Yang Kun, Huang Lin-Jun, Wang Yan-Xin, Du Ying-Chen, Zhang Zhi-Jie, Wang Yao, Kipper Matt J, Belfiore Laurence A, Tang Jian-Guo
Institute of Hybrid Materials, National Center of International Research for Hybrid Materials Technology, National Base of International Science & Technology Cooperation, College of Materials Science and Engineering, Qingdao University, Qingdao 266000, China.
Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, CO 80521, USA.
Nanomaterials (Basel). 2020 Mar 3;10(3):454. doi: 10.3390/nano10030454.
Three types of graphene oxide/silver nanoparticles (GO/AgNPs) composite membranes were prepared to investigate size-effect of AgNPs on nanofiltration ability. The size of AgNPs was 8, 20, and 33 nm, which was characterized by UV-visible spectroscopy and transmission electron microscopy. The morphology and structure of GO and GO/AgNPs composite membranes were characterized by atomic force microscopy, scanning electron microscopy, and X-ray diffraction. The filtration performance of membranes were evaluated on a dead-end filtration device. When the size of AgNPs is 20 nm, the GO/AgNPs composite membrane has the highest water flux (106.1 L m h bar) and rejection of Rhodamine B (RhB) (97.73%) among three types of composite membranes. The effect of feed concentration of dye solution and the flux of common solvent was also investigated. The mechanism was discussed, which demonstrated that both interlaying spacing and defect size influence the filtration ability of membrane, which is instructive to future study.
制备了三种类型的氧化石墨烯/银纳米颗粒（GO/AgNPs）复合膜，以研究AgNPs的尺寸对纳滤能力的影响。AgNPs的尺寸分别为8、20和33nm，通过紫外可见光谱和透射电子显微镜对其进行了表征。利用原子力显微镜、扫描电子显微镜和X射线衍射对GO和GO/AgNPs复合膜的形态和结构进行了表征。在死端过滤装置上评估了膜的过滤性能。当AgNPs的尺寸为20nm时，GO/AgNPs复合膜在三种复合膜中具有最高的水通量（106.1L m⁻² h⁻¹ bar⁻¹）和罗丹明B（RhB）截留率（97.73%）。还研究了染料溶液进料浓度和普通溶剂通量的影响。对其机理进行了讨论，结果表明层间距和缺陷尺寸均会影响膜的过滤能力，这对未来的研究具有指导意义。
