Deposition of Au nanoparticles on PDA-functionalized PVA beads as a recyclable catalyst for degradation of organic pollutants with NaBH4 in aqueous solution

Publication date: 15 July 2019Source: Journal of Alloys and Compounds, Volume 793Author(s): Yuanshuai Li, Haijun Lu, Yuting Wang, Xiaoli LiAbstractA highly active and recyclable catalyst for the deposition of Au nanoparticles on the surface of polydopamine-functionalized poly(vinyl alcohol) macroporous beads was fabricated through the oxidative polymerization of dopamine and in-situ reduction route. The morphology and structure of PVA-PDA@Au beads were characterized using scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, X-ray power diffraction and N2 adsorption–desorption measurement. The as-prepared PVA-PDA@Au beads combined the advantages of PVA-PDA beads and Au NPs. PVA-PDA@Au beads exhibited enhanced catalytic activity towards the degradation of Rhodamine B (RhB) in the presence of NaBH4 with removal efficiency up to 99.5% in 5 min at an initial RhB concentration of 100 mg/L and a catalyst amount of 0.5 g/L. PVA-PDA@Au beads could be easily separated and recycled from the reaction system by simple filtration, and reused for the degradation of RhB in six consecutive cycles with a conversion of>99%. Moreover, the mechanism for the degradation of RhB by PVA-PDA@Au beads was proposed. In addition, the catalytic ability of PVA-PDA@Au beads was further studied to remove Tetrabromobisphenol A (TBBPA), in which approximately 100% TBBPA (initial...
Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research