Hydroxylamine facilitated heterogeneous fenton-like reaction by nano micro-electrolysis material for rhodamine B degradation

Abstract

Heterogeneous Fenton-like oxidation is a promising method in dealing with organic pollutants. So far, the interaction of the nano micro-electrolysis material (nMET) and hydroxylamine (HA) Fenton-like system still needs to be explored. A HA-favored degradation of rhodamine B (Rh B) with nMET/H2O2 system was investigated in this paper. The influences of various experimental factors, as well as reuse and universal adaptability of the catalyst and the intermediates were comprehensively assessed. Under the near-neutral pH condition, the degradation efficiency of Rh B was up to 100% with H2O2 (1 mM), HA (0.1 g/L) and nMET (0.03 g/L) at 8 min, which was ascribed to the iron ions leaching and accelerated Fe(III)/Fe(II) recycle by the promotion of HA. As confirmed by the Electron paramagnetic resonance (EPR) and quenching experiments tests, singlet oxygen (1O2) and hydroxyl radical (•OH) were the predominant reactive oxygen species (ROS) for the degradation of Rh B molecules in nMET/H2O2/HA system, then the potential mechanism of ROS generation and pathway of Rh B degradation were proposed. This study furnishes a novel perspective for ROS generation from the micro-electrolysis function, proving that nMET is feasible for the efficient degradation of organic contaminants in heterogeneous Fenton-like system.