| 单分散g-C3N4量子点修饰一维棒状BiPO4微晶的合成及其对光催化活性增强机理 |
| Synthesis of Monodispersed g-C3N4 Quantum Dots (QDs) Decorated on the Surface of 1D Rod-like BiPO4 with Enhanced Photocatalytic Activities |
| 作者 | 单位 | E-mail | | 王丹军 | 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000 | wangdj761118@163.com | | 申会东 | 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000 | | | 郭莉 | 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000
陕西师范大学材料科学与工程技术学院, 西安 716000 | | | 岳林林 | 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000 | | | 付峰 | 延安大学化学与化工学院, 陕西省化学反应工程重点实验室, 延安 716000 | |
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| 摘要: 利用水热法合成了一维棒状BiPO4微晶，在此基础上采用浸渍-焙烧法进行g-C3N4量子点表面修饰获得新颖的g-C3N4/BiPO4异质结。借助X射线衍射（XRD）、场发射扫描电镜（FE-SEM）、透射电镜（HRTEM）、能谱（EDS）、紫外-可见漫反射（UV-Vis-DRS）等测试手段对所得样品的相组成、形貌和谱学特征进行了表征。选择罗丹明B（RhB）和苯酚作为模型污染物研究了所得在可见光下的催化活性。结果表明，样品16%（w/w） g-C3N4/BiPO4对RhB降解的速率常数分别是纯g-C3N4和BiPO4的4.6倍和15倍。g-C3N4量子点与BiPO4之间形成异质结，抑制了光生电子-空穴对的复合，从而提高了催化剂的活性。自由基捕获实验进一步表明，超氧负离子自由基（·O2-）是催化降解RhB和苯酚的主要活性物种。 |
| 关键词: 一维棒状BiPO4微晶 g-C3N4量子点 表面修饰 活性增强机理 |
| 基金项目: 国家自然科学基金（No.21373159）、陕西省科技项目（No.2013K11-08，2013SZS20-P01，2015YG174）、陕西省教育厅科研基金项目（No.15JS119）、延安大学基金（No.2013YDZ-07，YDBK2013-11）和延安大学研究生科研创新项目（No.YCX201602）资助项目。 |
| Abstract: 1D rod-like BiPO4 have been successfully synthesized via a hydrothermal process, and g-C3N4 quantum dots(QDs) was decorated on the surface of BiPO4 to form a novel g-C3N4/BiPO4 heterojunction via a followed impregnation-calcinations method. XRD, FE-SEM, HR-TEM, EDS and UV-Vis-DRS techniques were employed to characterize the phase composition, morphology and spectrum properties of as-synthesized samples. The photocatalytic activities of samples were evaluated by degradation of RhB and phenol under visible light irradiation. The results also shows that 16%(w/w) g-C3N4/BiPO4 photocatalysts possesses the maximal k value of 0.348 min-1, which is 15 and 4.6 times higher than that of pure BiPO4 and g-C3N4, respectively. The catalytic efficiency enhancement of g-C3N4/BiPO4 heterojunctions relative to pure-BiPO4 can be attributed to the formation of heterojunctions between g-C3N4 QDs and BiPO4, which suppresses the recombination of photogenerated electron-holes. The radical scavengers test further confirmed that ·O2- was the main reactive species during the photocatalytic process. Therefore, this work provides a facile process for the design of novel and efficient BiPO4-based photocatalyst with multi-components. |
| Keywords: rod-like BiPO4 microcrystal g-C3N4 quantum dots (QDs) decoration photocatlaytic activity enhancement mechanism |
| 投稿时间：2016-01-02 修订日期：2016-05-23 |
| 摘要点击次数: 2040 |
| 全文下载次数: 1912 |
| 王丹军,申会东,郭莉,岳林林,付峰.单分散g-C3N4量子点修饰一维棒状BiPO4微晶的合成及其对光催化活性增强机理[J].无机化学学报,2016,32(7):1246-1254. |
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