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首页> 外文期刊>RSC Advances >Fabrication of a novel BiOI/KTaO3 p–n heterostructure with enhanced photocatalytic performance under visible-light irradiation
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Fabrication of a novel BiOI/KTaO3 p–n heterostructure with enhanced photocatalytic performance under visible-light irradiation

机译：在可见光照射下具有增强的光催化性能的新型生物/ KtaO3 P-N异质结构

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In this study, a series of BiOI/KTaO _(3) p–n heterojunctions were prepared via a facile in situ 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 _(3) composites exhibited improved photocatalytic efficiency compared to the individual catalysts. In particular, 54 wt% BiOI/KTaO _(3) 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 _(3) was approximately 2.56 and 115-fold larger than those of pure BiOI and KTaO _(3,) 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 _(3) , which was conducive to the separation and migration of photo-generated carriers. Furthermore, a free-radical capture experiment illustrated that h ~(+) and ˙O _(2) ~(?) were the key factors in the photodegradation of RhB.
机译：在本研究中，通过原位化学浴策略的舒适性制备了一系列生物/ ktaO_（3）p-n异质结。通过在可见光照射下的罗丹明B（RHB）和苯酚的降解测试催化剂的光催化性质。与个体催化剂相比，BioI / KtaO _（3）复合材料表现出改善的光催化效率。特别地，54wt％的生物/ ktaO_（3）显示出最高的光催化活性，因为它在30分钟内降解了98.6％的RHB，而在相同的条件下仅在纯BIOI下降解了68.1％的RHB。此外，RHB降解的反应动力学常数超过54wt％BioI / KtaO _（3）分别比纯BioI和KtaO_（3）的大约为2.56和115倍。 PL，光电流和EIS的结果表明，改善的光催化效率可以在BioI和KtaO _（3）之间形成的p-n结中，这有利于光产生的载体的分离和迁移。此外，采用自由基捕获实验说明了H〜（+）和˙O_（2）〜（2）〜（？）是rhB光降解的关键因素。

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