采用溶胶-凝胶法和水热法合成C-TiO2/CdS复合催化剂,并使用静电纺丝法以聚乙烯醇(PVA)为模板剂制备纳米纤维膜载体,通过浸渍法负载催化剂制成壳-核状的C-TiO2/CdS复合纤维膜。通过X射线衍射、X射线光电子能谱技术、漫反射光谱和扫描电镜对催化剂结构组成和形貌进行分析。以乙醇为牺牲试剂,测试了C-TiO2/CdS复合纤维膜在可见光下的产氢性能。光催化实验结果表明:相比纯TiO2,复合纤维膜产氢效率更高且方便回收再使用,1.5g葡萄糖作C源、0.15g CdCl2改性的C-TiO2/CdS、乙醇浓度为30%时复合纤维膜产氢效率最高,可见光下反应6h后达4730μmol,是纯TiO2产氢量312μmol的14倍。
The C-titanium dioxide(TiO2)/cadmium sulfide(CdS)composite nanocatalyst was synthesized by the sol-gel and hydrothermal method.The nanofiber membrane carrier was prepared by the electrospinning method with polyvinyl alcohol (PVA) as the template.The catalyst was loaded by the impregnation method to make the shell C-TiO2/CdS composite fiber membrane with core structure.The structure,composition and morphology of the catalyst were analyzed by XRD,XPS,DRS and SEM.The hydrogen production activity of C-TiO2/CdS under visible light was tested using ethanol as sacrificial agent.Photocatalysis experiments shown that,compared with TiO2,the membrane had a higher hydrogen production efficiency,and was convenient for recycling and reuse.When 1.5g glucose was used as C source,0.15g CdCl2-modified C-TiO2/CdS,and the concentration of ethanol was 30%,the hydrogen production efficiency reached 4730μmol after 6h reaction under visible light,which was 14 times that of pure TiO2 of 312μmol.
[1] Wang L Q,Han J,Feng J M,et al.Simultaneously efficient light absorption and charge transport of CdS/TiO2 nanotube array toward improved photoelectrochemical performance[J].International Journal of Hydrogen Energy,2019,44(59):30899-30909.
[2] Wang H,Zhao Y,Wang Y,et al.Construction of 2D/1D composite C3N4/CdS photocatalysts and study on photocatalytic hydrogen evolution performance[J].Journal of Functional Materials,2017,48(7):7149-7153.
[3] Zhao N,Hu Y,Du J L,et al.Ti3C2Tx MXene-derived amorphous TiO2-C nanosheet cocatalysts coupled CdS nanostructures for enhanced photocatalytic hydrogen evolution[J].Applied Surface Science,2020,530:147247.
[4] Yu X,Lu X L,Qin G,et al.Large-scale synthesis of flexible TiO2/N-doped carbon nanofibres:a highly efficient all-day-active photocatalyst with electron storage capacity[J].Ceramics International,2018,46(8):12538-12547.
[5] Zhao Q Q,Feng G,Jiang F,et al.Comparison of Fe2TiO5/C photocatalysts synthesized via a nonhydrolytic sol-gel method and solid-state reaction method[J].RSC Advances,2020,10(71):43762-43772.
[6] Xu X.TiO2 Modified with C,N originated from pyridine organic compounds for photocatalytic hydrogen evolution[D].Zhejiang:Zhejiang University of Technology,2019.
[7] Cheng G,Xu F,Xiong J,et al.Enhanced adsorption and photocatalysis capability of ge-nerally synthesized TiO2-carbon materials hybrids[J].Advanced Powder Technology,2016,27(5):1949-1962.
[8] Rambabu Y,Dhua S,Jaiswal M,et al.High photoelectrochemical performance of reduced graphene oxide wrapped,CdS functionalized,TiO2 multi-leg nanotubes[J].Nanotechnology,2020,31(27):275701.
[9] Janbandhu S Y,Joshi A,Munishwar S R,et al.CdS/TiO2 heterojunction in glass matrix:synthesis,characterization,and application as an improved photocatalyst[J].Applied Surface Science,2019,497:143758.
[10] Wang Z L,Chen Y F,Zhang L Y,et al.Step-scheme CdS/TiO2 nanocomposite hollow microsphere with enhanced photocatalytic CO2 reduction activity[J].Journal of Materials Science & Technology.2020,56(21):143-150.
[11] Zangeneh H,Rahimi Z,Zinatizadeh A A,et al.L-histidine doped-TiO2-CdS nanocomposite blended UF membranes with photocatalytic and self-cleaning properties for remediation of effluent from a local waste stabilization pond (WSP) under visible light[J].Process Safety and Environmental Protection,2020,136:92-104.
[12] Mollavali M,Falamaki C,Rohani S.Efficient light harvesting by NiS/CdS/ZnS NPs incorporated in C,N-co-doped-TiO2 nanotube arrays as visible-light sensitive multilayer photoanode for solar applications[J].International Journal of Hydrogen Energy,2018,43(19):9259-9278.
[13] Zhao W J.Electrospinning preparation and photocatalytic properties of Titanium based heterojunction composite nanofibers[D].Zhejiang:Zhejiang Sci-Tech University,2019.
[14] Mousavi S,Shahraki F,Aliabadi M,et al.Nanofiber immobilized CeO2/dendrimer nano-particles:an efficient photocatalyst in the visible and the UV[J].Applied Surface Science,2019,479:608-618.
[15] Jeong T,Lee S.Photocatalytic self-cleaning by nanocomposite fibers containing titanium dioxide nanoparticles[J].Fibers and Polymers,2019,20:25-34.
[16] Hu J Y,Liu S,Wu D S,et al.Efficient light harvesting by NiS/CdS/ZnS NPs incorporated in C,N-co-doped-TiO2 nanotube arrays as visible-light sensitive multilayer photoanode for solar applications[J].Journal of Functional Materials,2020,51(7):7148-7154.
[17] Yagizatli Y,Ulas B,Cali A,et al.Improved fuel cell properties of Nano-TiO2 doped Poly(Vinylidene fluoride) and phosphonated poly(Vinyl alcohol) composite blend membranes for PEM fuel cells[J].International Journal of Hydrogen Energy,2020,45(60):35130-35138.
[18] Li C,Zhang H,Wang F,et al.PVA and CS cross-linking combined with in situ chimeric SiO2 nanoparticle adhesion to enhance the hydrophilicity and antibacterial properties of PTFE flat membranes[J].RSC Advances,2019,9(33):19205-19216.
[19] Chaudhari S,Kwon Y S,Shon M Y,et al.Stability and pervaporation characteristics of PVA and its blend with PVAm membranes in a ternary feed mixture containing highly reactive epichlorohydrin[J].RSC Advances,2019,9(11):5908-5917.
[20] Midya L,Sarkar A N,Das R,et al.Crosslinked chitosan embedded TiO2 NPs and carbon dots-based nanocomposite:an excellent photocatalyst under sunlight irradiation[J].International Journal of Biological Macromolecules,2020,164:3676-3686.
