Background

In recently years, the organic pollutants removal using semiconductor photocatalysis has attracted significant interest, however, the insufficient visible-light-harvesting ability and fast photogenerated charge recombination of photocatalysts vastly hinder their practical application.

Methods

In this work, a facile hydrothermal method was developed for the preparation of Ni doped ultrathin-layered and porous Bi₂O₂CO₃, thus the enhanced light absorption and charge separation were simultaneously achieved.

Significant Findings

The experimental and characterization results show that the formation of ultrathin porous structure can promote multiple scattering of the light, thus enhancing light absorption. Moreover, the adjustment of electronic structure enhances the charge transfer rate greatly and suppresses the recombination of charge carriers. Consequently, the rhodamine B (RhB) photodegradation efficiency of Ni-Bi₂O₂CO₃ has an obvious improvement, which is 8.94-fold higher than pristine Bi₂O₂CO₃. And the primary active species are ·O₂⁻ and ·OH radicals in the photocatalytic reaction. Moreover, the degradation pathway of RhB is studied by LC-MS technology and a probable degradation pathway is presented. This work offers an efficacious strategy for synergistically modulating and optimizing photocatalysts and provides an efficient photocatalyst for wastewater treatment.

中文翻译：

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Ni掺杂制备超薄多孔表面改性Bi2O2CO3纳米片光催化降解有机污染物

背景

近年来，利用半导体光催化去除有机污染物引起了人们极大的兴趣，然而，光催化剂的可见光捕获能力不足和光生电荷复合速度快，极大地阻碍了其实际应用。

方法

在这项工作中，开发了一种简便的水热法制备Ni掺杂的超薄层状多孔Bi ₂ O ₂ CO ₃，从而同时实现了增强的光吸收和电荷分离。

重要发现

实验和表征结果表明，超薄多孔结构的形成可以促进光的多次散射，从而增强光吸收。此外，电子结构的调整大大提高了电荷转移率，抑制了载流子的复合。因此，Ni-Bi ₂ O ₂ CO ₃的罗丹明B（RhB）光降解效率有明显提高，比原始Bi ₂ O ₂ CO ₃高8.94倍。主要活性物质是·O ₂ ^-和·OH自由基在光催化反应中。此外，通过LC-MS技术研究了RhB的降解途径，并提出了可能的降解途径。这项工作为协同调节和优化光催化剂提供了一种有效的策略，并为废水处理提供了一种有效的光催化剂。