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Impact of microbial communities from tropical soils on the mobilization of trace metals during dissolution of cinnabar ore

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Journal of Environmental Sciences 2017年第6期29卷 122-130页

作者： Clarisse Balland-Bolou-bi Benjamin Turc Vanessa Alphonse Noureddine Bousserrhine UniversitéParis-Est Crùteil Val de marne institute of Ecology and Enuironmental Sciences of Paris(UMR 7618)61 auenue du Général De Gaulle94010 Créteil cedexFrance

biodissolution experiments on cinnabar ore （mercury sulphide and other sulphide minerals, such as pyrite） were performed with microorganisms extracted directly from soil. These experiments were carried out in closed systems under aerobic and anaerobic conditions with 2 different soils sampled in French Guyana. The two main objectives of this study were （1） to quantify the ability of microorganisms to mobilize metals （Fe, A1, Hg） during the dissolution of cinnabar ore, and （2） to identify the links between the type and chemical properties of soils, environmental parameters such as season and the strategies developed by indigenous microorganisms extracted from tropical natural soils to mobilize metals, Results indicate that microbial communities extracted directly from various soils are able to （1） survive in the presence of cinnabar ore, as indicated by consumption of carbon sources and, （2） leach Hg from cinnabar in oxic and anoxic dissolution experiments via the acidification of the medium and the production of low molecular mass organic acids （LmmOAs）. The dissolution rate of cinnabar in aerobic conditions with microbial communities ranged from 4.8 x 10-4 to 2.6 x 10-3 μmol/m2/day and was independent of the metabolites released by the microorganisms. In addition, these results suggest an indirect action by the microorganisms in the cinnabar dissolution. Additionally, because iron is a key element in the dynamics of Hg, microbes were stimulated by the presence of this metal, and microbes released LmmOAs that leached iron from iron-bearing minerals, such as pyrite and oxy-hydroxide of iron, in the mixed cinnabar ore.

关键词： Low molecular mass organic acidsCinnabar oremicrobial communitiesTropical soils

A green method to synthesize flowerlike Fe(OH)3 microspheres for enhanced adsorption performance toward organic and heavy metal pollutants

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Journal of Environmental Sciences 2018年第11期30卷 47-57页

作者： Xiaole Zhao Yingehun Su Shubin Li Yajun bi Xiaojun Han State Key Laboratory of Urban Water Resource and Environment School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 China

Dyestuffs and heavy metal ions in water are seriously harmful to the ecological environment and human health. Three-dimensional （3D） flowerlike Fe（OH）3 microspheres were synthesized through a green yet low-cost injection method, for the removal of organic dyes and heavy metal ions. The Fe（OH）3 microspheres were characterized by thermal gravimetric analysis （TGA）, Fourier transform infrared （FT-IR}, and transmission electron microscopy （TEm） techniques. The adsorption kinetics of Congo Red （CR） on Fe（OH）3 microspheres obeyed the pseudo-second-order model. Cr6＋ and Pb2＋ adsorption behaviors on Fe（OH）3 microspheres followed the Langmuir isotherm model. The maximum adsorption capacities of the synthesized Fe（OH）3 were 308, 52.94, and 75.64 mg/g for CR, Cr6＋, and Pb2＋ respectively. The enhanced adsorption performance originated from its surface properties and large specific surface area of 250 m2/g. The microspheres also have excellent adsorption stability and recyclability. Another merit of the Fe（OH）3 material is that it also acts as a Fenton-like catalyst. These twin functionalities （both as adsorbent and Fenton-like catalyst） give the synthesized Fe（OH）3 microspheres great potential in the field of water treatment.

关键词： Water treatment Adsorption Green method Contaminant

modulation of tumor microenvironment by metal-organic-framework-derived nanoenzyme for enhancing nucleus-targeted photodynamic therapy

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Nano Research 2020年第6期13卷 1527-1535页

作者： Xuemei Zeng Shuangqian Yan Peng Chen Wei Du bi-Feng Liu The Key Laboratory for biomedical Photonics of mOE at Wuhan National Laboratory for Optoelectronics-Hubei bioinformatics&molecular Imaging Key Laboratory Systems Biology ThemeDepartment of Biomedical EngineeringCollege of Life Science and TechnologyHuazhong University of Science and TechnologyWuhan430074China

Photodynamic therapy(PDT)is a promising strategy for tumor ***,its therapeutic efficacy is compromised by the unsatisfactory cytotoxicity to specific subcellular organelles and insidious tumor microenvironment properties like hypoxia and high glutathione ***,we fabricated a novel nanoenzyme that derived from metal-organic framework(mOF)with intrinsic catalase-like activities to decompose H2O2 to O2 and simultaneous glutathione consumption for enhancing PDT *** obtained mn3O4 nanoparticle shows a larger pore size and surface area compared to native mOF particles,which can be used to load high dose *** decorated with AS1411 aptamer and polyethylene glycol(PEG),the obtained mn3O4-PEG@C&A particle exhibits excellent stability and cell nucleus targeting ***,mn3O4-PEG@C&A particle inhibited the tumor growth in the mouse model with high efficacy without any *** is the first report that applied mOF-derived nanoparticle to nucleus-targeted *** may provide a new approach for designing functional nanoenzyme to subcellular organelles-targeted tumor modulation.

关键词： nanoenzyme metal-organic framework catalase-like activity GSH consumption photodynamic therapy

Generation of Nb-enriched mafic rocks and associated adakitic rocks from the southeastern Central Asian Orogenic Belt:Evidence of crust-mantle interaction

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Geoscience Frontiers 2022年第2期13卷 255-274页

作者： Yan Jing Wenchun Ge m.Santosh Yu Dong Hao Yang Zheng Ji Junhui bi Hongying Zhou Dehe Xing College of Earth Sciences Jilin UniversityChangchun 130061China Key Laboratory of mineral Resources Evaluation in Northeast Asia Ministry of Land and Resources of ChinaChangchun 130026China School of Earth Sciences and Resources China University of Geosciences BeijingBeijing 100083China Department of Earth Science University of AdelaideAustralia Tianjin Center China Geological SurveyTianjin 300170China Shenyang Center China Geological SurveyShenyang 110034China

melting of subducting oceanic lithosphere and associated melt-mantle interactions in convergent plate margins require specific geodynamic environment that allows the oceanic slab to be abnormally *** we focus on the Early mesozoic mafic rocks and granite porphyry,which provide insights into slab melting processes associated with final closure of the Paleo-Asian *** granite porphyry samples are calc-alkaline and distinguished by high Sr contents,strong depletion of heavy rare earth elements,resulting in high(La/Yb);and Sr/Y ratios,and negligible Eu *** on their high Na_(2)O and mg O,low K_(2)O contents,positiveε_(Hf)(t)andε_(Nd)(t)and low(^(87)Sr/^(86)Sr)ivalues,we propose that the granite porphyry was likely derived from partial melting of subducting Paleo-Asian oceanic *** Nb-enriched mafic rocks are enriched in Rb,Th,U,Pb and K,and depleted in Nb,Ta,Ba,P and Ti,corroborating a subduction-related *** heterogeneous Sr-Nd-Hf-O isotopic compositions and other geochemical features suggest that they were likely derived from partial melting of peridotitic mantle wedge interacted with oceanic slab-derived adakitic *** element and isotope modeling results and elevated zirconδ^(18)O values suggest variable subducting sediments input into the mantle wedge,dominated by terrigenous *** the widely-developed bimodal rock associations,conjugated dikes,thermal metamorphism,tectonic characteristics,paleomagnetic constraints,and paleogeographical evidence along the Solonke-Changchun suture zone,we identify a slab window triggered by slab break-off,which accounts for slab melting and formation of the Nb-enriched mafic rocks and associated adakitic granite porphyry in southeastern Central Asian Orogenic Belt.

关键词： Early-middle Triassic Solonker-Changchun suture zone Nb-enriched mafic rocks Adakitic granite porphyry Slab melting

Synthesis of visible-light-driven TiO_(2) yolk-shell spheres with {001} facets dominated mesoporous shells

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Chinese Chemical Letters 2013年第3期24卷 260-263页

作者： Hui Wang bi-Li Wang Shu-Yun ma Institute of Science PLA University of Science&TechnologyNanjing 21101China

Anatase phase visible-light-driven TiO_(2) yolk-shell spheres with the size of ca.1-2 um have been synthesized with the combination of solvothermal and heat treatment ***,SEm,TEm,XPS,and PL analysis were used to examine structure and properties of the *** N species and Ti3+centers introduced into the as-prepared photocatalyst can enhance the visible light absorption *** mesoporous shell of the prepared photocatalyst,which promotes the pollutant adsorption ability,consists of the high-reactive[001]facets dominated *** to the unique structure,it is also observed that the as-prepared visible-light-driven TiO_(2) yolk-shell spheres exhibit a sunerinr nhnrncatalvtic activity for organic dyes decomposition than the well-known P25.

关键词： Titanium dioxide {001}Facet Photocatalysis Visible light

PRESSURE FLUCTUATIONS IN GAS-SOLIDS FLUIDIZED BEDS

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China Particuology 2003年第4期1卷 139-144页

作者： Hsiaotao bi Fluidization Research Centre Department of Chemical and Biological Engineering University of British Columbia 2216 Main Mall Vancouver BC V6T 1Z4 Canada

Pressure fluctuation data measured in a series of fluidized beds with diameters of 0.05, 0.1, 0.29, 0.60 and 1.56 m showed that the maximum amplitude or standard deviation increased with increasing the superficial gas velocity and static bed height for relatively shallow beds and became insensitive to the increase in static bed height in relatively deep beds. The amplitude appeared to be less dependent on the measurement location in the dense bed. Predictions based on bubble passage, bubble eruption at the upper bed surface and bed oscillation all failed to explain all observed trends and underestimated the amplitude of pressure fluctuations, suggesting that the global pressure fluctuations in gas-solids bubbling fluidized beds are the superposition of local pressure variations, bed oscillations and pressure waves generated from the bubble formation in the distributor region, bubble coalescence during their rise and bubble eruption at the upper bed surface.

关键词： bubbling fluidized beds pressure fluctuations maximum pressure amplitude pressure waves scaleup effect

The　Rmodynamic　Study　on　the　Aqueous　Complexation　of　metal　CationswithN－aceticAcidSubstitutedTetraazamacrocycle

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Chinese Chemical Letters 1996年第9期7卷 862-863页

作者： bi, JH Xie, FX Chen, LQ Ni, SS ANHUI INST EDUC DEPT CHEMHEFEI 230061PEOPLES R CHINA ANHUI UNIV DEPT CHEMHEFEI 230039PEOPLES R CHINA

The stability constants of the 1:1 complexes of H4L (5.12-diphenyl-7.14-dimethyl-1,4,8,11-tetraazamacrocyclotetradecane-N',N',N'',N''-tetraacetic acid) with m(2-) ions (m=***,Co,Zn,mn,***,***,Ba) were determined in 0.5 mol L KCl aqueous solution at 45℃,50℃ and 60℃ by potentiometric titration and computer fitting. The △H and △S of the coordination reaction in the solution were given.

关键词： Complexation metal Aqueous

Grids of rotating stellar models with masses between 1.0 and 3.0 m_⊙

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Research in Astronomy and Astrophysics 2013年第5期13卷 579-592页

作者： Wu-ming Yang Shao-Lan bi Xiang-Cun meng Department of Astronomy Beijing Normal University School of Physics and Chemistry Henan Polytechnic University

We calculated a grid of evolutionary tracks of rotating models with masses between 1.0 and 3.0 m⊙ and resolution δm 〈 0.02 m⊙, which can be used to study the effects of rotation on stellar evolution and on the characteristics of star clusters. The value of ～ 2.05 me is a critical mass for the effects of rotation on stellar struc- ture and evolution. For stars with m 〉 2.05 me, rotation leads to an increase in the convective core and prolongs their lifetime on the main sequence （mS）; rotating mod- els evolve more slowly than non-rotating ones; the effects of rotation on the evolution of these stars are similar to those of convective core overshooting. However for stars with 1.1 〈 m/m⊙ 〈 2.05, rotation results in a decrease in the convective core and shortens the duration of the mS stage; rotating models evolve faster than non-rotating ones. When the mass has values in the range ～ 1.7 - 2.0 m⊙, the mixing caused by rotationally induced instabilities is not efficient; the hydrostatic effects dominate pro- cesses associated with the evolution of these stars. For models with masses between about 1.6 and 2.0 m⊙, rotating models always exhibit lower effective temperatures than non-rotating ones at the same age during the mS stage. For a given age, the lower the mass, the smaller the change in the effective temperature. Thus rotations could lead to a color spread near the mS turnoff in the color-magnitude diagram for intermediate-age star clusters.

关键词： stars: evolution -- stars: rotation m stars: interiors

magnetoelectric cylindrical layered composite structure with multi-resonance frequencies

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Science China(Technological Sciences) 2013年第10期56卷 2572-2575页

作者： bi Ke DONG GuoYan PAN DeAn ZHOU Ji State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University College of materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences School of materials Science and Engineering University of Science and Technology Beijing

A combined mE composite structure is made of several cylindrical layered composites in series or parallel *** to the cylindrical structure,the combined structure does not need more *** characteristics of multi-resonance frequencies have been *** resonance frequency of the structure can be adjusted by changing the cylinder diameter of the corresponding cylindrical layered *** number of resonance frequencies increases as the number of cylindrical layered composites *** multi-resonance frequencies behavior makes these cylindrical layered composite structures suitable for applications in multifuctional devices with multi-frequencies operation.

关键词： functional composites magnetoelectric multi-resonance frequencies