Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea.
Environ Sci Pollut Res Int. 2019 Jan;26(2):1072-1081. doi: 10.1007/s11356-017-8571-y. Epub 2017 Feb 11.
The electrochemical anodization method was used to dope graphite oxide (GO) onto TiO nanotubes (TNTs). This study focused on enhancement of the photocatalytic activity of TNTs in the visible light region. In this study, we have checked the effect of different GO concentrations and effect of GO doping time on photocatalytic efficiency of composite. The photocatalytic activity of the GO-TNT composite was tested by degradation of an organic compound. The organic compound was most severely degraded (95%) when the GO-TNT catalyst was doped at an anodization of 60 V for 13 min and GO concentration of 0.25 g L. This degradation was 5.6 times higher than that of bare TiO. The as-prepared catalyst was characterized using FE-SEM, XRD, AES, PL, UV-Vis DRS, and Raman analysis. Recycling of the GO-TNT composite was also performed in order to examine the stability of the visible light catalyst. We observed that the doping of GO on the TNT surface can enhance the photocatalytic efficiency under visible light. Graphene acts as an electron transport; therefore, GO-TNTs were favorable for the separation of e and h charges. This promoted the formation of OH radicals, h, and superoxides, all of which degrade organics.
采用电化学阳极氧化法将石墨氧化物 (GO) 掺杂到 TiO2 纳米管 (TNT) 中。本研究重点研究了可见光区域内 TNTs 光催化活性的增强。在这项研究中，我们检查了不同 GO 浓度和 GO 掺杂时间对复合材料光催化效率的影响。通过降解有机化合物来测试 GO-TNT 复合材料的光催化活性。当 GO-TNT 催化剂在 60 V 下阳极氧化 13 分钟并且 GO 浓度为 0.25 g/L 时，GO-TNT 催化剂的降解率最高（95%）。这一降解速度比纯 TiO2 高 5.6 倍。采用 FE-SEM、XRD、AES、PL、UV-Vis DRS 和拉曼分析对所制备的催化剂进行了表征。为了考察可见光催化剂的稳定性，还对 GO-TNT 复合材料进行了回收利用。我们观察到，在 TNT 表面掺杂 GO 可以增强可见光下的光催化效率。石墨烯作为电子传输体；因此，GO-TNTs 有利于 e 和 h 电荷的分离。这促进了 OH 自由基、h 和超氧化物的形成，所有这些都可以降解有机物。
