Fenton-like reaction-induced degradation of Methylene Blue by using supermacroporous ferrimagnetic nanorings

Abstract

Abstract The removal and/or degradation of methylene blue (MB) from dyestuff wastewater has attracted widespread attention. Utilization of environmental purification nanomaterials is an effective means in the field of environmental remediation, and degradation efficiency under different circumstances is always a high priority for the nanoagents. In this study, uniform supermacroporous ferrimagnetic Fe 3 O 4 nanorings (sFe 3 O 4 -NRs) were fabricated for high-efficiency MB degradation. Typically, the sFe 3 O 4 -NRs were prepared by a convenient hydrothermal method. Subsequently, the morphology structure of the sFe 3 O 4 -NRs was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM) and highresolution transmission electron microscopy (HRTEM), respectively. Next, a Fenton-like reaction-induced MB degradation was performed in the present of sFe 3 O 4 -NR nanocatalysator and hydrogen peroxide (H 2 O 2 ). Meanwhile, the sFe 3 O 4 -NRs showed excellent Fenton-catalytic activity for degradation of MB in a wide range of pH (3-11). Moreover, because of the magnetic property of the sFe 3 O 4 -NRs (saturation magnetization of 34.26 emu/g), the used sFe 3 O 4 -NR could be rapidly separated from the reaction medium by using a magnet, the sFe 3 O 4 -NR resented relative high catalytic activity even after 10 times reuse. The main conclusion from this work was that the as-synthesized sFe 3 O 4 -NRs nanoagent was a type of desirable Fenton catalyst to degenerate MB from wastewater.