Manganese-catalysed oxidation of water to oxygen

Overall, PS II consists of the following necessary elements (those involved directly with water oxidation are shown in bold)  

1 (role still relatively obscure, but may be related to structure stabilisation or regulation) 

Electrons to reaction centre via l i osine radical cation H to the aqueous phase 

what makes manganese so suitable as an oxidation catalyst This question may be summarised by the following points  

Manganese has a large variety of stable or metastable oxidation states (-Ell, -Elll, -ElV, +VI, +V11). Manganese exhibits labile binding of ligands. 

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The decomposition of hydrogen peroxide, H Oj, to oxygen and water is catalysed by manganese(lV) oxide, a Define the term catalyst. 

Thus, Figure 4.4 shows a pressure vessel filter, operating in upflow mode, and developed for the removal of dissolved iron from water supplies. The filter medium takes the form of a bed of catalysed manganese dioxide in grannlar form, approximately 1 m deep. This medium has the ability to cause dissolved iron to react with the oxygen present in the water to form insoluble iron oxides, which will precipitate and be retained by the bed. Cleaning is then undertaken by a high velocity backwash process which fluidizes the bed medium and removes the precipitated iron. 

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