Filtrates with Hydroxyl Radicals Prepared using Al + Acid + H2O2 for Removing Organic Pollutants
Xiao-Han Guo1,2, Yang Yang1,2, Zhen-Yan Deng1,2
1Energy Materials & Physics Group, Department of Physics, Shanghai University, Shanghai 200444, China.
Abstract:
In this work, for the first time, high-activity filtrates were prepared by the reaction of aluminum (Al) powder with hydrogen peroxide (H2O2) in acidic solution and then filtration, which were used to degrade various organic pollutants such as phenol, methyl orange, and bisphenol A. It was found that the filtrates can effectively degrade and mineralize various organic pollutants and have a high efficiency comparable to their parent Al + acid + H2O2 suspensions. The filtrates can keep their high activity for several weeks under ambient conditions, and the activity depends on their initial pH value. At a pH value of ∼3.5, the reaction activity of filtrates is the best. Electron spin resonance spectroscopy (ESR) analyses indicated that there is a large quantity of stable hydroxyl radicals (OH•) existing in the filtrates, which are responsible for the removal of organic pollutants. Furthermore, the related factors are discussed.
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