Which metal is used to make gasmasks

Explanation:

Gas mask filters include activated carbon,

absorbents that trap toxins in millions of micro-pores. It is the same compound used to filter water and treat ingestion of poisons. The activated carbon traps the toxins, but in gas masks it is further augmented with metal oxides, such as copper and molybdenum, to help break down the toxins.

A lot of research is being done in Berkeley labs