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Enhancement of CO_(2)photoreduction efficiency by supporting blue TiO_(2)with photonic crystal substrate

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Nano Research 2023年第7期16卷 9310-9317页

作者： Dengpeng Lan Wenting Sheng Qianqian Fu jianping ge School of Chemistry and Molecular Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesEast China Normal UniversityShanghai 200062China Institute of Eco-Chongming Shanghai 202162China

The catalytic performance of TiO_(2)in photoreduction of CO_(2)is limited by its weak absorption in the visible range.In this work,a photonic crystal supported blue TiO_(2)photocatalyst(BTPC)was prepared to demonstrate a 5-6 times higher activity and improved CH_(4)selectivity compared to the BT catalysts deposited on quartz plate.By investigating the influence of the reflection intensity and wavelength of PC support,the superior catalytic performance was found to be originated from the enhanced light absorption of BT and the increased surface electron density brought by the PC support.Based on the study of BT loading on support,multilayer BTPC catalyst was designed to take the most advantage of the transmitted light and achieve a higher conversion of CO_(2)in the unit area of irradiation.

关键词： blue TiO_(2) photocatalyst photonic crystal support CO_(2) photo reduction

Highly dispersed Ni/MgO-mSiO_(2)catalysts with excellent activity and stability for dry reforming of methane

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Nano Research 2022年第6期15卷 5004-5013页

作者： Fang Zeng Juan Zhang Run Xu Rongjun Zhang jianping ge Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China Department of Coal and Syngas Conversion Research Institute of Petroleum ProcessingSINOPECBeijing 100083China

Highly dispersed Ni catalyst and alkaline promoters supported by mesoporous SiO_(2)nanospheres were synthesized and applied as an active and stable catalyst for dry reforming of methane(DRM).The as-prepared Ni/MgO-mSiO_(2)catalyst showed stable conversions of CH4 and CO_(2)around 82%and 85%in 120 h of DRM reaction,which was superior in performance compared to similar catalysts in literatures.Based on the transmission electron microscope(TEM)images,energy-dispersive spectroscopy(EDS),CO-pulse adsorption,temperature programmed reduction of the oxidized catalysts by hydrogen(H_(2)-TPR),X-ray photoelectron spectroscopy(XPS),temperature-programmed desorption of CO_(2)(CO_(2)-TPD),and thermal gravitational analysis(TGA),the promotion effect of MgO on the Ni catalyst was systematically studied.The introduction of Mg^(2+)in synthesis enhanced the interaction between Ni^(2+)and mSiO_(2),which led to a high dispersion of active centers and a strong“metal–support”interactions to inhibit the sintering and deactivation of Ni at reaction temperatures.On the other hand,Ni and MgO nanoparticles formed adjacently on mSiO_(2),where the“Ni-MgO”interface not only improved the Ni0 distribution and promoted the cracking of CH_(4)but also promoted the activation of CO_(2)and the elimination of carbon deposits.A high and stable conversion of CH4 and CO_(2)were then achieved through the synergistic effect of Ni catalyst,MgO promoter,and mSiO_(2)support.

关键词： Ni-based catalyst dry reforming of methane mesoporous SiO_(2) MgO alkaline

Addressing the impact of canine distemper spreading on an isolated tiger population in northeast Asia

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Integrative Zoology 2023年第6期18卷 994-1008页

作者： Dawei WANG James L.D.SMITH Francesco ACCATINO jianping ge Tianming WANG Ministry of Education Key Laboratory for Biodiversity Science and Engineering NFGA Key Laboratory for Conservation Ecology of Northeast Tiger and Leopard&College of Life SciencesBeijing Normal UniversityBeijingChina Department of Fisheries Wildlife and Conservation BiologyUniversity of MinnesotaSt.PaulMNUSA UMR SADAPT INRAEAgroParisTechUniversitéParis-SaclayPALAISEAU CedexFrance

The continuation of the isolated Amur tiger(Panthera tigris altaica)population living along the China-Russia border is facing serious challenges due to factors such as its small size(including 38 individuals)and canine distemper virus(CDV).We use a population viability analysis metamodel,which consists of a traditional individual-based demographic model linked to an epidemiological model,to assess options for controlling the impact of negative factors through domestic dog management in protected areas,increasing connectivity to the neighboring large population(including more than 400 individuals),and habitat expansion.Without intervention,under inbreeding depression of 3.14,6.29,and 12.26 lethal equivalents,our metamodel predicted the extinction within 100 years is 64.4%,90.6%,and 99.8%,respectively.In addition,the simulation results showed that dog management or habitat expansion independently will not ensure tiger population viability for the next 100 years,and connectivity to the neighboring population would only keep the population size from rapidly declining.However,when the above three conservation scenarios are combined,even at the highest level of 12.26 lethal equivalents inbreeding depression,population size will not decline and the probability of extinction will beger necessitates a multifaceted synergistic effort.Our key management recommendations for this population underline the importance of reducing CDV threats and expanding tiger occupancy to its former range in China,but re-establishing habitat connectivity to the neighboring population is an important long-term objective.

关键词： Amur tiger canine distemper virus habitat connectivity metamodel population viability analysis(PVA)

Synthesis of Fe-doped carbon hybrid composed of CNT/flake-like carbon for catalyzing oxygen reduction

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Nano Research 2022年第7期15卷 6670-6677页

作者： Fangfang Tang Wei Xia Hongjuan Zhang Lingling Zheng Yingji Zhao jianping ge Jing Tang School of Chemistry and Molecular Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesEast China Normal UniversityShanghai 200062China Department of Nanoscience and Nanoengineering Faculty of Science and EngineeringWaseda UniversityShinjukuTokyo 169-8555Japan JST-ERATO Yamauchi Materials Space-Tectonics Project Kagami Memorial Research Institute for Materials Science and TechnologyWaseda UniversityShinjukuTokyo 169-0051Japan Institute of Eco-Chongming Shanghai 202162China

Carbon-based materials with tunable properties have emerged as promising candidates to replace Pt-based catalysts for accelerating oxygen reduction reaction(ORR)in fuel cells or metal-air batteries.In this work,we constructed a carbon hybrid which consists of one-dimensional(1D)carbon nanotubes and flake-like carbons by pyrolysis of leaf-like metal-organic frameworks.The optimal hybrid electrocatalyst of Fe_(7%)-L-CNT-900 possesses the desired features for ORR,including active Fe species,high degree of graphitization,large specific surface area,and hierarchical porous structures.Consequently,Fe_(7%)-L-CNT900 performs a high electrocatalytic activity for ORR with a half-wave potential of 0.88 V,which is comparable to that of Pt/C(20 wt.%).This strategy provides an insight into the investigation of highly efficient and low-cost composite electrocatalyst for oxygen reduction reaction.

关键词： metal-organic frameworks porous carbon/CNT composites Fe-based active sites electrocatalyst oxygen reduction reaction

High-Precision Colorimetric Sensing by Dynamic Tracking of Solvent Diffusion in Hollow-Sphere Photonic Crystals

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Research 2022年第3期2022卷 397-407页

作者： Qianqian Fu jianping ge Chen Chen Zichen Wang Fan Yang Yadong Yin Department of Chemistry University of CaliforniaRiversideCaliforniaUSA CA 92521 School of Chemistry and Molecular Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesEast China Normal UniversityShanghaiChina 200062 Institute of Eco-Chongming ShanghaiChina 202162

Expensive instruments and complicated data processing are often required to discriminate solvents with similar structures and properties.Colorimetric sensors with high selectivity,low cost,and good portability are highly desirable to simplify such detection tasks.Herein,we report the fabrication of a photonic crystal sensor based on the self-assembled resorcinol formaldehyde(RF)hollow spheres to realize colorimetric sensing of polar solvents,including homologs and isomers based on the saturated diffusion time.The diffusion of solvent molecules through the photonic crystal film exhibits a unique three-step diffusion profile accompanied by a dynamic color change,as determined by the physicochemical properties of the solvent molecules and their interactions with the polymer shells,making it possible to accurately identify the solvent type based on the dynamic reflection spectra or visual perception.With its superior selectivity and sensitivity,this single-component colorimetric sensor represents a straightforward tool for convenient solvent detection and identification.

关键词： properties. diffusion selectivity

Confined reaction inside nanotubes： New approach to mesoporous g-C3N4 photocatalysts

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Nano Research 2017年第11期10卷 3638-3647页

作者： Xueteng Liu Fei Pang Mingyuan He jianping ge Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China

Mesoporous g-C3N4 nanorods （NRs） are synthesized through the nano-confined thermal condensation of cyanamide in silica nanotubes （NTs） with porous shells.The gas bubbles retained during condensation and the limited cyanamide precursor inside the silica NTs lead to the formation of mesoporous g-C3N4.This nano-confined reaction is an alternative method to the traditional templating process for the synthesis of mesoporous materials.The as-prepared mesoporous g-C3N4 NRs exhibit remarkably improved photocatalytic activity and high stability in water splitting and degradation of Rhodamine B compared with bulk g-C3N4.

关键词： photocatalysis,g-C3N4,confined reaction,mesoporous

Elusive cats in our backyards:persistence of the North Chinese leopard(Panthera pardus japonensis)in a human-dominated landscape in central China

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Integrative Zoology 2021年第1期16卷 67-83页

作者： Haitao YANG Bing XIE Guojing ZHAO Yinan GONG Pu MOU jianping ge Limin FENG National Forestry and Grassland Administration Amur Tiger and Amur Leopard Monitoring and Research Center Northeast Tiger and Leopard Biodiversity National Observation and Research StationMinistry of Education Key Laboratory for Biodiversity Science and EngineeringCollege of Life SciencesBeijing Normal UniversityBeijingChina Behavioural Ecology Group Section for Ecology and EvolutionDepartment of BiologyUniversity of CopenhagenDenmark

The North Chinese leopard(Panthera pardus japonensis),the least-known big cat,disappeared in most historical range for decades,following the development of modern civilization.Unfortunately,we have scarce knowledge about the status of this big cat so far,apart from anecdotal reports.In this study,we investigated density,distribution,and habitat use of the leopard,the apex predator,in a complex forest landscape in the Loess Plateau.We used a camera-trapping network to obtain population estimates for leopards over 2 years through spatially explicit capture-recapture models.Our results,based on maximum likelihood and Bayesian/MCMC methods,reveal that the largest wild population of the leopard was found widely distributed in remnant forests in central Loess plateau.The population is increasing in our study area,and the density of leopards(1.70(SE=0.48)−2.40(SE=0.67)/100 km^(2))is higher than other areas of China.According to the analysis of 2 seasonal occupancy models,prey species drive partially the leopard habitat use,predicting that the big cat thrives from the recovery of prey community.However,human disturbances,especially oil wells,seem to have negative impacts on the habitat use of leopards.Specifically,it is necessary to have joint efforts by the government and researchers to improve human disturbances management and prey species population density,as well as strengthen the investment in research on the North Chinese leopard,which could all further strengthen protection ability and ensure the long-term survival of this species.

关键词： habitat use North Chinese leopard occupancy population size spatially explicit capture-recapture

Rattle-Type Silica Colloidal Particles Prepared by a Surface- Protected Etching Process

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Nano Research 2009年第7期2卷 583-591页

作者： Qiao Zhang jianping ge James Goebl Yongxing Hu Zhenda Lu Yadong Yin Department of Chemistry University of CaliforniaRiversideCalifornia 92521USA

This paper explores the capability of the“surface-protected etching”process for the creation of rattle-type SiO_(2)@void@SiO_(2) colloidal structures featuring a mesoporous silica shell and a mesoporous movable silica core.The surface-protected etching process involves stabilization of the particle surface using a polymer ligand,and then selective etching of the interior to form hollow structures.In this paper,this strategy has been extended to the formation of rattle-like structures by etching SiO_(2)@SiO_(2) core shell particles which are synthesized by a two-step sol gel process.The key is to introduce a protecting polymer of polyvinylpyrrolidone(PVP)to the surface of both core and shell in order to tailor their relative stability against chemical etching.Upon reacting with NaOH,the outer layer silica becomes a hollow shell as only the surface layer is protected by PVP and the interior is removed,while the core remains its original size thanks to the protection of PVP on its surface.This process can be carried out at room temperature without the need of additional templates or complicated heterogeneous coating procedures.The etching process also results in the rattle-type colloids having mesoscale pores with two distinct average sizes.In our demonstration of a model drug delivery process,such mesoporous structures show an interesting two-step elution profile which is believed to be related to the unique porous rattle structures.

关键词： Silica mesoporous core-shell structure surface-protected etching drug delivery

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我国镨循环利用供给的量化及提升策略研究

中国工程科学 2024年第3期26卷 108-119页

作者：葛建平姚钰洁王艺博中国地质大学(北京)经济管理学院北京100083 中国地质大学(北京)自然资源战略发展研究院北京100083

镨是支持全球清洁能源发展的关键矿产,全球对镨的需求持续增加。我国是全球镨储量和产量最大的国家,但是未来依然可能出现镨供给缺口,发展循环经济、促进物质循环利用是解决镨潜在供需受限问题的重要方案。本文采用动态物质流方法,结合... 详细信息

镨是支持全球清洁能源发展的关键矿产,全球对镨的需求持续增加。我国是全球镨储量和产量最大的国家,但是未来依然可能出现镨供给缺口,发展循环经济、促进物质循环利用是解决镨潜在供需受限问题的重要方案。本文采用动态物质流方法,结合循环利用率指标,估算了2011—2020年我国内地地区的镨循环利用潜力。结果表明:2011—2020年,我国累计有7.902×10^(4)t镨进入镨循环,其中1.639×10^(4)t来自循环利用;从钕铁硼磁体生产废料中累计回收利用了1.369×10^(4)t镨,其循环利用率稳定在17%左右;理论上,报废产品可以供给2.7×10^(3)t镨,其循环利用率从0.04%增长到5.17%。针对实现报废产品中镨循环利用所面临的主要挑战,本文提出了完善我国生产者责任延伸制、逐步建立相关产品的消费者责任制、引导行业制定循环利用相关技术规范和行业标准等镨循环利用提升策略。

关键词：镨循环物质流分析循环利用率