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Chapter 3 - The right choice of catalyst is one of the elements that determine its effectiveness. Among the most commonly used catalysts, we use iron, as well as its modifications and forms such as zero-valent iron, iron oxides, etc. magnetite (Fe3O4), hematite (Fe2O3), and goethite (FeOOH) or their nanoparticles. They have a high surface area, which enhances their catalytic activity and can be easily separated from the treated water. Another popular and environmentally friendly form is waste iron, which is the product from industry such as blast furnace slag or steel slags. Moreover, iron could be dropped on carbon materials, and various carriers.

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