Adsorption Properties of Magnetic Magnetite Nanoparticle for Coexistent Cr(VI) and Cu(II) in Mixed Solution

Abstract

The adsorption properties of coexistent Cr(VI) and Cu(II) in mixed solution on magnetic magnetite (Fe3O4) nanoparticle were studied in batch experiments. The influences of various factors, such as pH, adsorbent dose, temperature, initial concentration of metal ions, and coexisting ions in water were investigated. At the same time, the adsorption kinetics and adsorption isotherms were studied. The mechanism of adsorption for Cr(VI) and Cu(II) was investigated through the study of surface properties of Fe3O4, the presence of ions, and the influence of pH and zeta potential. The results indicate that pH has an influence on adsorption for Cr(VI) and Cu(II), and the optimal pH value for Cr(VI) and Cu(II) adsorption is 4.0. The adsorption efficiency increased with the increase of the adsorbent dose. Temperature under experimental design had no obvious effect. With 2.0 g/dm3 Fe3O4, the maximum adsorption capacity for Cr(VI) and Cu(II) reached 8.67 mg/g and 18.61 mg/g in mixed solution of 80 mg/dm3 Cr(VI) and Cu(II), respectively. Phosphorus had some influence on the adsorption for Cr(VI), and other coexisting anions and cations had no influence on the adsorption for Cr(VI) and Cu(II). The adsorption data for Cr(VI) and Cu(II) were nicely fit to the Langmuir adsorption equation and the pseudo-second-order model. As a multifunctional material, nano-Fe3O4 exhibited good adsorption performance for coexistent Cr(VI) and Cu(II) and could easily be separated and recovered under magnetic field.

Improvement and characterization of alum sludge by nano-iron oxide and rice husk for removal of methylene blue dye from aqueous solution

“…1b). This result is in agreement with (Zhang et al, 2020) who found that the isoelectric point (pH pzc ) value was between (3.0 -4.0). In an aqueous system, the surface of iron oxides is covered with groups of -FeOH, etc.…”

Adsorben Magnetit Terlapis Dimerkaptosilika untuk Adsorpsi Anion Logam [AuCl4]- dan [Cr2O7]-

“…Magnetite atau Fe3O4 merupakan salahsatu nanopartikel yang banyak disintesis untuk berbagai aplikasi [3] . Sifat ferromagnetik dari magnetit telah banyak dimanfaatkan sebagai adsorben dalam mengadsorpsi kation-kation logam dari limbah cair [4] .…”

Magnetically Functionalized Moss Biomass as Biosorbent for Efficient Co2+ Ions and Thioflavin T Removal

“…It is evident that the distribution of Co on the biomass surface is closely associated with almost all Fe 3 O 4 aggregates (Fe and O-rich regions on elemental maps, Figure 8 ), indicating that the synergistic interactions with Fe 3 O 4 lead to the higher adsorption capacity of Co 2+ ions by the magnetic biosorbent. In aqueous solutions, −FeOH groups are present on iron oxide surfaces, and depending on the solution pH, they protonate or deprotonate to FeOH 2 + and FeO − [ 40 ]. With the increase in the solution pH, FeO − increased, facilitating the removal of Co 2+ by electrostatic adsorption [ 10 , 25 ].…”