UV–vis spectra of the biosynthesised Ag‐NPs in aqueous dispersion prepared using B. subtilis cultivated on
a LB medium
b Molasses
c Sterilised brewery effluents no. 4
d Sterilised brewery effluents no. 6
Spectra were recorded after dilution of synthesised Ag‐NPs dispersions to concentration of silver 12 mg/l