Zinc–iron silicate for heterogeneous catalytic ozonation of acrylic acid: efficiency and mechanism
Yue Liu, Jimin Shen, Laiqun Zhao, Weiqiang Wang, Weijin Gong, Fanfan Zheng
Abstract
deposits were formed on the surface of poor crystallinity zinc-iron silicate which contained abundant functional groups. Catalytic ozonation test results revealed that zinc-iron silicate exhibited high catalytic activity and stability in catalytic ozonation of AA in aqueous solution. The inclusion of zinc-iron silicate in the ozonation process enhanced AA decomposition by 28.7% and TOC removal by 20%, compared to the ozonation alone. The main AA removal mechanisms involved direct oxidation by ozone and indirect oxidation by hydroxyl radicals generated by the ozone chain reaction accelerated by zinc-iron silicate. The surface characteristics and chemical composition are significant factors determining the catalytic activity of zinc-iron silicate.