Synthesis of orange-like Fe3O4/PPy composite microspheres and their excellent Cr(vi) ion removal properties

Abstract

Uniform orange-like Fe 3 O 4 /polypyrrole (PPy) composite microspheres have been synthesized using Fe 3 O 4 microspheres as a chemical template under sonication. In the orange-like Fe 3 O 4 /PPy composite microspheres, the Fe 3 O 4 particles played the role of ''seeds'' while the PPy was the ''pulp and peel''. A growth mechanism for the orange-like Fe 3 O 4 /PPy composite microspheres was proposed in which partial pyrrole monomers are immersed into the gaps of Fe 3 O 4 microspheres under sonication, meanwhile Fe 3+ ions released from Fe 3 O 4 microspheres in an acidic environment initiated the polymerization of pyrrole monomers in the interior or around the Fe 3 O 4 microspheres, finally forming an orange-like structure. When used as an absorbent of Cr(VI) ions, the as-obtained Fe 3 O 4 /PPy microspheres showed strong adsorption capability with an adsorption capacity of about 209.2 mg g À1 , which is mainly attributed to the PPy ''pulp and peel''. Furthermore, the magnetic Fe 3 O 4 ''seeds'' in composite microspheres make them easy to separate from wastewater by magnetic separation. Recently, polymers, including polyaniline, polyacrylonitrile, poly(p-phenylenediamine), polypyrrole, and sulfophenylenediamine copolymer, were found to be highly efficient absorbents due to their rich functional groups such as -C]O, -CN, -OH, -COO À , etc. [18][19][20][21][22][23][24][25] These polymers exhibited good adsorption performance for heavy metal ions such as Cr(VI) ions. However, it is difficult to synthesize magnetic-based polymer composite materials, since polymers such as polypyrrole or polyaniline are hydrophobic but the surfaces of magnetic particles are

Pd Nanoparticles Immobilized on Orange-Like Magnetic Polymer-Supported Fe3O4/PPy Nanocomposites: A Novel and Highly Active Catalyst for Suzuki Reaction in Water

“…In Fig. 1b, the peaks at around 1,610 cm -1 (C=C stretching vibration), 1,330 cm -1 (C-N stretching vibration) and 1,030 cm -1 (C-H out-of-plane vibration), 3,398.8 cm -1 (N-H stretching vibration) are clearly observed, responding to characteristic of the PPy framework [33]. The result indicates that based on the Magnetic measurements of the samples were done by a vibrating sample magnetometer at room temperature in the applied magnetic field ranging from -15,000 to 15,000 Oe.…”

“…(Fig. 1a), the characteristic peaks centered at around 581.3 cm -1 is assigned to Fe-O bound stretching [33]. In Fig.…”

“…The Fe 3 O 4 /PPy composite were prepared using a published method with a slight modification [33]. Fe 3 O 4 particles (0.3 g) were dispersed in 70 mL H 2 O under sonication, and then pyrrole (3 mL) in alcohol (15 mL) and HCl solution (15 mL, 6 M) were added into the above solution in turn under sonication for 1.5 h. The black product was collected with the help of a magnet, washed with deionized water repeatedly to remove the residual pyrrole monomers and HCl, and then dried in a vacuum overnight.…”

“…Furthermore, the magnetic Fe 3 O 4 ''seeds'' in composite microspheres make them easy to separate from wastewater by magnetic separation. The orange-like Fe 3 O 4 /PPy magnetic polymer possesses good water solubility and has been used previously to adsorb Cr ions in water [33]. To the best of our knowledge, this is the first time to apply such a material as a support to load Pd for catalyzing Suzuki crosscoupling reaction.…”

Synthesis of magnetic hollow carbon nanospheres with superior microporosity for efficient adsorption of hexavalent chromium ions

“…

[19], polymer-based composites [20][21][22][23], a graphene oxide (GO)-based composite adsorbent [24], and activated carbon [25][26][27][28] have been explored and used in the removal of Cr(VI). Among these adsorbents, carbonaceous porous materials have been successfully used in the removal of Cr(VI) because of their acid and alkali corrosion resistance, excellent thermal and chemical stability and high adsorption capacity for heavy metals [29].

In contrast to bulk materials, the high specific surface area of nanoscale materials provides more surface active sites, and good dispersability in solution to help facilitate mass transfer [1,30].

…”