催化学报 ›› 2018, Vol. 39 ›› Issue (4): 736-746.DOI: 10.1016/S1872-2067(18)63039-6

• 论文 • 上一篇    下一篇

蛋氨酸改性TiO2空心纳米盒高效可见光催化RhB分解和NO氧化

赵轩a, 杜艳婷a, 张成江a, 田丽君a, 黎小芳a,b, 邓克俭a, 陈连清a, 段有雨a, 吕康乐a   

  1. a 中南民族大学催化材料科学国家民委-教育部重点实验室, 湖北武汉 430074;
    b 武汉科技大学化学化工学院, 湖北武汉 430081
  • 收稿日期:2017-12-07 修回日期:2018-01-15 出版日期:2018-04-18 发布日期:2018-04-08
  • 通讯作者: 陈连清, 吕康乐
  • 基金资助:

    国家自然科学基金(31402137,51672312,21373275);湖北省杰出青年基金(2013CFA034);湖北省英才计划(RCJH15001);武汉市科技计划(2016010101010018);中南民族大学中央高校基本科研业务费专项资金(CZP17077,CZP18016).

Enhanced visible photocatalytic activity of TiO2 hollow boxes modified by methionine for RhB degradation and NO oxidation

Xuan Zhaoa, Yanting Dua, Chengjiang Zhanga, Lijun Tiana, Xiaofang Lia,b, Kejian Denga, Lianqing Chena, Youyu Duana, Kangle Lva   

  1. a Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, South-Central University for Nationalities, Wuhan 430074, Hubei, China;
    b College of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China
  • Received:2017-12-07 Revised:2018-01-15 Online:2018-04-18 Published:2018-04-08
  • Contact: 10.1016/S1872-2067(18)63039-6
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (31402137, 51672312, 21373275), Hubei Province Science Fund for Distinguished Yong Scholars (2013CFA034), the Program for Excellent Talents in Hubei Province (RCJH15001), the Science and Technology Program of Wuhan (2016010101010018), and the Fundamental Research Funds for the Central University, South-Central University for Nationalities (CZP17077, CZP18016).

摘要:

由高能面TiO2纳米片(TiO2-NSs)组装成的TiO2空心纳米盒(TiO2-HNBs)显示出比单独TiO2-NSs更强的光催化性能,但是TiO2-HNBs依然属于紫外光催化剂,无法充分利用太阳能.因此,开发具有可见光响应的由高能面TiO2-NSs组装而成的TiO2-HNBs具有重要意义.本文将立方体TiOF2与含有N和S元素的生物分子蛋氨酸混合,通过一步焙烧制备了具有可见光响应活性的N和S元素共掺杂的TiO2-HNBs(掺杂催化剂标记为TMx,未掺杂催化剂标记为Txx代表焙烧温度).
由立方体TiOF2到锐钛矿相TiO2空心纳米盒的转变是一个自模板转化过程.氟离子的存在降低了TiO2高能面(001)面的表面能,从而使得高能面TiO2纳米片的形成变得可能.因此,热处理立方体TiOF2可得到由高能面TiO2纳米片组装的TiO2空心纳米盒.
本文系统研究了焙烧温度(300-500℃)对所制TiO2-HNBs结构与光催化性能的影响.结果发现,在350℃下焙烧,TiOF2完全转化成锐钛矿相TiO2-HNBs.但是焙烧蛋氨酸与TiOF2的混合物,需400℃才能完全实现TiOF2到锐钛矿相TiO2-HNBs的转变.这说明蛋氨酸的加入阻碍了TiOF2向锐钛矿相TiO2-HNBs的转变.XPS结果显示,经过400℃焙烧的蛋氨酸改性样品(TM400),N和S元素成功掺入了TiO2-HNBs晶格,使其产生可见光催化活性.
相对于400℃焙烧TiOF2所得样品T400,蛋氨酸改性的TM400催化剂可见光降解罗丹明B染料(RhB)和NO氧化的性能分别提升了1.55倍和2.0倍,这与其更强的可见光吸收性能和光生载流子分离效率有关.400℃焙烧的蛋氨酸改性的TM400可见光催化活性稳定,连续5次可见光催化RhB降解后,其活性没有明显改变,显示了潜在的应用前景.

关键词: TiO2空心纳米盒, TiOF2, 光催化降解, 罗丹明B, 一氧化氮氧化

Abstract:

Hierarchical TiO2 hollow nanoboxes (TiO2-HNBs) assembled from TiO2 nanosheets (TiO2-NSs) show improved photoreactivity when compared with the building blocks of discrete TiO2-NSs. However, TiO2-HNBs can only be excited by ultraviolet light. In this paper, visible-light-responsive N and S co-doped TiO2-HNBs were prepared by calcining the mixture of cubic TiOF2 and methionine (C5H11NO2S), a N-and S-containing biomacromolecule. The effect of calcination temperature on the structure and performance of the TiO2-HNBs was systematically studied. It was found that methionine can prevent TiOF2-to-anatase TiO2 phase transformation. Both N and S elements are doped into the lattice of TiO2-HNBs when the mixture of TiOF2 and methionine undergoes calcination at 400℃, which is responsible for the visible-light response. When compared with that of pure 400℃-calcined TiO2-HNBs (T400), the photoreactivity of 400℃-calcined methionine-modified TiO2-HNBs (TM400) improves 1.53 times in photocatalytic degradation of rhodamine-B dye under visible irradiation (λ > 420 nm). The enhanced visible photoreactivity of methionine-modified TiO2-HNBs is also confirmed by photocatalytic oxidation of NO. The successful doping of N and S elements into the lattice of TiO2-HNBs, resulting in the improved light-harvesting ability and efficient separation of photo-generated electron-hole pairs, is responsible for the enhanced visible photocatalytic activity of methionine-modified TiO2-HNBs. The photoreactivity of methionine modified TiO2-HNBs remains nearly unchanged even after being recycled five times, indicating its promising use in practical applications.

Key words: TiO2 hollow nanoboxes, TiOF2, Photocatalytic degradation, Rhodamine B, NO oxidation