Pt负载型二氧化钛纳米管/纳米晶复合光催化剂的制备及其光催化性能

doi:10.3724/SP.J.1077.2011.00747

无机材料学报 ›› 2011, Vol. 26 ›› Issue (7): 747-752.DOI: 10.3724/SP.J.1077.2011.00747

Pt负载型二氧化钛纳米管/纳米晶复合光催化剂的制备及其光催化性能

余威威¹, 张青红¹, 石国英², 李耀刚¹, 王宏志¹

(东华大学1. 纤维改性国家重点实验室; 2. 化学工程与生物工程学院, 上海 201620)

收稿日期:2010-09-26 修回日期:2010-11-10 出版日期:2011-07-20 网络出版日期:2011-06-20
作者简介:余威威(1986-), 女, 硕士研究生. E-mail: stereotype@126.com
基金资助:
国家自然科学基金(50772127); 教育部科技创新工程重大项目培育基金(708039); 中央高校基本科研业务费专项基金(10D10607)

Preparation of Pt-loaded TiO₂ Nanotubes/Nanocrystals Composite Photocatalysts and Their Photocatalytic Properties

YU Wei-Wei¹, ZHANG Qing-Hong¹, SHI Guo-Ying², LI Yao-Gang¹, WANG Hong-Zhi¹

(1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, China; 2. College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China)

Received:2010-09-26 Revised:2010-11-10 Published:2011-07-20 Online:2011-06-20
Supported by:
National Natural Science Foundation of China (50772127); Cultivation Fund of the Key Scientific and Technical Innovation Project, Ministry of Education of China (708039); Fundamental Research Funds for the Central Universities (10D10607)

摘要/Abstract

摘要： 结合强吸附能力与高光催化活性的催化剂有望更有效地除去废水中的污染物. 以Degussa P25二氧化钛为原料, 采用水热法制备了二氧化钛纳米管(简称为TNTs), 将TNTs加入到溶有氯铂酸和柠檬酸(还原剂)的无水乙醇中, 在蒸汽相水解装置中通过一步法制备了Pt负载型二氧化钛纳米管/纳米晶复合光催化剂. 蒸汽相处理过程中, 部分纳米管转变为锐钛矿相TiO₂, 仍有部分以管的形式存在, 使纳米复合物保留了较高的吸附能力. 利用X射线衍射(XRD)、透射电子显微镜(TEM)、比表面及孔隙度分析仪等方法对产物进行了表征. 结果表明, 粒径约为4 nm的金属性Pt较好地分散在TNTs及由纳米管转变而来、晶粒尺寸约为8 nm的锐钛矿相TiO₂晶粒表面, 复合物保留了高于216 m²/g的比表面积. 光催化降解染料酸性红及亚甲基蓝的实验结果表明, 纯管有较好的吸附能力, 但是光催化性能非常低, 经120℃蒸气处理并负载贵金属Pt后光催化活性有了显著的提高.

关键词: 纳米管, 蒸汽相水解, 二氧化钛, 锐钛矿相, Pt, 光催化

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 chloroplatinic 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 composite 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.

Key words: nanotubes, vapor phase hydrolysis, TiO2, anatase, platinum, photocatalysis

中图分类号:

TB321

余威威, 张青红, 石国英, 李耀刚, 王宏志. Pt负载型二氧化钛纳米管/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.

YU Wei-Wei, ZHANG Qing-Hong, SHI Guo-Ying, LI Yao-Gang, WANG Hong-Zhi. Preparation of Pt-loaded TiO₂ Nanotubes/Nanocrystals Composite Photocatalysts and Their Photocatalytic Properties[J]. Journal of Inorganic Materials, 2011, 26(7): 747-752.

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Pt负载型二氧化钛纳米管/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

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Pt负载型二氧化钛纳米管/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

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Preparation of Pt-loaded TiO₂ Nanotubes/Nanocrystals Composite Photocatalysts and Their Photocatalytic Properties