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Investigation of Al2O3 and Fe2O3 transmission and transformation during the decomposition of phosphogypsum

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Chinese Journal of Chemical Engineering 2019年第5期27卷 1125-1131页

作者： Jie Yang Bin Zhu Liping Ma Hongpan Liu Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China School of Environmental Science & Engineering Huazhong University of Science & TechnologyWuhan 430074China College of materials and Chemical Engineering Chongqing University of Arts and SciencesChongqing 402160China

Phosphogypsum(PG) is a solid waste produced in the phosphate fertilizer industry and is environmentally harmful.The decomposition of PG to recycle calcium and sulfur is a proper way to reutilize PG. Current work aims at enriching the basic theory of coal decomposition process of PG. The emphasis was laid on the exploration of impact of main impurities on the process. On the other hand, according to Reaction Module, Equilib Module, and Phase Diagram Module of FactS age, the simulation computation was done on the systems of pure gypsum mixed with coal,with or without impurities for avoiding other impurities interference. Later, possible reactions in the process were deduced. Additionally, experiments were conducted in a TG-DTA integrated thermal gravimetric analyzer and a tube furnace. The products from the experiments were characterized and analyzed to verify the accuracy of theoretical calculations. The results showed that these impurities can change the decomposition process of PG. For example, aluminum oxide was transformed to calcium sulfoaluminate, while iron oxide was transformed to dicalcium ferrite. Furthermore, the results help to further improve the basic theory of phosphogypsum decomposition.

关键词： Phosphogypsum Reductive decomposition Simulation calculations Aluminum oxide Iron oxide Ternary diagram

Experimental and numerical simulation of lignite chemical looping gasification with phosphogypsum as oxygen carrier in a fluidized bed

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Chinese Journal of Chemical Engineering 2021年第9期34卷 197-207页

作者： Wang Du Liping Ma Jing Yang Wei Zhang Ran Ao Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710000China

Phosphogypsum(PG)is a solid waste produced in the wet process of producing phosphoric acid.Lignite is a kind of promising chemical raw material.However,the high sulfur of lignite limits the utilization of lignite as a resource.Based on fluidized bed experiments,the optimal reaction conditions for the production syngas by lignite chemical looping gasification(CLG)with PG as oxygen carrier were studied.The study found that the optimal reaction temperature should not exceed 1123 K;the mole ratio of water vapor to lignite should be about 0.2;the mole ratio of PG oxygen carrier to lignite should be about 0.6.Meanwhile,commercial software Comsol was used to establish a fuel reaction kinetics model.Through computational fluid dynamics(CFD)numerical simulation,the process of reaction in fluidized bed were well captured.The model was based on a two-fluid model and coupled mass transfer,heat transfer and chemical reactions.This study showed that the fluidized bed presents a flow structure in which gas and solid coexist.There was a high temperature zone in the middle and lower parts of the fluidized bed.It could be seen from the results of the flow field simulated that the fluidized bed was beneficial to the progress of the gasification reaction.

关键词： Phosphogypsum Lignite Chemical looping gasification Fluidized-bed Syngas Computational fluid dynamics

Taming quantum dots’nucleation and growth enables stable and efficient blue-light-emitting devices

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Photonics Research 2022年第10期10卷 2359-2365页

作者： ZHIWEI ma JUNXIA HU liping TANG BINGBING LYU Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory for Special Functional materials of the Ministry of Education Henan UniversityKaifeng 475004China School of Information Engineering Xinyang Agriculture and Forestry UniversityXinyang 464000China Department of Physics South University of Science and TechnologyShenzhen 518055China

Controlling quantum dots’emission,nanostructure,and energy level alignment to achieve stable and efficient blue emission is of great significance for electroluminescence devices but remains a challenge.Here,a series of blue ZnCdSeS/ZnS quantum dots was optimized in preparation by taming their nucleation and growth kinetics.Controlling anion precursor reactive properties to modulate quantum dots’nucleation and growth tailors their alloy core and continuous gradient energy band nanostructure.These results not only elevate the thermal stability of blue quantum dots but also further enhance the injection/transportation of carriers and improve the radiative recombination efficiency in the device.The blue ZnCdSeS/ZnS quantum dots applied in light-emitting devices show superior performance,including maximum current efficiency and external quantum efficiency of,respectively,8.2 cd/A and 15.8%for blue,2.6 cd/A and 10.0%for blue-violet,and 10.9 cd/A and 13.4%for sky-blue devices.The blue and sky-blue devices exhibit lifetimes of more than 10,000 h.The proposed methodology for tailoring quantum dots is expected to pave new guidelines for further facilitating visible optoelectronic device exploration.

关键词： quantum blue enable

A power and thermal management system for long endurance hypersonic vehicle

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Chinese Journal of Aeronautics 2023年第2期36卷 29-40页

作者： Liang GUO liping PANG Xiaodong YANG Jingquan ZHAO Desheng ma School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Institute of Artificial Intelligence Beihang UniversityBeijing 100191China

Due to the pneumatic heating and combustion effect,the scramjet engine of hypersonic vehicle faces high temperature challenge.It is necessary to comprehensively consider its thermal management and power generation together.A new Power and Thermal management System(PTMS)combined with Supercritical Carbon Dioxide(SCO_(2))closed Brayton cycle and fuel vapor turbine is proposed and discussed in this paper.The new PTMS can meet the cooling requirement of hypersonic vehicle at mach number 6–7,and avoid the coking and scrapping in the scramjet cooling channels.Compared with the PTMS only based on fuel vapor turbine,the new PTMS utilizes the waste heat of scramjet to generate more electricity.In addition,it can reduce the use of fuel sink for cooling,and the additional weight penalty can be compensated for long endurance hypersonic flight.

关键词： Fuel vapor turbine Hypersonic vehicle Power and thermal management system Scramjet Supercritical carbon dioxide

Catalytic reduction for water treatment

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Frontiers of Environmental Science & Engineering 2018年第1期12卷 25-42页

作者： maocong Hul Yin Liu Zhenhua Yaol Liping Ma Xianqin Wang . Department of Chemical Biological and Pharmaceutical Engineering New Jersey Institute of Technology Newark NJ 07102 USA.. Primus Green Energy Hillsborough NJ 08844 USA.. Oil & Gas Technology Research Institute of Changqing Oilfield Company Xi’an 710018 China

Treating water contaminants via heterogeneously catalyzed reduction reaction is a subject of growing interest due to its good activity and superior selectivity compared to conventional technology, yielding products that are non-toxic or substantially less toxic. This article reviews the application of catalytic reduction as a progressive approach to treat different types of contaminants in water, which covers hydrodehalogenation for wastewater treatment and hydrogenation of nitrate/nitrite tbr groundwater remediation. For hydrodehalogenation, an overview of the existing treatment technologies is provided with an assessment of the advantages of catalytic reduction over the conventional methodologies. Catalyst design for feasible catalytic reactions is considered with a critical analysis of the pertinent literature. For hydrogenation, hydrogenation of nitrate/nitrite contaminants in water is mainly focused. Several important nitrate reduction catalysts are discussed relating to their preparation method and catalytic performance. In addition, novel approach of catalytic reduction using in situ synthesized H2 evolved from water splitting reaction is illustrated. Finally, the challenges and perspective tbr the extensive application of catalytic reduction technology in water treatment arc discussed. This review provides key information to our community to apply catalytic reduction approach for water treatment.

关键词： Halogenated compoundsNitrate/nitrite contaminantsHydrodechloriantionHydrogenationWastewater treatmentGroundwater remediation

俄语空间意义形容词语义衍生的认知隐喻模式分析

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外语研究 2023年第5期40卷 43-49页

作者：马丽萍黑龙江大学中俄学院黑龙江哈尔滨150080

认知隐喻模式是形容词多义关系语义衍生的核心机制和重要原则,厘清认知隐喻模式的运作方式和次分类范畴或具体模式、运作特点对于探讨形容词多义义项的内在联系和衍生路径极为重要。本文以俄语空间意义形容词为分析对象,重点对其语义衍... 详细信息

认知隐喻模式是形容词多义关系语义衍生的核心机制和重要原则,厘清认知隐喻模式的运作方式和次分类范畴或具体模式、运作特点对于探讨形容词多义义项的内在联系和衍生路径极为重要。本文以俄语空间意义形容词为分析对象,重点对其语义衍生中的结构隐喻、方位隐喻、本体隐喻以及复合隐喻模式展开研究,同时对其语义衍生的认知加工过程和认知操作方式进行讨论。相关研究有助于从认知模式层面深入考察形容词语义变化的运作特点与机理,揭示语言意义的创造性思维同认知活动、认知隐喻机制之间的实质关联。

关键词：空间意义形容词语义衍生隐喻模式认知隐喻

Distinct roles of pH and organic ligands in the dissolution of goethite by cysteine

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Journal of Environmental Sciences 2022年第3期34卷 260-268页

作者： Ji Li Chenlu Shi Wenbin Zeng Yaru Wang Zebin Hong Yibing ma liping Fang Faculty of material Sciences and Chemistry China University of GeosciencesWuhan 430074China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and management Institute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangzhou 520650China macao Environmental Research Institute Macao University of Science and TechnologyTaipa 999078MachaoChina

Electron shuttles such cysteine play an important role in Fe cycle and its availability in soils,while the roles of pH and organic ligands in this process are poorly understood.Herein,the reductive dissolution process of goethite by cysteine were explored in the presence of organic ligands.Our results showed that cysteine exhibited a strong reactivity towards goethite-a typical iron minerals in paddy soils with a rate constant ranging from 0.01 to0.1 hr^(-1).However,a large portion of Fe(Ⅱ) appeared to be "structural species" retained on the surface.The decline of pH was favorable to generate more Fe(Ⅱ) ions and enhancing tendency of Fe(Ⅱ) release to solution.The decline of generation of Fe(Ⅱ) by increasing pH was likely to be caused by a lower redox potential and the nature of cysteine pH-dependent adsorption towards goethite.Interestingly,the co-existence of oxalate and citrate ligands also enhanced the rate constant of Fe(Ⅱ) release from 0.09 to 0.15 hr-1;nevertheless,they negligibly affected the overall generation of Fe(Ⅱ) in opposition to the pH effect.Further spectroscopic evidence demonstrated that two molecules of cysteine could form disulfide bonds(S-S) to generate cystine through oxidative dehydration,and subsequently,inducing electron transfer from cysteine to the structural Fe(Ⅲ) on goethite;meanwhile,those organic ligands act as Fe(Ⅱ) "strippers".The findings of this work provide new insights into the understanding of the different roles of pH and organic ligands on the generation and release of Fe induced by electron shuttles in soils.

关键词： Electron transfer Reductive dissolution Iron cycling Organic ligands

Mechanisms of melatonin in anti-aging and its regulation effects in radiation-induced premature senescence

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Radiation Medicine and Protection 2021年第1期2卷 33-37页

作者： Liping Ma Qingjie Liu Mei Tian Xuelei Tian Ling Gao Key Laboratory of Radiation Protection and Nuclear Emergency China CDCNational Institute for Radiological ProtectionChinese Center for Disease Control and PreventionBeijing100088China

Melatonin is an effective antioxidant hormone produced mainly by the pineal gland.Premature senescence refers to senescence induced by declined cell proliferation and physiological functions when cells are stimulated by nontelomeric signals.The anti-aging effect of melatonin is exerted by upregulating the expression of silent information regulator 1/Sirtuin 1(SIRT1),which reduces oxidative stress damage,decreases p53 activation,and inhibits the NF-κB pathway.Radiation can induce premature senescence through direct or indirect oxidative stress damage.The mechanism by which melatonin regulates radiation-induced premature senescence includes the inhibition of the p53-mediated senescence pathway through elimination of reactive oxygen species or p53 deacetylation induced by upregulation of SIRT1 expression.Melatonin exhibits different regulatory effects for different cells and types of radiation.

关键词： Melatonin Premature senescence Anti-aging Radiation p53

The decrease of salinity in lakes on the Tibetan Plateau between 2000 and 2019 based on remote sensing model inversions

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International Journal of Digital Earth 2023年第1期16卷 2644-2659页

作者： Chong Liu liping Zhu Junbo Wang Jianting Ju Qingfeng ma Qiangqiang Kou State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijingPeople’s Republic of China Piesat Information Technology Co. Ltd.BeijingPeople’s Republic of China University of Chinese Academy of Sciences BeijingPeople’s Republic of China

Salinity is an essential factor of lake water environments and aquatic systems.It is also sensitive to climatic changes and human activities based on concentration variations of solved minerals.However,there are few consecutively temporal studies on lake salinity variations on the Tibetan Plateau because the harsh environmental conditions make it diffcult to carry out in-situ observations for several lakes.In this study.we constructed a remote sensing retrieval model for lake salinity based on 87 in-situ lake investigations;moreover,interannual lake salinity and associated variations from 152 lakes larger than 50 km2 were analyzed on the Tibetan Plateau.A significant decreasing trend in lake salinity was observed between 2000 and 2019(pmanagement efficacy of water resources.

关键词： Optical remote sensing Tibetan Plateau lakes climate change salinity