Bismuth(IV) Peroxide

Bismuth(IV) peroxide, also known as bismuth dioxide or bismuth(IV) oxide, is a chemical compound with the formula BiO2. It is a dark brown to black powder that is insoluble in water and acids but soluble in concentrated alkalis.

Bismuth(IV) peroxide can be prepared by heating bismuth trioxide in air at a temperature of around 400-500°C. Another method involves the reaction of bismuth nitrate with hydrogen peroxide.

Bismuth(IV) peroxide has a tetragonal crystal structure and is a semiconductor with a band gap of about 2.7 eV. It has been used as a catalyst in organic reactions and as an electrode material in electrochemical devices. It can also be added to pyrotechnic compositions to produce a green flame.

However, bismuth(IV) peroxide is toxic and can cause skin irritation and respiratory problems if not handled properly. It should be stored in a cool, dry place away from heat sources and incompatible substances. When working with bismuth(IV) peroxide, protective equipment such as gloves, goggles, and respirators should be worn.