Synthesis of bimetallic crednerite nanosheet as an efficient heterogeneous catalyst in Fenton-like degradation of bisphenol A

Abstract

Integrating bimetallic oxides into peroxymonosulfate (PMS) based advanced oxidation processes is appealing to span the limited kinetics in view of the interaction between multiple active sites. Herein, the crednerite (CuMnO₂) nanosheet, synthesized through a low-temperature hydrothermal method, has demonstrated significant potential for water remediation. The as-prepared CuMnO₂ sample was characterized by involving morphology, crystal texture, and physicochemical property. The catalytic activity of CuMnO₂ on PMS activation was evaluated, and the influence of PMS concentration, catalyst dosage, and pH value on the removal of bisphenol A (BPA) was investigated. Over an abroad pH range from 4.0 to 10.0, more than 90% BPA could be effectively removed after 60 min reaction with the lower dosages of 0.2 g·L⁻¹ catalyst and 0.4 mmol·L⁻¹ oxidant. In terms of reaction pathways, the metal (Cu/Mn)-hydroxyl moiety with cooperative effect and good redox cycle mediate the disaggregation of adsorbed PMS into surface-bound sulfate and hydroxyl radicals, which are mainly responsible for the swift elimination and mineralization of BPA in the CuMnO₂/PMS system. This work provides a constructive paradigm for the development of a cost-effective heterogeneous Fenton-like reaction toward environmental purification.