Bren School of Environmental Science and Management, University of California, Santa Barbara, CA 93106, United States.
College of Environmental Science and Engineering/Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Key Laboratory of Environmental Remediation and Pollution Control, Nankai University, Tong Yan Road 38, Tianjin, 300350, PR China.
Chemosphere. 2018 Mar;195:344-350. doi: 10.1016/j.chemosphere.2017.12.095. Epub 2017 Dec 16.
The phototransformation and environmental implications of graphene oxide (GO) have been widely studied in order to understand its implications upon release into the environment. However, very little is known about the formation of reactive oxygen species (ROS) by GO under solar irradiation. Currently there are no studies on the mechanism of ROS formation by GO or the amount of ROS catalyzed by the nanomaterials in the environment. In this study, we carefully investigated the different types and formation mechanisms of ROS generated by GO in the presence of simulated solar irradiation. The effect of GO's photoactivity on bisphenol A (BPA), a representative organic co-pollutant, was also studied. The conduction band electron (e) of GO led to the formation of different ROS including OH, O, and O. Among the three types of ROS investigated, O was the most abundant species generated during simulated solar irradiation of GO. BPA was degraded, mainly due to the oxidative potential of the valence band holes produced during solar irradiation of GO. This study advances understanding of the photoactivity of GO and its potential impact on other possible environmental co-pollutants.
为了了解氧化石墨烯（GO）释放到环境中所带来的影响，人们广泛研究了其光转化和环境意义。然而，关于 GO 在太阳照射下形成活性氧（ROS）的情况却知之甚少。目前，尚无关于 GO 形成 ROS 的机制或环境中纳米材料催化的 ROS 量的研究。在这项研究中，我们仔细研究了在模拟太阳光照射下 GO 产生的不同类型和形成机制的 ROS。还研究了 GO 的光活性对双酚 A（BPA）这一典型的有机共污染物的影响。GO 的导带电子（e）导致了不同的 ROS 的形成，包括 OH、O 和 O。在所研究的三种 ROS 中，O 是在模拟太阳光照射下生成的最丰富的物质。BPA 被降解，主要归因于在 GO 太阳光照射过程中产生的价带空穴的氧化电势。本研究增进了对 GO 的光活性及其对其他可能环境共污染物的潜在影响的理解。
