Details

Autor(en) / Beteiligte

• Zhong, Weiming
• Zhang, Yuyu
• Zhao, Ling
• Li, Wanbin

Titel

Highly stable and antifouling graphene oxide membranes prepared by bio-inspired modification for water purification

Ist Teil von

• Chinese chemical letters, 2020-10, Vol.31 (10), p.2651-2656

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Graphene oxide (GO) membranes are modified by polydopamine (PDA) for strengthening the interactions of substrates to GO layers and the binding force of GO nanosheets. The obtained PDA-GO membranes exhibit good nanofiltration performance, substantially improved antifouling property, and had impressive long-term stability, even after external scratching. [Display omitted] Graphene oxide (GO) membranes show great potential in molecular separation for water treatment. However, the inferior stability of GO membranes is a major bottleneck for practical applications. In this study, bio-inspired polydopamine (PDA) deposition is reported for enhancing the stability of GO membranes. Through simple and mild immersion, PDA is self-polymerized on GO membranes. The blocking of PDA chains to membrane defects improves the rejections for various molecules. Because the inherently strong adhesion and crosslinking of PDA greatly strengthen the interactions of substrates to GO layers and the binding force of GO nanosheets, the prepared PDA-GO membranes exhibit impressive long-term stability in cross-flow filtration, and maintain good nanofiltration performance at various feed pressures, tangential velocities, and even after external scratching. Moreover, because the deposited PDA layers obstruct the direct contact between GO and contaminants, the antifouling property of the PDA-GO membranes increases substantially, with recovery ratio about 98%.