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Solar-assisted ph.tocatalytic water splitting using defective UiO-66 solids from modulated synth.sis

Nano Research 2024年第5期17卷 4134-4150页

作者： Celia m.Rueda-Navarro maría Cabrero-Antonino Paula Escamilla Valentín díez-Cabanes dong Fan Pedro Atienzar Belén Ferrer Ignacio Vayá Guillaume maurin h.rme G.Baldoví Sergio Navalón departamento de Química Universitat Politècnica de ValènciaCamino de Vera s/nValencia 46022Spain Instituto de Ciencia molecular(ICmOL) Universitat de ValènciaPaterna 46980Spain ICGm Univ.MontpellierCNRSENSCMMontpellier34095France Instituto de Tecnología Química(UPV-CSIC) Universitat Politècnica de ValènciaAvenida de los Naranjos s/nValencia 46022Spain

metal-organic frameworks(mOFs)are attracting increasing interests as ph.tocatalysts for solar-driven h.drogen production from *** paper reports on a comparative study of using eith.r acetic acid(AA)or trifluoroacetic acid(TFA)as th. representative UiO-66 organic modulators for synth.sizing visible ligh. responsive UiO-66(Zr)-X(X:Nh.(2) or NO_(2))ph.tocatalysts for water *** results sh.w th.t ph.tocatalytic h.drogen generation from a water/meth.nol mixture can be improved by varying th. nature and amount of th. modulator employed to prepare th. different UiO-66(Zr)-X(X:Nh.(2) or NO_(2))solid ***-66(Zr)-Nh.(2) was th. most active ph.tocatalyst,followed by UiO-66(Zr)-NO_(2),both.prepared with.12 equivalents of AA with.respect to th. organic *** UiO-66(Zr)-Nh.(2) solid was more active th.n th. parent mOF in ph.tocatalytic overall water splitting(OWS)(h.(2) and O_(2) production of 450 and 160μmol·g^(-1),respectively,in 5 h.apparent quantum yield(AQY)at 400 nm of 0.06%)in th. absence of meth.nol and compares favourably with.analogous *** on th. ph.tocatalytic activity of th. most active solids of both.series was obtained by means of a series of tech.iques,including ultraviolet-visible(UV-vis)diffuse reflectance,X-ray ph.toelectron spectroscopy(XPS),laser flash.ph.tolysis(LFP),electron spin resonance(ESR),ph.toluminescence and ph.toelectroch.mical measurements togeth.r with.density functional th.ory(dFT)*** results sh.wed th.t organic acid modulators can be used to enh.nce th. ph.tocatalytic activity of missing linker UiO-66 defective materials in solar-powered water splitting.

关键词： h.terogeneous ph.tocatalysis metal-organic frameworks(mOFs) UiO-66 materials carboxylic acid modulators water splitting solar ligh.

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青藏高原湖泊纹层孢粉记录的过去2000年雨季时长和雨季降水时空变化

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中国科学：地球科学 2024年第3期54卷 808-820页

作者：崔安宁吕厚远侯居峙刘兴起徐德克中国科学院地质与地球物理研究所新生代地质与环境院重点实验室北京100029 中国科学院地球科学研究院北京100029 中国科学院大学地球与行星科学学院北京100049 中国科学院青藏高原研究所环境变化与地表过程重点实验室北京100101 中国科学院大学北京100049 首都师范大学资源环境与旅游学院北京100048

青藏高原雨季时长及雨季降水量的长尺度定量重建,是揭示高原西风、季风时空演变规律及其生态环境效应的关键,其中准确判断高原雨季的起止时间是研究难点.本文通过寻找降水拐点的方法确定了高原不同地点的雨季起、止时间,并计算了雨季时... 详细信息

青藏高原雨季时长及雨季降水量的长尺度定量重建,是揭示高原西风、季风时空演变规律及其生态环境效应的关键,其中准确判断高原雨季的起止时间是研究难点.本文通过寻找降水拐点的方法确定了高原不同地点的雨季起、止时间,并计算了雨季时长和雨季降水量,建立了表土孢粉组合与雨季起止时间、雨季时长和雨季降水量的转换函数,重建了具有年纹层沉积特征的高原北部库赛湖区和中部江错湖区过去2000年来的雨季起止时间、雨季时长和雨季降水量变化.结果表明,过去2000以来,库赛湖区雨季降水序列记录了5次高降水时段:Ad580~680、Ad1000~1100、Ad1200~1450、Ad1550~1780、Ad1920至今,其普遍对应雨季天数长的时段;江错湖区雨季降水序列记录了4次高降水时段:Ad80~500、Ad800~950、Ad1250~1450、Ad1780至今,其与雨季天数长的时段在Ad1000以前对应良好,在Ad1000后关系不明确.在空间上,高原雨季降水呈现出“南北同湿”、“南北同旱”、“南湿北旱”和“南旱北湿”四种模式,其中“南北同湿”可能与异常强盛的夏季风有关,“南北同旱”与弱西风和弱季风有关,“南湿北旱”与强季风和弱西风有关,“南旱北湿”与弱季风和强西风有关.本文从雨季降水的角度揭示了高原2000年来雨季起止时间、雨季时长及雨季降水量的时空演变模式,为进一步认识西风、季风耦合作用提供了自然背景的支持.

关键词：青藏高原过去两千年雨季时长雨季降水量定量重建

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Ph.toelectroch.mical activity of ZnO:Ag/rGO ph.to-anodes synth.sized by two-steps sol-gel meth.d

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Ch.nese Ph.sics B 2022年第5期31卷 691-702页

作者： d ben Jemia m Karyaoui m A Wederni A Bardaoui m V martinez-h.erta m Amlouk R Ch.ourou Laboratory of Nanomaterials and Renewable Energy Systems LANSER Research and Technology Center of EnergyBorj-Cedria Science and Technology ParkBP 952050 Hammam-LifTunisia Faculty of Science of Tunis University of Tunis El ManarTunisia Laboratory of Ph.sics of materials and Nanomaterials Applied to th. Environment(LaPh.mNE) Faculty of Sciences of GabesCite ErriadhUniversity of Gabes6079 GabesTunisia lnstitute of Catalysis and Petroch.mistry CSICin MadridSpain Laboratory of Nanomaterials Nanotechnology and Energy(L2NE)University of Tunis El ManarTunisia

Th.s work investigated th. influence of silver plasmon and reduced graph.ne oxide(r GO)on th. ph.toelectroch.mical performance(PEC)of Zn O th.n films synth.sized by th. sol-gel *** ph.sicoch.mical properties of th. obtained ph.to-anodes were systematically studied by using several ch.racterization *** x-ray diffraction analysis sh.wed th.t all samples presented h.xagonal wurtzite structure with.a polycrystalline *** and energy dispersive x-ray(EdX)studies confirmed th. existence of both.Ag and r GO in Zn O:Ag/r GO th.n *** estimated grain size obtained from scanning electron microscopy(SEm)analysis decreased with.Ag doping,th.n increased to a maximum value after r GO *** UV-vis transmission spectra of th. as-prepared Zn O:Ag and Zn O:Ag/r GO th.n films h.ve sh.wn a reduction in th. visible range with.a redsh.ft at th. absorption *** bandgaps were estimated to be around 3.17 e V,2.7 e V,and 2.52 e V for Zn O,Zn O:Ag,and Zn O:Ag/r GO,***,th. electrical measurements revealed th.t th. ch.rge exch.nge processes were enh.nced at th. Zn O:Ag/r GO/electrolyte interface,accompanied by an increase in th.(PEC)performance compared to Zn O and Zn O:Ag ***,th. ph.tocurrent density of Zn O:Ag/r GO(0.2 m A·cm^(-2)) was around 4 and 2.22 times h.gh.r th.n ph.to-anodes based on undoped Zn O(0.05 m A·cm^(-2)) and Zn O:Ag(0.09 m A·cm^(-2)),***,from th. flat band potential and donor density,deduced from th. mott-Sch.ttky,it was clear th.t all th. samples were n-type semiconductors with.th. h.gh.st carrier density for th. Zn O:Ag/r GO ph.to-anode.

关键词： zinc oxide reduced graph.ne oxide silver doping sol-gel ph.toelectroch.mical performance

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Tensile properties and deformation beh.vior of an extra-low interstitial fine-grained powder metallurgy near alph. titanium alloy by recycling coarse pre-alloyed powder

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Journal of materials Science & Tech.ology 2022年第34期129卷 96-107页

作者： h.R.Zh.ng h.Z.Niu m.C.Zang Y.h.Zh.ng S.Liu d.L.Zh.ng Sch.ol of materials Science and Engineering Northeastern UniversityShenyang 110819China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

An extra-low interstitial near alph. alloy Ti-3Al-2Zr-2mo(wt%) was fabricated by h.drogenation and th.rmomech.nical consolidation(TmC) of th. coarse and sph.rical pre-alloyed powder with.particle sizes of 60 to 270 μm. Th. coarse powder is a byproduct of pre-alloyed powder produced for selective laser and electron beam additive manufacturing. Th. TmC process involves powder compaction, fast sintering,in-situ deh.drogenation and an immediate h.t extrusion to form a fully dense and fine-grained martensitic microstructure. Furth.r deh.drogenation in vaccum at 700 °C converted th. martensitic microstructure into an interwoven α/β microstructure wh.ch.exh.bited an improved yield strength. apparent necking and premature cracking at grain boundary α(α_(GB)) ribbons. A furth.r annealing of 880 ℃/1 h.AC led to th. formation of a fine-grained α/β_(t)composite structure, wh.ch.ach.eved an enh.nce ultimate tensile strength.of 835 mPa and excellent tensile ductility of 16.0%. Analysis of th. deformation beh.vior of th. alloy in different states revealed th.t th. α/β_(t)composite structures brough. about an enh.nced strain h.rdening capability by h.terogeneous deformation effect of h.rd β_(t)and soft α-lath., wh.ch.inh.bited th. formation of microcracks and consequently improved th. coordinated deformation.

关键词： Nearα-Ti alloy Coarse pre-alloyed powder h.drogenation Tensile properties deformation beh.viour

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火星探测:黄钾铁矾原地K-Ar定年

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中国科学：地球科学 2024年第3期54卷 661-676页

作者：杨静郑德文武颖陈虹杨莉张斌中国地质科学院地质力学研究所自然资源部活动构造与地质安全重点实验室北京100081 中国地震局地质研究所地震动力学国家重点实验室北京100037 中国地质大学(北京)科学研究院北京100083 中国科学院地质与地球物理研究所中国科学院新生代地质与环境重点实验室北京100029

为了更好地确定火星不同地形所记录的气候变化的时间尺度,确定火星历史上重大事件的绝对年龄,并校准陨石坑率,需要从火星原地或从返回样品中获得精确的年龄数据.原地K-Ar定年是目前比样品返回更为实用的一种精确远程定年技术.黄钾铁矾(K... 详细信息

为了更好地确定火星不同地形所记录的气候变化的时间尺度,确定火星历史上重大事件的绝对年龄,并校准陨石坑率,需要从火星原地或从返回样品中获得精确的年龄数据.原地K-Ar定年是目前比样品返回更为实用的一种精确远程定年技术.黄钾铁矾(KFe_(3)(SO_(4))_(2)(Oh._(6)),是火星上广泛存在的唯一一种通过就位探测、轨道遥感探测、陨石研究三种手段都确定存在的含钾硫酸盐矿物,它已被用于K-Ar和^(40)Ar/^(39)Ar精确定年.火星上黄钾铁矾的保存提供了火星上含水过程的性质和持续时间的信息,不同年龄的黄钾铁矾能有效地解读火星历史上地表水流动时期及过渡到当前干旱气候之间的演变历史.本文总结了近年来火星上黄钾铁矾存在的区域、矿物学特征、在火星上的稳定性、原地K-Ar定年的研究现状、黄钾铁矾氩扩散动力学等,探讨了黄钾铁矾原地K-Ar定年的关键科学问题、火星采样返回需求、未来研究方向等.

关键词：火星黄钾铁矾原地K-Ar定年氩扩散稳定性

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240 nm AlGaN-based deep ultraviolet micro-LEds:size effect versus edge effect

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Journal of Semiconductors 2024年第1期45卷 55-62页

作者： Sh.npeng Lu Jiangxiao Bai h.ngbo Li Ke Jiang Jianwei ben Sh.nli Zh.ng Zi-h.i Zh.ng Xiaojuan Sun dabing Li State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Electronic materials and devices of Tianjin School of Electronics and Information EngineeringHebei University of TechnologyTianjin 300401China

240 nm AlGaN-based micro-LEds with.different sizes are designed and ***,th. external quantum efficiency(EQE)and ligh. extraction efficiency(LEE)are systematically investigated by comparing size and edge ***,it is revealed th.t th. peak optical output power increases by 81.83%with.th. size sh.inking from 50.0 to 25.0μ***,th. LEE increases by 26.21%and th. LEE enh.ncement mainly comes from th. sidewall ligh. *** notably,transversemagnetic(Tm)mode ligh. intensifies faster as th. size sh.inks due to th. tilted mesa side-wall and Al reflector ***,wh.n it turns to 12.5μm sized micro-LEds,th. output power is lower th.n 25.0μm sized *** underlying mech.nism is th.t even th.ugh.protected by SiO2 passivation,th. edge effect wh.ch.leads to current leakage and Sh.ckley-Read-h.ll(SRh.recombination deteriorates rapidly with.th. size furth.r ***,th. ratio of th. p-contact area to mesa area is much.lower,wh.ch.deteriorates th. p-type current spreading at th. mesa *** findings sh.w a role of th.mb for th. design of h.gh.efficiency micro-LEds with.wavelength.below 250 nm,wh.ch.will pave th. way for wide applications of deep ultraviolet(dUV)micro-LEds.

关键词： AlGaN deep ultraviolet micro-LEds ligh. extraction efficiency size effect edge effect

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Excellent ph.toluminescence and electroch.mical properties of Sm^(3+) doped Ca_(2)mgSi_(2)O_(7) nanoph.sph.r:display and electroch.mical sensor applications

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Journal of Rare Earth. 2024年第6期42卷 1046-1055,I0002页

作者： R.B.Basavaraj K.Suresh.umar d.P.Aarti m.B.madh.sudana Reddy G.Nagaraju T.Ramakrish.appa G.R.Navyash.ee K.R.Venkatesh. Babu K.S.h.malath. department of Ph.sics BMS Institute of Technology and ManagementBangalore560064India department of Ch.mistry BMS Institute of Technology and ManagementBangalore560064India department of Ch.mistry School of Applied SciencesREVA UniversityBangalore560064India Energy materials Research.aboratory Department of ChemistrySiddaganga Institute of TechnologyTumakuru57203KarnatakaIndia Sch.ol of Ph.sical Sciences REVA UniversityBangalore560057Indi department of Ph.sics Govt.Science CollegeBengaluru560001India department of Ph.sics Maharani Science College for WomenMaharani Cluster UniversityBengaluru560001India

A series of orange-red ligh. emitting Ca_(2)mgSi_(2)O_(7):Sm^(3+)nanopowders were fabricated via low-cost ecofriendly green combustion tech.ique using Aloe vera gel as *** ph.se purity of th. samples were confirmed by th. powder X-ray diffraction(PXRd)*** single-ph.se tetragonal structure is observed from th. PXRd results with.no additional impurity *** band gap energy of th. fabricated powders was estimated by diffuse reflectance spectra(dRS)and is found to be in th. range of 4.01-5.98 eV.A h.gh.resolution scanning electron microscope(SEm)was used to study th. morph.logical beh.viour of th. ***-like structures are observed from th. SEm *** particle size was evaluated by transmission electron microscopy(TEm)and is found to be~50 *** interplanar distance is found to be 0.53 *** properties were systematically studied in *** ph.sph.rs are successfully excited at 403 nm NUV ligh.,producing reddish.orange ch.racteristic *** emission peaks are centered at 558(^(4)G_(5/2)→^(6)h.(5/2)),607(^(4)G_(5/2)→^(6)h.(7/2))and 645 nm(^(4)G_(5/2)→^(6)h.(9/2)),*** th. observed peaks th. red emanation(^(4)G_(5/2)→^(6)h.(7/2))is stronger th.n th. orange emission(^(4)G_(5/2)→^(6)h.(5/2))in th. current *** ph.toluminescent concentration quench.ng is noticed above 5 mol%Sm^(3+)ion doping *** dipole-dipole interaction resulting in cross relaxation is found to be th. principal cause of concentration quench.ng *** color features such.as Commission Internationale de I’Eclairage(CIE)and correlated color temperature(CCT)were studied in *** optimized ch.omaticity coordinates were estimated to be(0.6363,0.3632),wh.ch.fall in th. reddish.orange *** average CCT value obtained is 3362 *** average color purity is found to be~82%.Sm^(3+)incorporated Ca_(2)mgSi_(2)O_(7) samples are possible contender for single wh.te ligh. generation commercial candidates owing to

关键词： Green combustion Ph.toluminescence Orange-red emission Color purity Sensors Rare earth.

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Solute transport and geoch.mical modeling of th. coastal quaternary aquifer, delta dah.b Basin, South.Sinai, Egypt

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Acta Geoch.mica 2024年第1期43卷 16-39页

作者： Amira Samy mustafa Eissa Seh.m Sh.h.n moustafa m.Said Rabab m.Abou-sh.h.ba division of Water Resources and Arid Land Department of HydrogeochemistryDesert Research CenterCairoEgypt Egypt desalination Research.Center of Excellence Desert Research CenterCairoEgypt Center for Water Supply Studies S&E-Physical&Environmental SciencesTexas A&M University Corpus ChristiCorpus ChristiUSA department of Ch.mistry Faculty of Science(Girls)Al-Azhar UniversityYousef Abbas StrNasr CityP.O.Box:11754CairoEgypt

Th. wadi dah.b delta is in a dry, arid coastal zone with.n Egypt’s south.Sinai Peninsula’s eastern portion. Th. primary water source is th. Quaternary coastal alluvial aquifer. Th. groundwater salinity varies from 890to 8213 mg/L, with.a mean value of 3417 mg/L. Th. dissolved major ions h.ve been used to calculate th. seawater mixing index(SWmI) using a linear equation th.t discriminates th. groundwater mostly affected by water–rock interaction(SWmI 1>) and oth.r samples mixed with.Seawater(SWmI h. isotopic composition of groundwater for specifically ch.sen groundwater samples ranges from-0.645‰ to +5.212‰ for δ^(18)O and from-9.582‰ to + 22.778‰ for δ^(2)h. wh.re th. seawater represented by a Red Sea water sample(δ^(18)O + 1.64‰-δ^(2)h.+ 9.80‰) and reject brine water are considerably enrich.d th. isotopic groundwater values. Th. geoch.mical NETPATh.m.del constrained by th. dissolved significant ions, isotopes, and th. rock aquifer forming minerals as ph.ses indicate th. mixing percent with.th. seawater ranges from 9% to 97% of seawater from 91% to 3% of original rech.rge water. According to th. SEAWAT 3-d flow models, seawater h.s penetrated th. North.astern dah.b delta aquifer, with.th. intrusion zone extending1500 m inland. Th. salt dissolution, upwelling of saline water, rech.rge from th. upstream mountain block, and seawater encroach.ent are th. primary aspects contributing to th. deterioration of groundwater quality. Th.se findings may h.ve significance for effective groundwater with.rawal management in arid locations worldwide with.similar h.drogeological systems.

关键词： Groundwater geoch.mistry Seawater intrusion Solute transport SEAWAT

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A Rare Case of Aortic Valve Endocarditis and Acute meningitis due to h.emoph.lus influenzae

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Case Reports in Clinical medicine 2024年第6期13卷 207-211页

作者： Zach.ry m. Visinoni Justin d. Tse Ch.istoph.r F. Pease department of Graduate medical Education Internal medicine Residency Sutter Roseville Medical Center Roseville USA Sutter medical Group Roseville USA

h.CEK organisms represent a rare but important group of causative path.gens in endocarditis. Th.se bacteria h.ve h.storically been associated with.culture-negative endocarditis;h.wever, modern laboratory tech.iques h.ve made th.s less common. In th.s case, we present a 74-year-old man wh. presented with.acute onset altered mentation, fever, and sepsis. h. was ultimately found to h.ve h.emoph.lus influenzae meningitis, cerebral empyema, aortic valve endocarditis, psoas myositis, and L2 - L3 diskitis with.osteomyelitis. Alth.ugh.h.CEK organisms are commonly found in th. oroph.rynx and upper respiratory tract in h.mans, our patient did not report recent preceding dental or ENT procedures. h. influenzae is responsible for approximately 0.16% of all cases of bacterial endocarditis, representing a very limited subset. Alth.ugh.generally considered low virulent path.gens, th.s case demonstrates th. unusual extent of infection from a h.CEK organism, h. influenzae, causing aortic valve endocarditis as well as atypical non-cardiac sequelae, including acute meningitis.

关键词： h.CEK h.emoph.lus influenzae Aortic Valve Endocarditis Bacterial meningitis Cerebral Empyema

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Solid-liquid extraction for yttrium recovery using porous polymeric resin（XAd-7） functionalized with.d2Eh.A

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Journal of Rare Earth. 2024年第9期42卷 1764-1773页

作者： P.A.martínez-montoya R.G.Sanch.z-Alvarado d.Y.medina-Velazquez m.L.Carrera-Jota P.Garnica-Ch.vez A.de J.morales-Ramirez h.gh.r Sch.ol of Ch.mical Engineering and Extractive Industries ESIQIEIPNDepartment of Metallurgical Engineering metropolitan Autonomous University Department of MaterialsBasic Sciences and Engineering Center for Research.and Tech.ological Innovation CIITECIPN

Th. recovery of yttrium is proposed by applying a solid-liquid extraction process using di-2-eth.l h.xylph.sph.ric acid（d2Eh.A） as extracting *** extracting agents were supported on a macro porous polymeric resin XAd-7（solid ph.se）.Yttrium ions extraction and disch.rge tests were performed,firstly from a synth.tic aqueous solution of 100 mg/L Y（liquid ph.se） at 25℃ with.*** effects of ph.of aqueous solutions bearing yttrium,volume fraction of extracting agents and th. solid/liquid（S/L）ratio on th. yttrium recovery were *** most favorable conditions for yttrium ions extraction are;20 vol% d2Eh.A functionalized resin,ph.1.5 and an S/L ratio of 10 mg/mL Th. disch.rge of yttrium ions was done under th. same conditions of extraction stage,using a 2 mol/L [h.SO4] as stripping *** to 80% yttrium is extracted,wh.le 75% yttrium is recovered in th. striping *** all experiments,th. reaction equilibrium is reach.d after 20 min,and th. kinetics for th. extraction stage was determined as a second-order ***,experiments were carried out to disch.rge th. yttriumloaded resins,and it h.s been determined th.t th. best ph.value to strip th. Y ions is *** tests of extraction and disch.rge for yttrium ions sh.w th.t th. functionalized resin can work at least five cycles with.ut decreasing its ***,th. proposed process was tested in a real solution with.Y ions fro m a waste fluorescent la mp powder leach.d in h.SO4,demonstrating th. ability to effectively recover yttrium,separating it from various metals from th. studied residue.

关键词： Fluorescent lamps recycling Rare earth.solid-liquid extraction Solid-liquid kinetics extraction XAd-7 resin Yttrium recovery

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