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Behavior of sulfate in preparation of single light rare earth carbonate by Mg(HCO_(3))_(2) precipitation method

Journal of rare earths 2021年第7期39卷 850-857,I0004页

作者： Meng Wang Xiaowei Huang Zongyu Feng Chao Xia Deliang Meng Zonghe Yu national engineering research Center for rare earth materials GRINM Group Co.Ltd.Beijing 100088China GRIREM Advanced materials Co. Ltd.Beijing 100088China General research Institute for Nonferrous Metals Beijing 100088China rare earth functional materials(Xiong'an)Innovation Center Co. Ltd.Baoding 071700China

The precipitation of the water-leaching solution of Baotou mixed rare earth(RE) concentrate roasted with sulfuric acid using ammonium bicarbonate for producing RE carbonate produces a mass of ammonia-nitrogen wastewater because of the relatively low solubility of rare earth *** solve the serious problem of ammonia-nitrogen pollution,new precipitators need to be developed urgently so as to meet the requirements of environmental protection and impurities content of the product(SO_(4)^(2-)<1.8 wt% in RE carbonates products).In this paper,we studied the effects of feeding modes on the behavior of SO_(4)^(2-) during the preparation of light RE carbonate(RE=La,Ce,Pr,Nd) from their sulfate solutions using Mg(HCO_(3))_(2) as a *** results indicate that the contents of SO_(4)^(2-) in the La and Ce precipitates using positive feeding mode exceed 16 wt% because of the formation of La_(2)(CO_(3))2.15(-SO_(4))0.85·4 H_(2)O and Ce_(2)(CO_(3))_(2).15(SO_(4))0.85·3H_(2)O,while those of the Pr and Nd precipitates are 4 wt%-5 wt% since they exist in the form of *** precipitates prepared using synchronous feeding mode are all RE carbonate with only 4 wt%-5 wt% of SO_(4)^(2-) enclosed in the *** content of SO_(4)^(2-) in the RE carbonate obtained using reverse feeding mode is the *** them,the content of SO_(4)^(2-) in La precipitate is only 1.40 wt%.Both synchronous and reverse feeding modes can effectively reduce the content of SO_(4)^(2-)in RE carbonate,which provides theoretical guidance for the preparation of qualified light RE carbonate products by Mg(HCO3)2 precipitation method.

关键词： rare earth sulfate Magnesium bicarbonate rare earth carbonate Sulfate ion Complex salt

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Extraordinary simultaneous enhancement of the coercivity and remanence of dual alloy HRE-free Nd-Fe-B sintered magnets by post-sinter annealing

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Journal of materials Science & Technology 2022年第11期106卷 236-242页

作者： Qingfang Huang Qingzheng Jiang Jifan Hu Sajjad Ur Rehman Gang Fu Qichen Quan Jixiang Huang Deqin Xu Dakun Chen Zhenchen Zhong Jiangxi Key Laboratory for rare earth Magnetic materials and Devices&College of rare earths Jiangxi University of Science and TechnologyGanzhou 341000China Fujian Key Laboratory for rare earth functional materials Longyan 366300China School of materials Science and engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

Post-sinter annealing process plays an important role in the microstructures and magnetic properties of the Nd-Fe-B sintered *** this paper,systematically investigated are the magnetic properties and microstructures of the as-sintered and post-sinter annealed Nd-Fe-B magnets with Pr-Fe-Ga boundary *** choice consecutive annealing methods are adopted at high and low temperatures,namely the 1 st annealing at 880℃ for 2 h and then the 2^(nd) annealing at 440℃ for 3 *** is exceptional to find out that both the remanence and coercivity are improved after 2^(nd) annealing process for this type of *** coercivity is hugely increased from 10.09 kOe for the as-sintered sample to 17.19 kOe for the 2^(nd) annealed magnet,with a significant increment of 70.37%in *** extraordinary magnetic properties of B_(r)=14.44 kGs,H_(cj)=17.19 kOe and(BH)_(max)=51.08 MGOe are obtained for the designated Nd-Fe-B sintered magnets without heavy rare earth(HRE)elements manufactured by dual alloy *** Curie temperature is monotonically decreased from 634 K to 602 K while the c-axis alignment degree is optimized after *** observation and analysis indicate that the elemental distribution patterns are altered after the 2^(nd) *** diffusion of the aggregate(Pr,Nd,Cu,Ga)-rich phase from triple junctions into the grain boundary regions is ascribed to the formation of thin and continuous grain boundary layer,which is critical to improve the microstructures and magnetic properties.

关键词： Nd-Fe-B sintered magnets HRE-free Dual alloy method Post-sinter annealing Magnetic properties

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Pillar effect induced by ultrahigh phosphorous/nitrogen doping enables graphene/MXene film with excellent cycling stability for alkali metal ion storage

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Journal of Energy Chemistry 2024年第6期93卷 146-156,I0004页

作者： Meng Qin Yiwei Yao Junjie Mao Chi Chen Kai Zhu Guiling Wang Dianxue Cao Jun Yan Key Laboratory of Superlight materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001HeilongjiangChina Xiamen Key Laboratory of rare earth Photoelectric functional materials and Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021FujianChina

Graphene's large theoretical surface area and high conductivity make it an attractive anode material for potassium-ion batteries(PIBs).However,its practical application is hindered by small interlayer distance and long ion transfer ***,this paper aims to address the issue by introducing MXene through a simple and scalable method for assembling graphene and realizing ultrahigh P doping *** findings reveal that MXene and P-C bonds have a "pillar effect" on the structure of graphene,and the P-C bond plays a primary *** addition,N/P co-doping introduces abundant defects,providing more active sites for K^(+) storage and facilitating K^(+) *** expected,the developed ultrahigh phosphorous/nitrogen co-doped flexible reduced graphene oxide/MXene(NPrGM) electrode exhibits remarkable reversible discharge capacity(554 mA hg^(-1) at 0.05 A g^(-1)),impressive rate capability(178 mA h g^(-1) at 2 A g^(-1)),and robust cyclic stability(0.0005% decay per cycle after 10,000 cycles at 2 A g^(-1)).Furthermore,the assembled activated carbon‖NPrGM potassium-ion hybrid capacitor(PIHC) can deliver an impressive energy density of 131 W h kg^(-1) and stable cycling performance with 98.1% capacitance retention after5000 cycles at 1 A g^(-1).Such a new strategy will effectively promote the practical application of graphene materials in PIBs/PIHCs and open new avenues for the scalable development of flexible films based on two-dimensional materials for potential applications in energy storage,thermal interface,and electromagnetic shielding.

关键词： Graphene MXene Phosphorous doping Pillar effect Potassium-ion batteries

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A study of plasmon-driven catalytic 4-NBT to DMAB in the dry film by using spatial Raman mapping spectroscopy

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Nano research 2022年第7期15卷 6062-6066页

作者： Yansheng Liu Junpeng Deng Zhicheng Jin Tianxing Liu Jin Zhou Feng Luo Guofu Wang School of Microelectronics and materials engineering Guangxi University of Science and TechnologyLiuzhou 545006China Department of Nanoengineering University of California San DiegoLa JollaCA 92093USA Tianjin Key Lab for rare earth materials and Applications Center for Rare Earth and Inorganic Functional MaterialsSchool of Materials Science and Engineering&National Institute for Advanced MaterialsNankai UniversityTianjin 300350China

Plasmon-driven catalytic reaction(PDCR)as a part of photocatalysis has attracted immense *** to the collective oscillation of free electrons at the surface of metallic nanostructures,the charge distributions store energy from the incident light that could transfer energy to molecules that promote *** an environment-friendly and green photocatalysis process,PDCR illustrates a brilliant *** this study,the PDCR efficiency of photo-reducing 4-nitro-benzenthiol(4-NBT)dry film to p,p'-dimercaptoazobenzene(DMAB)in ambient conditions has been studied by using Ag nanodiscs(NDs)and Ag nanoparticles(NPs)as *** distribution of catalytic efficiency of 4-NBT to DMAB using an individual Ag ND catalyst has been illustrated using spatial Raman *** result is direct evidence that the PDCR efficiency has a positive correlation with plasmon-induced electromagnetic field ***,time-dependent surface-enhanced Raman scattering(SERS)experiments reveal that the PDCR of 4-NBT to DMAB is *** discovery in this research will aid to improve the PDCR performance and modulate the catalysis reaction for a high reduction of 4-NBT in industrial.

关键词： plasmon photocatalysis 4-nitro-benzenthiol(4-NBT) surface-enheanced Raman scattering(SERS)

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SO_(4)^(2-)-modified La,Y-doped ceria-zirconia with high oxygen storage capacity and its application in Pd-only three-way catalysts

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Journal of rare earths 2022年第5期40卷 737-744,I0003页

作者： Hao Wang Yongke Hou Yongqi Zhang Meisheng Cui Fang Chen Xiaowei Huang Juanyu Yang Zongyu Feng national engineering research Center for rare earth materials GRINM Group Corporation LimitedBeijing 100088China Grirem Hi-tech Co. Ltd.Langfang 065000China Grirem Advanced materials Co. Ltd.Beijing 100088China rare earth functional materials(Xiong’an)Innovation Center Co. Ltd.Baoding 071700China

As the oxygen redox ability shows great effects on the catalytic performances of ceria-zirconia based materials,many strategies have been utilized to improve the oxygen storage *** in this study,we report a simple and facile approach to prepare a SO_(4)^(2-)-modified La,Y-doped ceria-zirconia material(SO/CZLY-f)with high oxygen storage *** to the additional redox process between SO_(4)^(2-)and S^(2-),oxygen storage capacity of SO/CZLY-f(745.3μmol O_(2)/g)is about 1.6 times higher than that of La,Ydoped ceria-zirconia material without SO_(4)^(2-)***,the catalytic activities and stability of the corresponding Pd-only three-way catalyst were *** to that of Pd@CZLY-f,the operation window of CO,full conversion temperature of HC and NO over Pd@SO/CZLY-f are obviously widened and lowered,*** aging treatment at 1100℃for 4 h,the superiority of aged Pdloading composite is still maintained.

关键词： SO_(4)^(2-)-modified La Y-doped ceria-zirconia Oxygen storage materials Three-way catalytic performances rare earths

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Evaluating the fractionation of ion-adsorption rare earths for in-situ leaching and metallogenic mechanism

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Journal of rare earths 2018年第12期36卷 1333-1341页

作者： Qiuhua Xu Lifeng Yang Dashan Wang Xiao Hou Yuanyuan Sun Xuezhen Zhou Xinmu Zhou Yongxiu Li research Center for rare earths Micro/Nano-Functional Materials Nanchang University College of Environmental and Chemical engineering Nanchang Hangkong University

The fractionation of ion adsorption rare earths(IAREs) along the depth in a shaft of a deposit at Dajishan,Jiangxi, China was comparatively evaluated using the partition values(PVs) and relative fractionation values(RFVs) of the leached rare earths(REs). It is found that both PVs and RFVs can objectively reflect the migration and fractionation of REs, but RE content and abrasion pH could not. However, the RFVs can provide more information to quantitatively evaluating the migration and fractionation characteristics of REs along the selected direction and region than PVs could, which is of significance for designing the optimal procedures of in-situ leaching based on the determined flow direction of injecting solution. It is demonstrated that the migration of Ce, Pr, and Nd along the depth direction is inert, and that of REs post Sm and Y is active. Meanwhile, the migration of La shows region characteristics which is active in the upper and inert in lower region. More interesting, the dependence of RFVs on atomic number of REs displays a tetrad group variation trend. However, the fractionation of REs among clay minerals with different particle sizes is not evident, especially for the clay in the bottom region. These results indicate that the migration and fractionation of REs not only are dominated by the adsorption of their hydrated ions, but also rely on their hydrolysis tendency, which provide information for understanding the metallogenic mechanism of IAREs.

关键词： Ion-adsorption rare earth In-situ leaching Fractionation Metallogenic

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Cerium ions crosslinked sodium alginate-carboxymethyl chitosan spheres with antibacterial activity for wound healing

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Journal of rare earths 2022年第9期40卷 1407-1416,I0003页

作者： Tengfei Ma Xinyun Zhai Yongkang Huang Mengzhen Zhang Pengfei Li Yaping Du Tianjin Key Lab for rare earth materials and Applications Center for Rare Earth and Inorganic Functional MaterialsSchool of Materials Science and EngineeringNational Institute for Advanced MaterialsNankai UniversityTianjin 300350China College of Chemistry Nankai UniversityTianjin 300350China Center for Organic Chemistry Frontier Institute of Science and TechnologyXi'an Jiaotong UniversityXi'an 710054China

For wound healing,wound infection caused by bacteria is one of the important reasons that delay wound healing ***,it is very meaningful to develop a multifunctional wound dressing with antibacterial capability to accelerate wound *** alginate(SA)and carboxymethyl chitosan(CMCS)are the most commonly used compositions in wound dressing,but their poor stability inhibits the further *** CMCS and using cerium ions(Ce^(3+))to crosslink CMCS and SA to form SA-CMCS hybrid spheres by electrostatic spray method,can not only improve the stability of SA hydrogels,but also endow the spheres with excelle nt antibacterial properties due to the characteristics of Ce^(3+).The gradual release of Ce^(3+)from the SA-CMCS spheres can effectively inhibit the growth of Staphylococcus aureus(***)and Escherichia coli(***).Combining the wound healing promotion ability of SA and CMCS,this kind of wound dressing can not only avoid wound infection caused by bacteria effectively,but also accelerate wound healing,thus it is an easily prepared material with potential applications in skin defect repair.

关键词： Cerium ions Sodium alginate Carboxymethyl chitosan Antibacterial activity Wound healing rare earths

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Grain growth behavior and properties of high-entropy pseudobrookite(Mg,Co,Ni,Zn)Ti_(2)O_(5) ceramics

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Journal of Advanced Ceramics 2024年第6期13卷 757-768页

作者： Xiaohui Ma Jinyu Wu Lingyi Meng Jinfeng Zhang Heng Chen Liwen Yan Anran Guo Jiachen Liu Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin 300072China Xiamen Key Laboratory of rare earth Photoelectric functional materials Xiamen Institute of Rare Earth MaterialsHaixi InstitutesChinese Academy of SciencesXiamen 361021China

It is well known that the grain size of high-entropy ceramics is quite small owing to the sluggish diffusion effect. However, abnormal grain growth often occurs in high-entropy pseudobrookite ceramics, ultimately resulting in the formation of many abnormally grown grains with a grain size as large as 50 μm. To study this phenomenon, the grain growth behavior of high-entropy pseudobrookite ceramics was systematically investigated in this paper. The results demonstrate that the starting material powders first react with each other to form a high-entropy intermediate phase and calcined TiO_(2) powders (TiO_(2)-1100 ℃), and then as the sintering temperature increases, the formed high-entropy intermediate phase further reacts with TiO_(2)-1100 ℃ to form high-entropy pseudobrookite ceramics. Thus, in this system, in addition to the sluggish diffusion effect, the grain sizes of the high-entropy intermediate phase and TiO_(2)-1100 ℃ also affect the morphology of high-entropy pseudobrookite. Compared to nanosized TiO_(2), micron-sized TiO_(2) has a lower sintering activity. Therefore, the high-entropy intermediate phases (Mg,Co,Ni,Zn)TiO_(3) and TiO_(2)-1100 ℃ prepared with micron-sized starting materials exhibit lower grain sizes, finally resulting in the formation of high-entropy (Mg,Co,Ni,Zn)Ti_(2)O_(5) with small grain sizes. Moreover, nano-indentation and thermal conductivity tests were carried out on high-entropy (Mg,Co,Ni,Zn)Ti_(2)O_(5) with different morphologies. The results show that the hardness of high-entropy (Mg,Co,Ni,Zn)Ti_(2)O_(5) increases from 6.05 to 9.95 GPa as the grain size increases, whereas the thermal conductivity decreases from 2.091±0.006 to 1.583±0.006 W·m^(−1)·K^(−1). All these results indicate that high-entropy (Mg,Co,Ni,Zn)Ti_(2)O_(5) with a small grain size is a potential material for thermal protection.

关键词： grain size sluggish diffusion effect two-step solid phase process high-entropy intermediate phase high-entropy pseudobrookite ceramic

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Atomically dispersed indium and cerium sites for selectively electroreduction of CO_(2)to formate

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Nano research 2023年第7期16卷 8757-8764页

作者： Zhong Liang Lianpeng Song Mingzi Sun Bolong Huang Yaping Du Tianjin Key Lab for rare earth materials and Applications Center for Rare Earth and Inorganic Functional MaterialsHaihe Laboratory of Sustainable Chemical TransformationsSmart Sensing Interdisciplinary Science CenterSchool of Materials Science and EngineeringNational Institute for Advanced MaterialsNankai UniversityTianjin 300350China Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHong Kong 999077China

Currently,single-atom combo catalysts(SACCs)for carbon dioxide reduction reaction(CO_(2)RR)to the formation of HCOOH are still very limited,especially the lanthanide-based *** this work,the novel SACCs with atomically dispersed In and Ce active sites were successfully prepared on the nitrogen-doped carbon matrix(InCe/CN).Both aberration-corrected high-angle annular dark-field scanning transmission electron microscopy(AC-HAADF-STEM)images and the extended X-ray absorption fine structure(EXAFS)spectra proved the well-isolated In and Ce *** as-prepared InCe/CN shows a high Faradaic efficiency(FE)(77%)and current density of HCOOH formation(j_(HCOOH))at-1.35 V *** hydrogen electrode(RHE),much higher than the single atom *** calculations have indicated that the introduced Ce single atom sites not only significantly promote electron transfer but also optimize the In-5p orbitals towards higher selectivity towards the HCOOH *** work innovatively extends the design of SACCs towards the main group and Ln metals for more applications.

关键词： single-atom combo catalysts carbon dioxide reduction formate generation multi-active sites rare earth

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In-situ Growth of Carbon Nanosheets Intercalated with TiO_(2) for Improving Electrochemical Performance and Stability of Lithium-ion Batteries

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Chinese Journal of Structural Chemistry 2021年第11期40卷 1513-1524,1409页

作者： HU Yan-Jie YIN Yan-Hong ZHANG Ming WU Zi-Ping SHEN Zhong-Rong Faculty of materials metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China CAS Key Laboratory of Design and Assembly of functional Nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China The Laboratory of rare-earth functional materials and Green Energy Xiamen Institute of Rare Earth MaterialsHaixi InstituteChinese Academy of SciencesXiamen 361021China

In situ growth of carbon nanomaterials on active substance is a very favorable strategy for the preparation of electrode in lithium-ion batteries with excellent electrochemical performance and high ***-sized TiO_(2) nanoparticles intercalated into carbon nanosheets(CNS@TiO_(2)SNP-600)were successfully synthesized via in-situ polymerization-carbonization method,utilizing layered H_(2)Ti_(4)O_(9)(HTO)as template and benzidine as carbon *** morphology and size of TiO_(2) are greatly influenced by carbonization *** coin cell with the CNS@TiO_(2)SNP-600 electrode demonstrates a discharge specific capacity of 430.4 mAh·g^(-1) at a current density of 0.1 A·g^(-1),and the capacity retention rate is 88.1%after 100 cycles;and it also displays a high discharge specific capacity of 101.8 mAh·g^(-1) at a high current density of 12.8 A·g^(-1).The excellent electrochemical performances can be ascribed to the capacitance effect originated from the intercalated structure of in-situ grown CNS and TiO_(2) *** believe this type of materials can be widely used in the lithium-ion batteries and other related green chemical fields.

关键词： carbon nanosheets TiO_(2) in situ growth template storage lithium

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