Magnetic MnFe2O4-MIL-53 (Fe) composite as an effective adsorbent for As(V) adsorption in wastewater

Abstract

Arsenic as a significant hazardous pollutant has a severe threat to the natural system, human health, and social sustainability due to its high toxicity and carcinogenicity. Herein, an effective magnetic composite material, MF-MIL-53 (Fe), was fabricated by loading magnetic composite material MF on MIL-53(Fe) for removing As (V) from wastewater. Scanning electron microscope (SEM) imaging combined with energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) were used to reveal the Physico-chemical characteristics of the composite material MF-MIL-53 (Fe). The effect of four independent variables, including pH (2–9), reaction times (10–360 min), initial concentrations (30–300 mg/L), and temperatures (298–318 K), on sorption performance, were carried out. The composite material MF-MIL-53 (Fe) displayed under neutral conditions a high adsorption capacity of 402 mg/g, which is twice that of any previously reported As (V) adsorbents. Bath experiments show that MF-MIL-53 (Fe) exhibits high selectivity toward As (V). In addition, Pseudo-second-order, Langmuir models, and single-layer adsorption reasonably explain kinetics for As (V). Thermodynamic studies revealed that the sorption process was spontaneous and endothermic. The mechanism study indicated that static electricity and surface adsorption effects were the main mechanisms responsible for As (V) ions adsorption. Moreover, the adsorption efficiency of MF-MIL-53 (Fe) is still very high at 88.04% after 5 cycles, demonstrating good adsorption and reconciliation circulation. This research provided an easy method to prepare new composite materials MF-MIL-53 (Fe) for removing As (V) from wastewater.