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Template-free synthesis of core-shell Fe_(3)O_(4)@mos_(2)@mesoporous TiO_(2) magnetic photocatalyst for wastewater treatment

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 177-191页

作者： Jingshu Yuan Yao Zhang Xiaoyan Zhang Liang Zhao Hanlin Shen Shengen Zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Xi’an Fanyi University Xi’an 710105China Civil and Environmental Engineering Michigan State UniversityEast LansingMI 48824USA

TiO_(2)is the dominant and most widely researched photocatalyst for environmental remediation,however,the drawbacks,such as only responding to UV light(<5%of sunlight),low charge separation efficiency,and difficulties... 详细信息

TiO_(2)is the dominant and most widely researched photocatalyst for environmental remediation,however,the drawbacks,such as only responding to UV light(mos_(2)@mesoporous TiO_(2)(FMmT)photocatalysts via a simple,green,and template-free solvothermal method combined with ultrasonic hydrolysis.It is found that FMmT possesses a high specific surface area(55.09 m2·g−1),enhanced visible-light responsiveness(~521 nm),and remarkable photogenerated charge separation efficiency.In addition,the photocatalytic degradation efficiencies of FMmT for methylene blue(MB),rhodamine B(RhB),and tetracycline(TC)are 99.4%,98.5%,and 89.3%within 300 min,respectively.The corresponding degradation rates are 4.5,4.3,and 3.1 times higher than those of pure TiO_(2)separately.Owing to the high saturation magnetization(43.1 A·m^(2)·kg^(−1)),FMmT can achieve effective recycling with an applied magnetic field.The improved photocatalytic activity is closely related to the effective transport of photogenerated electrons by the active interlayer mos_(2) and the electron–hole separation caused by the mos_(2)@TiO_(2)heterojunction.Meanwhile,the excellent light-harvesting ability and abundant reactive sites of the mesoporous TiO_(2)shell further boost the photocatalytic efficiency of FMmT.This work provides a new approach and some experimental basis for the design and performance improvement of magnetic photocatalysts by innovatively incorporating MoS2 as the active interlayer and integrating it with a mesoporous shell.

关键词： core-shell MoS2 mesoporous TiO2 photocatalytic degradation heterojunction magnetic recycling

MoS2对热压Fe基金刚石钻头胎体性能的影响研究

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煤田地质与勘探 2023年第4期51卷 170-178页

作者：章文姣谭松成潘秉锁金鑫孔祥清龙尚琳辽宁工业大学土木建筑工程学院辽宁锦州121001 中国地质大学(武汉)工程学院湖北武汉430074 中煤科工西安研究院(集团)有限公司陕西西安710077

金刚石钻头是勘探工作中的常见破岩工具,但金刚石热稳定性较差,在钻进过程中会不断产生热量,干旱缺水条件下钻头自冷却对钻进效率的提高具有非常重要的意义。为降低干钻条件下钻头胎体与岩石界面间的摩擦因数从而减少钻进过程中金刚石... 详细信息

金刚石钻头是勘探工作中的常见破岩工具,但金刚石热稳定性较差,在钻进过程中会不断产生热量,干旱缺水条件下钻头自冷却对钻进效率的提高具有非常重要的意义。为降低干钻条件下钻头胎体与岩石界面间的摩擦因数从而减少钻进过程中金刚石的热损伤,在热压Fe基金刚石钻头胎体中添加二硫化钼(MoS2),研究MoS2含量对Fe基钻头胎体相对密度、洛氏硬度、抗弯强度以及与白刚玉砂轮干磨时的磨损量和摩擦因数的影响,并用扫描电子显微镜(SEM)和能谱仪(EDS)等测试仪器分析了抗弯强度和摩擦磨损试验后的试样断口和表面的形貌及物相成分。试验结果表明,在试验范围内,Fe基胎体相对密度与MoS2含量关系不大,但是与未添加MoS2的Fe基胎体相比,其相对密度提高了约2.5%,达98%以上。Fe基胎体洛氏硬度随着MoS2含量的增加先增大后减小,在MoS2体积分数为8%时胎体硬度最大,洛氏硬度HRB值达101.3。Fe基胎体抗弯强度随着MoS2含量的增加先增大后减小,在MoS2体积分数为2%时胎体抗弯强度最大,达1140 MPa。Fe基胎体磨损量随着MoS2含量的增加先减小后增大,在MoS2体积分数为4%时磨损量最小,为0.376 g。Fe基胎体与岩石界面间的摩擦因数则随着MoS2含量的增加而逐渐下降,在MoS2体积分数为10%时摩擦因数最小,为0.325。抗弯强度断裂试样断口形貌和物相分析表明,MoS2的加入降低了Fe基胎体显微组织的连续性。摩擦磨损试验后试样形貌分析表明,MoS2的加入降低了摩擦磨损过程中的粘着磨损和塑性变形。研究成果为减少干钻条件下金刚石磨损和热损伤,提高胎体耐磨性,延长钻头寿命奠定了理论基础。

关键词： MoS2 金刚石钻头热压Fe基胎体机械性能摩擦学性能

3D flower-like mesoporous Bi_(4)O_(5)I_(2)/mos_(2)Z-scheme heterojunction with optimized photothermal-photocatalytic performance

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Green Energy & Environment 2023年第1期8卷 200-212页

作者： Sijia Song Zipeng Xing Ke Wang Huanan Zhao Peng Chen Zhenzi Li Wei Zhou Department of Environmental Science School of Chemistry and Materials ScienceKey Laboratory of Functional Inorganic Material ChemistryMinistry of Education of the People's Republic of ChinaHeilongjiang UniversityHarbin150080China Shandong Provincial Key Laboratory of Molecular Engineering School of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)JinanShandong250353China

3D flower-like hierarchical mesoporous Bi_(4)O_(5)I_(2)/mos_(2)Z-scheme layered heterojunction photocatalyst was fabricated by oil bath and hydrothermal methods.The heterojunction with narrow band gap of~1.95 eV extended the photoresponse to near-infrared region,which showed obvious photothermal effect due to the introduction of mos_(2) with broad spectrum response.mos_(2) nanosheets were anchored onto the surface of flower-like hierarchical mesoporous Bi_(4)O_(5)I_(2) nanosheets,thereby forming efficient layered heterojunctions,the solar-driven photocatalytic efficiency in degradation of highly toxic dichlorophenol and reduction of hexavalent chromium was improved to 98.5%and 99.2%,which was~4 and 7 times higher than that of the pristine Bi_(4)O_(5)I_(2),respectively.In addition,the photocatalytic hydrogen production rate reached 496.78 μmol h^(-1)g^(-1),which was~6 times higher than that of the pristine Bi_(4)O_(5)I_(2).The excellent photocatalytic performance can be ascribed to the promoted photothermal effect,as well as,the formation of compact Z-scheme layered heterojunctions.The 3D flower-like hierarchical mesoporous structure provided adequate surface active-sites,which was conducive to the mass transfer.Moreover,the high stability of the prepared photocatalyst further promoted its potential practical application.This strategy also provides new insights for fabricating layered Zscheme heterojunctions photocatalysts with highly photothermal-photocatalytic efficiency.

关键词： Photocatalysis Z-scheme heterojunction Bi4O5I2 MoS2 Photothermal effect

MoS2-intercalated carbon hetero-layers bonded on graphene as electrode materials for enhanced sodium/potassium ion storage

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Nano Research 2023年第1期16卷 473-480页

作者： Laiying Jing Junwei Sun Chaoyang Sun Di Wu Gang Lian Deliang Cui Qilong Wang Haohai Yu State Key Lab of Crystal Materials Shandong UniversityJinan 250100China School of Materials Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China Key Laboratory for Special Functional Aggregated Materials of Education Ministry School of Chemistry&Chemical EngineeringShandong UniversityJinan 250100China

MoS2 is considered as an ideal electrode material in the field of energy storage due to high theoretical specific capacity and unique layered structure.However,limited interlayer distance and poor intrinsic electrical conductivity restrict its potential realworld application.Herein,an alternately intercalated structure of MoS2 monolayer and N-doped porous carbon(NC)layer is grown on reduced graphene oxide(rGO)via a chemical intercalated strategy.The expanded interlayer distance of MoS2(0.96 nm),enlarged by the intercalation of N-doped porous carbon layers,can enhance ion diffusion mobility,provide additional reactive sites for ion storage and maintain the stability of electrode structure.In addition,the hierarchical structures between rGO substrate and intercalated N-doped carbon layers construct a three-dimensional(3D)conductive network,which can significantly improve the electrical conductivity and the structural stability.As a result,the rGO-supported MoS2/NC electrode exhibits an ultrahigh reversible capacity and remarkable long cycling stability for sodium-ion batteries(SIBs)and potassium-ion(PIBs).Meanwhile,the as-obtained MoS2/NC@rGO electrode also delivers a superior cycle performance of 250 mAh·g−1 after 160 cycles at 0.5 A·g−1 when employed as an anode for sodium-ion full cells.

关键词： MoS2 graphene expanded interlayer spacing sodium-ion batteries potassium-ion batteries

Photodeposition of CoOx and MoS2 on CdS as dual cocatalysts for photocatalytic H2 production

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Journal of Materials Science & Technology 2022年第29期124卷 209-216页

作者： Tingmin Di Quanrong Deng Geming Wang Shenggao Wang Linxi Wang Yuhua Ma Hubei Key Laboratory of Plasma Chemistry and Advanced Materials School of Materials Science and EngineeringWuhan Institute of TechnologyWuhan 430205China Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074China College of Chemistry and Chemical Engineering Xinjiang Normal UniversityUrumqi 830054China

Photocatalytic Hproduction from water splitting has a promising prospect for alleviating energy and environmental issues.However,the fast recombination of photogenerated charge carriers limits the photocatalytic efficiency and its practical application.Cocatalyst engineering is an effective strategy to spatially separate photogenerated charge carriers.In this work,noble-metal-free mosand CoOcocatalysts are loaded on CdS nanorods by a two-step photodeposition method.The mosfunctions as the reduction cocatalyst to trap electrons and Co Oas the oxidation cocatalyst to trap holes.Transmission electron microscopy(TEM),inductively coupled plasma(ICP),X-ray photoelectron spectroscopy(XPS)and MottSchottky results demonstrate the effectiveness of photodeposition for loading mosand CoOdual cocatalysts on CdS and their impact on the photochemical properties.The optimized CdS-mos-CoOcomposite exhibits a high photocatalytic H-production rate of 7.4 mmol g^(-1)h^(-1)and an apparent quantum efficiency(QE)of 7.6%at 420 nm.Further analysis on time-resolved photoluminescence(TRPL)indicates that the introduction of dual cocatalysts greatly prolongs the lifetime of photogenerated charge carriers and deceases the charge recombination rates,consequently leading to superior photocatalytic H-production performance.This work provides a facile and effective strategy for the construction of highly efficient dual-cocatalyst-modified CdS photocatalyst for high-performance photocatalytic Hproduction.

关键词： Photocatalytic H2 production CdS Dual cocatalysts MoS2 CoOx Photodeposition

Biaxial versus uniaxial strain tuning of single-layer MoS2

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Nano Materials Science 2022年第1期4卷 44-51页

作者： Felix Carrascoso Riccardo Frisenda Andres Castellanos-Gomez Materials Science Factory Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC)

Strain engineering has arisen as a powerful technique to tune the electronic and optical properties of two-dimensional semiconductors like molybdenum disulfide(mos). Although several theoretical works predicted that biaxial strain would be more effective than uniaxial strain to tune the band structure of mos, a direct experimental verification is still missing in the literature. Here we implemented a simple experimental setup that allows to apply biaxial strain through the bending of a cruciform polymer substrate. We used the setup to study the effect of biaxial strain on the differential reflectance spectra of 12 single-layer mosflakes finding a redshift of the excitonic features at a rate between-40 me V/% and-110 me V/% of biaxial tension. We also directly compare the effect of biaxial and uniaxial strain on the same single-layer mosfinding that the biaxial strain gauge factor is 2.3 times larger than the uniaxial strain one.

关键词： 2D materials MoS2 Strain engineering biaxial strain uniaxial strain reflectance spectra

不同载荷及转速条件下mos_(2)涂层的摩擦磨损性能研究

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核聚变与等离子体物理 2023年第1期43卷 99-104页

作者：董思成钟利但敏许泽金王新超周毅金凡亚核工业西南物理研究院成都610041

为获得二硫化钼(mos_(2))涂层在聚变堆部件表面使用条件下的摩擦磨损特性,采用单极性脉冲磁控溅射技术在铁铬镍基高温合金A286上制备了厚度为2μm的mos_(2)涂层,并针对mos_(2)涂层在不同载荷及转速条件下的摩擦学性能展开了研究。经验证... 详细信息

为获得二硫化钼(mos_(2))涂层在聚变堆部件表面使用条件下的摩擦磨损特性,采用单极性脉冲磁控溅射技术在铁铬镍基高温合金A286上制备了厚度为2μm的mos_(2)涂层,并针对mos_(2)涂层在不同载荷及转速条件下的摩擦学性能展开了研究。经验证,沉积的mos_(2)涂层结晶度较好,沿(002)面择优取向;随测试转速的增加,摩擦系数逐渐减小,在转速为50r⋅min^(-1)时,摩擦系数平均值为0.0722;在转速固定时,摩擦系数随测试载荷的增加先减小后增大,当载荷为7N时达到最小平均值0.0763。

关键词： MoS2 摩擦性能载荷转速

TC4合金表面微弧氧化原位生长自润滑MoS2/TiO2膜层研究

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稀有金属材料与工程 2020年第9期49卷 3195-3202页

作者：杨泽慧王楠陈永楠张龙陈宏郝健民赵永庆史晨星史文龙长安大学材料科学与工程学院陕西西安710064 西北有色金属研究院陕西西安710016

钛合金表面减摩涂层的设计和制备是提升钛合金构件耐磨性能、保障服役安全的重要技术之一。针对于目前钛合金减摩涂层中减摩剂分散不均匀,易于团聚导致膜基结合力差等问题,本研究采用一步微弧氧化技术在TC4合金表面原位生长纳米MoS2颗粒... 详细信息

钛合金表面减摩涂层的设计和制备是提升钛合金构件耐磨性能、保障服役安全的重要技术之一。针对于目前钛合金减摩涂层中减摩剂分散不均匀,易于团聚导致膜基结合力差等问题,本研究采用一步微弧氧化技术在TC4合金表面原位生长纳米MoS2颗粒,制备具有减磨作用的MoS2/TiO2复合陶瓷膜层;讨论了原位反应中硫源添加量对膜层微观结构及耐磨性能的影响。结果表明:以Na2S和Na2MoO4分别为硫源和钼源在TC4合金表面通过微弧氧化制备出了MoS2/TiO2复合陶瓷膜层;通过控制Na2S浓度可以原位生成具有小尺寸、均匀化分布的纳米MoS2颗粒,并实现对MoS2含量和形态的调控。随着Na2S浓度的增加,膜层结构逐渐致密化且表面粗糙度较低,当添加量到达60 g/L时,由于硫沉淀作用导致膜层开始疏松,粗糙度增加。由于膜层表面和内部均存在均匀化分布且具有自润滑作用的MoS2颗粒,所得膜层耐磨性较传统微弧氧化膜层或直接添加MoS2颗粒所得膜层分别提高了395.4%、129.4%;同时,膜基结合力较传统微弧氧化提高了87.1%,达到了723.8 N,说明了该技术在保证良好的自润滑效果同时改善了膜基结合力。该研究结果可以为钛合金耐磨涂层设计和制备提供新思路和研究方法。

关键词： TC4 微弧氧化 MoS2 原位合成摩擦磨损

MoS2/CoCrNi自润滑复合涂层及高温摩擦学性能

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稀有金属材料与工程 2020年第12期49卷 4280-4289页

作者：刘慧强崔功军师睿博李赛寇子明太原理工大学机械与运载工程学院山西太原030024 山西省矿山流体控制工程实验室山西太原030024 矿山流体控制国家地方联合工程实验室山西太原030024

采用热压烧结技术在GH4169镍合金表面制备了CoCrNi-(3.0%,5.0%,7.0%)MoS2(质量分数)3种钴基高温自润滑涂层,并优化了MoS2的含量。采用球-盘式高温摩擦试验机,与Si3N4球配副,系统研究了温度、速度与载荷对涂层高温(20~800℃)摩擦学性能... 详细信息

采用热压烧结技术在GH4169镍合金表面制备了CoCrNi-(3.0%,5.0%,7.0%)MoS2(质量分数)3种钴基高温自润滑涂层,并优化了MoS2的含量。采用球-盘式高温摩擦试验机,与Si3N4球配副,系统研究了温度、速度与载荷对涂层高温(20~800℃)摩擦学性能的影响。采用X射线衍射仪和扫描电镜等分析了涂层的物相成分和微观形貌。通过热冲击实验测试涂层的结合强度。结果表明:MoS2与金属元素反应生成了固体润滑相Mo2S3和CrxSy;涂层与基底具有良好的界面结构;涂层主要由γ(fcc)、ε(hcp)、CrxNiy和固体润滑相(Mo2S3、CrxSy)构成。低温条件下,随着MoS2含量的增加,涂层的摩擦系数逐渐降低;高温条件下,由于磨损表面形成了由铬酸盐、氧化物和硫化物组成的固体润滑膜,涂层具有了优异的高温减摩耐磨性能;宽温域内钴基涂层的磨损率保持在5.5×10^-5 mm^3·N^-1·m^-1以下,在20~600℃范围内其抗磨损性能比基底高4~17倍,5.0%的MoS2对钴基涂层的高温摩擦学性能优化效果最佳。

关键词：钴基涂层高温摩擦磨损 MoS2