Zheng Sainan, Hao Liying, Zhang Lei, Wang Kun, Zheng Wenyue, Wang Xiuqing, Zhou Xuedong, Li Wei, Zhang Linglin
J Biomed Nanotechnol. 2018 Jul 1;14(7):1263-1276. doi: 10.1166/jbn.2018.2584.
New materials with good purification of water quality (heavy metal ions removal and inhibition of bacteria) have increasingly attracted more research attentions. Considering the advantages of zinc oxide (ZnO) and tea polyphenol functionalized and reduced graphene oxide (TPG), the TPG-ZnO composites were prepared under moderate hydrothermal method and characterized by various methods. Lead ions (Pb2+) and Streptococcus mutans (S. mutans) were used to evaluate the adsorption capacity and antimicrobial activity of the TPG-ZnO, respectively. The influencing factors for heavy metal ions removal (pH, contact time), adsorption kinetics, and isotherms were discussed in this article. Furthermore, their antibacterial properties against S. mutans were investigated by counting of colony-forming units (CFU), scanning electron microscope (SEM) and confocal laser scanning microscopy (CLSM). Results showed that the novel TPG-ZnO composites presented higher adsorption efficiency for Pb2+ (98.92%) compared with pure ZnO and enhanced antibacterial activity effects (99.99%) towards S. mutans, compared with pure ZnO and TPG (P < 0.05). The TPG-ZnO composites are therefore promising water purification materials for application in high-efficient removal of heavy metal ions and inhibition of bacterial growth.
具有良好水质净化性能（去除重金属离子和抑制细菌）的新型材料越来越受到更多的研究关注。考虑到氧化锌（ZnO）以及茶多酚功能化还原氧化石墨烯（TPG）的优势，采用温和水热法制备了TPG-ZnO复合材料，并通过多种方法对其进行了表征。分别使用铅离子（Pb2+）和变形链球菌（S. mutans）来评估TPG-ZnO的吸附能力和抗菌活性。本文讨论了去除重金属离子的影响因素（pH值、接触时间）、吸附动力学和等温线。此外，通过菌落形成单位计数（CFU）、扫描电子显微镜（SEM）和共聚焦激光扫描显微镜（CLSM）研究了它们对变形链球菌的抗菌性能。结果表明，与纯ZnO相比，新型TPG-ZnO复合材料对Pb2+具有更高的吸附效率（98.92%），与纯ZnO和TPG相比，对变形链球菌具有增强的抗菌活性效果（99.99%）（P < 0.05）。因此，TPG-ZnO复合材料是用于高效去除重金属离子和抑制细菌生长的有前景的水净化材料。
