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Preparation of ultra-high pure scandium oxide with crude product from titanium white waste acid

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Journal of Rare Earths 2023年第5期41卷 764-770,I0005页

作者： xiujing peng Ling Li Miaomiao Zhang Yu Cui Xuchuan Jiang Guoxin Sun Institute for Smart Materials&Engineering University of JinanJinan 250022China School of Chemistry and Chemical Engineering University of JinanJinan 250022China

Recovery of scandium from titanium white waste acid is an essential source of *** and economical production of high purity scandium remains a challenge.A new extractant,N,N,N’,N’-tetracyclohexyl-diglycolamide(TCHDGA),was synthesized,and the separation performance of scandium from impurity metal ions(Ti,Mn,Ba,Fe,Al and Mg)was investigated,The effects of mixing time,acid concentration and temperature on the scandium extraction were *** extraction mechanism was studied by infrared spectroscopy and the Equimole Series *** optimized conditions,the extractant shows a strong affinity to scandium in the nitric acid medium and high extraction separation factors between scandium and these impurity metal ions,A process for the purification of scandium was *** crude product obtained from titanium white waste acid,95%purity scandium oxide,can be purified to 99.99%after only one step of extraction,scrubbing,and stripping:This technology is economical and straightforward and can realize the high-value recovery of scandium in the titanium white waste acid.

关键词： TCHDGA Recovery Scandium Ultra-high pure Titanium white waste acid Rare earths

Theoretical elucidation of rare earth extraction and separation by diglycolamides from crystal structures and DFT simulations

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Journal of Rare Earths 2021年第7期39卷 858-865,I0004页

作者： xiujing peng Jianhui Su Hao Li Yu Cui Jin Yong Lee Guoxin Sun Institute for Smart Materials&Engineering School of Chemistry and Chemical EngineeringUniversity of JinanJinan 250022China Department of Chemistry Sungkyunkwan UniversitySuwon 16419Republic of Korea

Diglycolamides(DGAs) show excellent application prospects for the extraction and separation of rare earth metals from highly radioactive liquid wastes and rare earth *** extraction ability of DGAs for rare earth ions in nitrate or chloride media increases with increasing atomic number of the rare earth *** understand the origin of this phenomenon,three binuclear crystals [Ln(TEDGA)_(3)][Ln(NO_(3))_(6)] of N,N,N’,N’-tetraethyldiglycolamide(TEDGA) with rare earth ions La(Ⅲ),Pr(Ⅲ) and Eu(III) were prepared and characterized *** three complexes belong to the triclinic crystal system,P-1 space *** bond lengths of Ln-O_(amide) are significantly shorter than those of Ln-O_(ether) in the same *** Ln-O_(amide) and Ln-O_(enher) bond lengths gradually decrease with increasing atomic number of the rare earth *** dihedral angle formed by TEDGA and metal ions through the tridentate coordination gradually increases with increasing metal ion atomic number,tending toward the formation of sizeable planar coordination structures for the most massive rare earth *** structures of the compounds formed by the extractant and metal ion were optimized by means of DFT *** find that the interaction between TEDGA and the rare earth ion is dominated by electrostatic interaction by analyzing binding energy,WBIs,Mulliken charge,natural electron configurations,and molecular orbital *** covalent component of the Ln-O bonds of the complexes increases with increasing metal atomic *** observed increase in extraction and separation capacity of diglycolamides for rare earth ions with increasing atomic number might be due to the formation of two fivemember rings by one tridentate *** rare earth ions with large atomic numbers tend to form planar structures with large dihedral angles with DGA ligands.

关键词： Diglycolamide Extraction Separation Rare earth Crystal structures DFT simulations

Strategies for improving extraction capacity through preorganization structure:A novel 5,6-bicyclicmalonamide extractant(THPPD)

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Journal of Rare Earths 2024年第4期42卷 768-774页

作者： Miaomiao Zhang Zhen Yang Yuhua Cui Jianhui Su Heng Zhao Chengjin Xu Xiaolei Liu Guoxin Sun xiujing peng Yu Cui School of Chemistry and Chemical Engineering University of JinanJinan250022China Institute for Smart Materials&Engineering University of JinanJinan250022China Shandong Institute for Food and Drug Control Jinan250101China

Rational design of extractant structure to improve the extraction and separation capacity of rare earth elements(REEs)is a long-standing ***,a new strategy was proposed to improve the stability of the chelating structure formed by malonamide and *** stability of the chelating structure is greatly improved by using a double-ring framework structure which makes the two carbonyl groups of malonamide unable to rotate freely and both of them point to the metal ion *** benzyl groups were used to construct the hydrophobicity of the extractant and the organic shell of the extracted ***-pyrrolo-pyridine-dione(THPPD)was designed and *** structure reduces the energy consumed by rotating carbonyl group in the coordination with metal ions and then improves the extraction ability of *** crystal structure was preorganized as expected,with the two carbonyls pointing in a favorable coordination direction to the structural complement of the metal *** extraction behaviors of REEs with THPPD in a nitric acid medium were *** with N,N’-dibenzyl-N,N’-dimethylmalonamide(DBDM-MA)with a chain structure,the extraction capacity of THPPD is 360 times higher than that of DBDM-MA at 5.0 mol/L sodium ***,the binding energy and Gibbs free energy were investigated by density functional theory(DFT)in conjunction with the *** theoretical results show that THPPD has more effective interaction with Pr(NO_(3))3 than *** construction of chelating groups conformation is a worthy direction to improve the coordination ability and even selectivity of extractant.

关键词： Rare earth elements Extraction separation 5,6-bicyclicdiamide extractant

Subdaily to Seasonal Change of Surface Energy and Water Flux of the Haihe River Basin in China: Noah and Noah-MP Assessment

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Advances in Atmospheric Sciences 2019年第1期36卷 79-92页

作者： Fuqiang YANG Li DAN Jing peng xiujing YANG Yueyue LI Dongdong GAO Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences School of Atmospheric Sciences Chengdu University of Information Technology

The land surface processes of the Noah-MP and Noah models are evaluated over four typical landscapes in the Haihe River Basin(HRB) using in-situ observations. The simulated soil temperature and moisture in the two land surface models(LSMs) is consistent with the observation, especially in the rainy season. The models reproduce the mean values and seasonality of the energy fluxes of the croplands, despite the obvious underestimated total evaporation. Noah shows the lower deep soil temperature. The net radiation is well simulated for the diurnal time scale. The daytime latent heat fluxes are always underestimated, while the sensible heat fluxes are overestimated to some degree. Compared with Noah, Noah-MP has improved daily average soil heat flux with diurnal variations. Generally, Noah-MP performs fairly well for different landscapes of the HRB. The simulated cold bias in soil temperature is possibly linked with the parameterized partition of the energy into surface fluxes. Thus, further improvement of these LSMs remains a major challenge.

关键词： land surface model Haihe River Basin soil temperature soil moisture surface energy flux seasonal cycle

Spatiotemporal variations of carbon flux and nitrogen deposition flux linked with climate change at the centennial scale in China

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Science China Earth Sciences 2020年第5期63卷 731-748页

作者： Dongdong GAO Li DAN Guangzhou FAN Hanqin TIAN Jing peng xiujing YANG Fuqiang YANG Yueyue LI Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Atmospheric Science Chengdu University of Information EngineeringChengdu 610225China International Center for Climate and Global Change Research Auburn UniversityAL 36849USA Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

The spatial and temporal variations of the vegetation carbon flux in China from 1901 to 2005 were studied using the vegetation net primary production(NPP)values from seven Earth-system *** addition,the temporal and spatial changes in the nitrogen deposition flux in China were studied using the NHx and NOy fluxes from 1901 to *** relationship between changes in the carbon flux,nitrogen flux and climate was *** results show that(1)over the past 100 years,NPP in China has shown an upward *** average trend coefficient is 0.88 and the NPP distribution trend is generally low in the north and high in the south,with a gradual increase from the northwest to the ***,precipitation and radiation are all conducive to plant growth in the direction of the *** correlation coefficients between the ensemble model mean NPP and temperature,precipitation,longwave radiation and shortwave radiation are 0.88,0.73,0.91 and 0.67,respectively.(2)In the past 100 years,the NHx and NOy fluxes in China have shown an upward trend,with trend coefficients of 0.98 and 0.98,respectively,which pass the 99.9%confidence level of the *** and NOy fluxes are also generally low in the north and high in the south,with a gradual increase from the northwest to the southeast in a step-like pattern.(3)The spatial distribution of the correlation coefficients between the NHx and NOy fluxes and air temperature is similar,with only slight differences in *** spatial distribution of the correlation coefficients between the NHx and NOy fluxes and precipitation is similar in overall pattern,but the pattern is relatively complicated,with a positive-negative-positive-negative-positive pattern occurring across the monsoon region from north to south,and a negative-positive-negative-positive pattern occurring beyond the monsoon region from east to west.(4)The spatial distribution of the correlation coefficients between the NHx and NOy fluxes and NPP shows a ge

关键词： Net primary production(NPP) Temperature Precipitation NHx NOy

ZrO_2负载CuO催化剂的超声-沉淀制备及其催化氧化CO的性能

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徐州工程学院学报（自然科学版） 2016年第3期31卷 49-54页

作者：崔玉花田其燕彭修静于文江牟晓磊孙国新山东省食品药品检验研究院山东济南250013 济南大学化学化工学院山东济南250022

以氧氯化锆、尿素为原料,采用溶胶-凝胶法并结合超临界CO2干燥制备了纳米二氧化锆,利用XRD、TG-DTA、BET等手段对样品进行了表征.以制备的纳米二氧化锆作为载体、强搅拌和超声下沉积法制备负载铜催化剂,考察了比表面积、煅烧温度、氧化... 详细信息

以氧氯化锆、尿素为原料,采用溶胶-凝胶法并结合超临界CO2干燥制备了纳米二氧化锆,利用XRD、TG-DTA、BET等手段对样品进行了表征.以制备的纳米二氧化锆作为载体、强搅拌和超声下沉积法制备负载铜催化剂,考察了比表面积、煅烧温度、氧化铜负载量等因素对CO催化氧化性能的影响.实验表明:负载12%氧化铜催化剂经400℃煅烧后具有最佳的催化活性,催化反应的起始温度为84℃,温度达到162℃时催化活性已经超过95%,显示了较好的低温催化活性.

关键词： CuO ZrO2 催化氧化负载型催化剂沉淀法

Response of Growing Season Gross Primary Production to El Nino in Different Phases of the Pacific Decadal Oscillation over Eastern China Based on Bayesian Model Averaging

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Advances in Atmospheric Sciences 2021年第9期38卷 1580-1595页

作者： Yueyue LI Li DAN Jing peng Junbang WANG Fuqiang YANG Dongdong GAO xiujing YANG Qiang YU Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of ScienceBeijing 100049China Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China National Ecosystem Science Data Center Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityShaanxi 712100China School of Life Sciences University of Technology SydneySydney 2007NSWAustralia

Gross primary production(GPP) plays a crucial part in the carbon cycle of terrestrial ecosystems.A set of validated monthly GPP data from 1957 to 2010 in 0.5°× 0.5° grids of China was weighted from the Multi-scale Terrestrial Model Intercomparison Project using Bayesian model averaging(BMA).The spatial anomalies of detrended BMA GPP during the growing seasons of typical El Nino years indicated that GPP response to El Nino varies with Pacific Decadal Oscillation(PDO) phases: when the PDO was in the cool phase,it was likely that GPP was greater in northern China(32°–38°N,111°–122°E) and less in the Yangtze River valley(28°–32°N,111°–122°E);in contrast,when PDO was in the warm phase,the GPP anomalies were usually reversed in these two *** consistent spatiotemporal pattern and high partial correlation revealed that rainfall dominated this *** previously published findings on how El Nino during different phases of PDO affecting rainfall in eastern China make the statistical relationship between GPP and El Nino in this study theoretically *** paper not only introduces an effective way to use BMA in grids that have mixed plant function types,but also makes it possible to evaluate the carbon cycle in eastern China based on the prediction of El Nino and PDO.

关键词： East China Bayesian model averaging Gross primary production El Nino Pacific Decadal Oscillation Monsoon rainfall

Integration of nitrogen dynamics into the land surface model *** 2:baseline data and variation of carbon and nitrogen fluxes in China

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Atmospheric and Oceanic Science Letters 2020年第6期13卷 518-526页

作者： DAN Li YANG xiujing YANG Fuqiang peng Jing LI Yueyue GAO Dongdong JI Jinjun HUANG Mei Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijingChina Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographical Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina

The spatiotemporal features of carbon and nitrogen fluxes over China between 1979 and 2015were simulated by the Atmosphere–Vegetation Interaction Model(AVIM).The carbon fluxes of gross primary production and net primary production captured the distribution pattern in China better than MODIS and TRENDY *** results for nitrogen deposition and biological nitrogen fixation show the good performance of the AVIM simulation compared with the CMIP6 and CABLE data,with a deposition rate>4 g N m-2yr-1in south *** variation in the gross primary production and net primary production can be up to 300 and 200 g C m-2yr-1in south and southeast China,respectively,and there is a discrepancy between the AVIM and the data from MODIS and *** shows the difficulty in simulating the carbon flux in a monsoon climate region and the importance of coupling the nitrogen–carbon *** standard deviation of nitrogen deposition and biological nitrogen fixation is simulated well by the AVIM and there is a large range in nitrogen deposition of 0.8–1.2 g N m-2yr-1in south *** climatological mean of the fluxes performs better than the variation in the standard deviation and anomaly and this variation in the carbon–nitrogen flux is the key to decreasing bias in future modeling studies.

关键词： AVIM nitrogen dynamics regional scale carbon and nitrogen flux

The integration of nitrogen dynamics into a land surface model. Part 1: model description and site-scale validation

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Atmospheric and Oceanic Science Letters 2019年第1期12卷 50-57页

作者： YANG xiujing DAN Li YANG Fuqiang peng Jing LI Yueyue GAO Dongdong JI Jinjun HUANG Mei Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Sciences College of Earth and Planetary Sciences University of Chinese Academy of Sciences Key Laboratory of Water Cycle and Related Land Surface Processes Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences School of Atmospheric Sciences Chengdu University of Information and Technology Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences

Nitrogen cycling has profound effects on carbon uptake in the terrestrial ecosystem and the response of the biosphere to climate ***,nutrient cycling is not taken into account in most land surface models for climate *** this study,a nitrogen model,based on nitrogen transformation processes and nitrogen fluxes exchange between the atmosphere and terrestrial ecosystem,was incorporated into the Atmosphere–Vegetation Interaction Model(AVIM)to simulate the carbon cycle under nitrogen *** new model,AVIM-CN,was evaluated against site-scale eddy covariance–based measurements of an alpine meadow located at Damxung station from the FLUXNET 2015 *** showed that the annual mean gross primary production simulated by AVIM-CN(0.7073 gC m^-2 d^-1)was in better agreement with the corresponding flux data(0.5407 gC m^-2 d^-1)than the original AVIM(1.1403 gC m^-2 d^-1)at Damxung ***,ecosystem respiration was also down-regulated,from 1.7695 gC m^-2 d^-1 to 1.0572 gC m^-2 d^-1,after the nitrogen processes were introduced,and the latter was closer to the observed vales(0.8034 gC m^-2 d^-1).Overall,the new results were more consistent with the daily time series of carbon and energy fluxes of observations compared to the former version without nitrogen dynamics.A model that does not incorporate the limitation effects of nitrogen nutrient availability will probably overestimate carbon fluxes by about 40%.

关键词： Coupled carbon and nitrogen dynamics nitrogen limitation land surface model carbon–nitrogen–water cycles