A facile one-step synthesis of TiO2/graphene composites for photodegradation of methyl orange
A facile one-step synthesis of TiO2/graphene composites for photodegradation of methyl orange
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DOI：
10.1007/s12274-010-0079-4
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发表时间：
2011-03
期刊：
影响因子：
9.9
通讯作者：
Haijiao Zhang;Panpan Xu;G. Du;Zhiwen Chen;Kokyo Oh;Dengyu Pan;Z. Jiao
中科院分区：
文献类型：
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作者：
Haijiao Zhang;Panpan Xu;G. Du;Zhiwen Chen;Kokyo Oh;Dengyu Pan;Z. Jiao
以四氟化钛和电子束辐照处理的石墨烯为原料，采用简单的液相沉积法制备了二氧化钛/石墨烯复合光催化剂。用X-射线衍射仪、透射电子显微镜、X-射线光电子能谱和热重分析对产物进行了表征。考察了石墨烯含量、四氟化钛溶液浓度和辐照剂量等合成参数对合成的影响。结果表明，制备条件对最终产物的结构和性能有显著影响。辐照后的石墨烯表面覆盖有花瓣状的锐钛矿型二氧化钛纳米颗粒，其尺寸比未经电子束辐照处理的石墨烯更均匀、尺寸更小。以甲基橙的光催化降解为探针反应，评价了产物的光催化活性。结果表明，用电子束辐照处理的石墨烯合成的产物比未用电子束辐照处理的石墨烯合成的产物具有更高的光催化活性。
TiO2/graphene composite photocatalysts have been prepared by a simple liquid phase deposition method using titanium tetrafluoride and electron beam (EB) irradiation-pretreated graphene as the raw materials. The products were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The effects of varying the synthesis parameters such as graphene content, concentration of titanium tetrafluoride solution and irradiation dose were investigated. It was found that the preparation conditions had a significant effect on the structure and properties of the final products. The irradiated graphene was covered with petal-like anatase TiO2nanoparticles, which were more uniform and smaller in size than those in products synthesized without EB irradiation-pretreated graphene. The photocatalytic activities of the products were evaluated using the photocatalytic degradation of methyl orange as a probe reaction. The results showed that the products synthesized using EB irradiation-pretreated graphene exhibited higher photocatalytic activities than those using graphene without EB irradiation pretreatment.