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Preparation of TiO2/Bi2O3 Microfibers and Their Photocatalytic Activity 认领 引用 被引量：4
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作者 马占营 邓玲娟 +1 位作者 李小博 范广 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2014年第4期439-444,J0001,J0002,共6页
A series of TiO2/Bi2O3 heterojunction microfibers have been fabricated using cotton fibers as bio-templates, and characterized by XRD, SEM and UV-Vis techniques. Results reveal that Bi2O3 in the TiO2/Bi2O3 sample is a... A series of TiO2/Bi2O3 heterojunction microfibers have been fabricated using cotton fibers as bio-templates, and characterized by XRD, SEM and UV-Vis techniques. Results reveal that Bi2O3 in the TiO2/Bi2O3 sample is assigned to monoclinic and tetragonal mix-crystal phase. Fibers lengths can reach several micrometers and diameters range from 0.5 μm to 3 μm. Compared with pure TiO2 and Bi2O3, TiO2/Bi2O3 samples display better absorption in visible light region. Photocatalytic activity was evaluated by degradation of MB under visible light irradiation. TiO2/Bi2O3 microfibers exhibite much higher activity than pure TiO2 and Bi2O3, and 22.84%TiO2/Bi2O3 can achieve the decomposition of about 95%MB, which is attributed to synergistic effects of the strong visible-light absorption of TiO2/Bi2O3 microfibers and the heterojunction formed between TiO2 and Bi2O3. 展开更多
关键词 TiO2/Bi2O3 microfiber Visible light Heterojunction Photocatalysis
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Formulation,stability,and synergistic characteristics of diesel-inwater Pickering emulsions stabilized by titanium carbide(Ti3C2Tx)MXene and Tween 40 认领 引用
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作者 Nansee S.K.Abu Zaid Aaminah Johar +2 位作者 Mustafa S.Nasser Khaled A.Mahmoud Sagheer A.Onaizi 《Petroleum Science》 SCIE EI CAS CSCD 2026年第1期393-421,共29页
Enhanced oil recovery(EOR)operations increasingly depend on emulsion-based formulations that exhibit long-term stability under reservoir conditions while minimizing surfactant dosage.In this context,hybrid systems com... Enhanced oil recovery(EOR)operations increasingly depend on emulsion-based formulations that exhibit long-term stability under reservoir conditions while minimizing surfactant dosage.In this context,hybrid systems combining nanoparticles and surfactants offer a promising route to achieving both interfacial stability and formulation efficiency.Among potential nanoparticle candidates,Ti3C2TxMXene exhibits high surface area and interfacial activity.However,its application in diesel-in-water Pickering emulsions under EOR-relevant conditions has not been explored.Challenges such as high hydrophilicity and strong electrostatic repulsion have limited the use of unmodified MXene as a standalone stabilizer in colloidal systems.To address this limitation,diesel-in-water Pickering emulsions were formulated using DL-Ti3C2TxMXene combined with Tween 40(0.5 wt%)and antifoam(0.15 wt%),aiming to investigate their synergistic stabilization behavior across MXene concentrations ranging from 0.1 to 1.5 wt%.The MXene-only system exhibited complete and immediate phase separation,whereas the hybrid emulsions demonstrated markedly enhanced stability,with no phase separation observed at 0.1 and 0.5 wt%after 24 h.A concentration-dependent trend was evident.At lower MXene contents,interfacial adsorption improved,and droplet sizes remained small and uniform.At higher concentrations(≥1.0 wt%),aggregation increased,and demulsification became more pronounced.Interfacial tension decreased steadily with increasing MXene content,reaching 0.86 mN/m at1.5 wt%,while zeta potential remained strongly negative(-47.7 mV at 0.5 wt%),indicating sufficient electrostatic repulsion.Rheological analysis revealed a transition to shear-thinning behavior at higher MXene contents,confirming the formation of internal network structures.Compared to other reported systems based on silica(SiO2),zinc oxide(ZnO),or functionalized MXenes,the MXene-Tween 40formulation achieved superior short-and long-term emulsion stability without requiring surface modification or external stimuli.To the best of our knowledge,this is the first study to report the successful stabilization of diesel-in-water Pickering emulsions using unmodified Ti3C2TxMXene.These findings highlight the synergistic interaction between MXene and Tween 40 and present a robust,surfactant-lean formulation suitable for oilfield applications. 展开更多
关键词 Titanium carbide(Ti3C2Tx)MXene nanosheets Oil-in-water(O/W)Pickering emulsions Tween 40 chemical surfactant Pickering emulsion characteristics Emulsion stability Emulsion rheology
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High-efficiency Photocatalytic Performance of Bi/Bi2Fe4O9Nanocomposites Synthesized by Hydrothermal Method for Degradation of Bisphenol A 认领 引用
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作者 WANG Junjie LI Yijie +1 位作者 LI Xinyi GUO Dongyun 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第2期364-370,共7页
Bi/Bi2Fe4O9nanocomposites consisting of Bi2Fe4O9nanosheets decorated with Bi nanodots were synthesized by a hydrothermal method.The formation of Bi nanodots on the Bi2Fe4O9nanosheet surfaces... Bi/Bi2Fe4O9nanocomposites consisting of Bi2Fe4O9nanosheets decorated with Bi nanodots were synthesized by a hydrothermal method.The formation of Bi nanodots on the Bi2Fe4O9nanosheet surfaces was attributed to the reducibility of 2-methoxyethanol in the precursor solution.Comparative photocatalytic evaluation reveals that the Bi/Bi2Fe4O9nanocomposites significantly enhance the degradation efficiency(99.0%)of bisphenol A compared with Bi2Fe4O9nanosheets(64.2%)under 120 min simulated solar irradiation.This remarkable enhancement can be attributed to the established Bi/Bi2Fe4O9heterojunction structure,which effectively facilitates the separation of photogenerated electron-hole pairs and accelerates interfacial charge transfer between the metallic Bi nanodots and semiconductor Bi2Fe4O9nanosheets.The synergistic effects arising from this unique architecture ultimately lead to superior photocatalytic performance. 展开更多
关键词 Bi2Fe4O9 nanosheets Bi nanodots nanocomposite hydrothermal method photocatalytic performance
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V2O5/TiO2和Cs/Co3O4催化剂联合催化脱除NOx和N2O 认领 引用
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作者 苗静文 樊星 +1 位作者 刘若雯 张雅坤 《环境工程》 CAS CSCD 2026年第2期103-111,共9页
针对高效脱除硝酸生产尾气中NOx和N2O的需求,提出了先催化NOx还原后催化N2O分解的技术路线。分别考察了V2O5/TiO2和Co3O4基催化剂催化NOx还原和N2O分解的性能,在优选出2.0Cs/Co3O4催化剂的基础... 针对高效脱除硝酸生产尾气中NOx和N2O的需求,提出了先催化NOx还原后催化N2O分解的技术路线。分别考察了V2O5/TiO2和Co3O4基催化剂催化NOx还原和N2O分解的性能,在优选出2.0Cs/Co3O4催化剂的基础上,重点考察了在V2O5/TiO2催化剂之后串接2.0Cs/Co3O4催化剂的联合催化脱除NOx和N2O的性能,并采用N2吸脱附、XRD、XPS和O2-TPD等手段对催化剂理化特性进行表征。结果表明:V2O5/TiO2催化还原NOx时,进气中含2%H2O有利于拓宽活性温度窗口和提高N2选择性,以及抑制N2O形成。在Co3O4表面负载2.0%Cs显著提高了催化剂催化N2O分解性能,这可能与Cs的引入导致部分Co3+还原为Co2+以及催化剂表面形成了更多氧空位有关。高温(400℃)下通入2%H2O对2.0Cs/Co3O4催化N2O分解的抑制作用较弱,但同时通入2%H2O和50×10-6 NO显著抑制了2.0Cs/Co3O4催化剂的活性。采用先V2O5/TiO2后2.0Cs/Co3O4的两段式催化剂联合脱除NOx和N2O时,前端的V2O5/TiO2催化剂主要催化NOx的还原反应,N2O对脱硝过程的影响有限;在V2O5/TiO2催化剂高效脱除NOx(和NH3)的温度范围内,后端的2.0Cs/Co3O4催化剂可较为稳定地催化N2O分解;在温度400℃,进气中含2%H2O时,NOx和NH3转化率均接近100%,N2O转化率为61.3%。 展开更多
关键词 NOx还原 N2O分解 V2O5/TiO2 Cs/Co3O4 联合催化
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Manipulating bond polarity and multiscale defect architectures for high-performance near-room-temperature Mg3(Sb,Bi)2 认领 引用
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作者 Yanqi HUANG Zehao LIN +7 位作者 Minwen YANG Jiahao JIANG Junyu LIN Yukun MA Qing CAO Fuqiang TANG Hui ZHANG Jing SHUAI 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2026年第7期66-73,共8页
Developing high-performance near-room-temperature thermoelectric materials is crucial for solid-state cooling and low-grade waste heat recovery.While n-type Mg3(Sb,Bi)2has emerged as a promising candidate,its pe... Developing high-performance near-room-temperature thermoelectric materials is crucial for solid-state cooling and low-grade waste heat recovery.While n-type Mg3(Sb,Bi)2has emerged as a promising candidate,its performance is fundamentally bottlenecked by the strong coupling of charge and heat transport,particularly the restricted carrier mobility originating from highly localized polar covalent bonds.Herein,we propose a synergistic strategy that manipulates chemical bond polarity and constructs multiscale defect architectures via Ni doping to decouple electron and phonon transport.First-principles calculations and structural analyses reveal that substituting Mg with the more electronegative Ni significantly reduces the cation-anion electronegativity difference.This effectively weakens the polarity of the Mg-(Sb,Bi)bonds and drives an antibonding-state-induced electron delocalization,yielding a remarkable~49.5%enhancement in room-temperature carrier mobility(up to 265.69 cm2V-1s-1).Concurrently,exceeding the solid solubility limit of Ni triggers the spontaneous formation of Ni-rich nanoprecipitates.These precipitates,coupled with point defects and local lattice distortions,establish a robust multiscale scattering network that effectively suppresses the lattice thermal conductivity to 0.74 W m-1K-1at 300 K.Consequently,the optimized Mg3.3Sb0.5Bi1.497Te0.003Ni0.01sample achieves an exceptional room-temperature power factor of~31.61μW cm-1K-2,culminating in a high room-temperature ZT of 0.84 and a peak ZT of 1.10 at 423 K.This work not only highlights the potential of n-type Mg3(Sb,Bi)2for near-room-temperature applications but also establishes a universal paradigm for optimizing polar thermoelectric semiconductors through electronegativity-driven bond engineering. 展开更多
关键词 Mg3(Sb,Bi)2 thermoelectric chemical bond engineering microstructural regulation
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等离子体协同S型Bi@Bi2S3/CeO2复合纤维可控合成及CO2光还原 认领 引用
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作者 曹铁平 李跃军 孙大伟 《硅酸盐学报》 EI CAS CSCD 北大核心 2026年第1期184-194,共11页
针对传统光催化剂载流子复合严重、CO2吸附活化不足的难题,通过静电纺丝-水热两步法合成了Bi@Bi2S3/CeO2复合纤维。扫描电子显微镜与透射电子显微镜揭示,Bi2S3以不同形貌构筑于CeO2纤维表面,原位生成的Bi纳米颗粒... 针对传统光催化剂载流子复合严重、CO2吸附活化不足的难题,通过静电纺丝-水热两步法合成了Bi@Bi2S3/CeO2复合纤维。扫描电子显微镜与透射电子显微镜揭示,Bi2S3以不同形貌构筑于CeO2纤维表面,原位生成的Bi纳米颗粒均匀锚定在Bi2S3表面,形成独特的三维立体结构。X射线光电子能谱与电子顺磁共振谱证实,Bi2S3与CeO2通过S型异质结实现载流子定向分离,高活性电子保留在Bi2S3导带用于CO2还原,强氧化空穴留存于CeO2价带驱动水氧化;Bi纳米颗粒的表面等离子体共振(SPR)效应使可见光吸收能力增强,同时可为体系分流更多高活性电子。在模拟太阳光照下,Bi@Bi2S3/CeO2复合纤维生成CO速率达14.58μmol·g-1·h-1(选择性72%),是纯CeO2纳米纤维的10倍,同时有部分CH4生成(5.68μmol·g-1·h-1)。5次循环后活性仍保持90%以上。通过分级结构设计,协同S型异质结与SPR效应,为解决CeO2基催化剂的性能瓶颈,实现CO2光还原提供了“结构-界面-组分”三重调控的新模式。 展开更多
关键词 表面等离子体共振 S型异质结 Bi@Bi2S3/CeO2复合纤维 可控合成
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Preparation of Ni/Ti3O5@graphene oxide double heterojunction for enhancing hydrogen storage in MgH2 认领 引用 被引量：1
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作者 Zexuan Yang Zhendong Ma +4 位作者 Yongjin Zou Cuili Xiang Lixian Sun Yongpeng Xia Yong Shen Chua 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期579-591,共13页
Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetic... Magnesium hydride serves as a promising solid-state hydrogen storage material owing to its high potential.However,its practical applications are constrained by the high enthalpy of hydrogen absorption and slow kinetics.In this study,we prepared a Ni/Ti3O5@graphene oxide(GO)dual-heterojunction composite material via solvent heating,electrostatic adsorption,and calcination to improve the hydrogen storage capabilities of MgH2.Adding Ni/Ti3O5@GO to MgH2 lowered the initial dehydrogenation temperature of MgH2 to 183℃;at a dehydrogenation temperature of 275℃,6.4 wt.%of H2 escaped from the MgH2 bulk.In addition,the hydrogen storage material absorbed 1.8 wt.%H2 at 30℃ for 30 min.The calculated activation energy of dehydrogenation was 48.221±0.141 kJ·mol-1,which was significantly lower than that of the ball-milled MgH2(112.63±1.44 kJ·mol-1).Mechanistic analysis results revealed that the heterojunction constructed from the multiphase compound system provided a large number of active sites and hydrogen diffusion routes,resulting in a synergistic catalytic effect that enhanced the hydrogen storage capacity of MgH2.In this work,we clarified the compositions of fuzzy interfaces in heterostructured materials by conducting ultraviolet photoelectron spectroscopy tests and identified key composite materials for the formation of heterojunctions. 展开更多
关键词 MGH2 Dual heterojunction Ni/Ti3O5@graphene oxide
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Bi/Bi2O2CO3等离子体复合材料的合成及其光催化性能 认领 引用
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作者 屈梦原 游康伟 +3 位作者 谢丽燕 王雅馨 罗志珊 黄建辉 《材料研究学报》 EI CAS CSCD 北大核心 2026年第5期343-351,共9页
以多聚甲醛作为碳源和还原剂,用一步水热法在Bi2O2CO3纳米片表面原位生长铋纳米颗粒(Bi NPs)构建Bi/Bi2O2CO3等离子体复合材料,使用XRD、SEM、TEM、XPS及UV-Vis DRS等手段表征其晶体结构、微观形貌、化学态和光学性能... 以多聚甲醛作为碳源和还原剂,用一步水热法在Bi2O2CO3纳米片表面原位生长铋纳米颗粒(Bi NPs)构建Bi/Bi2O2CO3等离子体复合材料,使用XRD、SEM、TEM、XPS及UV-Vis DRS等手段表征其晶体结构、微观形貌、化学态和光学性能,并以孔雀石绿(MG)和环丙沙星(CIP)为目标污染物评价其光催化活性。结果表明,铋纳米颗粒均匀分布在Bi2O2CO3表面,改变前驱体中铋与碳的摩尔比可精准调节其负载量。Bi与Bi2O2CO3质量比为1:10的复合材料其光催化性能最佳,反应速率分别比纯Bi2O2CO3和纯Bi粉末提高3.5倍和19.7倍。性能的提高可归因于金属Bi表面的等离子体共振(SPR)效应和Bi/Bi2O2CO3异质结的协同作用:一方面显著增强可见光吸收,另一方面促进光生载流子的分离和迁移,并抑制电子-空穴复合。ESR与活性物种捕获实验结果证实,超氧自由基和羟基自由基对MG和CIP的降解起了关键的作用。 展开更多
关键词 复合材料 光催化性能 水热法 Bi/Bi2O2CO3
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Extrinsic Er2O3-inspired H2O adsorption and dissociation on surface of industrial fly ash-derived SiO2 aerogel in electrocatalytic CO2 reduction 认领 引用
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作者 Lifeng Han Haorun Li +10 位作者 Kunming Hou Yan Guo Hao Wu Mengbo Zou Yulu Wang Zhihua Guo Huangdong Wang Guixiang Ma Shangpeng Liu Xiaojun Gu Shanghong Zeng 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期714-724,I0017,共11页
Industrial fly ash-derived SiO2aerogel with abundant mesopores has an excellent ability to support active ingredients for constructing efficient and stable catalyst in electrochemical CO2reduction reaction(CO_(2... Industrial fly ash-derived SiO2aerogel with abundant mesopores has an excellent ability to support active ingredients for constructing efficient and stable catalyst in electrochemical CO2reduction reaction(CO2RR).However,how to select and arrange active sites on its surface poses significant challenges due to its non-conductive nature.Here,we subtly designed and synthesized multi-component architectures to achieve the high efficiency of CO2RR to CO.The embedding of active and amorphous nitrogen-doped carbon(NC)nanosheets on the surface and inside of SiO2aerogel ensures the charge transport on the catalyst surface,and Er2O3improves dissociation of H2O,enabling the supply of protons for CO2RR.Simultaneously,Er2O3-induced defects/vacancies,nanoclusters coordinated with N on amorphous NC and single Ni in NC play crucial role in enhancing adsorption and activation of CO2.Consequently,the Ni-Er2O3/NC-SiO2catalyst exhibits the maintenance of FECOhigher than 95%over a wide potential window(-0.22 to-1.12 V vs.RHE)in a flow cell with gas-liquid-solid electrode.This work not only provides an atomistic understanding of nature of active sites in CO2RR but also contributes to the secondary utilization of industrial fly ash for a carbon-neutral future. 展开更多
关键词 Fly ash utilization SiO2aerogel Er2O3 H2O dissociation CO2electrochemical reduction
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Ionic potential mediated compositional-structural dual gradient engineering in P2/O3 cathodes for high-energy sodium storage 认领 引用
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作者 Zongyu Guan Meng Li +8 位作者 Ao Chen Jihuan Xie Aoci Yang Yang Gu Guoyao Pang Kuan Wang Weidong Zhuang Jiangtao Hu Biwei Xiao 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2026年第4期791-800,I0019,共10页
Sodium-ion batteries(SIBs)are regarded as a promising alternative to lithium-ion batteries for grid-scale energy storage owing to their low cost and sustainability;however,their competitiveness is still limited by rel... Sodium-ion batteries(SIBs)are regarded as a promising alternative to lithium-ion batteries for grid-scale energy storage owing to their low cost and sustainability;however,their competitiveness is still limited by relatively low energy density.Here,we report a scalable Mn-Fe-Ni layered oxide with a compositional-structural dual-gradient(DG)architecture synthesized via a three-step co-precipitation method.By exploiting the opposite roles of high-ionic-potential Mn and low-ionic-potential Fe in stabilizing the P2 and O3 frameworks,respectively,a pure compositional Mn/Fe gradient is translated into a structural P2/O3 gradient with precisely guided synthesis conditions.The Fe-deficient surface effectively suppressed Fe4+-induced side reactions,while the stable P2-type shell and the enlarged R value of the O3 core further enhanced cycling stability during structural evolution.The optimized cathode delivered an energy density of 478 Wh kg-1at 4.2 V,with 82%capacity retention after 200 cycles in half cells and 91%retention after 1600 cycles in full cells.This study demonstrates a viable pathway for developing high-energy-density and long-lifetime cathodes for sodium-ion batteries. 展开更多
关键词 Sodium-ion battery Cathode Double-gradient materials O3/P2 materials
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In2S3/HOF S-scheme heterojunction for enhanced photocatalytic H2O2 production 认领 引用
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作者 Yong Zhang Wenjun Zhu +1 位作者 Yanyan Zhao Shumin Zhang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第5期261-273,共13页
As an emerging crystalline porous material,hydrogen bonded organic frameworks(HOFs)have enormous potential in photocatalytic field.However,poor stability and rapid recombination of photogenerated charges hinder their ... As an emerging crystalline porous material,hydrogen bonded organic frameworks(HOFs)have enormous potential in photocatalytic field.However,poor stability and rapid recombination of photogenerated charges hinder their practical application in photocatalytic H2O2production.To address the above challenges,this work employs a wet chemical method to grow In2S3nanosheets in situ on the surface of highly stable HOF nanorods(PFC-1),resulting in a novel inorganic/organic In2S3/PFC-1(IP)S-scheme heterojunction.The optimal IP composite achieves a significantly improved photocatalytic H2O2evolution rate of 3.78 mmol g-1h-1,which is 2.9-and 3.7-fold than that of In2S3and PFC-1,respectively.The elevated visible-light absorption,abundant active sites,and effective charge separation of IP S-scheme heterojunction result in the improvement in photocatalytic performance.Additionally,photocatalytic H2O2production of IP goes through a two-electron O2 reduction reaction pathway.This work offers a novel strategy for the fabrication of efficient HOF-based S-scheme heterostructures and their application in photocatalytic field. 展开更多
关键词 Hydrogen-bonded organic frameworks In2S3 S-scheme photocatalyst O2 reduction Photocatalytic H2O2production
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Bi2O2CO3@Bi-MOF光催化剂的合成及光催化降解罗丹明B 认领 引用
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作者 何世健 胡思语 +2 位作者 邹慧欣 雷姣 张秋云 《辽宁化工》 CAS 2026年第3期385-388,共4页
采用一锅水热法将Bi2O2CO3负载到Bi-MOF得到Bi2O2CO3@Bi-MOF复合光催化剂,利用XRD、FTIR、SEM-EDS及UV-Vis DRS等技术对其结构、形貌、光学性能等进行分析,并在模拟可见光照射下,以罗丹明B(RhB)作为目标污染物,研究... 采用一锅水热法将Bi2O2CO3负载到Bi-MOF得到Bi2O2CO3@Bi-MOF复合光催化剂,利用XRD、FTIR、SEM-EDS及UV-Vis DRS等技术对其结构、形貌、光学性能等进行分析,并在模拟可见光照射下,以罗丹明B(RhB)作为目标污染物,研究其光催化性能。结果表明,可见光照射80 min后对50 mL、40 mg·L-1 RhB的降解率可达91.2%。 展开更多
关键词 Bi-MOF Bi2O2CO3 负载 光催化降解 RhB
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Bi/TiO2∶Sm3+复合纤维的制备及可见光催化降解抗生素洛美沙星 认领 引用
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作者 李跃军 曹铁平 孙大伟 《硅酸盐通报》 CAS 北大核心 2025年第5期1918-1926,共9页
以静电纺丝技术制备TiO2∶Sm3+纳米纤维,结合原位水热法,在葡萄糖酸钠作用下,合成Bi/TiO2∶Sm3+复合纤维。利用XRD和XPS表征样品的物相和组成,利用SEM和TEM观察样品的微观形貌,利用紫外-可见漫反射光谱和瞬态光电流等分析... 以静电纺丝技术制备TiO2∶Sm3+纳米纤维,结合原位水热法,在葡萄糖酸钠作用下,合成Bi/TiO2∶Sm3+复合纤维。利用XRD和XPS表征样品的物相和组成,利用SEM和TEM观察样品的微观形貌,利用紫外-可见漫反射光谱和瞬态光电流等分析样品的光电性能。结果表明,Sm3+进入TiO2晶格,占据Ti4+的位置,造成TiO2晶格膨胀,引起晶格畸变。稀土掺杂引入的晶格缺陷能够提高TiO2的费米能级,增加表面能量壁垒,使光生电子和空穴在表面的复合概率降低;金属Bi通过表面等离子体共振效应,结合稀土元素丰富的能级结构和4f电子跃迁特性,对TiO2进行双重修饰改性,进一步提高了TiO2的光催化活性和稳定性。可见光照5 h,Bi/TiO2∶Sm3+复合纤维对洛美沙星的降解效果最佳,达到97.37%,分别是Sm3+∶TiO2和Bi/TiO2的1.7和1.3倍。 展开更多
关键词 Bi/TiO2∶Sm3+复合纤维 洛美沙星 表面等离子体共振 稀土离子掺杂 可见光催化活性
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生物质炭基复合肥施用对砂质水稻土NH3挥发和N2O排放的影响 认领 引用 被引量：1
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作者 龚雪柳 覃景嵩 +7 位作者 吴佳蓉 赵近凯 冯彦房 卞荣军 郑聚锋 张旭辉 李恋卿 潘根兴 《农业资源与环境学报》 CAS CSCD 北大核心 2026年第2期366-376,共11页
为探究稻壳炭基复合肥替代市售复合肥对砂质稻田土壤氨(NH3)挥发、氧化亚氮(N2O)排放及水稻产量和氮肥农学效率的影响及其影响因素,本研究采用土柱试验法,设置CK(不施肥)、商品复合肥A(N-P2O5-K2O=15-10-10)、商品复合肥... 为探究稻壳炭基复合肥替代市售复合肥对砂质稻田土壤氨(NH3)挥发、氧化亚氮(N2O)排放及水稻产量和氮肥农学效率的影响及其影响因素,本研究采用土柱试验法,设置CK(不施肥)、商品复合肥A(N-P2O5-K2O=15-10-10)、商品复合肥B(N-P2O5-K2O=15-15-15)和炭基复合肥(N-P2O5-K2O=15-10-10,11%生物质炭)4个处理,通过连续气流法和静态暗箱法测定水稻主要施肥期土壤NH3挥发和N2O通量,分析等氮条件下炭基复合肥料施用对土壤NH3挥发、N2O排放和水稻产量的影响及其与关键环境因子之间的关系。结果表明,与复合肥A和复合肥B处理相比,炭基复合肥处理下土壤NH3挥发分别增加了55.72%和56.85%,而土壤N2O累积排放量分别降低了67.82%和58.03%。土壤NH3挥发与土壤pH值和脲酶活性呈显著相关(P<0.05),土壤N2O排放通量与土壤NH4+-N和NO3--N含量、土柱表面水pH值和NH4+-N含量及产量均呈极显著相关(P<0.01)。研究表明,不同施肥条件下土壤pH值和脲酶活性是影响NH3挥发的重要因子,而N2O排放则受土壤NH4+-N和NO3--N含量、土柱表面水pH值和NH4+-N含量的影响。炭基复合肥处理与常规复合肥处理对水稻产量和氮肥农学利用率的影响不显著。施用炭基复合肥替代常规市售复合肥料,在水稻稳产的同时显著降低土壤N2O排放,但增加了氨挥发排放的风险。 展开更多
关键词 炭基肥 氨挥发 氧化亚氮 肥料农学效率 水稻
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Enhanced photoelectrochemical performance of TiO2/Sb2S3 nanorod arrays by annealing in Ar ambience 认领 引用
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作者 SUI Meirong GU Xiuquan 《Optoelectronics Letters》 EI 2025年第7期385-390,共6页
In this work,the TiO2/Sb2S3 nanorod arrays(NRAs)were synthesized through a two-stage hydrothermal route for photoelectrochemical(PEC)water splitting.The effect of annealing treatment in Ar ambience on the PEC... In this work,the TiO2/Sb2S3 nanorod arrays(NRAs)were synthesized through a two-stage hydrothermal route for photoelectrochemical(PEC)water splitting.The effect of annealing treatment in Ar ambience on the PEC activity of TiO2/Sb2S3 composite sample was investigated by electrochemical impedance analysis,including Nyquist and Mott-Schottky(M-S)plots.It was demonstrated that vacuum annealing could crystallize Sb2S3 component and change its color from red to black,leading to an increment of photocurrent density from 1.9 A/m2 to 4.25 A/m2 at 0 V versus saturated calomel electrode(VSCE).The enhanced PEC performance was mainly attributed to the improved visible light absorption.Moreover,annealing treatment facilitated retarding the electron-hole recombination occurred at the solid/liquid interfaces.Our work might provide a novel strategy for enhancing the PEC performance of a semiconductor electrode. 展开更多
关键词 electrochemical impedance analysisincluding visible light absorption TiO2/Sb2S3nanorod arrays nanorod arrays nras vacuum annealing annealing treatment increment o photoelectrochemical performance
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LiCl-Li2O熔盐中U3O8的电化学还原及机理研究 认领 引用
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作者 程仲平 任健 +2 位作者 肖益群 贾艳虹 何辉 《核化学与放射化学》 CAS CSCD 北大核心 2026年第3期289-296,I0002,共8页
传统湿法后处理技术(如PUREX流程)存在废液生成量大、操作复杂等问题,而干法熔盐电解技术因其高效、废物量少等优势备受关注。通过干法熔盐电解技术将氧化物乏燃料转化为金属燃料是推动我国一体化快堆建设、实现闭式核燃料循环的关键环... 传统湿法后处理技术(如PUREX流程)存在废液生成量大、操作复杂等问题,而干法熔盐电解技术因其高效、废物量少等优势备受关注。通过干法熔盐电解技术将氧化物乏燃料转化为金属燃料是推动我国一体化快堆建设、实现闭式核燃料循环的关键环节。然而,我国在氧化物乏燃料电化学还原方面的研究报道较少,相关理论基础、实验方法及技术均相对薄弱。考虑到氧化物乏燃料中主要成分是UO2,在首端过程中UO2芯块通过氧化挥发技术转变为U3O8粉末。为此,本工作以U3O8固体粉末为对象,通过循环伏安法(CV)和恒电位电解实验,系统探究其在650℃的LiCl-Li2O熔盐中的电化学还原机理,并借助X射线衍射(XRD)、扫描电镜(SEM)及能谱分析(EDS)对电解产物的物相组成、微观形貌与元素分布进行表征。结果显示,电位扫描(1.50 V至0.00 V(vs.Li+/Li,下同))中观察到六个还原峰(c1—c6)及五个对应氧化峰(a1—a5),其中c1峰(0.00 V)为Li沉积,c2—c6峰(0.15-0.84 V)对应U3O8逐步还原为UO2和金属U的过程。恒电位电解实验显示在1.95 V下仅生成UO2相;1.20 V下产物为UO2与Li2UO4共存;而0.10~0.70 V未检测到金属U。这些结果表明U3O8电化学还原机理可能是:(1)与Li+发生氧化还原反应生成UO2和Li2UO4;(2)Li2UO4进一步还原为UO2;(3)UO2逐步电脱氧形成U。脉冲式恒电压电解产物经XRD与SEM/EDS分析证实其中存在金属U和UO2,说明U3O8固体粉末在LiCl-Li2O熔盐体系中可直接电化学还原为金属U。通过直接氧化法测定,U3O8的平均还原率为45.47%,平均电流效率为22.86%。本研究阐明了U3O8在熔盐体系中的多步还原机制,揭示了关键中间产物的转化规律,为优化氧化物乏燃料电化学还原工艺参数(如电位控制、熔盐组分设计)提供了理论依据,对实现金属燃料的高效制备及核能可持续发展具有重要意义。 展开更多
关键词 干法后处理 LiCl-Li2O熔盐 U3O8 电化学还原
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石墨烯对光固化Al2O3陶瓷力学性能的影响 认领 引用
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作者 刘耀 余庆轩 +3 位作者 王中原 文蓉江 李澜波 占丽娜 《热加工工艺》 CAS 北大核心 2026年第13期75-82,共8页
针对光固化Al2O3陶瓷在脱脂烧结后易形成孔洞、力学性能差的问题,系统研究了石墨烯添加对陶瓷浆料流变性、沉降性、固化行为及烧结体力学性能的影响。采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对Al2O3粉体进行表面改性,并加入不同含... 针对光固化Al2O3陶瓷在脱脂烧结后易形成孔洞、力学性能差的问题,系统研究了石墨烯添加对陶瓷浆料流变性、沉降性、固化行为及烧结体力学性能的影响。采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对Al2O3粉体进行表面改性,并加入不同含量的石墨烯,制备高固相、低粘度的光固化浆料。通过傅里叶红外光谱、旋转流变仪、沉降试验及Beer-Lambert模型分析,优化了浆料配方与光固化工艺参数。结果表明:当KH560含量为2.5wt%、石墨烯含量为0.01wt%时,浆料粘度最低、沉降分层最少;在曝光时间4 s条件下,添加0.01wt%石墨烯的浆料透射深度为382μm,临界曝光能量为44.3 m J/cm2。经1750℃烧结后,陶瓷零件致密度达99.7%,弯曲强度为27.61 MPa,维氏硬度为13.45GPa。石墨烯通过位阻效应及裂纹偏转机制有效促进了烧结致密化并改善了力学性能。本研究为光固化增材制造高致密、高性能氧化铝陶瓷提供了试验依据。 展开更多
关键词 石墨烯 光固化 Al2O3陶瓷 浆料 流变性能
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高熵P2/O3双相正极的协同设计助力高性能钠离子电池 认领 引用
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作者 赵珊 刘旭 +4 位作者 郭昊天 柳宗琳 王鹏飞 舒杰 伊廷锋 《物理化学学报》 SCIE CAS CSCD 北大核心 2026年第1期49-61,共13页
P2型层状过渡金属氧化物(P2-NaxTMO2)因其优异的循环稳定性和倍率性能,成为钠离子电池正极材料的有力候选者。然而,其在高电压下的不可逆相变和固有低理论容量问题,阻碍了实际应用。本研究工作提出高熵策略与双相结构的协同设计... P2型层状过渡金属氧化物(P2-NaxTMO2)因其优异的循环稳定性和倍率性能,成为钠离子电池正极材料的有力候选者。然而,其在高电压下的不可逆相变和固有低理论容量问题,阻碍了实际应用。本研究工作提出高熵策略与双相结构的协同设计来克服这些挑战。通过在P2相高熵基体中引入O3相,构建新型P2/O3双相高熵层状氧化物Na0.70Ni0.25Mn0.35Co0.15Fe0.05Ti0.20O2(简称Na0.70NMCFT)。其中,高熵设计通过构型熵稳定效应有效抑制P2相的不可逆相变,而O3相则通过协同作用弥补容量不足并提升循环稳定性。此外,双相组分之间的相互作用进一步促进P2-O3与P2-P3相变的高度可逆性。Na0.70NMCFT在1C倍率下的初始放电容量为102.08 mAhg-1,200次循环后容量保持率达88.15%,表明具有优异的循环稳定性。更重要的是,即使在10C的高倍率下,Na0.70NMCFT仍能提供85.67 mAh g-1的初始放电比容量,并在1000次循环后容量保持率达70%。本工作证实双相高熵设计在提升钠离子电池正极性能中的关键作用,为开发先进钠离子电池正极材料提供了新思路。 展开更多
关键词 钠离子电池 层状氧化物正极 高熵 P2/O3双相 相变
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釉中SiO2和Al2O3含量对青花瓷“晕散”的影响研究 认领 引用
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作者 李小龙 胡其国 +2 位作者 赵田贵 董伟霞 包启富 《中国陶瓷》 CAS CSCD 北大核心 2026年第7期79-88,共10页
青花瓷作为中国传统文化的瑰宝,在制备烧造过程中,因青花色料、釉料配方组成以及制备工艺的影响,易造成青花装饰出现发色不均匀、线条或者块面在不同朝代或者是同一朝代有不同程度的“晕散”。实验采用场发射扫描电镜(FE-SEM)、傅里叶光... 青花瓷作为中国传统文化的瑰宝,在制备烧造过程中,因青花色料、釉料配方组成以及制备工艺的影响,易造成青花装饰出现发色不均匀、线条或者块面在不同朝代或者是同一朝代有不同程度的“晕散”。实验采用场发射扫描电镜(FE-SEM)、傅里叶光谱(FTIR)、电子探针(EPMA)、光学显微镜(OM)等设备分析青花瓷釉中SiO2和Al2O3含量对青花装饰晕散距离、微观结构、釉层网络结构以及釉中Co2+浓度的影响,结合理论计算阐明了青花瓷“晕散”与釉料黏度之间的关系。实验结果表明,随着釉中SiO2和Al2O3含量的增加,釉层网络结构中Si—O—Si键数量增多并且增强,釉层黏度增大;黏流活化能拟合结果表明,黏流活化能增大,原子间作用力越强,Co2+在釉中扩散越困难,青花瓷线条的“晕散”距离从250μm减小到10μm。本研究有助于从物理化学角度理解青花“晕散”机制,为青花装饰工艺的优化提供科学依据。 展开更多
关键词 青花瓷 SiO2 Al 2O3 晕散 黏流活化能
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“O3/H2O2+两级A2/O+MBBR”深度处理南方某电镀工业园区混排废水 认领 引用
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作者 蔡升云 韩琦 《工业水处理》 CAS CSCD 北大核心 2026年第6期193-200,共8页
针对南方某电镀工业园区混排废水污染复杂的特点(高氮素、多金属、高毒性),采用“O3/H2O2+两级A2/O+MBBR”组合工艺进行深度处理,以满足各类污染物“高排放标准”要求和毒性控制效果。对为期18个月的整体运行数据进行分析,... 针对南方某电镀工业园区混排废水污染复杂的特点(高氮素、多金属、高毒性),采用“O3/H2O2+两级A2/O+MBBR”组合工艺进行深度处理,以满足各类污染物“高排放标准”要求和毒性控制效果。对为期18个月的整体运行数据进行分析,可知组合工艺对CODCr、氨氮、总氮、总磷的平均去除率分别为94.11%、99.29%、96.52%、98.79%,出水平均质量浓度分别为17.50、0.45、4.05、0.08 mg/L;对总镍、总铬、总铜、总锌、总铁的平均去除率均高于99%,出水平均质量浓度分别为0.048、0.004、0.016、0.010、0.015 mg/L,各出水水质稳定满足广东省《电镀水污染物排放标准》(DB 44/1597—2015)和《地表水环境质量标准》(GB 3838—2002)Ⅳ类标准中的较严排放限值要求,废水生物毒性得到有效控制。研究表明,该组合工艺通过强化预处理与生物脱氮除磷协同作用,可有效应对“高排放标准”背景下电镀废水深度处理问题,为同类废水处理提供技术参考。 展开更多
关键词 O3/H2O2 两级A2/O 移动床生物膜反应器(MBBR) 电镀混排废水 高排放标准
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