Abstract
A novel superhydrophobic & catalytic bifunctional MnO2@Al2O3 composite ceramic membrane was prepared, and characterized for catalytic oxidation of sulfite through membrane aeration. Manganese dioxide on the ceramic membrane was fabricated via the hydrothermal synthesis method with ammonium persulfate and manganese sulfate. The three-dimensional structure and rough surface were formed by the staggered spines of sea urchins-like MnO2 particles. Stearic acid was used as the hydrophobic modifying reagent to reduce surface free energy. The synthesized composites exhibit excellent superhydrophobicity with a maximum static water contact angle of 164.9° ± 5.3°. The reaction parameters could affect the hydrophobicity by changing the morphology of MnO2. The bifunctional membrane could also promote the oxidation rate of sulfite, which was increased by 44.0% in Na2SO3 solution and 64.2% in (NH4)2SO3 solution.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
