TY - JOUR
T1 - Synthesis of a maghemite-polypyrrole nanocomposite for the removal of congo red dye from aqueous solutions
AU - Ramírez-Ortega, Alberto A.
AU - Medina-Llamas, María
AU - da Silva, Romário J.
AU - García-Elías, José
AU - de Lira-Gómez, Patricia
AU - Medina-Llamas, Juan C.
AU - Chávez-Guajardo, Alicia E.
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/12
Y1 - 2021/12
N2 - A magnetic nanocomposite (MNC) of γ-Fe2O3 nanoparticles (NPs) and polypyrrole (PPY) was synthesized by in-situ chemical oxidative polymerization of pyrrole in presence of FeCl3 as oxidizing agent in order to evaluate its adsorption capacity of Congo red (CR) in aqueous solutions. γ-Fe2O3 NPs were first synthetized by a co-precipitation method with an average particle size of 14 ± 8 nm. In a subsequent step, the MNC was synthesized by the polymerization of pyrrole in an aqueous solution containing the γ-Fe2O3 NPs. The resulting material consisted of maghemite NPs embedded within the polymeric matrix of PPY. The magnetization curves demonstrated the superparamagnetic behavior of the γ-Fe2O3 NPs at room temperature (Ms = 60 emu/g), while the magnetization value of the γ-Fe2O3/PPY MNC decreased up to 14 emu/g. We evaluated the CR adsorption removal of the MNC as a function of the pH, interaction time and the initial dye concentration. The maximum adsorption capacity (qe) achieved was 269.5 mg/g at pH 7.0 and 60 min of interaction time. The present work shows the production of an effective and economic magnetic adsorbent for the removal of dyes from aqueous solutions.
AB - A magnetic nanocomposite (MNC) of γ-Fe2O3 nanoparticles (NPs) and polypyrrole (PPY) was synthesized by in-situ chemical oxidative polymerization of pyrrole in presence of FeCl3 as oxidizing agent in order to evaluate its adsorption capacity of Congo red (CR) in aqueous solutions. γ-Fe2O3 NPs were first synthetized by a co-precipitation method with an average particle size of 14 ± 8 nm. In a subsequent step, the MNC was synthesized by the polymerization of pyrrole in an aqueous solution containing the γ-Fe2O3 NPs. The resulting material consisted of maghemite NPs embedded within the polymeric matrix of PPY. The magnetization curves demonstrated the superparamagnetic behavior of the γ-Fe2O3 NPs at room temperature (Ms = 60 emu/g), while the magnetization value of the γ-Fe2O3/PPY MNC decreased up to 14 emu/g. We evaluated the CR adsorption removal of the MNC as a function of the pH, interaction time and the initial dye concentration. The maximum adsorption capacity (qe) achieved was 269.5 mg/g at pH 7.0 and 60 min of interaction time. The present work shows the production of an effective and economic magnetic adsorbent for the removal of dyes from aqueous solutions.
KW - Adsorption
KW - Conductive polymers
KW - Congo red
KW - Dyes
KW - Iron oxide
KW - Magnetic nanocomposite
UR - http://www.scopus.com/inward/record.url?scp=85118593855&partnerID=8YFLogxK
U2 - 10.1016/j.enmm.2021.100597
DO - 10.1016/j.enmm.2021.100597
M3 - Artículo
AN - SCOPUS:85118593855
SN - 2215-1532
VL - 16
JO - Environmental Nanotechnology, Monitoring and Management
JF - Environmental Nanotechnology, Monitoring and Management
M1 - 100597
ER -