Are masks that claim to kill bacteria more protective?

no.

There are two main factors for judging the respiratory protection effect of masks on pathogenic microorganisms in the air:

One is its filtration efficiency for particulate matter,The second is the degree of closeness between the mask and the face of the mask wearer.

Although some products claim that the mask material will kill the bacteria on the mask (this depends on the reliability of the evaluation method),But this bactericidal effect is ineffective against bacteria penetrating from the mask and leaking from the seal,The overall effect of respiratory protection is therefore not improved.