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Fe(Ⅱ)-mediated transformation of schwertmannite associated with calcium from acid mine drainage treatment

Journal of Environmental Sciences 2023年第4期126卷 612-620页

作者： Cong Fan Chuling Guo Wei Chen Guining Lu Yu Shen Zhi Dang National Research Base of Intelligent Manufacturing Service Chongqing Technology and Business UniversityChongqing 400067China School of Environment and energy South China University of TechnologyGuangzhou 510006China The key laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of EducationSouth China University of TechnologyGuangzhou 510006China Chongqing key laboratory of Environmental materials and Remediation technologies Chongqing University of Arts and SciencesChongqing 402160China

Schwertmannite is an important Fe(Ⅲ)-oxyhydroxysulfate in acid mine drainage (AMD) polluted areas and its stability depends on surrounding environmental factors and previously bound *** treatment and neutralization of AMD normally involve the use of lime,which leads to the discharge of abundant Ca in the mining *** an environmental disturbance brings up an important and less considered problem of how the reductive transformation of schwertmannite associated with coexisting Ca ***,the Fe(Ⅱ)-mediated transformation of Ca-adsorbed schwertmannite and subsequent Ca repartitioning behaviors were *** showed that adsorbed Ca had a weak inhibitory effect on Fe(Ⅱ)-mediated schwertmannite *** of SO_(4)2-and SEM images both indicated that transformation rates of schwertmannite decreased under the influence of adsorbed *** patterns indicated that adsorbed Ca altered schwertmannite transformation pathways and product compositions upon treatment with 0.4 mmol/L Fe(Ⅱ).The end products of Sch notably contained both goethite and lepidocrocite;however,transformation products of SchCa only contained goethite all *** 33.5%of the surface adsorbed-Ca was released into solution within 6 hr after Fe(Ⅱ) *** Ca behaved in a“first release and then im-mobilization”manner,which indicated dissolution and secondary mineralization drove Ca migration during the Fe(Ⅱ)-mediated transformation of *** Ca blocked the surface sites for subsequent Fe(Ⅱ) adsorption,limited the Fe(Ⅱ)-Fe(Ⅲ) ETAE,and decreased the transformation *** work sheds light on the complex geochemical behavior of schwertmannite under the influences of environmental perturbations in AMD environments.

关键词： Acid mine drainage Schwertmannite Calcium Fe(II) Transformation

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Modification of Ti_(3)C_(2) MXene nanosheets with tunable properties using a post-processing method

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Rare Metals 2022年第9期41卷 3100-3106页

作者： Zhi-Hong Chen Ze-Na Zhang Hai-Qi Zhang Die Hu Zhi-Bin Ye Yi Zhang Yi Yu Bao-Hua Nie Hong-Xia Xi Chong-Xiong Duan School of materials Science and Hydrogen Engineering Foshan UniversityFoshan528231China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640China Guangdong key laboratory for Hydrogen energy technologies Foshan UniversityFoshan528000China School of energy Sciences and Engineering Nanjing Tech UniversityNanjing211816China

MXenes are a family of two-dimensional(2D)transition metal carbides and nitrides with many intriguing properties and applications,many of which require surface ***,as-synthesized Ti_(3)C_(2) was modified using different treatments(acid and base treatments)and then characterized by a complementary combination of X-ray powder diffraction(XRD),scanning electron microscopy(SEM),Fourier-transform infrared spectroscopy(FTIR),nitrogen adsorption-desorption isotherms,and pore size distribution *** results indicated that the structure and surface properties of the obtained Ti_(3)C_(2) could be tuned using various *** modification methods developed in this study may offer a new direction for tuning the structure and surface properties of MXenes for a wide range of applications.

关键词： MXenes Surface modification Acid treatment Base treatment

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Highly efficient Cu_(2)ZnSn(S,Se)_(4) bifacial solar cell via a composition gradient strategy through the molecular ink

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Science China materials 2022年第3期65卷 612-619页

作者： Saqib Nawaz Khan Sijie Ge Yuxiang Huang Han Xu Wentao Yang Ruijiang Hong Yaohua Mai Ening Gu Xianzhong Lin Guowei Yang guangzhou key laboratory of Flexible Electronic materials and Wearable Devices State Key Laboratory of Optoelectronic Materials and TechnologiesSchool of Materials Science and EngineeringSun Yat-Sen UniversityGuangzhou 510275China key laboratory of Polymeric Composite and Functional materials of Ministry of Education Sun Yat-Sen UniversityGuangzhou 510275China School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Institute of new energy Technology College of Information and TechnologyJinan UniversityGuangzhou 510632China

The use of transparent conducting oxide(TCO)as a substrate in Cu_(2)ZnSn(S,Se)_(4)(CZTSSe)thin-film solar cells allows for advanced applications,such as bifacial,semitransparent,and tandem solar cells with the capability to increase power density ***,the efficiency of this kind of solar cell is still below 6% based on the low-cost solution *** this work,we develop a composition gradient strategy and demonstrate a 6.82% efficient CZTSSe solar cell on F:SnO_(2)(FTO)substrate under the ambient *** composition gradient is realized by simply depositing the precursor inks with different Zn/Sn *** verify that the high performance of the solar cell is attributed to the composition gradient strategy rather than the sole change of the Zn/Sn ratio,devices based on absorbers with varied Zn/Sn ratios are ***,the structure and surface morphology of the CZTSSe films with/without composition gradients are *** presence of elemental gradient through the depth of the CZTSSe films before and after annealing is confirmed by secondary ion mass spectroscopy *** is found that the composition gradient enhances the crystallinity of the absorber,reduces the surface roughness as well as device parasitic losses,contributing to a higher fill factor,open-circuit voltage,and conversion efficiency.

关键词： Cu_(2)ZnSn(S,Se)_(4) composition gradient bifacial solar cell molecular ink

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Intrinsically scale-free ferroelectricity in two-dimensional M_(2)X_(2)Y_(6)

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Nano Research 2022年第4期15卷 3704-3710页

作者： Xin Jin Lei Tao Yu-Yang Zhang Jinbo Pan Shixuan Du Institute of Physics&University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Songshan Lake materials laboratory Dongguan 523808China CAS key laboratory of vacuum Physics Beijing 100049China

Discovery of novel two-dimensional(2D)ferroelectric materials and understanding the mechanism are of vital importance for the design of nanoscale ferroelectric ***,we report the distinct geometric evolution mechanism of the newly reported M_(2)Ge_(2)Y_(6)monolayers and find out a large group of 2D ferroelectric candidates based on this *** origination of the ferroelectricity of M_(2)Ge_(2)Y_(6)is the vertical displacement of Ge-dimer in the same direction driven by a soft phonon mode of the centrosymmetric ***,we find another centrosymmetric configuration which is dynamically stable but higher in energy comparing with the ferroelectric *** metastable centrosymmetric phase of M_(2)Ge_(2)Y_(6)monolayers allows a new two-step ferroelectric switching path and may induce novel domain ***,the ferroelectric M_(2)Ge_(2)Y_(6)monolayers exhibit independently switchable dipoles and maintain their ferroelectricity after contacting with graphene electrodes,indicating their high application potentials in high-density ***,16 ferroelectric(FE)M_(2)Ge_(2)Y_(6)and 65 potential FE M2Sn2Y6 monolayers are identified through high-throughput *** findings provide a new strategy for future discovery of novel 2D ferroelectric materials and also platforms for experimental design of related functional devices.

关键词： two-dimensional(2D)materials mechanism of ferroelectricity scale-free ferroelectricity

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Au nanoclusters anchored on TiO_(2) nanosheets for high-efficiency electroreduction of nitrate to ammonia

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Nano Research 2024年第3期17卷 1209-1216页

作者： Miaosen Yang Tianran Wei Jia He Qian Liu Ligang Feng Hongyi Li Jun Luo Xijun Liu School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China Nanchang Institute of Technology Nanchang 330044China State key laboratory of Chemistry and Utilization of Carbon Based energy Resources College of ChemistryXinjiang UniversityUrumqi 830017China State key laboratory of Featured Metal materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China Institute for new energy materials and Low-Carbon technologies School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China Institute for Advanced Study Chengdu UniversityChengdu 610106China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China guangzhou Panyu Polytechnic Guangzhou 511483China ShenSi Lab Shenzhen Institute for Advanced StudyUniversity of Electronic Science and Technology of ChinaLonghua DistrictShenzhen 518110China

Electrocatalytic nitrate reduction reaction(NO_(3)RR)offers a unique rationale for green NH_(3) synthesis,yet the lack of high-efficiency NO_(3)RR catalysts remains a great *** this work,we show that Au nanoclusters anchored on TiO_(2) nanosheets can efficiently catalyze the conversion of NO_(3)RR-to-NH_(3) under ambient conditions,achieving a maximal Faradic efficiency of 91%,a peak yield rate of 1923μg·h^(-1)·mgcat.-1,and high durability over 10 consecutive cycles,all of which are comparable to the recently reported metrics(including transition metal and noble metal-based catalysts)and exceed those of pristine TiO_(2).Moreover,a galvanic Zn-nitrate battery using the catalyst as the cathode was proposed,which shows a power density of 3.62 mW·cm^(-2) and a yield rate of 452μg·h^(-1)·mgcat.-*** simulations further indicate that the atomically dispersed Au clusters can promote the adsorption and activation of NO_(3)-species,and reduce the NO_(3)RR-to-NH_(3) barrier,thus leading to an accelerated cathodic *** work highlights the importance of metal clusters for the NH_(3) electrosynthesis and nitrate removal.

关键词： NH3 electrosynthesis Zn-nitrate battery Au nanoclusters nitrate reduction reaction(NRR) TiO_(2)nanosheets

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Lattice Doping of Lanthanide Ions in Cs_(2)AgInCl_(6)Nanocrystals Enabling Tunable Photoluminescence

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energy Material Advances 2021年第1期2021卷 209-217页

作者： Ying Liu Maxim SMolokeev Zhiguo Xia The Beijing Municipal key laboratory of new energy materials and technologies School of Materials Science and EngineeringUniversity of Science and TechnologyBeijingChina laboratory of Crystal Physics Kirensky Institute of PhysicsFederal Research Center KSC SB RASsRussia Department of Engineering Physics and Radioelectronics Siberian Federal UniversityRussia Department of Physics Far Eastern State Transport UniversityRussia The State key laboratory of Luminescent materials and Devices Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied TechniquesSchool of Materials Science and EngineeringSouth China University of TechnologyChina

Lead-free halide double perovskite Cs_(2)AgInCl_(6 )has become the research hotspot in the optoelectronic *** is a challenge to utilize the lattice doping by different lanthanide ions with rich and unique photoluminescence(PL)emissions for emerging photonic ***,we successfully incorporated Dy^(3+),Sm^(3+),and Tb3+ions into Cs_(2)AgInCl_(6) nanocrystals(NCs)by the hot-injection method,bringing diverse PL emissions of yellowish,orange,and green light in Cs_(2)AgInCl_(6):Ln^(3+)(Ln^(3+)=Dy^(3+),Sm^(3+),Tb^(3+)).Moreover,benefiting from the energy transfer process,Sm^(3+)and Tb^(3+)ion-codoped Cs_(2)AgInCl_(6) NCs achieved tunable emission from green to yellow orange and a fluorescent pattern from the as-prepared NC-hexane inks by spray coating was made to show its potential application in fluorescent signs and anticounterfeiting *** work indicates that lanthanide ions could endow Cs_(2)AgInCl_(6) NCs the unique and tunable PL properties and stimulate the development of lead-free halide perovskite materials for new optoelectronic applications.

关键词： lanthanide orange perovskite

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Achieving white-light emission in a single-component polymer with halogen-assisted interaction

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Science China Chemistry 2021年第3期64卷 467-477页

作者： Zhuxin Zhou Zhu Mao Zhan Yang Tingting Yang Longji Zhu Yubo Long Zhenguo Chi Siwei Liu Matthew P.Aldred Xudong Chen Jiarui Xu Yi Zhang key laboratory for Polymeric Composite&Functional materials of Ministry of Education Key L aboratory for High-Performance Polymer Composites of Guangdong ProvinceGuangdong Engineering Technology Research Centre for High-performance Organic and Polymer Photoelectric Functional FilmsState Key Laboratory of Optoelectronic Materials and TechnologiesSchool of ChemistrySun Yat-sen UniversityGuangzhou 510275China Lomox Limited Bank HouseMarket SquareCongletonCheshire CW121ETUnited Kingdom Shenzhen Yanyi new materials Co. Ltd.Shenzhen 518110China

White-light emitting(WLE) polymers have attracted continuous attention for their promising applications in solid-state lighting,flexible display and related fields. However, achieving dual-emission and pure white-light emission in a single-component polymer is still challenging. In this study, a brominated single-component polymer Br OD-TFB was designed and synthesized,which shows dual-emission and white light emission properties in solution and room-temperature phosphorescence(RTP) in thin films. The dual-emission properties can be tuned by concentration, solvent polarity, and excitation energy. Spectral analyses and theoretical calculations reveal that the origin of the high-energy emission band(HEB) is intramolecular charge transfer(ICT)along the polymer chain, whilst the low-energy emission band(LEB) originates from the excited-state related to the intra-chain and inter-chain C–Br···π interactions as demonstrated by the single-crystal structure of the model compound. Appropriate control of the formation and the destruction of the halogen-assisted interactions can initiate white-light emission in the singlecomponent polymer. More interestingly, by dispersing Br OD-TFB(0.1 wt%) in a non-emissive, colorless and transparent polymer, the characteristics of this white-light emission can be fully demonstrated while exhibiting unexpected RTP properties,with photoluminescence quantum efficiency(Φ_(PL)) of up to 23% and CIE coordinates of(0.32, 0.32).

关键词： white-light emission single-component polymer halogen-assisted interaction functional polyimide mechanism

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Silica shell-assisted synthetic route for mono-disperse persistent nanophosphors with enhanced in vivo recharged near-infrared persistent luminescence

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Nano Research 2017年第6期10卷 2070-2082页

作者： Rui Zou Junjian Huang Junpeng Shi Lin Huang Xuejie Zhang Ka-Leung Wong Hongwu Zhang Dayong Jin Jing Wang Qiang Su Ministry of Education key laboratory of Bioinorganic and Synthetic Chemistry State Key Laboratory of Optoelectronic Materials and Technologies KL GHEI of Environment and Energy Chemistry School of Chemistry Sun Yat-Sen University Guangzhou 510275 China key Lab of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China Department of Chemistry Hong Kong Baptist University Hong Kong 999077 China Institute for Biomedical materials and Devices (IBMD) Faculty of Science University of Technology Sydney NSW 2007 Australia

Near-infrared （NIR） persistent-luminescence nanoparticles have emerged as a new class of background-free contrast agents that are promising for in vivo imaging. The next key roadblock is to establish a robust and controllable method for synthesizing monodisperse nanoparticles with high luminescence brightness and long persistent duration. Herein, we report a synthesis strategy involving the coating/etching of the SiO2 shell to obtain a new class of small NIR highly persistent luminescent ZnGa2O4：Cr^3＋,Sn^4＋（ZGOCS） nanoparticles. The optimized ZGOCS nanoparticles have an excellent size distribution of -15 nm without any agglomeration and an NIR persistent luminescence that is enhanced by a factor of 13.5, owing to the key role of the SiO2 shell in preventing nanoparticle agglomeration after annealing. The ZGOCS nanoparticles have a signal-to-noise ratio -3 times higher than that of previously reported ZnGa204：Cr^3＋（ZGC-1） nanoparticles as an NIR persistent-luminescence probe for in vivo bioimaging. Moreover, the persistent-luminescence signal from the ZGOCS nanoparticles can be repeatedly re-charged in situ with external excitation by a white light- emitting diode; thus, the nanopartides are suitable for long-term in vivo imaging applications. Our study suggests an improved strategy for fabricating novel high-performance optical nanoparticles with good biocompatibility.

关键词： core-shell structure in vivo imaging narrow size distribution near-infrared (NIR)persistent luminescence biocompatibility

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Te-mediated electro-driven oxygen evolution reaction

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Nano Research energy 2022年第3期1卷 52-65页

作者： Feng Gao Jiaqing He Haowei Wang Jiahui Lin Ruixin Chen Kai Yi Feng Huang Zhang Lin Mengye Wang State key laboratory of Optoelectronic materials and technologies School of MaterialsSun Yat-sen UniversityGuangzhou 510275China School of Environment and energy Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters(Ministry of Education)South China University of TechnologyGuangzhou 51006China School of Metallurgy and Environment Central South UniversityChangsha 410083China

In the 21^(st)century,the rapid development of human society has made people’s demand for green energy more and more *** high-energy-density hydrogen energy obtained by fully splitting water is not only environmentally friendly,but also is expected to solve the problems caused by the intermittent nature of new ***,the slow kinetics and large overpotential of the oxygen evolution reaction(OER)limit its *** introduction of Te element is expected to bring new *** the least electronegativity among the chalcogens,the Te element has many special properties,such as multivalent states,strong covalentity,and high electrical conductivity,which make it a promising candidate in electrocatalytic *** this review,we introduce the peculiarities of Te element,summarize Te doping and the extraordinary performance of its compounds in OER,with emphasis on the scientific mechanism behind Te element promoting the OER kinetic ***,challenges and development prospects of the applications of Te element in OER are presented.

关键词： oxygen evolution reaction telluride electrocatalyst water splitting chalcogen

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Advances in MXene Films:Synthesis,Assembly,and Applications

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Transactions of Tianjin University 2021年第3期27卷 217-247页

作者： Xiaohua Li Feitian Ran Fan Yang Jun Long Lu Shao MIIT key laboratory of Critical materials Technology for new energy Conversion and Storage State Key Laboratory of Urban Water Resource and Environment(SKLUWRE)School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150000China

A growing family of two-dimensional(2D)transition metal carbides or nitrides,known as MXenes,have received increasing attention because of their unique properties,such as metallic conductivity and good *** studies on MXenes have been widely pursued,given the composition diversity of the parent MAX *** review focuses on MXene fi lms,an important form of MXene-based materials for practical *** summarized the synthesis methods of MXenes,focusing on emerging synthesis strategies and reaction *** advanced assembly technologies of MXene fi lms,including vacuum-assisted fi ltration,spin-coating methods,and several other approaches,were then ***,recent progress in the applications of MXene fi lms in electrochemical energy storage,membrane separation,electromagnetic shielding fi elds,and burgeoning areas,as well as the correlation between compositions,architecture,and performance,was discussed.

关键词： MXene fi lms Synthesis Assembly Mechanism Applications

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