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Technology for Complex Transmedia PollutionCollege of Environmental Science and EngineeringNankai UniversityTianjin 300350China Institute of New Catalytic Materials Science School of Materials Science and EngineeringNational Institute of Advanced MaterialsNankai UniversityTianjin 300350Chin

A novel Z-scheme ZnFe_(2)O_(4)/BiVO_(4)heterojunction photocatalyst was successfully synthesized using a convenient solvothermal method and applied in the visible light photocatalytic degradation of ciprofloxacin,which is a typical antibiotic contaminant in *** heterostructure of as-synthesized catalysts was confirmed using X-ray diffraction,scanning electron microscopy,transmission electron microscopy and X-ray photoelectron spectroscopy *** with the singlephase counterparts,ZnFe_(2)O_(4)/BiVO_(4)demonstrated considerably enhanced photogenerated charge separation efficiencies because of the Z-scheme transfer mechanism of electrons between the composite ***,the 30%ZnFe_(2)O_(4)/BiVO_(4)catalyst afforded a degradation rate of up to 97%of 20 mg/L ciprofloxacin under 30 min of visible light irradiation with a total organic carbon removal rate of 50%,which is an excellent activity compared with ever reported BiVO_(4)-based *** addition,the liquid chromatography-mass spectrometry and quantitative structure-activity relationships model analyses demonstrated that the toxicity of the intermediates was lower than that of the parent ***,the as-synthesized ZnFe_(2)O_(4)/BiVO_(4)heterojunctions were quite stable and could be reused at least four *** study thus provides a promising Z-scheme heterojunction photocatalyst for the efficient removal and detoxication of antibiotic pollutants from wastewater.

关键词： ZnFe_(2)O_(4)/BiVO_(4) Z-scheme heterojunction photocatalytic degradation ciprofloxacin

Superior performance in visible-light-driven hydrogen evolution reaction of three-dimensionally ordered macroporous SrTiO_(3) decorated with Zn_(x)Cd_(1−x)S

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Frontiers of Chemical Science and Engineering 2021年第6期15卷 1561-1571页

作者： Huiying Quan Kejiang Qian Ying Xuan Lan-Lan Lou Kai Yu shuangxi liu MOE Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Technology for Complex Transmedia PollutionCollege of Environmental Science and EngineeringNankai UniversityTianjin300350China Institute of New Catalytic Materials Science and MOE Key Laboratory of Advanced Energy Materials Chemistry School of Materials Science and EngineeringNational Institute of Advanced MaterialsNankai UniversityTianjin300350China

It is of broad interest to develop emerging photocatalysts with excellent light-harvesting capacity and high charge carrier separation efficiency for visible light photocatalytic hydrogen evolution ***,achieving satisfying hydrogen evolution efficiency under noble metal-free conditions remains *** this study,we demonstrate the fabrication of three-dimensionally ordered macroporous SrTiO_(3)decorated with Zn_(x)Cd_(1−x)S nanoparticles for hydrogen production under visible light irradiation(λ>420 nm).Synergetic enhancement of photocatalytic activity is achieved by the slow photon effect and improved separation efficiency of photogenerated charge *** obtained composites could afford very high hydrogen production efficiencies up to 19.67 mmol·g^(−1)·h^(−1),with an apparent quantum efficiency of 35.9%at 420 nm,which is 4.2 and 23.9 times higher than those of pure Zn_(0.5)Cd_(0.5)S(4.67 mmol·g^(−1)·h^(−1))and CdS(0.82 mmol·g^(−1)·h^(−1)),*** particular,under Pt-free conditions,an attractive hydrogen production rate(3.23 mmol·g^(−1)·h^(−1))was achieved,providing a low-cost and high-efficiency strategy to produce hydrogen from water ***,the composites showed excellent stability,and no obvious loss in activity was observed after five cycling tests.

关键词： three-dimensionally ordered macroporous SrTiO_(3) Zn_(x)Cd_(1−x)S visible light hydrogen production promotion mechanism

Preparation of Fe_x Ce_(1-x) O_y solid solution and its application in Pd-only three-way catalysts

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Journal of Environmental Sciences 2012年第4期24卷 757-764页

作者： Jianqiang Wang Meiqing Shen Jun Wang Mingshan Cui Jidong Gao Jie Ma shuangxi liu Key Laboratory for Green Chemical Technology of State Education Ministry School of Chemical Engineering&TechnologyTianjin UniversityTianjin 300072China China Automotive Jechnology&Research Center Tianyin 300162China State Key Laboratory of Engines Tianjin Universitylianjin 300072China

FeOx-CeO2 mixed oxides with increasing Fe/（Ce＋Fe） atomic ratio （1-20 mol%） were prepared by sol-gel method and characterized by X-ray powder diffraction （XRD）, Brunauer-Emrnett-Teller （BET） and Hydrogen temperature-programmed reduction （H2-TPR） techniques. The dynamic oxygen storage capacity （DOSC） was investigated by mass spectrometry with CO/O2 transient pulses. The powder XRD data following Rietveld refinement revealed that the solubility limit of iron oxides in the CeO2 was 5 mol% based on Fe/（Ce＋Fe）. The lattice parameters experienced a decrease followed by an increase due to the influence of the maximum solubility limit of iron oxides in the CeO2. TPR analysis revealed that Fe introduction into ceria strongly modified the textual and structural properties, which influenced the oxygen handling properties. DOSC results revealed that Ce-based materials containing Fe oxides with multiple valences contribute to the majority of DOSC. The kinetic analysis indicated that the calculated apparent kinetic parameters obey the compensation effect. The three-way catalytic performance for Pd-only catalysts based on the Fe doping support exhibited the redundant iron species separated out of the CeO2 and interacted with the ceria and Pd species on the surface, which seriously influenced the catalytic properties, especially after hydrothermal aging treatment.

关键词： FeOx-CeO2 solubility limit dynamic oxygen storage/release capacity three-way catalytic performance