| 曹亚亚,黄少斌,尹佳芝.不同煅烧温度制备的n-p型CeO2/BiOBr光催化性能研究[J].分子催化,2016,30(2):159-168 |
| 不同煅烧温度制备的n-p型CeO2/BiOBr光催化性能研究 |
| Study on the Photocatalytic Activities of n-p Type CeO2/BiOBr Composite Prepared at Different Calcination Temperatures |
| 投稿时间：2015-12-23 修订日期：2016-02-05 |
| DOI： |
| 中文关键词: CeO2/ BiOBr 异质结 煅烧温度 光催化 微乳法 |
| 英文关键词:CeO2/BiOBr n-p type heterojunction calcination temperature photocatalysis microemulsion method |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）；广东省科技计划项目粤港联合创新领域项目 |
|
| 摘要点击次数: 1194 |
| 全文下载次数: 2686 |
| 中文摘要: |
| 摘要：采用微乳法制备了n-p 型CeO2/BiOBr 异质结，其中十六烷基三甲基溴化铵(CTAB)既作为Br源，又作为“桥”使CTA 修饰在CeO2表面形成了稳定的油包水微乳体系. 利用XRD、SEM、HRTEM、UV-Vis DRS、BET、XPS等对样品进行结构、形貌和光学性质进行表征，并对复合光催化剂进行了可见光下降解甲基橙(MO)的光催化活性研究. 考察了不同煅烧温度对合成CeO2/BiOBr的影响. 结果表明: CeO2/BiOBr 异质结相比于单体CeO2和BiOBr来说，它的光响应范围大大增加，在可见光下降解MO具有更高的光催化活性. 450 oC下煅烧可使MO达到最佳的降解率，而高温则会使催化剂发生烧结. 机理研究表明，在CeO2与BiOBr复合体中，使有机物矿化的主要为CeO2价带上的光生空穴. CeO2/BiOBr催化活性增强主要是由于在CeO2与BiOBr之间形成了n-p型的异质结. |
| 英文摘要: |
| Abstract: N-p type CeO2/ BiOBr heterojunction was prepared using microemulsion method, in which cetyltrimethyl ammonium bromide (CTAB) acted not only as the Br source, but was able to link the cetyltrimethyl ammonium cation with CeO2 to form a water-in-oil microemulsion-like system. Several characterization tools including XRD, SEM , HRTEM, UV-Vis DRS, BET and XPS were employed to study the phase structures, morphologies and optical properties of the samples. Methyl orange (MO) solutions were used to degrade by the prepared composite photoCatalysts and evaluate the photoCatalytic activities under visible light irradiation. The results show that in compared to pure CeO2 and BiOBr, the heterojunction exhibits enhanced absorption response in visible light range and higher photoCatalytic performance for the degradation of MO. Calcination at 450 oC exhibits the optical degradation rate of MO under visible light irradiation, while high temperature can lead to sinter of photoCatalyst. The study on mechanism shows that the CeO2/BiOBr composite induces mineralization of organics by utilizing the holes generated in the VB of CeO2. The enhanced photoCatalytic performance is explained by the formation of the n-p type heterojunction between CeO2 and BiOBr. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
