Cr掺杂TiO2纳米线/还原氧化石墨烯复合物的制备及光催化活性

doi:10.7503/cjcu20160323

高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (10): 1833.doi: 10.7503/cjcu20160323

Cr掺杂TiO₂纳米线/还原氧化石墨烯复合物的制备及光催化活性

朱洁莲¹, 夏晓峰¹, 朱珊珊¹, 刘湘¹(), 李和兴²

1. 江南大学化学与材料工程学院, 食品胶体与生物技术教育部重点实验室, 无锡 214122
2. 上海师范大学资源化学教育部重点实验室, 上海 200234

收稿日期:2016-05-10 出版日期:2016-10-10 发布日期:2016-09-23
作者简介:联系人简介: 刘湘, 男, 副教授, 主要从事改性TiO₂/石墨烯复合物的制备及光催化性能研究. E-mail:liuxiang@jiangnan.edu.cn
基金资助:
国家自然科学基金(批准号: 21402066)资助

Synthesis and Photocatalytic Activity of Cr Doped TiO₂Nanowires/Reduced Graphene Oxide Composites^†

ZHU Jielian¹, XIA Xiaofeng¹, ZHU Shanshan¹, LIU Xiang^1,^*(), LI Hexing²

1. Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China
2. Key Laboratory of the Chinese Ministry of Education in Resource Chemistry, Shanghai Normal University, Shanghai 200234, China

Received:2016-05-10 Online:2016-10-10 Published:2016-09-23
Contact: LIU Xiang E-mail:liuxiang@jiangnan.edu.cn
Supported by:
† Supported by the National Natural Science Foundation of China(No.21402066)

摘要/Abstract

摘要：

以TiO₂纳米颗粒P25和氧化石墨烯(GO)为原料, Cr(NO₃)₃·9H₂O为Cr源, 采用碱性水热法制备了Cr掺杂TiO₂纳米线/还原氧化石墨烯复合物(Cr-TiO₂NWs/RGO). 采用类似方法合成了TiO₂纳米线(TiO₂NWs)、 Cr掺杂TiO₂纳米线(Cr-TiO₂NWs)和TiO₂纳米线/还原氧化石墨烯复合物(TiO₂NWs/RGO)等其它样品. 通过X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、拉曼(Raman)光谱、 X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和紫外-可见漫反射光谱(UV-Vis DRS)等方法对样品进行了表征. 测试了样品在可见光下对亚甲基蓝(MB)的降解活性, 结果表明, Cr-TiO₂NWs/RGO在120 min内对MB的催化降解率为TiO₂NWs的2.2倍, 催化降解速度为TiO₂NWs的5.8倍.

关键词: Cr掺杂TiO2, 石墨烯复合物, 光催化, 水热法

Abstract:

Cr-doped TiO₂ nanowires/reduced graphene oxide composites(Cr-TiO₂NWs/RGO) were synthesized via alkaline hydrothermal method, in which commercial TiO₂ nanoparticles(P25) and graphene oxide(GO) were used as the precursors while Cr(NO₃)₃·9H₂O was used as the Cr source. Other samples, such as TiO₂ nanowires(TiO₂NWs), were prepared via the similar method. The obtained samples were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), Raman spectroscopy, X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS). The photocatalytic activities of the samples were evaluated by measuring the photodegradation of methylene blue(MB) under visible light irradiation. The results showed that the degradation rate of MB catalyzed by Cr-TiO₂NWs/RGO was 2.2 times that catalyzed by TiO₂NWs within 120 min, and the degradation speed of MB catalyzed by Cr-TiO₂NWs/RGO is 5.8 times that catalyzed by TiO₂NWs.

Key words: Cr doped TiO2, Graphene composite, Photocatalysis, Hydrothermal method

中图分类号:

O643.3

TrendMD:

朱洁莲, 夏晓峰, 朱珊珊, 刘湘, 李和兴. Cr掺杂TiO₂纳米线/还原氧化石墨烯复合物的制备及光催化活性. 高等学校化学学报, 2016, 37(10): 1833.

ZHU Jielian, XIA Xiaofeng, ZHU Shanshan, LIU Xiang, LI Hexing. Synthesis and Photocatalytic Activity of Cr Doped TiO₂Nanowires/Reduced Graphene Oxide Composites^†. Chem. J. Chinese Universities, 2016, 37(10): 1833.

图/表 8

Fig.1 XRD patterns of TiO2NWs(a), Cr-TiO2NWs(b),TiO2NWs/RGO(c), Cr-TiO2NWs/RGO(d) and GO(e)

Fig.2 FTIR spectra of GO(a) and Cr-TiO2NWs/RGO(b)

Fig.3 Raman spectra of TiO2NWs(a), Cr-TiO2NWs(b), TiO2NWs/RGO(c), Cr-TiO2NWs/RGO(d) and GO(e)

Fig.4 Full XPS spectra of GO(A) and Cr-TiO2NWs/RGO(B), Cr XPS spectra of Cr-TiO2NWs/RGO(C), C1sXPS spectra of GO(D) and Cr-TiO2NWs/RGO(E), O1sXPS spectra of GO and Cr-TiO2NWs/RGO(F)

Fig.5 SEM(A, B) and TEM(C, D) images of Cr-TiO2NWs/RGO

Fig.6 UV-Vis DRS(A) and corresponding Tauc’s plots(B) of different photocatalystsa. TiO2NWs; b. Cr-TiO2NWs; c. TiO2NWs/RGO; d. Cr-TiO2NWs/RGO.

Fig.7 Adsorbing capacity(A), photodecomposition curves(B) and relationship between irradiation time and ln(c0/c)(C) of different catalysts for MBa. No catalysts; b. TiO2NWs; c. Cr-TiO2NWs; d. TiO2NWs/RGO; e. Cr-TiO2NWs/RGO.

Fig.8 Schematic illustration of photocatalytic enhancement mechanism of Cr-TiO2NWs/RGO

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Cr掺杂TiO₂纳米线/还原氧化石墨烯复合物的制备及光催化活性

Synthesis and Photocatalytic Activity of Cr Doped TiO₂Nanowires/Reduced Graphene Oxide Composites^†

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