Magnetic Fe3O4/MnO2 core–shell nano-composite for removal of heavy metals from wastewater

Abstract

Feasible reutilization of sorbents was crucial to the waste water treatment process cost-effective and environmental friendly. Magnetic Fe 3 O 4 /MnO 2 composites as sorbents were recycle utilized to remove heavy metals ions [Pb(II), Cu(II), Cd(II) and Zn(II)] from industrial wastewater. In this paper, The Fe 3 O 4 /MnO 2 composites structure and interface adsorption mechanism were investigated by chemical affinity, Zero potentials combining with XRD, FTIR and TEM. The adsorption, desorption and recycle experiments were explored. The results indicated that Fe 3 O 4 /MnO 2 composites were nano structure with consisting of two layers with Fe 3 O 4 in the core and amorphous MnO 2 on the shell. The adsorption mechanism was that the heavy metals substituting for H of Mn-O-H and forming the structure of Mn-O-Me which meant the metals removal was the process of ion exchange. The sorbent removal efficiency of Cu, Cd, Pb and Zn were 99.81%, 99.76%, 98.1%, 83.25%, respectively. The equilibrium data analysis indicated that the Langmuir model was the most appropriate model to describe the adsorption of on the surface of Fe 3 O 4 /MnO 2 composites. The kinetics studies showed that the adsorption kinetics of heavy metal ions on the surface of Fe 3 O 4 /MnO 2 composites was significantly appropriate to pseudo-second-order model. The experiments verified that the Fe 3 O 4 /MnO 2 sorbent being separated from water by external magnetic field for recycling was feasible for environmental friendly and efficient remove heavy metal ions.

Recent advances in dye and metal ion removal using efficient adsorbents and novel nano-based materials: an overview

“…3 ). The same conclusion was reported by Li et al 42 for the adsorption of Zn 2+ , Cu 2+ , Cd 2+ , and Pb 2+ onto Fe 3 O 4 /MnO 2 nano-composites. On the other hand, the adsorbent dosage is particularly at the heart of applying any economic study of adsorbent per unit of wastewater to be treated.…”

“…Accordingly, this could increase the efficiency of removing dyes and reduce the concentrations of other undesirable contaminants like heavy metals. 42 Baby et al 43 reported that adsorption of Cr 6+ , Pb 2+ , Cd 2+ , and Zn 2+ onto palm kernel shell adsorbent was increased with an increase in adsorbent dosage ( Fig. 3 ).…”

“…On October 2019, he started to work at Toyohashi University of Technology, Japan as a research student followed by a PhD studentship on October 2020 aer receiving a MEXT scholarship. He published (42) articles in peer-reviewed journals with a total impact factor of (188.31). According to Google scholar, his H-index is (18) and his research work was cited (676) time.…”

Synthesis of an Alginate-Based Fe3O4–MnO2 Xerogel and Its Application for the Concurrent Elimination of Cr(VI) and Cd(II) from Aqueous Solution

“…The peak at 1646 cm −1 is due to stretching vibration from a combination of the Mn−O and −OH groups. 31 Figure 6b is the IR spectrum of the AX, in which a strong band at 3244 cm −1 was due to stretching of the −OH group of alginate. The appearance of strong bands at 1587 and 1416 cm −1 corresponds to asymmetric and symmetric stretching of the −COO (carboxyl) group of alginate, while the peak at 1025 cm −1 is due to stretching of the C−O−C bond.…”

“…Figure a shows the IR spectrum of mMO nanoparticles in which the peak at 3321 cm –1 is the characteristic stretching vibration peak of Fe–OH. The peak at 1646 cm –1 is due to stretching vibration from a combination of the Mn–O and −OH groups Figure b is the IR spectrum of the AX, in which a strong band at 3244 cm –1 was due to stretching of the −OH group of alginate.…”