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Cu/TiO_(2) Photocatalysts for CO_(2) Reduction: Structure and Evolution of the Cocatalyst Active Form 被引量:2
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作者 Andrey A.Saraev Anna Yu.Kurenkova +3 位作者 Denis D.Mishchenko Alexandr L.Trigub Evgeniy Yu.Gerasimov Ekaterina A.Kozlova 《Transactions of Tianjin University》 EI CAS 2024年第2期140-151,共12页
Extensive work on a Cu-modified TiO_(2) photocatalyst for CO_(2) reduction under visible light irradiation was conducted. The structure of the copper cocatalyst was established using UV-vis diff use refl ectance spect... Extensive work on a Cu-modified TiO_(2) photocatalyst for CO_(2) reduction under visible light irradiation was conducted. The structure of the copper cocatalyst was established using UV-vis diff use refl ectance spectroscopy, high-resolution transmis- sion electron microscopy, X-ray absorption spectroscopy, and X-ray photoelectron spectroscopy. It was found that copper exists in different states (Cu 0 , Cu^(+) , and Cu^(2+) ), the content of which depends on the TiO_(2) calcination temperature and copper loading. The optimum composition of the cocatalyst has a photocatalyst based on TiO_(2) calcined at 700℃ and modified with 5 wt% copper, the activity of which is 22 μmol/(h·g cat ) (409 nm). Analysis of the photocatalysts after the photocatalytic reaction disclosed that the copper metal on the surface of the calcined TiO_(2) was gradually converted into Cu_(2) O during the photocatalytic reaction. Meanwhile, the metallic copper on the surface of the noncalcined TiO_(2) did not undergo any trans- formation during the reaction. 展开更多
关键词 PHOTOCATALYSIS Photocatalytic CO_(2)conversion Visible light Titanium dioxide Copper Copper oxides Methane formation photocatalyst transformation
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Mg-doped SrTaO_(2)N as a visible-light-driven H_(2)-evolution photocatalyst for accelerated Z-scheme overall water splitting
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作者 Jun Xu Ying Luo +4 位作者 Qiaoqi Guo Wenzheng Sun Shanshan Chen Zheng Wang Hong He 《Chinese Journal of Catalysis》 SCIE CAS CSCD 2024年第10期70-78,共9页
Perovskite SrTaO_(2)N is one of the most promising narrow-bandgap photocatalysts for Z-scheme overall water splitting.However,the formation of defect states during thermal nitridation severely hinders the separation o... Perovskite SrTaO_(2)N is one of the most promising narrow-bandgap photocatalysts for Z-scheme overall water splitting.However,the formation of defect states during thermal nitridation severely hinders the separation of charges,resulting in poor photocatalytic activity.In the present study,we successfully synthesize SrTaO_(2)N photocatalyst with low density of defect states,uniform morphology and particle size by flux-assisted one-pot nitridation combined with Mg doping.Some important parameters,such as the size of unit cell,the content of nitrogen,and microstructure,prove the successful doping of Mg.The defect-related carrier recombination has been significantly reduced by Mg doping,which effectively promotes the charge separation.Moreover,Mg doping induces a change of the band edge,which makes proton reduction have a stronger driving force.After modifying with the core/shell-structured Pt/Cr_(2)O_(3)cocatalyst,the H_(2)evolution activity of the optimized SrTaO_(2)N:Mg is 10 times that of the undoped SrTaO_(2)N,with an impressive apparent quantum yield of 1.51%at 420 nm.By coupling with Au-FeCoO_(x)modified BiVO_(4)as an O_(2)-evolution photocatalyst and[Fe(CN)_(6)]_(3)−/[Fe(CN)_(6)]_(4)−as the redox couple,a redox-based Z-scheme overall water splitting system is successfully constructed with an apparent quantum yield of 1.36%at 420 nm.This work provides an alternative way to prepare oxynitride semiconductors with reduced defects to promote the conversion of solar energy. 展开更多
关键词 Photocatalytic overall water splitting SrTaO_(2)N photocatalyst Mg doping Defect density COCATALYST
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TiO2-PES Fibrous Composite Material for Ammonia Removal Using UV-A Photocatalyst
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作者 Anh Phuong Le Thi Masaru Ohshiro Takaomi Kobayashi 《Journal of Materials Science and Chemical Engineering》 2024年第1期1-19,共19页
This study focused on the development and characterization of TiO<sub>2</sub>-PES composite fibers with varying TiO<sub>2</sub> loading amounts using a phase inversion process. The resulting co... This study focused on the development and characterization of TiO<sub>2</sub>-PES composite fibers with varying TiO<sub>2</sub> loading amounts using a phase inversion process. The resulting composite fibers exhibited a sponge-like structure with embedded TiO<sub>2</sub> nanoparticles within a polymer matrix. Their photocatalytic performance for ammonia removal from aqueous solutions under UV-A light exposure was thoroughly investigated. The findings revealed that PeTi8 composite fibers displayed superior adsorption capacity compared to other samples. Moreover, the study explored the impact of pH, light intensity, and catalyst dosage on the photocatalytic degradation of ammonia. Adsorption equilibrium isotherms closely followed the Langmuir model, with the results indicating a correlation between qm values of 2.49 mg/g and the porous structure of the adsorbents. The research underscored the efficacy of TiO<sub>2</sub> composite fibers in the photocatalytic removal of aqueous under  UV-A light. Notably, increasing the distance between the photocatalyst and the light source resulted in de-creased hydroxyl radical concentration, influencing photocatalytic efficiency. These findings contribute to our understanding of TiO<sub>2</sub> composite fibers as promising photocatalysts for ammonia removal in water treatment applications. 展开更多
关键词 Ammonia Removal photocatalyst TiO2-PES Composite Fiber Fibrous Material
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Semiconductor-based terahertz frequency combs
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作者 Hua Li 《Journal of Semiconductors》 EI CAS CSCD 2019年第5期13-14,共2页
Frequency combs[1, 2] consisting of equally-spaced frequencylines can be fully described by two frequencies, i.e., carrieroffset (fCEO) and repetition rate (frep). Once the two frequenciesare stabilized, the frequency... Frequency combs[1, 2] consisting of equally-spaced frequencylines can be fully described by two frequencies, i.e., carrieroffset (fCEO) and repetition rate (frep). Once the two frequenciesare stabilized, the frequency comb is well defined. Frequencycombs can be used for various applications, i.e., metrology,spectroscopy, timing, communications, absolute distancemeasurements, and so on, due to their two importantcharacteristics, i.e., stabilized frequency lines and ultra-shortoptical pulses (if the mode-locking is obtained) as shown inFig. 1. 展开更多
关键词 QCL semiconductor-based TERAHERTZ frequency COMBS
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A Metal-free Polyimide Photocatalyst for the Oxidation of Amines to Imines 被引量:1
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作者 Zhou Yafen Cheng Hong +5 位作者 Song Yu Wang Qing Zhao Wenjie Chen Qilin Zhou Limei Xu Bin 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2023年第3期92-103,共12页
Polyimide(PI) is an organic polymer material with good stability and diverse sources that has attracted widespread attention in the field of photocatalysis. In this study, a series of PI photocatalysts were synthesize... Polyimide(PI) is an organic polymer material with good stability and diverse sources that has attracted widespread attention in the field of photocatalysis. In this study, a series of PI photocatalysts were synthesized by a thermal polymerization approach using pyromellitic dianhydride(PMDA) and various diamine monomers(melamine(MA), 4,4′-oxydianiline, and melem) as the precursors as well as different heating rates. The effects of the diamine precursor and heating rate on the structure, composition, morphology, and optical properties of the as-prepared PI materials were systematically investigated by various characterization techniques. The selective photo-oxidation of benzylamine was used as a model reaction to evaluate the photocatalytic activities of the resulting PI samples for the oxidation of amines to imines. The results revealed that the PI sample prepared using MA and PMDA as the precursors and a heating rate of 7 ℃/min(MA-PI-7) exhibited the best catalytic performance, with 98% benzylamine conversion and 98% selectivity for N-benzylidene benzylamine after 4 h of irradiation. Several benzylamine derivatives and heterocyclic amines also underwent the photo-oxidation reaction over the MA-PI-7 catalyst to afford the corresponding imines with good activity. In addition, MA-PI-7 exhibited good stability over four successive photocatalytic cycles. 展开更多
关键词 POLYIMIDE photocatalyst OXIDATION amine IMINE
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Recent progress in research and design concepts for the characterization,testing,and photocatalysts for nitrogen reduction reaction 被引量:3
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作者 Benteng Sun Shucao Lu +2 位作者 Yeye Qian Xiaoli Zhang Jian Tian 《Carbon Energy》 SCIE CSCD 2023年第3期19-74,共56页
The reduction of molecular nitrogen(N_(2))to ammonia(NH_(3))under mild conditions is one of the most promising studies in the energy field due to the important role of NH_(3)in modern industry,production,and life.The ... The reduction of molecular nitrogen(N_(2))to ammonia(NH_(3))under mild conditions is one of the most promising studies in the energy field due to the important role of NH_(3)in modern industry,production,and life.The photocatalytic reduction of N_(2)is expected to achieve clean and sustainable NH_(3)production by using clean solar energy.To date,the new photocatalysts for photocatalytic reduction of N_(2)to NH_(3)at room temperature and atmospheric pressure have not been fully developed.The major challenge is to achieve high light-absorption efficiency,conversion efficiency,and stability of photocatalysts.Herein,the methods for measuring produced NH_(3)are compared,and the problems related to possible NH_(3)pollution in photocatalytic systems are mentioned to provide accurate ideas for measuring photocatalytic efficiency.The recent progress of nitrogen reduction reaction(NRR)photocatalysts at ambient temperature and pressure is summarized by introducing charge transfer,migration,and separation in photocatalytic NRR,which provides a guidance for the selection of future photocatalyst.More importantly,we introduce the latest research strategies of photocatalysts in detail,which can guide the preparation and design of photocatalysts with high NRR activity. 展开更多
关键词 nitrogen reduction reaction photocatalystS produced NH 3 measuring methods reaction mechanism research strategy
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Recent advances in bismuth-based photocatalysts:Environment and energy applications 被引量:2
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作者 Sijia Song Zipeng Xing +2 位作者 Huanan Zhao Zhenzi Li Wei Zhou 《Green Energy & Environment》 SCIE EI CAS CSCD 2023年第5期1232-1264,共33页
Photocatalysis is an effective way to solve the problems of environmental pollution and energy shortage.Numerous photocatalysts have been developed and various strategies have been proposed to improve the photocatalyt... Photocatalysis is an effective way to solve the problems of environmental pollution and energy shortage.Numerous photocatalysts have been developed and various strategies have been proposed to improve the photocatalytic performance.Among them,Bi-based photocatalysts have become one of the most popular research topics due to their suitable band gaps,unique layered structures,and physicochemical properties.In this review,Bi-based photocatalysts(BiOX,BiVO_(4),Bi_(2)S_(3),Bi_(2)MoO_(6),and other Bi-based photocatalysts)have been summarized in the field of photocatalysis,including their applications of the removal of organic pollutants,hydrogen production,oxygen production etc.The preparation strategies on how to improve the photocatalytic performance and the possible photocatalytic mechanism are also summarized,which could supply new insights for fabricating high-efficient Bi-based photocatalysts.Finally,we summarize the current challenges and make a reasonable outlook on the future development direction of Bi-based photocatalysts. 展开更多
关键词 PHOTOCATALYSIS Bismuth based photocatalyst Hydrogen evolution Solar fuel energy Environment remediation
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Waste fly ash-ZnO as a novel sunlight-responsive photocatalyst for dye discoloration
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作者 Leena V.Bora Sonal P.Thakkar +1 位作者 Kevin S.Vadaliya Nisha V.Bora 《Water Science and Engineering》 EI CAS CSCD 2023年第1期76-82,共7页
Treating waste with a waste material using freely available solar energy is the most effective way towards sustainable future.In this study,a novel photocatalyst,partly derived from waste material from the coal indust... Treating waste with a waste material using freely available solar energy is the most effective way towards sustainable future.In this study,a novel photocatalyst,partly derived from waste material from the coal industry,was developed.Fly ash hybridized with ZnO(FAeZn)was synthesized as a potential photocatalyst for dye discoloration.The synthesized photocatalyst was characterized by X-ray diffraction,scanning electron microscopy,transmission electron microscopy,and ultravioletevisible/near infra-red spectroscopy.The photocatalytic activity was examined with the discoloration of methylene blue used as synthetic dye wastewater.All the experiments were performed in direct sunlight.The photocatalytic performance of FAeZn was found to be better than that of ZnO and the conventionally popular TiO2.The LangmuireHinshelwood model rate constant values of ZnO,TiO2,and FAeZn were found to be 0.016 min1,0.017 min1,and 0.020 min1,respectively.There were two reasons for this:(1)FAeZn was able to utilize both ultraviolet and visible parts of the solar spectrum,and(2)its BrunauereEmmetteTeller surface area and porosity were significantly enhanced.This led to increased photon absorption and dye adsorption,thus exhibiting an energy-efficient performance.Therefore,FAeZn,partly derived from waste,can serve as a suitable material for environmental remediation and practical solar energy applications. 展开更多
关键词 photocatalyst ZNO Fly ash GEOPOLYMER Wastewater treatment Methylene blue
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Recycling Spent LiCoO_(2)Battery as a High-efficient Lithiumdoped Graphitic Carbon Nitride/Co_(3)O_(4)Composite Photocatalyst and Its Synergistic Photocatalytic Mechanism
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作者 Bo Niu Jiefeng Xiao Zhenming Xu 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2023年第2期45-53,共9页
The ever-increasing quantity of spent lithium-ion batteries(LIBs)is both a potential environmental pollutant and a valuable resource.The spent LIBs recycling mainly aimed at the separation of valuable elements.Some is... The ever-increasing quantity of spent lithium-ion batteries(LIBs)is both a potential environmental pollutant and a valuable resource.The spent LIBs recycling mainly aimed at the separation of valuable elements.Some issues still exist in these processes such as high energy consumption and complex separation procedures.This study avoided element separation and proposed a facile approach to transform spent LiCoO_(2) electrode into a lithium(Li)-doped graphitic carbon nitride(g-C_(3)N_(4))/Co_(3)O_(4) composite photocatalyst through one-pot in situ thermal reduction.During the thermal process,melamine served as the reductant for LiCoO_(2) decomposition and the raw material for g-C_(3)N_(4) production.Li was in situ doped in g-C_(3)N_(4) and the generated Co_(3)O_(4) was in situ integrated,forming a Li-doped g-C_(3)N_(4)/Co_(3)O_(4) composite photocatalyst.This special composite exhibited an enhanced photocatalytic performance,and its photocatalytic H2 production and RhB degradation rates were 8.7 and 6.8 times higher than those of g-C_(3)N_(4).The experiments combined with DFT calculation revealed that such enhanced photocatalytic efficiency was ascribed to the synergy effect of Li doping and Co_(3)O_(4) integrating,which extended the visible light absorption(450-900 nm)and facilitated the charge transfer and separation.This study transforms waste into a high-efficient catalyst,realizing high-valued utilization of waste and environmental protection. 展开更多
关键词 composite photocatalyst environmental protection spent LIBs synergy mechanism waste utilization
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MoS_(2)/ZnO异质结纳米材料降解亚甲基蓝的光催化性能研究 被引量:1
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作者 王进美 蒋守杰 +2 位作者 王春霞 王丽丽 高大伟 《西安工程大学学报》 CAS 2024年第1期24-30,共7页
为了提高ZnO的光转换效率,选用带隙较低的MoS_(2)形成异质结提高ZnO的光催化性能。通过水热法制备ZnO纳米棒,并进一步制备MoS_(2)/ZnO异质结构的纳米复合材料。通过扫描电镜(SEM)、X射线粉末衍射仪(XRD)、固体紫外可见漫反射测试仪(UV-V... 为了提高ZnO的光转换效率,选用带隙较低的MoS_(2)形成异质结提高ZnO的光催化性能。通过水热法制备ZnO纳米棒,并进一步制备MoS_(2)/ZnO异质结构的纳米复合材料。通过扫描电镜(SEM)、X射线粉末衍射仪(XRD)、固体紫外可见漫反射测试仪(UV-Vis)和紫外可见分光光度计(UV-245)等分析方法对样品的形貌、结构及光学性能等进行表征。结果表明,MoS_(2)/ZnO异质结复合材料呈棒状结构,并由于内建电场存在可有效增强光生载流子的分离效率,进而提高了可见光区的吸收,提高了光催化性能。在模拟太阳光(包含紫外波段)下,60 min时MoS_(2)-15/ZnO纳米复合材料对亚甲基蓝的降解率可达99%,比纯ZnO的降解率提高了10%。 展开更多
关键词 MoS_(2)/ZnO 光催化 异质结 亚甲基蓝 纳米复合材料
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Synthesis of AgCl/Ti_(3)C_(2)@TiO_(2)Ternary Composite Photocatalysts for Photocatalytic Oxidation of 1,4-Dihydropyridine and Tetracycline Hydrochloride
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作者 Wu Hanliu Quan Yan +3 位作者 Liu Meiling Tian Xuemei Ren Chunguang Wang Zhonghua 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2023年第2期10-23,共14页
AgCl/Ti_(3)C_(2)@TiO_(2)ternary composites were prepared to form a heterojunction structure between AgCl and TiO_(2)and introduce Ti3C2 as a cocatalyst.The as-prepared AgCl/Ti_(3)C_(2)@TiO_(2)composites showed higher ... AgCl/Ti_(3)C_(2)@TiO_(2)ternary composites were prepared to form a heterojunction structure between AgCl and TiO_(2)and introduce Ti3C2 as a cocatalyst.The as-prepared AgCl/Ti_(3)C_(2)@TiO_(2)composites showed higher photocatalytic activity than pure AgCl and Ti_(3)C_(2)@TiO_(2)for photooxidation of a 1,4-dihydropyridine derivative(1,4-DHP)and tetracycline hydrochloride(TCH)under visible light irradiation(λ>400 nm).The photocatalytic activity of AgCl/Ti_(3)C_(2)@TiO_(2)composites depended on Ti_(3)C_(2)@TiO_(2)content,and the catalytic activity of the optimized samples were 6.9 times higher than that of pure AgCl for 1,4-DHP photodehydrogenation and 7.3 times higher than that of Ti_(3)C_(2)@TiO_(2)for TCH photooxidation.The increased photocatalytic activity was due to the formation of a heterojunction structure between AgCl and TiO_(2)and the introduction of Ti3C2 as a cocatalyst,which lowered the internal resistance,sped up the charge transfer,and increased the separation efficiency of photogenerated carries.Photogenerated holes and superoxide radical anions were the major active species in the photocatalytic process. 展开更多
关键词 AgCl/Ti_(3)C_(2)@TiO_(2) composite photocatalyst COCATALYST heterojunction structure in situ solvothermal growth method
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三维球状BiOI/BiOBr异质结光催化剂制备及其光催化脱汞性能
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作者 张安超 张旭 +5 位作者 张倩倩 李海霞 王华 梅艳阳 郑海坤 陈国艳 《河南理工大学学报(自然科学版)》 CAS 北大核心 2024年第1期78-87,共10页
光催化氧化技术是治理污染物排放的重要手段。目的为增强BiOBr对可见光的利用率并提高其光催化活性,方法采用共沉淀法制备碘掺杂的三维球状BiOI/BiOBr异质结光催化剂,使用X射线衍射、紫外-可见漫反射光谱、扫描电子显微镜扫描、N2吸附-... 光催化氧化技术是治理污染物排放的重要手段。目的为增强BiOBr对可见光的利用率并提高其光催化活性,方法采用共沉淀法制备碘掺杂的三维球状BiOI/BiOBr异质结光催化剂,使用X射线衍射、紫外-可见漫反射光谱、扫描电子显微镜扫描、N2吸附-脱附、X射线光电子能谱和电子自旋共振波谱等对样品结构进行表征,开展光催化脱除单质汞(Hg0)性能研究。结果结果表明,随着I含量升高,BiOBr衍射峰逐渐降低,BiOI衍射峰逐渐增强;BiOI/BiOBr复合光催化剂保留了BiOBr的三维微球形貌,BiOI均匀分散于BiOBr表面,且复合后比表面积有所提高,较大的表面积能提供更多的反应空间,促进活性自由基产生和提高光催化剂性能;与BiOBr相比,复合光催化剂的带隙能降低,可见光响应能力大幅增强。BiOI/BiOBr光催化脱汞性能高于单纯BiOI与单纯BiOBr;BiOI和BiOBr摩尔比为2∶8时,光催化剂脱汞效率高达98%,是单纯BiOBr的2.58倍;酸性条件下制备的BiOI/BiOBr异质结光催化剂会与碱性溶液反应,引起光催化剂成分的变化,进而影响光催化剂的催化性能;Hg0高效光催化氧化过程中,阴离子超氧自由基(•O_(2)^(-))和空穴(h^(+))是主要活性物质。结论研究结果可为卤氧化铋光催化剂的复合制备及其在脱汞领域的应用提供理论依据。 展开更多
关键词 异质结 光催化剂 溴氧化铋 碘氧化铋 单质汞
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微球状Br掺杂BiOCl复合光催化剂去除单质汞研究
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作者 张安超 张景繁 +4 位作者 张丹 孙志君 张旭 刘艳雯 郑海坤 《河南理工大学学报(自然科学版)》 CAS 北大核心 2024年第6期90-99,共10页
光催化氧化法是治理大气环境汞污染问题的有效手段。目的为开发低成本的可见光脱汞催化剂,方法采用一步共沉淀法合成不同溴(Br)含量的BiOBr_(x)Cl_(1−x)微球复合材料,在湿法光催化脱汞装置上考察它们在荧光灯辐照下的光催化活性,利用N_... 光催化氧化法是治理大气环境汞污染问题的有效手段。目的为开发低成本的可见光脱汞催化剂,方法采用一步共沉淀法合成不同溴(Br)含量的BiOBr_(x)Cl_(1−x)微球复合材料,在湿法光催化脱汞装置上考察它们在荧光灯辐照下的光催化活性,利用N_(2)吸附-脱附、XRD、UV-Vis DRS、SEM、HRTEM、XPS和ESR等技术对其结构进行分析,并采用密度泛函理论研究BiOCl和BiOBr之间的电荷转移规律。结果结果表明,相较于BiOCl和BiOBr,BiOBrxCl_(1−x)复合材料的光催化性能均得到提升,其中BiOBr_(0.2)Cl_(0.8)光催化剂的脱汞效率高达90.3%,较BiOCl提高了50%;与NO_(3)^(-)和SO_(4)^(2−)相比,Cl^(−)和CO_(2)−3对BiOBr_(0.2)Cl_(0.8)光催化剂脱汞性能的抑制作用更显著;BiOBr_(0.2)Cl_(0.8)复合材料的比表面积均略高于BiOBr的和BiOCl的,较高的比表面积有利于光催化剂提供较多的活性位;随着Br含量逐渐增加,BiOCl的XRD特征峰强度逐渐减弱,复合材料的光吸收能力有规律地红移,表明BiOBr与BiOCl之间存在较强的相互作用,并非简单的机械混合;与BiOCl相比,BiOBr_(0.2)Cl_(0.8)复合材料的Bi 4f和O 1s均向高结合能方向偏移,表明引入Br影响了BiOCl中Bi和O的存在形态;3种活性物参与了Hg^(0)的氧化脱除过程,其作用由大到小依次为·O_(2)^(−),h^(+),·OH。结论光催化活性的提高主要原因为BiOCl与BiOBr形成了Z型异质结,从而增强了光生电荷的分离。研究结果可为低成本、高效卤氧化铋基脱汞光催化剂的开发提供新思路。 展开更多
关键词 光催化剂 氯氧化铋 溴氧化铋 单质汞脱除
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PCN/FeOOH协同光催化/芬顿材料的制备及其催化降解性能
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作者 王娟 侯爱芹 +1 位作者 高爱芹 谢孔良 《印染》 CAS 北大核心 2024年第3期1-5,共5页
利用煅烧法和尿素/乙醇溶液协同介导法制备了磷掺杂g-C_(3)N_(4)纳米片(PCN)和αFeOOH复合的协同光催化/芬顿体系PCN/FeOOH,以罗丹明B(RhB)为污染物,研究其光催化降解性能。结果表明,复合催化剂的光催化性能与单一的PCN或FeOOH相比显著... 利用煅烧法和尿素/乙醇溶液协同介导法制备了磷掺杂g-C_(3)N_(4)纳米片(PCN)和αFeOOH复合的协同光催化/芬顿体系PCN/FeOOH,以罗丹明B(RhB)为污染物,研究其光催化降解性能。结果表明,复合催化剂的光催化性能与单一的PCN或FeOOH相比显著提高,分别为单独PCN光催化和单独FeOOH芬顿体系的2.99倍和3.59倍。在催化剂质量浓度为0.8 g/L,过氧化氢物质的量浓度为20 mmol/L,300 W氙灯下降解90 min,pH为3的条件下,对质量浓度为5mg/L的RhB降解率可以达到98.5%,降解过程符合一级动力学模型。 展开更多
关键词 g-C_(3)N_(4) FEOOH 复合光催化剂 芬顿 降解
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TiO_(2)-GO复合光催化剂对工业废水吸附降解作用的研究
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作者 张勤 石秋红 《化学工程师》 CAS 2024年第5期49-53,共5页
本文以H_(3)PO_(4)、石墨粉、浓H_(2)SO_(4)等试剂为原料制备二氧化钛-氧化石墨烯(TiO_(2)-GO)复合光催化剂,以不同浓度的亚甲基蓝溶液模拟工业废水,通过向工业废水中加入催化剂进行降解吸附实验,考察在不同条件下所合成的催化剂对工业... 本文以H_(3)PO_(4)、石墨粉、浓H_(2)SO_(4)等试剂为原料制备二氧化钛-氧化石墨烯(TiO_(2)-GO)复合光催化剂,以不同浓度的亚甲基蓝溶液模拟工业废水,通过向工业废水中加入催化剂进行降解吸附实验,考察在不同条件下所合成的催化剂对工业废水的吸附降解效果,并通过光反应仪器、热重分析仪等仪器量化分析催化剂吸附降解效果,实验结果表明,合成催化剂(TiO_(2)-GO)对多种工业废水有较好的吸附降解效果;在光照条件下,催化剂的量为10g·L^(-1)、作用时间为210min时,吸附降解效果最佳;催化剂对工业废水吸附降解性能稳定,可重复使用。 展开更多
关键词 光催化剂 工业废水 吸附降解 效果
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Z型异质结Cu_(2)O/Bi_(2)MoO_(6)的构建及光催化降解性能
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作者 赵强 郭智楠 +5 位作者 李淑英 王俊丽 李作鹏 贾治芳 王科伟 郭永 《无机化学学报》 SCIE CAS CSCD 北大核心 2024年第5期885-894,共10页
通过水热法制备出一系列Z型异质结Cu_(2)O/Bi_(2)MoO_(6)新型光催化剂。采用扫描电子显微镜、粉末X射线衍射、红外光谱、紫外可见吸收光谱等表征手段研究了催化剂的形貌、结构性质和光电化学性质,并以四环素(TC)为降解目标污染物,进一... 通过水热法制备出一系列Z型异质结Cu_(2)O/Bi_(2)MoO_(6)新型光催化剂。采用扫描电子显微镜、粉末X射线衍射、红外光谱、紫外可见吸收光谱等表征手段研究了催化剂的形貌、结构性质和光电化学性质,并以四环素(TC)为降解目标污染物,进一步探究了其催化效率。实验结果表明,Cu_(2)O的加入提高了复合催化剂的光催化性能,其中20%Cu_(2)O/Bi_(2)MoO_(6)复合催化剂(Cu_(2)O和Bi_(2)MoO_(6)的质量比为20%)降解效果最好,100 min内可降解95%的TC。Cu_(2)O与Bi_(2)MoO_(6)之间的协同作用使其可以吸收更多的可见光,所构建的Z型异质结改变了电子转移途径,提高了电子与空穴的分离效率,光催化活性显著提高。通过自由基捕获实验和能带结构,分析了Z型异质结Cu_(2)O/Bi_(2)MoO_(6)复合催化剂光催化降解TC可能的机理。 展开更多
关键词 光催化剂 钼酸铋 氧化亚铜 Cu_(2)O/Bi_(2)MoO_(6) Z型异质结 四环素
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Pt NPs增强ZnO@ZnS核-壳异质纳米棒光催化产氢性能研究
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作者 朱泉雯 任华娟 +3 位作者 刘学方 张军 陈铭 侯建华 《现代化工》 CAS CSCD 北大核心 2024年第11期215-222,共8页
采用原位光沉积方法将铂纳米颗粒(Pt NPs)负载在核-壳异质纳米棒ZnO@ZnS表面,制备出ZnO@ZnS/Pt复合光催化剂。调控Pt NPs在ZnO@ZnS表面的负载量,探究了不同质量的Pt NPs对光催化产氢气性能的影响。结果表明,当贵金属Pt的负载量为2%(ZnO@... 采用原位光沉积方法将铂纳米颗粒(Pt NPs)负载在核-壳异质纳米棒ZnO@ZnS表面,制备出ZnO@ZnS/Pt复合光催化剂。调控Pt NPs在ZnO@ZnS表面的负载量,探究了不同质量的Pt NPs对光催化产氢气性能的影响。结果表明,当贵金属Pt的负载量为2%(ZnO@ZnS/Pt-2)时,复合光催化产H_(2)性能最好,产氢速率为4.52 mmol/(g·h),是ZnO@ZnS的1.8倍,催化剂表现出优异的催化稳定性。在此复合材料中,贵金属Pt纳米颗粒作为助催化剂,Pt对H~+具有较低的吸附能,优先吸附H~+,光生电子转移到Pt纳米粒子表面,H^(+)在其表面得到光生电子,被还原为氢气,成功地抑制了光生电子和空穴的复合,有效地提升了催化剂的催化性能。 展开更多
关键词 ZnO@ZnS核-壳纳米棒 Pt助催化剂 复合光催化剂 光催化产氢 产氢性能
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物相调控对铌酸钠纳米棒压电-弱可见光协同催化的优化作用 被引量:1
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作者 刘洋 张淑乐 +4 位作者 李欣玥 刘嫣然 卢佳杉 卢相扬 许柘宓 《聊城大学学报(自然科学版)》 2024年第3期34-41,共8页
半导体材料能够吸收光能产生电子空穴对,利用光催化实现环境废物降解,然而其催化效率受环境光条件和天气等因素严重制约。因此,有必要研发能够利用环境中的水波能和光能协同作用的催化剂,以有效提升水相环境的污染物降解效率。无铅钙钛... 半导体材料能够吸收光能产生电子空穴对,利用光催化实现环境废物降解,然而其催化效率受环境光条件和天气等因素严重制约。因此,有必要研发能够利用环境中的水波能和光能协同作用的催化剂,以有效提升水相环境的污染物降解效率。无铅钙钛矿结构的铌酸钠具有适宜的能隙和压电性能,因此具备实现光-压电协同催化的潜力。通过水热法合成并调控了铌酸钠纳米棒的物相结构,探究了其对光-压电协同催化中的性能增强机制。虽然两种物相的铌酸钠光催化效率差异较小,但相较NaNbO_(3),Na_(7)(H_(3)O)Nb_(6)O_(19)14(H_(2)O)表现出更高的压电性能,因此在压电光催化过程中能够更好地促进光生电子空穴对的分离,从而大幅提升了水中四环素的降解效率。进一步对材料物相调控方法、催化机理等开展研究,揭示了空穴和羟基自由基在催化过程中起到关键作用,研究结果能够为高效光-压电协同催化剂的设计、开发和优化提供参考。 展开更多
关键词 铌酸钠 压电-光催化 载流子分离 压电效应
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水热反应温度对ZnIn_(2)S_(4)/Bi_(2)WO_(6)复合催化剂的影响研究
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作者 王震 刘婷婷 +1 位作者 张强 王磊 《功能材料》 CAS CSCD 北大核心 2024年第7期7191-7199,共9页
为解决传统半导体光催化剂可见光响应能力弱、光生电子空穴复合快、能带结构导致载流子氧化还原能力弱等问题,采用水热法制备ZnIn_(2)S_(4)/Bi_(2)WO_(6)(ZlS@BW)复合催化剂并系统研究水热反应温度对其结构性能的影响。当水热温度从80... 为解决传统半导体光催化剂可见光响应能力弱、光生电子空穴复合快、能带结构导致载流子氧化还原能力弱等问题,采用水热法制备ZnIn_(2)S_(4)/Bi_(2)WO_(6)(ZlS@BW)复合催化剂并系统研究水热反应温度对其结构性能的影响。当水热温度从80℃升高到160℃,ZlS@BW复合光催化剂结晶度提高,形貌转变为致密核壳结构,比表面积和光电性能先降低再升高,氟伐他汀去除率逐步上升。而当温度升高到200℃时,核壳结构遭到了破坏,比表面积和光电性能变差,氟伐他汀的降解效果降低,光催化性能下降。结果表明,水热温度为160℃时,制备的ZlS@BW复合光催化剂晶型结晶程度较高,且形貌致密,比表面积最大,产生的瞬态光电流最大,阻抗半径最小,具有最优光催化性能。对污染物氟伐他汀降的降解效率最高,可达到75.47%。 展开更多
关键词 水热法 水热反应温度 ZnIn_(2)S_(4)/Bi_(2)WO_(6)复合催化剂 光催化
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Mo-g-C_(3)N_(4)制备与可见光催化性能
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作者 艾兵 蒋泓城 +1 位作者 何海南 李德刚 《山东理工大学学报(自然科学版)》 CAS 2024年第4期66-70,78,共6页
以三聚氰胺和四水合钼酸铵为前驱体,利用一锅法制备了不同钼掺杂浓度的石墨型氮化碳光催化剂。利用X射线衍射(XRD)、红外光谱(FT-IR)、荧光光谱(PL)、扫描电子显微镜(SEM)等测试技术对合成催化剂进行了表征,结果发现:钼掺杂的氮化碳光... 以三聚氰胺和四水合钼酸铵为前驱体,利用一锅法制备了不同钼掺杂浓度的石墨型氮化碳光催化剂。利用X射线衍射(XRD)、红外光谱(FT-IR)、荧光光谱(PL)、扫描电子显微镜(SEM)等测试技术对合成催化剂进行了表征,结果发现:钼掺杂的氮化碳光催化剂具有石墨型结构,Mo的引入扩展了氮化碳的光谱响应范围,降低了光生电子和空穴的复合速率。亚甲基蓝的可见光降解测试表明,钼掺杂的氮化碳光催化剂比纯氮化碳展现出更高的光催化活性,掺杂浓度0.7%光催化剂的反应速率常数为纯氮化碳的1.4倍;同时,研究了Mo掺杂g-C_(3)N_(4)光催化降解性能的影响因素。 展开更多
关键词 石墨型氮化碳 钼掺杂 光催化剂 降解
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