Carbonized Resin with Fe&Co Bimetal for Peroxymonosulfate Activation to Degrade Atrazine

Abstract

In this study, the carbon-based bimetallic material (Fe1Co2@C) was fabricated via calcining cationic resin exchanged with Fe and Co cations. It exhibited superior peroxymonosulfate (PMS) activation performance to degrade atrazine (ATZ) compared with the monometallic materials (Fe@C and Co@C). Fe1Co2@C/PMS performed high degradation of 5 mg/L ATZ with the reaction rate constant (kobs) of 0.0869 min−1 within 30 min of reaction time. The radical quenching experiments and electron paramagnetic resonance (EPR) testified that SO4•− and •OH jointly contributed to the pollutants degradation, especially •OH was the dominant reactive oxygen species (ROS). According to the above experimental conclusions, it was demonstrated that −(C−SO3)x−Co(II) and the synergy between Fe and Co on the Fe1Co2@C can both promote the heterogeneous redox cycles of Co(II)/Co(III) and Fe(II)/Fe(III) to activate PMS. Possible degradation pathways of ATZ were also proposed based on the detection results of intermediates by LC-MS. This research not only provided a simple method to prepare carbon-based bimetallic catalyst for water treatment, but also proposed a new way for reusing the waste saturated cation resin waste with heavy metal.

Keywords: Carbonized cation resin, Carbon-based material, Iron and cobalt bimetallic, PMS, ATZ degradation