Lu Xiaoxiao, Li Qiang, Liu Shihao, Luo Rui, Li Hong, Zhang Min, Cui Chaopeng, Zhu Guangping, Chen San, Liang Changhao
College of Physics and Electronic Information, Huaibei Normal University Huaibei 235000 P. R. China
Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Huaibei Normal University Huaibei 235000 P. R. China.
RSC Adv. 2020 Mar 17;10(18):10921-10931. doi: 10.1039/c9ra10231k. eCollection 2020 Mar 11.
In this study, a series of BiOI/KTaO p-n heterojunctions were prepared a facile chemical bath strategy. The photocatalytic properties of the catalysts was tested by the degradation of Rhodamine B (RhB) and phenol under visible light irradiation. The BiOI/KTaO composites exhibited improved photocatalytic efficiency compared to the individual catalysts. In particular, 54 wt% BiOI/KTaO displayed the highest photocatalytic activity since it degraded 98.6% RhB within 30 minutes, while only 68.1% RhB was degraded over pure BiOI under identical conditions. In addition, the reaction kinetic constant of RhB degradation over 54 wt% BiOI/KTaO was approximately 2.56 and 115-fold larger than those of pure BiOI and KTaO respectively. The results of PL, photocurrent and EIS indicated that the improved photocatalytic efficiency could root in the p-n junction formed between BiOI and KTaO, which was conducive to the separation and migration of photo-generated carriers. Furthermore, a free-radical capture experiment illustrated that h and ˙O were the key factors in the photodegradation of RhB.
在本研究中，通过一种简便的化学浴策略制备了一系列BiOI/KTaO p-n异质结。通过在可见光照射下对罗丹明B（RhB）和苯酚的降解来测试催化剂的光催化性能。与单独的催化剂相比，BiOI/KTaO复合材料表现出更高的光催化效率。特别是，54 wt%的BiOI/KTaO表现出最高的光催化活性，因为它在30分钟内降解了98.6%的RhB，而在相同条件下，纯BiOI仅降解了68.1%的RhB。此外，54 wt%的BiOI/KTaO上RhB降解的反应动力学常数分别比纯BiOI和KTaO的大约大2.56倍和115倍。PL、光电流和EIS结果表明，光催化效率的提高可能源于BiOI和KTaO之间形成的p-n结，这有利于光生载流子的分离和迁移。此外，自由基捕获实验表明，h和˙O是RhB光降解的关键因素。
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