Study the activation mechanism of peroxymonosulfate in iron copper systems for trichloroethane degradation

Abstract

The quick development of novel water treatment techniques evaluates the mechanisms as a challenge in various systems. The participation of radical and non-radical mechanisms in the degradation of trichloroethane (TCA) in peroxymonosulfate (PMS) activated systems was demonstrated using synthetic catalysts. Various analytical characterizations represented the prominent structure and morphology of CuO and FeS2 particles. Under various circumstances, the CuO/rGO/PMS and FeS2/PMS catalysts demonstrated the coexistence of mechanisms. When compared to CuO/rGO/PMS, the FeS2/PMS system had the highest TCA removal effectiveness. The remediation performance was largely dependent on a variety of factors. The TCA degradation increased with increasing acidity in the FeS2/PMS system, whereas CuO/rGO favored basic conditions. The involvement of radical (SO4●−, OH●, and O2●−) and non-radical oxo (1O2) species has been confirmed by the chemical probe, quenching, and EPR experiment. The scavenging test identified the generation of 1O2 species in all systems that played a critical role in the studied processes. The presence of both radical and non-radical pathways in TCA degradation can be useful in the design and use of PMS activated in groundwater treatment.

Keywords

• Metallic catalysts
• Oxo species
• PMS activation
• Radical and non-radical
• TCA degradation