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Coupling morphology control and surface I grafting for boosting the photocatalytic activity of Bi2O2[BO2(OH)] nanosheets
Applied Surface Science ( IF 6.7 ) Pub Date : 2022-01-03 , DOI: 10.1016/j.apsusc.2021.152407
Shuguan Li 1 , Ning Ji 1 , Hongwei Huang 1
Affiliation  

Photocatalytic performance of semiconductors is currently limited by low solar light utilization, rapid charge recombination and limited reactive sites. Reducing the thickness of layered photocatalysts can shorten the charge transport distance to inhibit their recombination and provide more reactive sites. Surface ionic grafting can broaden the light absorption range and promote the separation efficiency of carriers. In this work, the surface iodine ion modified Bi2O2[BO2(OH)] nanosheets are synthesized by combining the surfactant-assisted hydrothermal method and room-temperature KI solution treatment route. These nanosheets show increased photoabsorption in visible region, enlarged specific surface area and promoted charge separation. Compared with the pristine Bi2O2[BO2(OH)], the surface I- modified Bi2O2[BO2(OH)] nanosheets exhibit substantially strengthened photocatalytic performance for degradation of BPA, which increases beyond 25 times. The total organic carbon content (TOC) test reveals that the mineralization process of BPA. Electron spin resonance (ESR) measurements disclose the radicals that play dominant role in the photocatalytic process and confirm their increased yield over I- modified Bi2O2[BO2(OH)] nanosheets. In addition, BiOB-S-I2 also shows universality for degradation of a variety of high-concentration pollutants, including rhodamine B, methyl orange, methylene blue, phenol, 2,4-dichlorophenol and tetracycline hydrochloride. This study may provide a combined strategy for exploring high-performance photocatalysts via microstructure control and surface ionic decoration.



中文翻译:

耦合形态控制和表面 I 接枝提高 Bi2O2[BO2(OH)] 纳米片的光催化活性

目前,半导体的光催化性能受到太阳光利用率低、电荷复合快速和反应位点有限的限制。减少层状光催化剂的厚度可以缩短电荷传输距离以抑制它们的复合并提供更多的反应位点。表面离子接枝可以拓宽光吸收范围,提高载体的分离效率。在这项工作中,表面碘离子改性的 Bi 2 O 2 [BO 2(OH)]纳米片是通过结合表面活性剂辅助水热法和室温KI溶液处理路线合成的。这些纳米片在可见光区域显示出增加的光吸收、扩大的比表面积和促进的电荷分离。与原始的Bi 2 O 2 [BO 2 (OH)]相比,表面I-改性的Bi 2 O 2 [ BO 2(OH)] 纳米片对 BPA 降解的光催化性能显着增强,提高了 25 倍以上。总有机碳含量(TOC)测试揭示了BPA的矿化过程。电子自旋共振 (ESR) 测量揭示了在光催化过程中起主导作用的自由基,并证实它们的产率高于 I -改性 Bi 2 O 2 [BO 2(OH)] 纳米片。此外,BiOB-S-I2还表现出对罗丹明B、甲基橙、亚甲蓝、苯酚、2,4-二氯苯酚、盐酸四环素等多种高浓度污染物的降解通用性。该研究可能为通过微观结构控制和表面离子修饰探索高性能光催化剂提供一种组合策略。

更新日期:2022-01-14
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