Au改性BaTiO<sub>3</sub>纳米颗粒在模拟太阳光照射下的光催化降解性能

doi:10.11901/1005.3093.2016.222

材料研究学报

2017, Vol. 31

Issue (2): 102-109 DOI: 10.11901/1005.3093.2016.222

本期目录 | 过刊浏览

Au改性BaTiO₃纳米颗粒在模拟太阳光照射下的光催化降解性能

县涛¹(

),邸丽景^1,²,马俊¹,桑萃萃¹,魏学刚¹,周永杰¹

1 青海师范大学物理系西宁 810008
2 兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室兰州 730050

Photocatalytic Degradation Activity of BaTiO₃ Nanoparticles Modified with Au in Simulated Sunlight

Tao XIAN¹(

),Lijing DI^1,²,Jun MA¹,Cuicui SANG¹,Xuegang WEI¹,Yongjie ZHOU¹

1 Department of Physics, Qinghai Normal University, Xining 810008,China
2 State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

引用本文:

县涛,邸丽景,马俊,桑萃萃,魏学刚,周永杰. Au改性BaTiO₃纳米颗粒在模拟太阳光照射下的光催化降解性能[J]. 材料研究学报, 2017, 31(2): 102-109.
Tao XIAN, Lijing DI, Jun MA, Cuicui SANG, Xuegang WEI, Yongjie ZHOU. Photocatalytic Degradation Activity of BaTiO₃ Nanoparticles Modified with Au in Simulated Sunlight[J]. Chinese Journal of Materials Research, 2017, 31(2): 102-109.

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摘要:

用聚丙烯酰胺凝胶法制备BaTiO₃纳米颗粒,然后用光还原法在其表面沉积Au颗粒,制备出Au/BaTiO₃复合光催化剂。使用X射线粉末衍射技术(XRD)、透射电子显微镜(TEM)、紫外-可见光漫反射光谱(UV-Vis DRS)和荧光光谱(PL)等手段对样品进行了表征。结果表明：Au修饰没有改变BaTiO₃的晶体结构;粒径分布在5~20 nm的Au纳米颗粒,附着在BaTiO₃颗粒表面(平均粒径约为55 nm);Au纳米颗粒的表面等离子体共振吸收效应(SPR)使Au/BaTiO₃对~560 nm处的可见光产生较强的吸收;与BaTiO₃单体相比,Au/BaTiO₃中光生电子和空穴的复合几率明显降低。同时,提出了Au纳米颗粒在BaTiO₃表面的形成机制。以偶氮染料亚甲基蓝(MB)作为目标降解物,在模拟太阳光的照射下研究了产物的光催化活性和光催化稳定性。结果表明：适量的Au修饰明显提高了BaTiO₃的光催化降解活性,且使Au/BaTiO₃具有良好的光催化稳定性。探讨了Au纳米颗粒改善BaTiO₃模拟太阳光光催化性能的机理。

关键词 ：光催化, BaTiO3, 纳米颗粒, Au, 改性

Abstract：

BaTiO₃ nanoparticles were fabricated by gel method with polyacrylamide as raw material, and then Au nanoparticles were deposited on the surface of BaTiO₃ via a photocatalytic reduction method to yield Au/BaTiO₃ composite photocatalysts. The composite photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS) and photoluminescence (PL) spectroscopy. The results show that the BaTiO₃ particles undergo no structural change after the deposition of gold; The Au particles with size of 5-20 nm were deposited on the surface of BaTiO₃ particles with an average size of ~55 nm; The composites present light absorbance centered around 560 nm due to the surface plasmon resonance (SPR) effect of Au nanoparticles; The Au/BaTiO₃ composites exhibit a reduction in recombination probability of photo-generated electrons and holes compared to bare BaTiO₃. In addition, the formation mechanism for Au nanoparticles on the surface of BaTiO₃particles is proposed. The photocatalytic activity of the as-prepared composite photocatalyst was evaluated by the degradation of methylene blue (MB) under simulated sunlight irradiation, and the photocatalytic stability of the composites was also investigated. The results reveal that the photocatalytic activity of BaTiO₃can be improved by the deposition of appropriate amount of gold, and moreover the composite photocatalyst exhibits good reusability. Finally, the promotion mechanism of Au particles on the simulated sunlight photocatalytic activity of BaTiO₃ is also discussed.

Key words： photocatalysis BaTiO3 nanoparticles Au modification

收稿日期: 2016-04-22

基金资助:国家自然科学基金(51602170, 11164022), 教育部“春晖计划”合作科研项目(Z2015046),青海省自然科学基金青年项目(2016-ZJ-954Q),青海师范大学中青年科研基金

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.222 或 https://www.cjmr.org/CN/Y2017/V31/I2/102

图1 BaTiO3和0.9Au/BaTiO3样品的XRD图谱以及BaTiO3的标准XRD衍射图谱

图2 BaTiO3和Au/BaTiO3样品的TEM照片和EDX能谱图

图3 Au/BaTiO3的形成机理示意图

图4 BaTiO3和Au/BaTiO3样品的紫外-可见光漫反射光谱以及相应的一阶微分漫反射光谱

图5 BaTiO3和0.9Au/BaTiO3样品的PL光谱

图6 BaTiO3和Au/BaTiO3样品对MB的吸附率、模拟太阳光和可见光光催化降解活性

图7 0.9Au/BaTiO3光催化降解MB的循环实验

图8 Au纳米颗粒改善BaTiO3模拟太阳光光催化性能的机理示意图

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