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检索条件"任意字段=第八届国际稀土开发与应用研讨会暨第三届中国稀土峰会"

共 151 条记录，以下是101-110 订阅

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Enhancement of near infrared emission via adjusting p H values in a novel K2LuF5: Yb3+/Tm3+ microcrystals

Enhancement of near infrared emission via adjusting p H valu...

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第八届国际稀土开发与应用研讨会暨第三届中国稀土峰会

作者： Yushuang Qi Wenjuan Bian Xue Yu Xuhui Xu Jianbei Qiu College of Materials Science and Engineering Kunming University of Science and Technology Key Laboratory of Advanced Materials of Yunnan Province

Upconversion（UC） photoluminescent microcrystals of Ln-doped K LuF have been synthesized via a facile and environmentally-friendly hydrothermal route.X-ray diffraction（XRD）, scanning electron microscopy（SEM） and photoluminescence（PL） spectroscopy were employed to characterize the samples. It is found that the as-obtained samples belong to orthorhombic system and exhibit tubular morphology with length of about 10 μm. The upconversion（UC）luminescence properties of K LuF:Yb, Tm were systematically investigated. The result indicate that the visible and near-infrared（NIR） UC photoluminescence emission intensities can be tuned in a controlled manner by alter the p H values of the initial solution. This study provides a great opportunity for exploring other complex fluorides with improved UC luminescence properties.

关键词： microcrystals near-infrared p H values

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Novel Algorithm for Solving Minimum Extraction Amount in Multi-component Extraction System

Novel Algorithm for Solving Minimum Extraction Amount in Mul...

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第八届国际稀土开发与应用研讨会暨第三届中国稀土峰会

作者：吴声程福祥廖春生严纯华 State Key Laboratory of Rare Earth Materials Chemistry and Applications

Minimum Extraction Amount(S) is an important parameter the wide-using rare earth extraction separation process. Dealing with theoretically infinite stage number,numerical solution of S for multiple component system is hard to achieve using traditional stage-by-stage static design method. In this paper, by analyzing the balance state approximating Smin, we found that there is a platform by each side of the feeding stage, which enables us to simplify the problem from calculating through infinite stages to less than 100 stages around the feeding stage. Novel algorithm for solving S in multiple component separation system like A...k/A...A_n,is schematically explained,computed results of typical high-Yttrium mineral is given. Results shows that the algorithm is suitable for solving the Smin of multiple component with sufficient accuracy and computation time.

关键词： rare earths extraction amount static design

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Multi-color green-blue emission in(Ca0.8,Ba1.2)1-x MgxSiO4:Eu2+ phosphors

Multi-color green-blue emission in(Ca0.8,Ba1.2)1-x MgxSiO4:E...

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第八届国际稀土开发与应用研讨会暨第三届中国稀土峰会

作者： Lihua He Xiao Zou Tao Wang Dunmin Lin College of Chemistry and Materials Science Sichuan Normal University

In this work, a series of(Ca, Ba) MgxSiO: 0.04Eu samples have been synthesized via a high-temperature solid method. The materials with x=0-0.05 possess the pure hexagonal phase, and an impurity phase of Ba CaMg（Si O） occurs with x increasing to 0.07. It is found that the morphology of the samples varies from torispherical to even block-shaped with the concentration of Mg increasing. The emission intensity are greatly enhanced and the sample with x=0.07 exhibits the optimum emission intensity at 456 nm. Moreover, the emission color can be tuned from green to blue area（470-456 nm） with x increasing. The underlying mechanism was proposed for the above results. The fluorescence decay and CIE of the samples were investigated. The present multi-color phosphors may have potential applications in solid state lighting and displays.

关键词： muti-color phosphors morphology fluorescence properties

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First-principle calculations and re-analysis of the optical spectra and electron paramagnetic resonance parameters for Yb3+ in YAl3（BO3）4 crystal

First-principle calculations and re-analysis of the optical ...

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第八届国际稀土开发与应用研讨会暨第三届中国稀土峰会

作者：李邦兴 Chi-fai LEUNG Yau-yuen YEUNG Department of Science and Environmental Studies The Hong Kong Institute of Education

In this paper, the energy levels of Yb ions in yttrium aluminum borate（YAB）crystal are calculated from a first principle approach and a traditional fitting *** calculated results are compared with those obtained from a re-calculation using the values of parameters given by some previous researchers. Three types of likely mistakes in the previous researcher's paper are clearly identified in this paper. The Electron Paramagnetic Resonance（EPR） parameters, which include g factors like g//and g⊥and hyperfine structure constants A// and A⊥, are also calculated through the perturbation method and compared with some observed values available in the literature.

关键词： First-principle calculations EPR Parameters Energy levels Yb3+ions YAB crystal

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Research on Removal of Harmful Ions in Wastewater of Phosphate Ore Flotation

Research on Removal of Harmful Ions in Wastewater of Phospha...

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第八届国际稀土开发与应用研讨会暨第三届中国稀土峰会

作者： Xiaodi HUANG Zhihong LIU Mining College Guizhou University Guizhou Key Lab of Comprehensive Utilization of Non-metallic Mineral Resources Guizhou University Guizhou Engineering Lab of Effective Utilization of Regional Mineral Resources Guizhou University National & Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst Areas

A large amount of wastewater generated in flotation process of phosphate ore has to be treated before returning to flotation operation. In the process of wastewater reuse, flotation index would be significantly affected when flotation residue chemicals and minerals dissolved inorganic ions are gradually accumulating up to a certain concentration, such as Ca, Mg, SO4, PO and so on. In this paper,to decrease the influence of wastewater on flotation index, coagulation precipitation method was adopted to remove harmful ions from wastewater. To determine the preferable treatment scheme, the effects of the kinds and amount of coagulation precipitation agent, reaction time and other parameters on removing inorganic ions were investigated.

关键词： Phosphate ore Wastewater of flotation Coagulation precipitation method

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Consequences of ET and MMCT on luminescence of Ce3+,Eu3+ and Tb3+ doped Li YSiO4

Consequences of ET and MMCT on luminescence of Ce3+,Eu3+ and...

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第八届国际稀土开发与应用研讨会暨第三届中国稀土峰会

作者： Rui Shi Hongbin Liang MOE Key Laboratory of Bioinorganic and Synthetic Chemistry KLGHEI of Environment and Energy Chemistry School of Chemistry and Chemical Engineering Sun Yat-sen University

A predictive understanding of the combined consequences of energy transfer（ET） and metal-metal charge transfer（MMCT） on luminescence of Ce-Tb-Eu doped Li YSi O is presented. Rietveld refinement was performed to determine the structure of host compound. The cross-relaxation（CR） of Tb is quantitatively analyzed with the Inokuti-Hirayama model of energy transfer（ET）. ET and metal-metal charge transfer（MMCT） are systematically investigated in Ce-Tb,Tb-Eu and Ce-Eu doubly doped systems. The investigations demonstrate the energy transfer（ET） and metal-metal charge transfer（MMCT） play a key role together in controlling the emission color, luminescence and its decay dynamics of Ce-Tb-Eu in Li YSi O.

关键词： Consequences of ET and MMCT on luminescence of Ce and Tb doped Li YSiO4

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Synthesis and Biological Activities Research of 3,5-Diiodo-salicylalidehyde and 4, 4'-Diaminodiphenyl Methane Schiff base and its metal Complexes

Synthesis and Biological Activities Research of 3,5-Diiodo-s...

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第八届国际稀土开发与应用研讨会暨第三届中国稀土峰会

作者： Tong ZHOU Pan SONG Tianlin YANG College of Chemistry and Chemical Engineering Ningxia University

The Schiff Base consisted of 3, 5-diiodo-salicylalidehyde and 4,4'-Diaminodiphenyl Methane and its Cu（Ⅱ） and Mn（Ⅱ） complexes have been synthesized and characterized by elemental analysis, TG-DSC, IR spectra and molar conductance analysis. The main bond parameters of the Schiff was calculated by full-optimized molecular geometries with Gaussian03 *** composition of the complexes was proved to be ML(M=Cu（Ⅱ） and Mn（Ⅱ）).The coordination reaction of the Schiff based with Cu（Ⅱ） and Mn（Ⅱ） was investigated via UV-Vis spectroscopy,the stability constants of the two complexes were determined *** binding mode between complexes and DNA was investigated by UV,viscosities, and DNA competitive binding with EB. The results showed that both complexes can bind to DNA via an intercalative binding mode, and their binding affinity for DNA follows the order the Cu（Ⅱ） complex > the Mn（Ⅱ） complex. In addition, the complexes were assayed against M. luteus by punch method.`

关键词： Iodine-containing Schiff base Cu(Ⅱ) and Mn(Ⅱ) complexes Spectrum property DNA intercalative binding mode antibacterial activity

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Auto-thermal reforming of ethanol into hydrogen over Ni-La/CeO2 catalyst

Auto-thermal reforming of ethanol into hydrogen over Ni-La/C...

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第八届国际稀土开发与应用研讨会暨第三届中国稀土峰会

作者： Zhiwei Xue Yuesong Shen Shemin Zhu Yanwei Zeng Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites College of Materials Science and Engineering Nanjing Tech University

Auto-thermal reforming of ethanol over Ce O supported Ni-La catalysts were studied as a method for yielding H-rich gas for fuel cell. Efficient catalytic activity,high H selectivity and low coke deposition were achieved by a catalyst of NiLa/10Ce-Air at an optimal reaction temperature 550 °C. The catalysts were characterized by techniques of XRD, H-TPR, BET, and SEM. Results showed that the Increases of Ni and La were beneficial to improve catalytic activity and H selectivity,but cause severe coke deposition. The performance improvement of the NiLa/10Ce-Air catalyst was ascribed to the interaction among Ni, La and Ce O, and the suitable dispersion of Ni O on the surface of catalyst. Furthermore, partial encapsulation of Ni O and LaO enhanced the stability of catalyst by inhibiting coke formation.

关键词： auto-thermal reforming ethanol H2-rich gas Ni-La/Ce O2

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Removal of La, Ce, Y and Eu from soil by saponin biosurfactant

Removal of La, Ce, Y and Eu from soil by saponin biosurfacta...

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第八届国际稀土开发与应用研讨会暨第三届中国稀土峰会

作者： ZZ LI D ZHOU Jiangxi University of Science and Technology

The objective of this study was to investigate the removal process optimization and perform an efficiency assessment, while varying different factors,such as saponin concentration, p H of saponin solution, contact time and soil/liquid ratio, for the removal of La, Ce, Y and Eu from contaminated soil by using the eco-friendly biodegradable surfactant saponin. The result showed that removal efficiency of the rare earth increased with increasing saponin concentration and removal efficiency of La, Ce, Y and Eu approached 51.54%, 46.68%, 57.93% and93.11% when the saponin concentration was 50 g/L. p H of saponin solution effects the removal efficiency and removal efficiency decreased with an increase in p H from1.5 to 3.5 and from 7 to 11. However, the removal efficiency increased with an increase in p H from 3.5 to 7. In addition, the removal efficiency increased with increasing incubation time and decreasing the soil/liquid ratio. The speciations of rare earth in the soils were identified before and after saponin treatment and the efficiency of the removal of rare earth depended on their speciation in soils.

关键词： saponin rare earth removal

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Luminescence properties of rare-earth ions(RE3+= Sm3+ and Eu3+) in Y7O6F9 microrods fabricated by hydrothermal method

Luminescence properties of rare-earth ions(RE3+= Sm3+ and Eu...

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第八届国际稀土开发与应用研讨会暨第三届中国稀土峰会

作者： Guang-Xin Xiang Zhi-Jun Zhang Guo-Jun Wang Jing-Tai Zhao School of Materials Science and Engineering Shanghai University

RE3+ activated Y7O6F9(RE3+ = Sm3+ and Eu3+) were synthesized through a facile two-step hydrothermal method followed by heat treatment. The phase formation, morphologies, components, thermal losses, as well as photoluminescence properties of as-prepared samples were investigated and discussed by means of XRD,SEM, FT-IR, TG-DSC and luminescence spectroscopy. We prepared the microrods of un-doped Y7O6F9 and explored the conversion process from the precursor to *** ultraviolet excitation, Y7O6F9:RE3+ showed the characteristic f–f emissions and give different colors of light emission, which means that the host materiel hold great promise for applications in field-emission displays.

关键词： nano-rod Y7O6F9 rare-earth

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