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Core-shell nanoparticle enhanced Raman spectroscopy in situ probing the composition and evolution of interfacial species on PtCo surfaces

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Nano Research 2024年第6期17卷 4687-4692页

作者： Jing Liu Han-Liang Zhong Xiangyu Li Mu-Fei Yue Wei-Min Yang Xueqiu You Jing-Hua Tian Yao-Hui Wang Jian-Feng Li Fujian Provincial Key laboratory of Oceanic Information Perception and Intelligent Processing School of Ocean Information EngineeringJimei UniversityXiamen 361021China College of Chemistry Fuzhou UniversityFuzhou 350108China State Key laboratory of Physical Chemistry of Solid Surfaces MOE Key Laboratory of Spectrochemical Analysis and InstrumentationiChEMCollege of Chemistry and Chemical EngineeringCollege of MaterialsCollege of EnergyXiamen UniversityXiamen 361005China Innovation laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518000China

The composition and evolution of interfacial species play a key role during electrocatalytic *** the structural evolution and intermediate during catalytic process by in situ characterization can shed new light on the electrocatalytic reaction mechanism and develop highly efficient ***,directly probing the interfacial species is extremely difficult for most spectroscopic techniques due to complicated interfacial environment and ultra-low surface ***,electrochemical core-shell nanoparticle enhanced Raman spectroscopy is utilized to probe the composition and evolution processes of interfacial species on Au@Pt,Au@Co,and Au@PtCo core-shell nanoparticle *** spectral evidences of interfacial intermediates including hydroxide radical(OH*),superoxide ion(O_(2)^(−)),as well as metal oxide species are directly captured by in situ Raman spectroscopy,which are further confirmed by the both isotopic experiment and density functional theory *** results provide a mechanistic guideline for the rational design of highly efficient electrocatalysts.

关键词： in situ Raman core-shell nanoparticle PtCo interfacial species composition and evolution

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Distribution of Some Elements in the Egyptian Black Sands from Abu Khashaba Beach Area

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Journal of Analytical Sciences, Methods and Instrumentation 2013年第1期3卷 62-66页

作者： H. H. Mahmoud A. M. Abdel-Lateef A. M. Attiah central laboratory for elemental and isotopic analysis Nuclear Research Center Cairo Egypt central laboratory for elemental and isotopic analysis Nuclear Research Center Cairo Egypt Physics Department Faculty of Science and Human Studies Shaqra University Shaqra KSA.

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) technique was used to determine the concentrations of titanium (Ti), vanadium (V), Chromium (Cr), Manganese (Mn), iron (Fe), zinc (Zn), arsenic (As), zirconium (Zr), cadmium (Cd) and hafnium (Hf) in black sands samples. 18 black sands samples were collected from the Mediterranean coast-Abu Khashabou Rosetta area, Egypt. Alkaline fusion procedure using mixture of Li-meta borate and tetra borate was used for the digestion of black sands samples. The average concentrations of Ti, V, Cr, Mn, Fe, Zn, As, Zr, Cd and Hf were 435.06 ppm, 322.32 ppm, 2515.03 ppm, 596.45 ppm, 185894 ppm, 249.95 ppm,309.32 ppm, 1077.26 ppm, 33.56 ppm and 3520.32 ppm, respectively. The procedure was tested with Basalt Hawaiian Volcanic Observatory (BHVO-2) standard reference material.

关键词： Alkaline Fusion Black Sand ICP-MS Rosetta Branch

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Experiment and analysis of Compatibility between New Phase Change Mixed Molten Salt and 316L Stainless Steel

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Journal of Thermal Science 2024年第6期33卷 2259-2273页

作者： REN Chenxing ZHENG Chenghang GAO Xiang State Key laboratory of Clean Energy Utilization Zhejiang University Institute of Carbon Neutrality Zhejiang University Baima Lake laboratory Zhejiang University

Molten salt is considered as a promising heat storage and heat transfer medium due to its efficient thermophysical *** order to study the compatibility of five new mixed molten salts obtained with KNO3,NaNO3,K2CO3,Ca（NO3）2·4H2O,ZnCl2,NaF,Na2CO3,NaCl and MgO as materials and 316L stainless steel,corrosion weight loss,scanning electron microscopy,elemental analysis and XRD were used to analyze the compatibility of 316L stainless steel in the new mixed molten salt at different time and *** corrosion behavior under the conditions was studied and *** compatibility data was obtained,and the corrosion mechanism of 316L stainless steel in mixed molten salts was *** results show that the corrosion weight of 316L stainless steel increases,and the corrosion degree of grain,crystal crack depth and oxidation degree increase gradually with the increase of temperature and *** corrosion of molten salt on alloy is mainly caused by the selective diffusion loss and corrosion of Cr,Fe and other elements,and is accompanied by the formation of different metal *** formation of metal oxides can slow down metal corrosion and loss to a certain *** corrosion results under different working conditions show that 316L stainless steel has good compatibility with the new mixed molten salt,and has certain application value in the field of heat transfer and energy storage.

关键词： 316L stainless steel corrosion resistance heat treatment molten salt

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Ultra Sensitive Determination and Preconcentration of Cd2+, Cu2+and Pb2+after Multi-Walled Carbon Nanotubes Adsorption

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Journal of Analytical Sciences, Methods and Instrumentation 2013年第1期3卷 8-12页

作者： Ashraf Mohamed Abdel-Lateef Ramadan Abdel-Wahed Mohamed Hazem Hassan Mahmoud central laboratory for elemental and isotopic analysis Nuclear Research Center Atomic Energy Authority Cairo Egypt central laboratory for elemental and isotopic analysis Nuclear Research Center Atomic Energy Authority Cairo Egypt Chemistry Department Faculty of Science Jazan University Jazan KSA central laboratory for elemental and isotopic analysis Nuclear Research Center Atomic Energy Authority Cairo Egypt Physics Department Faculty of Science and Human Studies Shaqra University Shaqra KSA

Multi-Walled carbon nanotubes are used as preconcentrating probes for the quantitative determination of trace cadmium, copper and lead in environmental and biological sample using graphite Furnace Atomic Absorption Spectrometry and inductively coupled Plasma Optical Emission spectrometry. The method is based on the electrostatic interactions of positively charged Cd+, Cu+ and Pb+ with the negatively charged multi-walled carbon nanotubes (MWCNTs) for the preconcentration and isolation of analytes from sample solutions. Effective preconcentration of trace cadmium, copper and lead was achieved in a pH range of 5 - 7, 5 - 7 and 4 - 7, respectively. The retained cadmium, copper and lead were efficiently eluted with 0.3 mol·L-1 HCl for graphite Furnace Atomic Absorption Spectrometry determination. The multi-walled carbon nanotubes packed micro-column exhibited fairly fast kinetics for the adsorption of cadmium, copper and lead, permitting the use of high sample flow rates up to at least 3 mL·min-1 for the flow injection on micro-column preconcentration without the loss of the retention efficiency. The detection limits (3σ) were 0.03, 0.01 and 0.5 ng·mL-1 for Cd, Cu and Pb, respectively. The relative standard deviation under optimum condition is less than 2.9% (n = 10). The developed method was successfully applied to the determination of trace Cd, Cu and Pb in a variety of environmental and biological samples.

关键词： Multi-Walled Carbon Nanotubes Graphite Furnace Atomic Absorption Spectrometry Inductively Coupled Plasma Optical Emission Spectrometry

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Evolution of Diagenetic Fluid of the Dawsonite-Bearing Sandstone in the Jiyang Depression,Eastern China

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Journal of Ocean University of China 2024年第1期23卷 80-98页

作者： LI Fulai MA Wenkuan ZHANG Chun WANG Kaining National Key laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao 266580China laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China Shandong Geological Exploration Institute of China Chemical Geology and Mine Bureau Jinan 250013China

Based on the petrology,isotope geochemistry and fluid inclusions analysis,we established the evolutionary mode of the diagenetic fluid of dawsonite-bearing sandstone in the Jiyang ***-bearing sandstone is characterized by double injection of CO_(2)and oil-gas in the Jiyang Depression that have experienced a relatively complex diagenetic fluid evolution *** diagenetic sequence of secondary minerals involves secondary enlargement of quartz,kaolinite,first-stage calcite,dawsonite,second-stage calcite,ferrocalcite,dolomite and *** charging in the dawsonite-bearing sandstone occurred at around 2.6–0 *** CO_(2)charging event occurred during Dongying tectonism,forming the Pingfangwang CO_(2)gas reservoir,which provided an abundant carbon source for dawsonite *** and oxygen isotopic compositions of dawsonite demonstrate that CO_(2)forming the dawsonite was of an inorganic origin derived from the mantle,and that water mediating the proc-ess during dawsonite precipitation was sequestered brine with a fluid temperature of 82℃.The evolutionary sequence of the diagenetic fluid in the dawsonite-bearing sandstone was:alkaline syngenetic fluids,weak alkaline fluids during organic acid forma-tion,acidic fluids in the early stage of CO_(2)injection,alkaline fluids in the late stage of CO_(2)injection,and weak alkaline fluids during oil and gas *** mode indicates an increase in-HCO_(3)because of the CO_(2)injection,and the loss of Ca^(2+)and Mg^(2+)due to the precipitation of carbonate ***,the evolutionary mode of diagenetic fluids is in good agreement with high HCO_(3)^(-),low Ca^(2+)and low Mg^(2+)composition of the present formation water in the dawsonite-bearing sandstone.

关键词： evolution of diagenetic fluid dawsonite CO_(2)injection and hydrocarbon charging mineral diagenetic sequence iso-topic geochemistry fluid inclusions

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Lithium Isotope Analytical Methods and Implications for Rare-Metal Mineralization in Granite-Pegmatite Systems: An Overview

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Journal of Earth Science 2024年

作者： Xiang-Ying Ye Bin Li Dong-Bo Tan Ke-Cheng Liu Zhi-Yong Zhu Hafiz Muhammad Siddique Yi-Lin Xiao Key laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Ministry of Education)， School of Geosciences and Info-physics， central South University CAS Key laboratory of Geospace Environment and Department of Plasma Physics and Fusion Engineering， University of Science and Technology of China Institute of Geology， Chinese Academy of Geological Sciences CAS Key laboratory of Crust-Mantle Materials and Environments， School of Earth and Space Sciences， University of Science and Technology of China Chinese Academy of Sciences Center of Excellence in Comparative Planetology

The origin of highly-fractionated granite-pegmatite systems and their associated rare metal mineralization has been widely studied， but there is still ongoing debate. Prevailing hypotheses suggest that pegmatite formation and the associated rare metal mineralization are closely related to aqueous fluid processes. Lithium (Li) isotope analysis has been widely applied to trace granite-pegmatite evolution. This is because lithium is widely present in various minerals (e.g.， mica， tourmaline) that record the melt and fluid compositions， and lithium isotopes are sensitive to magmatic-hydrothermal processes. We briefly review the methodology of Li isotope analyses， the mechanisms of Li isotopic fractionation， and， in particular， Li isotope fractionation in granite-pegmatite system based on Li isotope data we have collected and the latest developments in Li isotope geochemistry. With the development of analytical technology， high-precision measurement of the Li content and isotopic compositions have facilitated a series of scientific breakthroughs in understanding the magmatic-hydrothermal evolution of rare-element ore deposits. Li isotope analysis on bulk mineral separates show ability to trace various hydrothermal processes (e.g. exotic or exsolved fluids). In situ Li isotope analysis methods has been enhanced by the development of new， homogeneous mineral reference materials. In situ SIMS and LA-MC-ICP-MS Li isotope measurements on minerals (e.g.， tourmaline) will likely become more important in studying the fluid–rock interactions in magmatic， metamorphic， and hydrothermal processes， as well as on pegmatite petrogenesis and rare-metal mineralization.

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Copper isotope constraints on the origins of basaltic and andesitic magmas in the Tengchong volcanic field,SE Tibet

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Geoscience Frontiers 2024年第4期15卷 290-303页

作者： Yuan-Ru Qu Sheng-Ao Liu State Key laboratory of Geological Processes and Mineral Resources China University of GeosciencesBeijing 100083China

The Tengchong volcano field(TVF),situated at the southeastern margin of the Tibetan Plateau,holds crucial information regarding Cenozoic volcanic activities and geotectonic evolution of the SE *** provide new constraints on petrogenesis and evolution of the Tengchong volcanism,here we conducted copper(Cu)elemental and isotopic analyses on a suite of samples that document the evolution from basalts to andesites in the *** basalts are Cu-depleted(29.7-36.9 ppm)and have higherδ65Cu val-ues(0.19‰-0.40‰,mean=0.31‰±0.05‰;n=11)than those of mid-ocean ridge basalts(MORBs,~0.09‰)and the mantle(~0.06‰)as well as the majority of island arc *** with the low Cu/Zr ratios,these characteristics are interpreted to reflect the fractionation of isotopically light sulfides in the S-saturated systems during magma ascent,rather than source heterogeneity induced by recycled materials and redox *** with the basalts,the andesites have slightly lower Cu contents(14.4-29.4 ppm)and lighter Cu isotopic compositions(mean=-0.14‰±0.06‰;n=13).These differences cannot be attributed to progressive sulfide fractionation of basaltic magmas but require the assimilation of lower crustal materials with lowδ65Cu values during evolution of the andesitic *** results collectively suggest that Cu isotopes can provide valuable insights into magma origin and evolution.

关键词： Copper isotopes Sulfide segregation Magmatic differentiation Tengchong volcanic field

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A bulk extraction method to determine the stable isotope ratios of iron,nickel,copper,zinc,and cadmium in seawater using multi-collector inductively coupled plasma mass spectrometry

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Acta Oceanologica Sinica 2024年第7期43卷 125-137页

作者： Zhan Shen Yuncong Ge Jiahui Liu Wenkai Guan Wenfeng Hu Ruifeng Zhang School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China Southern Marine Science and Engineering Guangdong laboratory(Zhuhai) Zhuhai 519015China Shanghai Key laboratory of Polar Life and Environment Sciences Shanghai Jiao Tong UniversityShanghai 200030China Key laboratory of Polar Ecosystem and Climate Change of Ministry of Education Shanghai Jiao Tong UniversityShanghai 200030China laboratory for Polar Science Polar Research Institute of ChinaMinistry of Natural ResourcesShanghai 200136China

The oceanic trace metals iron(Fe),nickel(Ni),copper(Cu),zinc(Zn),and cadmium(Cd)are crucial to marine phytoplankton growth and global carbon cycle,and the analysis of their stable isotopes can provide valuable insights into their biogeochemical cycles within the ***,the simultaneous isotopic analysis of multiple elements present in seawater is challenging because of their low concentrations,limited volumes of the test samples,and high salt *** this study,we present the novel method developed for the simultaneous analysis of five isotope systems by 1 L seawater *** the developed method,the NOBIAS Chelate-PA1 resin was used to extract metals from seawater,the AG MP-1M anion-exchange resin to purify Cu,Fe,Zn,Cd,and the NOBIAS Chelate-PA1 resin to further extract Ni from the matrix ***,a multi-collector inductively coupled plasma mass spectroscope(MC-ICPMS)was employed for the isotopic measurements using a doublespike technique or sample-standard bracketing combined with internal *** method exhibited low total procedural blanks(0.04 pg,0.04 pg,0.21 pg,0.15 pg,and 3 pg for Ni,Cu,Fe,Zn,and Cd,respectively)and high extraction efficiencies(100.5%±0.3%,100.2%±0.5%,97.8%±1.4%,99.9%±0.8%,and 100.1%±0.2%for Ni,Cu,Fe,Zn,and Cd,respectively).The external errors and external precisions of this method could be considered *** proposed method was further tested on the seawater samples obtained from the whole vertical profile of a water column during the Chinese GEOTRACES GP09 cruise in the Northwest Pacific,and the results showed good agreement with previous related *** innovative method will contribute to the advancement of isotope research and enhance our understanding of the marine biogeochemical cycling of Fe,Ni,Cu,Zn,and Cd.

关键词： trace metal stable isotopes seawater bulk extraction

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Nonmetallic modified zero-valent iron for remediating halogenated organic compounds and heavy metals: A comprehensive review

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Environmental Science and Ecotechnology 2024年第5期21卷 34-46页

作者： Zimin Yan Jia Ouyang Bin Wu Chenchen Liu Hongcheng Wang Aijie Wang Zhiling Li State Key laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090PR China State Key laboratory of Urban Water Resource and Environment School of Civil and Environmental EngineeringHarbin Institute of Technology ShenzhenShenzhen518055PR China

Zero-valent iron(ZVI),an ideal reductant treating persistent pollutants,is hampered by issues like corrosion,passivation,and suboptimal *** advancements in nonmetallic modified ZVI(NM-ZVI)show promising potential in circumventing these challenges by modifying ZVI's surface and internal physicochemical *** its promise,a thorough synthesis of research advancements in this domain remains *** we review the innovative methodologies,regulatory principles,and reduction-centric mechanisms underpinning NM-ZVI's effectiveness against two prevalent persistent pollutants:halogenated organic compounds and heavy *** start by evaluating different nonmetallic modification techniques,such as liquid-phase reduction,mechanical ball milling,and pyrolysis,and their respective *** discussion progresses towards a critical analysis of current strategies and mechanisms used for NM-ZVI to enhance its reactivity,electron selectivity,and electron utilization *** is achieved by optimizing the elemental compositions,content ratios,lattice constants,hydrophobicity,and ***,we propose novel approaches for augmenting NM-ZVI's capability to address complex pollution *** review highlights NM-ZVI's potential as an alternative to remediate water environments contaminated with halogenated organic compounds or heavy metals,contributing to the broader discourse on green remediation technologies.

关键词： Nonmetallic modified zero-valent iron Halogenated organic compounds Heavy metals Reductive removal Regulation strategies Electron selectivity

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Sedimentary paleoenvironment and its control on organic matter enrichment in the Mesoproterozoic hydrocarbon source rocks in the Ordos Basin, southern margin of the North China Craton

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Petroleum Science 2024年第4期21卷 2257-2272页

作者： Zhi-Chen Wu Ju-Ye Shi Tai-Liang Fan Ming Jiang School of Energy Resources China University of Geosciences (Beijing) Key laboratory of Marine Reservoir Evolution and Hydrocarbon Enrichment Mechanism Ministry of Education China University of Geosciences (Beijing)

The black shale of the Mesoproterozoic Cuizhuang Formation in the Changcheng System in Yongji city,North China Craton, is a potential source rock. Understanding the organic matter enrichment mechanism is crucial for evaluating source rock resources and understanding oil and gas accumulation *** this study, we evaluated the sedimentary paleoenvironment and organic matter enrichment mechanisms of shale using thin section observations, mineral composition analysis, organic geochemistry, and elemental geochemistry. We found significant differences in the sedimentary paleoenvironment and organic matter enrichment mechanisms between the lower Cuizhuang Formation and the Beidajian Formation shale. The Cuizhuang Formation was deposited in a late-stage, restricted basin environment during the rift phase, and elemental and geochemical indicators showed that the Cuizhuang Formation was in a suboxic-anoxic water environment, that was influenced by a warm and humid paleoclimate and submarine hydrothermal activities, which promoted the accumulation of organic matter. However, the enrichment of organic matter in the Cuizhuang Formation was mainly controlled by redox *** formation of suboxic-anoxic water environments may be closely related to the warm and humid paleoclimate and submarine hydrothermal activities. Warm conditions promote continental weathering and increase marine productivity, thereby consuming oxygen in the bottom water. Moreover, acidic hydrothermal activity also helps to establish an anoxic environment. Our results reveal the effects controlling various coupled mechanisms dominated by redox conditions, which may explain the development of source rocks in the Cuizhuang Formation.

关键词： Cuizhuang formation Paleoproterozoic source rocks Marine productivity Paleoenvironments Submarine hydrothermal activity Organic matter enrichment

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