Abstract
Novel hexagonal nanoplates (NPLs) comprised of mesoporous carbon containing imbedded magnetic Co nanoparticles (CoAl2O4 phase) are prepared through direct carbonization of polydopamine (PDA)-coated CoAl layered double hydroxide (LDH). A uniform PDA coating initially covers the surface of LDH by dopamine self-polymerization under mild conditions. Well-dispersed Co nanoparticles are formed in the NPLs by the partial reduction of cobalt from Co2+ to Co0 with surface carbon during the heat treatment process. The surface morphology and specific surface area of the as-prepared NPLs can be tailored by adjusting the initial dopamine concentration and carbonization temperature. The mesoporous NPLs exhibit excellent sorption of rhodamine B (RhB) dye and fast magnetic separation in aqueous solution. Over 95% of RhB can be adsorbed within 2 min and the adsorption reaches equilibrium after about 30 min. The maximum adsorption capacity approaches 172.41 mg/g. After regeneration, this adsorbent can be recycled easily by magnetic separation and still possess good adsorption capacity for RhB removal, even after five cycles.
Highlights
Nanocomposites with unique electronic, mechanical, magnetic, and physicochemical properties have gained much attention because of their large specific surface area and high surface energy [1,2]
The Co nanoparticles are surrounded by a CoAl2O4 phase and a thin graphitized carbon layer, implying that the PDA@layered double hydroxide (LDH) composite is converted completely to the hexagonal NPLs-2.5-800 containing magnetic Co nanoparticles (CoAl2O4 phase) and porous carbon layer by partial reduction Co2+ ions in the lattice of LDH with carbon during carbonization process at 800 °C [15,34]
Owing to the even distribution of Co2+ in the LDH lattice and uniform PDA layer on the surface of LDH, the resultant NPLs possess a mesoporous structure and good distribution of Co nanoparticles formed by partially reducing the Co2+ with carbon after the heat treatment process
Summary
Nanocomposites with unique electronic, mechanical, magnetic, and physicochemical properties have gained much attention because of their large specific surface area and high surface energy [1,2]. Dispersed Co nanoparticles embedded in the carbon layer; and (iv) the obtained hexagonal magnetic mesoporous NPL displays a larger adsorption capacity towards removal of RhB from water than observed in other adsorbents [23,24,25,26,27,28,29,30].
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