Journal
APPLIED SURFACE SCIENCE
Volume 560, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2021.149926
Keywords
Cr(VI) reduction; Chemical modification; Palladium nanocrystals; Formic acid decomposition; Synergistic effect
Categories
Funding
- Natural Science Foundation of Liaoning Province of China [2019-MS-018]
- research foundation of Huaiyin Normal University [HSXT2313]
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The PE@Pd-RGO hybrids synthesized through a simple adsorption-reduction strategy exhibit excellent catalytic activity and stability in hexavalent chromium reduction, attributed to their outstanding water solubility and unique electrostatic attraction.
Palladium-catalytic hydrogenation is an efficient method for remediating inorganic/organic contaminants. Herein, a very simple adsorption-reduction strategy is applied to synthesize the polyethylenimine (PE) modified ultrafine palladium nanocrystals on reduced graphene oxide (RGO) hybrids (PE@Pd-RGO). The surface composition, structure, and morphology of PE@Pd-RGO hybrids are minutely characterized by various physical characterization techniques and the formation mechanism of PE@Pd-RGO hybrids is defined according to experimental observation. Physical characterizations demonstrate that palladium nanocrystals with only 2.91 nm size uniformly anchor at RGO surface and PE modification endows PE@Pd-RGO hybrids with eminent watersolubility. When applied as catalyst for hexavalent chromium reduction, PE@Pd-RGO hybrids reveal excellent catalytic activity (rate constant: 0.0785 min-1, turnover frequency: 1.166 molCr molPd- 1 min-1) and stability due to the small particle size of palladium nanocrystals, excellent colloidal stability, and distinctive electrostatic attraction between PE with -NH3+ and Cr2O72- ion.
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