无机材料学报2011，Vol.26Issue(7)：747-752,6.DOI:10.3724/SP.J.1077.2011.00747
Pt负载型二氧化钦纳米管/纳米晶复合光催化剂的制备及其光催化性能
Preparation of Pt-loaded TiO2 Nanotubes/Nanocrystals Composite Photocatalysts and Their Photocatalytic Properties
摘要
Abstract
The composite photocatalysts combining high adsorptive capacity with enhanced photocatalytic efficiency are expected to be more efficient catalysts for the pollutant removal in the wastewater. TiO2 nanotubes (TNTs) were synthesized via hydrothermal method using Degussa P25 titania as raw material. The Pt-loaded TiO2 nanotubes/nanocrystals composite photocatalysts (Pt/TNNs) were prepared via one-step synthesis method involved the vapor phase hydrolysis setup, where TNTs were added into the ethanol solution containing chloro-platinic acid and citric acid (as the reductant). During the water vapor treatment, some of the nanotubes were transformed into anatase TiO2 nanocrystals and a small amount of TNTs were kept as the tubular morphologies, thus the composite had a higher adsorptive capacity. The as-prepared samples were characterized by X-ray diffraction, transmission electron microscope and N2 isothermal adsorption-desorption. Results showed that the Pt nanoparticles with crystallite size of 4 nm were uniformly dispersed onto the surface of remaining TNTs and anatase TiO2 nanocrystals with crystallite size of 8 nm derived from the transformation of TNTs, and the com-posite photocatalysts kept a specific surface area of more than 216 m2/g. The photocatalytic activity of Pt/TNNs was evaluated by the degradation rate of acid red G (ARG) and methylene blue (MB) under UV irradiation. The results showed that the pristine TNTs had good adsorptive ability but very poor photocatalytic activity. After loading with Pt nanocrystals, Pt/TNNs obtained via water vapor treatment at 120℃ exhibited much higher photocatalytic efficiency compared with the pristine TNTs.关键词
纳米管/蒸汽相水解/二氧化钛/锐钛矿相/Pt/光催化Key words
nanotubes/ vapor phase hydrolysis/ TiO2/ anatase/ platinum/ photocatalysis引用本文复制引用
余威威,张青红,石国英,李耀刚,王宏志..Pt负载型二氧化钦纳米管/纳米晶复合光催化剂的制备及其光催化性能[J].无机材料学报,2011,26(7):747-752,6.基金项目
国家自然科孚基金(50772127) （50772127）
教育部科技创新工程重大项目培育基金(708039) （708039）
中央高校基本科研业务费专项基金(101310607) （101310607）
