Ministry of Education Key Laboratory of Enhanced Heat Transfer &Energy Conservation, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong 510640, China.
Department of Chemical &Biomolecular Engineering and Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States.
Sci Rep. 2017 Mar 2;7:43755. doi: 10.1038/srep43755.
Millions of tons of wastewater containing both inorganic and organic pollutants are generated every day, leading to significant social, environmental, and economic issues. Herein, we designed a graphene foam/TiO nanosheet hybrid, which is able to effectively remove both chromium (VI) cations and organic pollutants simultaneously. This graphene foam/TiO nanosheet hybrid was synthesized via a facile single-step one-pot hydrothermal method. The structure of the hybrid was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The hybrid was evaluated for both chromium (VI) and organic pollutants (using methyl blue (MB) as an example) removal, and the removal mechanism was also investigated. During water treatment, graphene and TiO nanosheets function complimentarily, leading to a significant synergy. The hybrid exhibited outstanding chromium (VI) and MB removal capacity, much superior to the performance of the individual pure TiO sheets or pure graphene foam. The hybrid could also be easily separated after water treatment, and exhibited excellent recycle stability. Considering the very facile synthesis of this graphene foam/TiO nanosheet hybrid, and its excellent water treatment performance and recycle stability, such a hybrid is promising for large scale production for practical applications where both chromium (VI) cations and organic dyes are the main pollutants.
每天都会产生数百万吨含有无机和有机污染物的废水，这导致了重大的社会、环境和经济问题。在这里，我们设计了一种石墨烯泡沫/二氧化钛纳米片的杂化材料，它能够有效地同时去除六价铬阳离子和有机污染物。这种石墨烯泡沫/二氧化钛纳米片的杂化材料是通过简便的一步一锅水热法合成的。通过扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 对杂化材料的结构进行了表征。评估了该杂化材料对六价铬 (以甲基蓝 (MB) 为例) 和有机污染物的去除效果，并研究了去除机制。在水处理过程中，石墨烯和二氧化钛纳米片相互补充，产生了显著的协同作用。该杂化材料表现出出色的六价铬和 MB 去除能力，远优于单独的纯二氧化钛片或纯石墨烯泡沫的性能。处理后的水后，该杂化材料很容易分离，并表现出优异的可循环稳定性。考虑到这种石墨烯泡沫/二氧化钛纳米片杂化材料的制备非常简便，以及其出色的水处理性能和可循环稳定性，这种杂化材料有望大规模生产，用于同时存在六价铬阳离子和有机染料这两种主要污染物的实际应用中。
