Water pollution from wastewater is still a major environmental concern today. One of the most harmful pollutants is a dye,
which is produced in large quantities by a variety of industries, including textile, paper, petrochemical, and plastics. Herein,
in the presence of biopolymer chitosan (Cs), controllable synthesis of chitosan/tungsten oxide (Cs/WO3) nanosheet was
explored by a precipitation method at room temperature (R.T). The physicochemical properties of Cs/WO3 nanosheet specimens
were evaluated using different tools such as XRD, SEM, TEM, EDX, and UV–Vis spectrophotometry. The tunable size
for exhibited sheets ranged from 100 to 400 nm and 60 to 200 nm thickness. Under optimal conditions, the photocatalytic
decomposition of methylene blue (MB) was investigated via visible light irradiation, and 0.6 g Cs/WO3 nanosheet proposed
complete decomposition of MB within 40 min at neutral pH. Also, the antibacterial effects of the Cs/WO3 nanosheet against
Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) bacteria are examined. The research demonstrates that the
green-prepared WO3
displays outstanding antibacterial activity against bacterial strains and a drop-in bacterial activity after
24 h.