Institute of Nanoscience and Nanotechnology, University of Kashan, 87317-51167 Kashan, Iran.
Nanotechnology. 2019 Dec 13;30(50):505702. doi: 10.1088/1361-6528/ab40dc. Epub 2019 Sep 3.
In this paper, we report on the preparation of S, N co-doped carbon quantum dots (CQDs)/TiO nanocomposite using a hydrothermal process where S, N-CQDs were concurrently synthesized and anchored to the surface of the TiO. The prepared nanocomposite was carefully characterized to identify the morphology and structure, crystallinity, chemical composition and optical properties. The photocatalytic activity of the nanocomposite was investigated for degradation of acid red 88 (AR88) under visible light irradiation. The capability of the S, N-CQDs/TiO nanocomposite to remove AR88 (77.29%) was higher than that of pure TiO (23.7%). In order to determine the influencing factors on the photocatalytic activity of the prepared nanocomposite, we studied various contents of the photocatalyst, the effect of pH and the content of HO Further investigations were conducted to reveal the mechanism of photocatalytic degradation using radical scavenging agents. The stability and reusability of the S, N-CQDs/TiO photocatalyst was tested in four reaction cycles (870 min) which showed a 25% loss of photoactivity after the fourth photocatalytic reaction.
本文采用水热法制备了 S、N 共掺杂碳量子点(CQDs)/TiO 纳米复合材料，在该过程中同时合成并将 S、N-CQDs 锚定在 TiO 的表面。对所制备的纳米复合材料进行了仔细的表征，以确定其形貌和结构、结晶度、化学成分和光学性质。研究了纳米复合材料在可见光照射下对酸性红 88(AR88)的光催化降解性能。S、N-CQDs/TiO 纳米复合材料去除 AR88 的能力(77.29%)高于纯 TiO(23.7%)。为了确定影响所制备纳米复合材料光催化活性的因素，我们研究了不同含量的光催化剂、pH 值的影响和 HO 的含量。进一步的研究是使用自由基清除剂来揭示光催化降解的机制。在四个反应循环(870 分钟)中测试了 S、N-CQDs/TiO 光催化剂的稳定性和可重复使用性，在第四次光催化反应后，光活性损失了 25%。
