ABSTRACT
More cases of arsenic contamination are reported globally, making the restoration of arsenic in water an active area of research. Especially, As(â ¢) is more difficult to remove than negatively charged As(â ¤) due to the presence of neutral H3AsO3 in the water, so to achieve efficient separation of As(â ¢) in water, it is very important to pre-oxidize As(â ¢) to As(â ¤). Herein, Fe-coated Cu0 doped MnO2 nanowire membrane (FCMNCM) was successfully prepared to enhance the oxidation of As(â ¢) to As(â ¤) through the combination of superoxide anion (O2·-) and MnO2 oxidation. Experimental results show that Cu0 activates oxygen to generate O2·-, the generated O2·- not only significantly enhances the conversion efficiency of As(â ¢) to As(â ¤) but also oxidize the Mn(â ¡)/Mn(â ¢) produced by the reduction of MnO2 by As(â ¢) to Mn(â £) again to realize multi-channel oxidation of As(â ¢), and the maximum separation efficiency of As(Ш) can reach 99.34%. Acidic conditions are favorable for the separation of As(Ш), and carbonate and phosphate have a serious negative effect on As(â ¢) separation by competing for the active site. Anti-fouling and repeatability experimental show that FCMNCM is an environmentally friendly material with long service life and excellent reusability, it provides a new platform for As(â ¢)-containing sewage treatment.