| 三维花状Bi2WO6/BiOBr异质结的制备及对多种染料的降解性能 |
| Three-Dimensional Flower-like Bi2WO6/BioBr Heterojunction: Preparation and Degradation Properties for Various Dyes |
| 作者 | 单位 | E-mail | | 赵琪 | 中国建筑材料科学研究总院有限公司, 绿色建筑材料国家重点实验室, 北京 100024 | | | 刘蕊蕊 | 中国建筑材料科学研究总院有限公司, 绿色建筑材料国家重点实验室, 北京 100024 | shanqingliuruirui@163.com | | 张琎珺 | 中国建筑材料科学研究总院有限公司, 绿色建筑材料国家重点实验室, 北京 100024 | | | 解帅 | 中国建筑材料科学研究总院有限公司, 绿色建筑材料国家重点实验室, 北京 100024 | | | 王静 | 中国建筑材料科学研究总院有限公司, 绿色建筑材料国家重点实验室, 北京 100024 | | | 曹延鑫 | 中国建筑材料科学研究总院有限公司, 绿色建筑材料国家重点实验室, 北京 100024 | | | 冀志江 | 中国建筑材料科学研究总院有限公司, 绿色建筑材料国家重点实验室, 北京 100024 | jzj1618@126.com |
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| 摘要: 利用水热法以十二烷基二甲基溴化铵（DDAB）和十六烷基三甲基溴化铵（CTAB）为结构导向剂以及溴源，成功地制备了三维花状Bi2WO6/BiOBr异质结。通过X射线粉末衍射、扫描电镜、透射电镜、紫外可见漫反射光谱、光电流、Nyquist曲线和电子顺磁共振分别对样品的结构、形貌、组成和光电化学性能进行了表征。结果表明，20~30 nm的BiOBr纳米粒子均匀地附着在Bi2WO6薄片上形成三维花状结构。Bi2WO6/BiOBr与纯Bi2WO6相比，扩展了可见光的响应范围，且提高了催化剂光生电子与空穴的分离效率。光降解实验表明wDDAB/wCTAB=2.6时Bi2WO6/BiOBr的光催化性能最优。在300 W氙灯（波长>420 nm）可见光照射下，其在降解罗丹明B中表现出最高的反应速率常数（0.099 7 min-1），分别约为Bi2WO6（0.037 6 min-1）和BT-4（0.052 3 min-1，wDDAB/wCTAB=3.9）的2.7倍和1.9倍，且6个循环后活性依然没有明显衰减。Bi2WO6/BiOBr异质结还可以无选择性地降解其他类型的有机染料，如亚甲基蓝、孔雀石绿和甲基橙。最后，基于活性物种捕获实验和Mulliken原子电负性理论计算结果，提出了Bi2WO6/BiOBr异质结的光降解机理。 |
| 关键词: Bi2WO6 BiOBr 异质结 染料 光催化 |
| 基金项目: “一带一路”共建国家绿色建筑技术和标准研发与应用（No.2020YFE0200300-08）和中国建筑材料科学研究总院有限公司（CBMA）前沿探索基金项目（ZA-7）资助 |
| Abstract: A three-dimensional flower-like Bi2WO6/BiOBr heterojunction was successfully prepared by a hydrothermal approach using didodecyldimethylammonium bromide (DDAB) and cetyltrimethylammonium bromide (CTAB) as structure-directing agents and Br sources. The as-prepared photocatalysts were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, UV-visible diffuse reflection spectroscopy, transient photocurrent, Nyquist plots, and electron paramagnetic resonance to investigate the structure, morphology, composition, and photoelectrochemical properties. The results showed that 20-30 nm BiOBr nanoparticles were uniformly attached to Bi2WO6 sheet to form a three-dimensional flower shape structure. Compared with pure Bi2WO6, Bi2WO6/BiOBr showed a wide visible response range and effective separation efficiency of photogenerated electrons and holes. The optimum photocatalytic performance of Bi2WO6/BiOBr when wDDAB/wCTAB=2.6 was verified by photodegradation experiments. Under the irradiation of a 300 W Xe lamp with 420 nm filter, it showed the highest reaction rate constant (0.099 7 min-1) in the degradation of rhodamine B, which was about 2.7 times and 1.9 times of Bi2WO6 (0.037 6 min-1) and BT-4 (0.052 3 min-1, wDDAB/wCTAB=3.9), respectively, and the activity was no significant decrease after 6 cycles. Bi2WO6/BiOBr heterojunction can also non-selectively degrade other types of organic dyes, such as methylene blue, malachite green, and methyl orange. Finally, the photodegradation mechanism of Bi2WO6/BiOBr heterojunctions was proposed by the active species capture experiment and Mulliken theoretical calculation of atomic electronegativity. |
| Keywords: Bi2WO6 BiOBr heterojunction dye photocatalysis |
| 投稿时间：2021-09-13 修订日期：2021-11-30 |
| 摘要点击次数: 1433 |
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| 赵琪,刘蕊蕊,张琎珺,解帅,王静,曹延鑫,冀志江.三维花状Bi2WO6/BiOBr异质结的制备及对多种染料的降解性能[J].无机化学学报,2022,38(2):321-332. |
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