化工进展 ›› 2019, Vol. 38 ›› Issue (06): 2870-2879.DOI: 10.16085/j.issn.1000-6613.2018-1866

• 材料科学与技术 • 上一篇    下一篇

氧化石墨烯-TiO2复合材料对三种染料的吸附动力学及光催化性能

张巧玲(),秦钊,刘有智,师艳婷,张竞文,曾广平   

  1. 中北大学超重力化工过程山西省重点实验室,山西 太原 030051
  • 收稿日期:2018-09-17 出版日期:2019-06-05 发布日期:2019-06-05
  • 作者简介:张巧玲(1965—),女,教授,硕士生导师,研究方向为二氧化钛的改性。E-mail:<email>zhangqiaoling@nuc.edu.cn</email>。

Adsorption kinetics and photocatalytic activity of grapheneoxide-TiO2 composites for three dyes

Qiaoling ZHANG(),Zhao QIN,Youzhi LIU,Yanting SHI,Jingwen ZHANG,Guangping ZENG   

  1. Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, Shanxi, China
  • Received:2018-09-17 Online:2019-06-05 Published:2019-06-05

摘要:

通过在氧化石墨烯分散溶液中水解钛酸丁酯成功制备氧化石墨烯-TiO2复合材料(GO-TiO2),采用傅里叶变换红外光谱(FTIR)、X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、全自动比表面及孔径分析仪(BET)和紫外-可见漫反射光谱(UV-vis DRS)等对样品进行了表征。研究了GO10-TiO2对亚甲基蓝(MB)、甲基橙(MO)和罗丹明B(RhB)3种染料的吸附动力学和光催化性能。结果表明:TiO2颗粒均匀地附着在GO片层表面;GO10-TiO2对3种染料的吸附过程为多层吸附,吸附动力学符合拟二级动力学模型;在25℃条件下GO10-TiO2对废水中MB、MO和Rh B的吸附因共轭结构、极性等的差异而呈现选择性吸附,吸附容量分别为9.2mg/g、5.4mg/g和23.0mg/g。对3种染料废水的光催化降解效果与吸附性能相关联,吸附容量越大降解效率越高,光催化反应60min时,MB、MO和Rh B降解率分别为89%、75%和98%。

关键词: 氧化石墨烯, 二氧化钛, 等温吸附曲线, 吸附动力学, 光催化反应

Abstract:

The titania-loaded graphene oxide composites (GO-TiO2) were prepared by hydrolysis of butyl titanate in graphene oxide dispersed solution. The modified samples were characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), automatic specific surface area and pore analysis (BET), and UV-vis diffuse spectroscopy (UV-vis DRS). The adsorption kinetics and photocatalytic properties of GO10-TiO2 for methylene blue (MB), methyl orange (MO) and Rhodamine B (Rh B) dyes were studied. The results showed that the TiO2 particles were uniformly attached to the surface of GO sheet, the adsorption process of GO10-TiO2 for three dyes was multi-layer adsorption, and the adsorption kinetics accords with the pseudo-second-order kinetic model. At 25℃, the adsorption of MB, MO and Rh B in wastewater by GO10-TiO2 showed selective adsorption due to the difference of conjugate structure and polarity with adsorption capacities of 9.2mg/g, 5.4mg/g and 23.0mg/g, respectively. The photocatalytic degradation of the three dye wastewaters was related to the adsorption performance. The higher the adsorption capacity, the higher the degradation efficiency. The degradation rates of MB, MO and Rh B were 89%, 75% and 98%, respectively, after photocatalytic reaction for 60min.

Key words: graphene oxide, titanium dioxide, isothermal adsorption curve, adsorption kinetics, photocatalytic reaction

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