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Assembly of a core–shell MOF with stability into polyacrylamide hydrogel for boosting extraction of uranium from seawater

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Nano Research 2024年第4期17卷 3398-3406页

作者： Yucheng Song Huanhuan Tan Shiliang Qin Zhong Liu Chuntai Liu Changyu Shen Peipei Yang Songwei Li National Engineering Research Center for Advanced Polymer Processing Technology Key Laboratory of Materials Processing and Mold(Ministry of Education)Zhengzhou UniversityZhengzhou 450002China key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt LakesQinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China

efficient and selective extraction of uranium(U(VI))from seawater is essential for sustainable nuclear power *** study reports a novel adsorbent zeolitic imidazolate framework(ZIF)-67@SiO_(2)-A/polyacrylamide(PAM)which was synthesized by grafting the core–shell metal–organic frameworks(MOFs)-based nanostructures coated with the 3-aminopropyl triethoxysilane(APTES)functionalized SiO_(2)(SiO_(2)-A)onto PAM *** SiO_(2) shell was grown on the surface of MOF,which improved the acid-base resistance of *** introduction of ZIF-67@SiO_(2)-A enhances the specific surface area and adsorption efficiency of the *** ZIF-67@SiO_(2)-A/PAM shows remarkable adsorption capacity,fast adsorption kinetics,and good reusability for *** has excellent adsorption property(6.33 mg·g^(-1),30 d)in natural *** X-ray photoelectron spectroscopy(XPS),Fourier transform infrared(FTIR),energy dispersive spectroscopy(EDS)mappings,and density functional theory reveal that the coordination by N and O in ZIF-67@SiO_(2)-A/PAM with uranium is the main mechanism of uranium ***,ZIF-67@SiO_(2)-A/PAM has great potential to capture uranium from natural seawater.

关键词： hydrogel metal–organic frameworks core–shelled nanostructures uranium extraction from seawater

Distribution and origin of brine-type Li-Rb mineralization in the Qaidam Basin,NW China

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Science China Earth Sciences 2022年第3期65卷 477-489页

作者： Jiansen LI Tingwei LI Yunqi MA Fukun CHEN School of Earth and Space Sciences University of Science and Technology of ChinaHefei 230026China key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Qinghai Provincial key laboratory of Geology and Environment of salt lakes Xining 810008China

The Qaidam Basin on the Qinghai-Tibet Plateau is well endowed with a variety of critical metals,such as Li and ***,little is known about the distribution,source,and enrichment mechanisms of these *** this paper,we present results of systematic geochemical and H-O-B isotopic analyses of brines in the Tertiary and Quaternary sediments of the Qaidam *** results reveal that the paleobrines from oil-bearing anticlines at Dafengshan,Nanyishan,Youquanzi,Jiandingshan,and Jianshishan are significantly enriched in Li and Rb,whose contents are 81.1-128.9 mg L^(-1)and 4.5-29.2 mg L^(-1),respectively,reaching levels of economic *** Rb contents(up to 12.5 mg L^(-1))and well-endowment of Li also characterize the Dongtai,Xitai,Yiliping,and Senie salt lakes in the Qaidam *** Tertiary paleobrine average inδD andδ18O at-40.7‰and 2.84‰,*** paleobrine with the highest Li and Rb hasδD andδ^(18)O values close to magmatic ***δ^(11)B values are lower than those of river water but close to those of geothermal fluids,suggesting that replenishment by deep magmatic hydrothermal fluid is most likely the key mechanism for the anomalous enrichment of these elements in the paleobrines,though evaporation and water-rock reactions have contributed to the critical metal *** anomalous enrichment of Li and Rb in modern salt lake brines is closely related to the input of volcanic geothermal *** relatively high Li and Rb contents of intercrystalline brines in salt lakes of the western Qaidam Basin and the increase of Li and Rb contents with increasing depth were caused by upwelling of local paleobrines along the fault zones.

关键词： Li and Rb resources Paleobrine salt lake brine Hydrogen H-O-B isotopes Qaidam Basin

Spatio-temporal change and driving mechanisms of land use/cover in Qarhan salt lake area during from 2000 to 2020, based on machine learning

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Research in Cold and Arid Regions 2024年第5期16卷 239-249页

作者： Chao Yue ZiTao Wang JianPing Wang key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt Lakes Chinese Academy of Sciences Qinghai Provincial key laboratory of Geology and Environment of salt lakes University of Chinese Academy of Sciences

The significance of land use classification has garnered attention due to its implications for climate and ecosystems. This paper establishes a connection by introducing and applying automatic machine learning(Auto ML)techniques to salt lake landscape, with a specific focus on the Qarhan salt lake area. Utilizing Landsat-5 Thematic Mappe(TM) and Landsat-8 Operational Land Imager(OLI) imagery, six machine learning algorithms were employed to classify eight land use types from 2000 to 2020. Results show that XGBLD performed optimally with77% accuracy. Over two decades, salt fields, construction land, and water areas increased due to transformations in saline land and salt flats. The exposed lakes area exhibited a rise followed by a decline, mainly transforming into salt flats. Agricultural land areas slightly increased, influenced by both human activities and climate. Our analysis reveals a strong correlation between salt fields and precipitation, while exposed lakes demonstrate a significant negative correlation with evaporation and temperature, highlighting their vulnerability to climate change. Additionally, human water usage was identified as a significant factor impacting land use change,emphasizing the dual influence of anthropogenic activities and natural factors. This paper addresses the void in the application of Auto ML in salt lake environments and provides valuable insights into the dynamic evolution of land use types in the Qarhan salt lake region.

关键词： Automatic machine learning Qarhan salt lake Land use classicification Transformation

Chemical composition and Pb(II)binding of dissolved organic matter in a hypersaline lake in China

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Journal of Oceanology and Limnology 2022年第1期40卷 113-127页

作者： Keli YANG Yaoling ZHANG Yaping DONG Wu LI key laboratory of comprehensive and highly Effi cient utilization of salt lake resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Qinghai Technology Research and Development Center of comprehensive utilization of salt lakes resources Xining 810008China Qinghai Provincial key laboratory of resources and Chemistry of salt lakes Xining 810008China

Dissolved organic matter(DOM)plays a vital role in promoting carbon and nutrient *** is a food source for organisms and controls the migration and transformation of trace metals and other contaminants in aquatic *** contributions of aquatic DOM to the environment and ecology of a system are closely related to its abundance and chemical *** this study,the chemical composition and binding properties of DOM in a hypersaline lake watershed were investigated for the fi rst time using dissolved organic carbon(DOC)analysis,absorption spectroscopy,Fourier transform infrared spectroscopy,pyrolysis-GC-MS(Py-GC-MS),and fl uorescence parallel factor(PARAFAC)analysis combined with Pb(II)titration *** results showed that DOM from the tributaries that fl owed into the lake had a lower DOC content,higher molecular weight,and higher specifi c UV absorbance than the DOM in lake ***-like fl uorophores were mainly found in tributary and lake surface water DOM(LSDOM)and humic-like substances were abundant in lake groundwater DOM(LGDOM).Using this multi-methodological approach,we found that the DOM from the hypersaline lake watershed was mainly from microbial origins,and consisted of aromatics,carbohydrates,and *** results from quantitative analysis showed that DOM from the infl owing tributaries contained more aromatics,lower carbohydrates,and lower aliphatics than DOM in the *** aromatic hydrocarbons and carbohydrates were more abundant in LSDOM than *** results from the Pb(II)titration technique coupled with PARAFAC analysis suggested that PARAFAC-derived components had relatively low condition stability constants(log K_(M)lake DOM,the LGDOM had a higher Pb(II)binding potential than the *** this study we have improved our understanding of how DOM within a hypersaline lake watershed varies in its composition and potential to bind with metals.

关键词： dissolved organic matter hypersaline lake watershed composition parallel factor analysis Pb(II)titration

Recharge processes limit the resource elements of Qarhan salt lake in western China and analogues in the evaporite basins

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Journal of Oceanology and Limnology 2023年第4期41卷 1226-1242页

作者： Hualing SONG Qishun FAN Qingkuan LI Tianyuan CHEN Haotian YANG Chunmei HAN key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Qinghai Provincial key laboratory of Geology and Environment of salt lakes Xining 810008China University of Chinese Academy of Sciences Beijing 100049China

The Qarhan salt lake(QSL)in western China is K-Sr-Li-B-Br-Rb multi-resource coexisting Quaternary brine *** research efforts have been directed to the origin of K-Li resources and evolutionary history of the ***,the study on the different sources,recharge processes,and differential distribution patterns for these resource elements in brine deposits is still ***,we measured Li-B concentrations and H-O-Sr-B isotopic compositions of different waters(river,spring,and brine)from the QSL,combined with the reported K-Sr contents and multiple isotopes of waters,to discuss the recharge,source of K-Sr-Li-B and their spatial distributions,by analogy with other evaporite basins in the *** results show that:(1)the K-Li-B-Sr elemental concentrations of brines and their spatial distribution in the QSL are diverse;(2)high K and Sr values are distributed in Dabuxun and Qarhan sections,respectively,which are controlled by Ca-Cl springs in the northern QSL;on the contrary,Li and B values are enriched in the Bieletan section and are charged by thermal springs in the Kunlun Mountains;(3)the formation and evolution of Ca-Cl and thermal springs constrain fundamentally on the recharge processes of K-Sr and Li-B elements in the terminal salt lakes of the Qaidam Basin(QB);(4)some analogues of recharge processes limit the resource elements of the QSL and other salt lakes(Da Qaidam,Lop Nur,Zhabuye,Atacama,and Guayatayoc)in the world provides a reference for the resource exploration in deep formation waters in the evaporite basins.

关键词： K-Sr-Li-B elements differential distribution recharge process Qarhan salt lake(QSL) analogue

Influencing mechanism and hydrogeological implications of water level fluctuation of lakes in the northern Qaidam Basin,Qinghai-Tibet Plateau

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Journal of Oceanology and Limnology 2023年第4期41卷 1243-1257页

作者： Yaping CHENG Qishun FAN Tianyuan CHEN Haotian YANG Qingkuan LI Chunmei HAN key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China Qinghai Provincial key laboratory of Geology and Environment of salt lakes Xining 810008China University of Chinese Academy of Sciences Beijing 100049China

The Qaidam Basin(QB)is a concentrated distribution area and chemical industrial bases of salt lakes in *** in the QB have been expanding during the past 20 *** lake expansion resulted in some considerable scientific issues on the protection of salt lake resources and infrastructure,and monitoring of hydrological processes at the lake-basin *** the spatial-temporal trends of lake changes on the Qinghai-Tibet Plateau(QTP)have been well documented,the underlying influencing mechanism and hydrogeological implications of rapid lake changes in the QB are not well *** lakes in the northern QB were selected to investigate lake water level fluctuations on different time scales based on extensive in-situ monitoring and satellite *** influencing mechanism and hydrogeological implications of rapid changes of terminal lakes were discussed in combination with the reported increasing precipitation rate and mass balance of glaciers in the northern *** reveal the following:(1)the fluctuation pattern of Sugan lake was asynchronous and out of phase with that of Xiao Qaidam and Toson lakes during the monitoring period;(2)Sugan lake water rose gradually,and the rise interval was from late April to early *** contrast,Xiao Qaidam and Toson lakes took on a rapid and steep rise,and the rise intervalwas from late July to September;(3)the influencing mechanisms for rapid lake fluctuations are controlled by different factors:glacier and snow melting with increasing temperature for Sugan lake and increasing precipitation for Xiao Qaidam and Toson lakes;(4)in accordance with different intervals and influencing mechanisms of rapid lake expansions in the QB,hydrological risk precaution of lakes and corresponding river catchments was conducted in different parts of the *** study provided an important scientific basis for assessing the hydrological process and hydrological risk precaution,and protection of salt lake resources al

关键词： lake level fluctuation influencing mechanism hydrogeological implication northern Qaidam Basin in-situ monitoring

Influence of the roots of mixed-planting species on the shear strength of saline loess soil

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Journal of Mountain Science 2021年第3期18卷 806-818页

作者： LIU Ya-bin HU Xia-song YU Dong-mei ZHU Hai-li LI Guo-rong Department of Geological Engineering Qinghai UniversityXining 810016China Qinghai Institute of salt lakes Chinese Academy of ScienceXining 810008China key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Provincial Key Laboratory of Geology and Environment of Salt LakesXining 810008China

In order to improve our knowledge of the mechanical effect of the roots of mixed-plantings on soil reinforcement and slope protection,the influence of roots of a mixed-planting with four herb species(Medicago sativa L.,Elymus nutans Griseb.,Puccinellia distanx(L.),and Poa pratensis L.)and one shrub species(Caragana korshinskii Kom.)were investigated on the shear strength characteristics of saline loess *** root distribution characteristics were assessed via a survey when the plants grew for one *** effects of the root biomass density,the root mass ratio(RMR)of the fine roots to the coarse roots,the moisture content,and the salt content on the shear strength index of the rooted soil were analyzed via a triaxial compression test,and the mechanism of these effects was *** results indicate that the biomass density decreased linearly with increasing *** RMR initially decreased with depth and then increased,exhibiting in a quadratic *** cohesion of the rooted soil increased linearly as the biomass density *** cohesion of the rooted soil initially increased with increasing RMR and salt content,and then it *** turning point of the cohesion occurred when the RMR was 0.6 and the salt content was 1.18%.The internal friction angle of the rooted soil initially increased with biomass density and then decreased,and the turning point of the internal friction angle occurred when the biomass density was 0.015 g/*** relationships between the internal friction angle of the rooted soil and the RMR and salt content were exponential incremental and linear subtractive relationship,*** the cohesion and the internal friction angle of the rooted soil linearly decreased with increasing moisture content.

关键词： Xining Basin Herb species Shrub species Rooted soil Saline loess soil Soil reinforcement Shear strength index

Biomass Carbon Aerogel Modified by N235 and KH560 for Removal of Iodide from Oilfield Brine

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Journal of Wuhan University of Technology(Materials Science) 2022年第4期37卷 608-619页

作者： HU Yaoqiang GUO Min YE Xiushen LIU Haining WU Zhijian key laboratory of Climate Resources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong ProvinceGuangdong Ocean UniversityZhanjiang 524088China key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt LakesQinghai Institute of Salt LakesChinese Academy of SciencesXining 810008China

Owing to porous structure,stable chemical properties,low cost and available raw material,biomass carbon aerogel is a promising adsorbent framework ***,a pomelo peel-based carbon aerogel was prepared by hydrothermal-freeze drying-high temperature carbonization method and modified with Tri-n-ocylamine(N235)and γ-Glycidyloxypropyltrimethoxysilane(KH560)via impregnation *** as-prepared adsorbents exhibit superior adsorption performance for iodide in simulated and oilfield brines,and the highest adsorption amount of iodide in oilfield brine can reach 0.58 mmol/*** is also demonstrated by adsorption kinetics and isotherms that iodide is adsorbed through chemical *** of tertiary amide group in N235 and epoxy group in KH560 may be the main reason for the highly selective adsorption of iodide.

关键词： biomass carbon aerogel oilfield brine iodide adsorption

Aquatic Species Dominate Organic Matter in Qinghai lake during the Holocene:Evidence from Eolian Deposits around the lake

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Journal of Earth Science 2017年第3期28卷 484-491页

作者： Fangming Zeng Xiangjun Liu Xiangzhong Li Chongyi E key laboratory of comprehensive and highly efficient utilization of salt lake resources Qinghai Institute of Salt LakesChinese Academy of Sciences State key laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences key laboratory of Physical Geography and Environmental Processes of Qinghai Province Qinghai Normal University

Total organic carbon（TOC） in lake sediments and its stable carbon isotope（δ（13）C（org）） are widely applied to investigate paleoenvironmental changes even though their implications are complicated and multi-explanatory. Organic geochemistry studies of lake sediments from Qinghai lake have been investigated, but some interpretations are controversial. In this study, TOC of one Holocene eolian section and δ（13）C（org） of three eolian sections were studied around Qinghai lake. Results indicate that the TOC content in eolian deposits was low during the Early Holocene, and gradually increased to high values during the Middle and Late Holocene. The variation in TOC content of eolian deposits is different from that in the lacustrine sequence from Qinghai lake during the Holocene. The δ（13）C（org） values in the eolian sections were relatively stable, with oscillation amplitudes of 4‰（ranging from-25.8‰ to-22.1‰）, in contrast to 10‰ variation s in δ（13）C（org） values（varying from-30‰ to-20‰） in lacustrine sediments. Through comparison of TOC and δ（13）C（org） values between eolian deposits and lacustrine sediments, we can confirm indications that the organic matter in Qinghai lake sediments during the Holocene was primarily a contribution of the aquatic species in the lake. This is significant for understanding the origin of organic matter in lake sediments on the northeastern Qinghai-Tibetan Plateau and for paleoenvironmental inferences using such proxies.

关键词： Qinghai lake total organic carbon(TOC) organic carbon isotope(δ(13)C(org)) Qinghai-Tibetan Plateau