Decoration of Ti/TiO2 Nanotubes with Pt Nanoparticles for Enhanced UV-Vis Light Absorption in Photoelectrocatalytic Process
نویسندگان
چکیده
Nanotubos de TiO2 (TiO2NTs) foram decorados com nanopartículas de Pt via deposição catódica. Estas nanopartículas foram uniformemente distribuídas, altamente separadas e espaçadas sobre toda a superfície do TiO2NT para o menor tempo de deposição, com os tamanhos das partículas de Pt proporcionais às cargas aplicadas. O fotoeletrodo de Pt/TiO2NTs apresentou intenso pico de absorção na região do visível com significativo deslocamento para vermelho induzido pela platina depositada na superfície do TiO2NTs, diminuindo a energia do band gap de 3,21 eV para 2,87 eV. O fotoeletrodo de Pt/TiO2NTs foi testado na oxidação fotoeletrocatalítica do corante Vermelho Ácido 29 com grande sucesso. Descoloração total e 92% de remoção do carbono orgânico total foram obtidos após 120 min de tratamento empregando o fotoeletrodo de Pt/TiO2NTs, o qual apresentou valores superiores aos do não-decorado (87% e 68%, respectivamente), devido ao melhor uso da radiação e da minimização da recombinação de carga.
منابع مشابه
Efficiently Visible-Light Driven Photoelectrocatalytic Oxidation of As(III) at Low Positive Biasing Using Pt/TiO2 Nanotube Electrode
A constant current deposition method was selected to load highly dispersed Pt nanoparticles on TiO2 nanotubes in this paper, to extend the excited spectrum range of TiO2-based photocatalysts to visible light. The morphology, elemental composition, and light absorption capability of as-obtained Pt/TiO2 nanotubes electrodes were characterized by FE-SEM, energy dispersive spectrometer (EDS), X-ray...
متن کاملSurface Plasmon Enhanced Photocatalysis of Au/Pt-decorated TiO2 Nanopillar Arrays
The low quantum yields and lack of visible light utilization hinder the practical application of TiO2 in high-performance photocatalysis. Herein, we present a design of TiO2 nanopillar arrays (NPAs) decorated with both Au and Pt nanoparticles (NPs) directly synthesized through successive ion layer adsorption and reaction (SILAR) at room temperature. Au/Pt NPs with sizes of ~4 nm are well-disper...
متن کاملDesign of Highly Uniform Platinum and Palladium Nanoparticle Decoration on TiO2 Nanotube Arrays: An Efficient Anode to the Electro-Oxidation of Alcohols
We explore electro-catalytic properties of a system consisting of platinum and palladium nanoparticles dispersed over a nanotubular self-organized TiO2 matrix. These electrodes prepared by electroess and microemulsion of palladium and palladium nanoparticles on to TiO2 nanotubes, respectively. Titanium oxide nanotubes were fabricated by anodizing titanium foil in ethylene glycol (EG) fluoride-c...
متن کاملComparison of Photocatalytic Activities of Two Different Dyes Using Pt-Modified TiO2 Nanoparticles under Visible Light
The photocatalytic degradation of Acid Red 91 (AR91) and Acid Yellow 23 (AY23) with different molecular structures and different substitute groups using Pt modified TiO2 (PtTiO2 ) nanoparticles was investigated in the presence of visible light irradiation. Pt-TiO2 nanoparticles were prepared with photodiposition method (PD) and characterized by X-ray diffraction (XRD), scanning electron microgr...
متن کاملControllable fabrication of immobilized ternary CdS/Pt-TiO2 heteronanostructures toward high-performance visible-light driven photocatalysis.
Immobilized TiO2 nanotube arrays (NTAs) co-modified with Pt and CdS nanoparticles were fabricated by using the combination of photoreduction and chemical bath deposition methods. XRD, SEM, TEM, XPS, UV-Vis and EDX methods were employed to characterize the microstructure and composition of samples, and the results showed that CdS and Pt NPs were uniformly deposited on the surface of TiO2 nanotub...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2014