高等学校化学学报

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聚苯胺纳米线/SnO2复合光催化材料的光化学制备与性能

孙丰强   

  1. 华南师范大学
  • 收稿日期:2020-08-17 修回日期:2020-11-09 出版日期:2020-11-13 发布日期:2020-11-13
  • 通讯作者: 孙丰强

Photochemical Fabrication and Performance of Polyaniline Nanowire/SnO2 Composite Photocatalyst

Feng-Qiang Sun   

  1. South China Normal University
  • Received:2020-08-17 Revised:2020-11-09 Online:2020-11-13 Published:2020-11-13
  • Contact: Feng-Qiang Sun

摘要: SnO2是一种常见的光催化剂,通过复合改性提高其光催化性能是促进其应用的有效手段。本文开展SnO2/聚合物复合光催化材料的研究,将具有确定形态的聚苯胺(PANI)纳米线作为复合单元,通过室温光化学法控制SnO2的形成并与之复合,以实现PANI对SnO2光催化活性的增强。直接将PANI纳米线分散在SnSO4和H2SO4的混合溶液中,通过紫外光照射获得PANI纳米线/SnO2纳米颗粒复合材料。对复合材料的形态和成分进行了分析,发现二者相互交织在一起,且部分颗粒直接生长在纳米线上。以罗丹明B溶液为目标降解污染物研究了复合材料在低功率紫外灯下的光催化活性,结果表明PANI纳米线可以明显增强SnO2的光催化活性,且增强效果与光照复合时间呈规律性变化,在最优复合时间下复合材料的光催化活性是纯SnO2的近3倍。通过对能级结构与光催化反应过程的测试分析,认为Z-型异质结的形成促进了光生电子-空穴的分离,进而增强了材料的光催化活性。以具有规则形态的聚合物纳米材料为组元后续光化学复合SnO2是一种新的复合方式,具有绿色、易于操作、廉价的特点,易于调控SnO2的光催化活性,能够促进SnO2在光催化领域的应用。

Abstract: SnO2 is a common photocatalyst, and improving its photocatalytic performance through composite modification is an effective means to promote its application. Herein, a study on SnO2/polymer composite photocatalytic materials was carried out. The polyaniline (PANI) nanowires with determined morphology were employed as composite units to control the formation and recombination of SnO2 by a room temperature photochemical method to achieve PANI enhanced photocatalytic activity. PANI nanowires were directly dispersed in a mixed solution of SnSO4 and H2SO4 to obtain PANI nanowire/ SnO2 nanoparticle composites by UV irradiation. The morphology and composition of the composites were analyzed, and it was found that the two components were interwoven and some particles grew directly on the nanowires. The photocatalytic activity of the composite under low power UV lamp was studied with rhodamine B solution as the target degradation pollutant. The results showed that PANI nanowires could obviously enhance the photocatalytic activity of the SnO2, and the enhancement effect changed regularly with the growth time of SnO2. The photocatalytic activity of the composite obtained in the optimal recombination time was nearly 3 times that of the pure SnO2. By measuring and analyzing on the energy level structure and the photocatalytic reaction process, it is considered that the formation of Z-Scheme heterojunction promotes the separation of photogenerated electrons-holes, and then enhances the photocatalytic activity of the material. The subsequent photochemical recombination SnO2 with polymer nanomaterials with regular morphology as components is a new recombination mode. It has the characteristics of green, easy to operate and cheap, easy to regulate SnO2 photocatalytic activity, and can promote SnO2 application in the field of photocatalysis.