3D hydrangea-like Mn3O4@(PSS/PDDA/Pt)n with ultrafine Pt nanoparticles modified anode for electrochemical oxidation of tetracycline

Abstract

Three-dimensional (3D) hydrangea-like Mn3O4@(PSS/PDDA/Pt)n was prepared via in situ reduction of Pt4+ on sea-urchin-like MnO2 coated with lay-by-layer (LBL) films of polyelectrolytes. Combining of ultrafine Pt nanoparticles, 3D structure and manganese oxide support makes these Mn3O4@(PSS/PDDA/Pt)n particles suitable for anode-oxidation of tetracycline (TC) with both excellent mass activity and durability. The performance and possible mechanism of TC degradation on Mn3O4@(PSS/PDDA/Pt)n anode were investigated. The maximal TC removal efficiency on Mn3O4@(PSS/PDDA/Pt)n anode achieved 98.8% at a TC concentration of 60 mg L−1, pH 7.0 and 8 V in the presence of NaCl. The TC electrochemical oxidation on Mn3O4@(PSS/PDDA/Pt)n anode followed a pseudo-first-order kinetic. Additionally, the efficiency of TC removal on Mn3O4@(PSS/PDDA/Pt)1 anode maintained more than 95% after recycling for 5 times, indicating the considerable durability. We also evaluated the application for degradation of other antibiotics. Thus, our research provides a deep insight into the preparation of efficient anode based on 3D manganese oxides loaded with ultrafine Pt particles for potential application in electrochemical oxidation of TC and other antibiotics in contaminated water.