Novel Application of MnO2–H2O2 System for Highly Efficient Arsenic Adsorption and Oxidation

A novel manganese dioxide–hydrogen peroxide (MnO2–H2O2) system was developed for effective Arsenic (As) removal. Under the specified conditions of no external mechanical stirring, a trace H2O2 concentration 0.015 wt%, and MnO2 25 mg/L, high removal efficiency (88%) As (100 µg/L) achieved by MnO2–H2O2 within 30 min, which differs from conventional adsorption processes that require stirring arsenite (As (III)) oxidation–adsorption quantities oxidants (such as ozone) specially synthesized adsorbents/catalysts. The (III) attributed to turbulent precipitated extensively generated oxygen (O2) catalytic decomposition H2O2, efficient on surface MnO2, generation reactive radicals including hydroxyl superoxide (•OH •O2−). Moreover, adsorbents before after were characterized systematically, verified using electron spin resonance (ESR). results showed formation inner-sphere complexes groups particles responsible process, oxidation arsenate (V)) via radicals. influences representative environmental factors performance application in river water ground further studied tested. In conclusion, offers several advantages, low cost, ease operation, strong adaptability, making it highly promising practical treatment applications.