Nanoscale p-n heterojunctions of BiOI/nitrogen-doped reduced graphene oxide as a high performance photocatalyst
Nanoscale p-n heterojunctions of BiOI/nitrogen-doped reduced graphene oxide as a high performance photocatalyst
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BiOI/氮掺杂还原氧化石墨烯纳米级p-n异质结作为高性能光催化剂
DOI：
10.1016/j.carbon.2018.02.038
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发表时间：
2018-06
期刊：
影响因子：
10.9
通讯作者：
Zhizhen Ye
中科院分区：
文献类型：
--
作者：
Bin Lu;Sheng Zeng;Chenyang Li;Yinzhou Wang;Xinhua Pan;Li Zhang;Hongying Mao;Yunhao Lu;Zhizhen Ye
铋氧碘（BiOI）是一种新兴的用于水净化和污染处理的可见光催化剂。然而，光生电子-空穴对的寿命短，限制了裸BiOI的性能。在这里，氮掺杂的还原氧化石墨烯（rGO）薄片通过溶剂热反应自组装在BiOI纳米板的球形上层结构上。产物是具有高效可见光催化降解活性的纳米级p-BiOI/n-rGO异质结。负载n-rGO质量比为2.83%时，光催化效率最高，对苯酚的去除率提高了2.1倍，对罗丹明B的降解率提高了1.8倍。实验测量表明，p-BiOI/n-rGO光催化性能的增强归功于光催化中三个关键步骤的改进：电荷分离、迁移和重组，这得益于纳米级p-BiOI/n-rGO异质结的内置电场。我们的方法为高效可见光响应光催化剂提供了一种经济有效的解决方案。
Bismuth oxygen iodine (BiOI) is an emerging visible-light photocatalyst for water purification and contamination treatment. However, the performance of bare BiOI is restricted by the short lifetime of photogenerated electron-hole pairs. Herein, nitrogen-doped reduced graphene oxide (rGO) flakes self-assemble on the spherical superstructures of BiOI nanoplates via solvothermal reactions. The products are nanoscale p-BiOI/n-rGO heterojunctions with highly efficient visible light photocatalytic degradation activities. Optimum photocatalytic efficiency is obtained with ∼2.83% weight ratio of loaded n-rGO, and the activity increased by 2.1 times for removal of phenol and 1.8 times for degradation of rhodamine B over with bare BiOI. Experimental measurements demonstrate that the enhanced photocatalytic performance of p-BiOI/n-rGO is ascribed to the improvement in all three vital steps in photocatalysis: charge separation, migration, and recombination, which benefit from the built-in electric field of the nanoscale p-BiOI/n-rGO heterojunctions. Our method provides a cost-effective solution for high-efficiency visible-light-response photocatalyst.
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DOI：
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