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Commonly used reducing agents in wastewater treatment

Nov 09, 2020

After electrons are given, they are oxidized into positively charged neutral atoms, such as iron filings, zinc powder, etc.;

Negatively charged atoms are oxidized to positively charged atoms after giving electrons. For example, the boron element in sodium borohydride has a negative valence of 5, which can reduce mercury ions to metallic mercury under alkaline conditions, and at the same time it is oxidized. Into positive trivalent.

A metal or non-metal positively charged atom is oxidized to a higher positively charged atom after giving an electron. For example, the divalent iron ion Fe2+ in ferrous sulfate and ferrous chloride is oxidized to trivalent iron ion Fe3+ after giving one electron; the tetravalent sulfur in sulfur dioxide SO2 and sulfite SO32- gives two electrons Later, it is oxidized to hexavalent sulfur, forming SO42-.