Polydopamine Enhanced Interactions of Graphene Nanosheets to Fabricate Graphene/Polydopamine Aerogels with Effectively Clear Organic Pollutants

• DOI: 10.1021/acs.langmuir.4c00363
• Publication Date: 2024-04-22T15:02:10Z
• Authors: Naipu He; Xuerui Zhao; Zongjie Li; Tingting Shi; Zongxin Li; Fengchuan Guo; Wen Li

Graphene/polydopamine aerogels (GPDXAG, where X represents the weight ratio of DA·HCl to GO) were prepared by chemical reduction graphene oxide (GO) using dopamine (DA) and l-ascorbic acid as reducing agents. During gelation process, DA was polymerized form polydopamine (PDA). The introduction PDA in led a deeper GO stronger interactions between nanosheets forced covalent cross-linking noncovalent bonding including π–π stacking hydrogen bonding. influencing formation morphology GPDXAG explored. With increasing content gelation, degree enhanced, resulting had more regular pore distribution. Additionally, introducing into improved its hydrophobicity because adhesion network aerogels. exhibited higher removal efficiency for organic pollutants than controlled (GAG). Specifically, adsorption capacity solvents superior that GAG, solvent completely separated from oil/water mixture GPDXAG. equilibrium malachite green (MG) measured be 768.50 mg/g, which methyl orange (MO). In MG/MO mixed solutions, obvious selectivity cationic dye. mechanism MG also discussed simulating kinetic models isothermal models.