Antibacterial activity of boron-doped TiO

2

(B/TiO

2

) nano-materials under visible light irradiation and in the dark was investigated. A simple sol-gel method was used to synthesize TiO

2

nano-materials. X-ray diffraction pattern of B/TiO

2

nano-materials represents the diffraction peaks relating to the crystal planes of TiO

2

(anatase and rutile). X-ray photoelectron spectroscopy result shows that part of boron ions incorporates into TiO

2

lattice to form a possible chemical environment like Ti—O—B and the rest exist in the form of B

2

O

3

. The study on antibacterial effect of B/TiO

2

nano-materials on fungal Candida albicans (ATCC10231)

Gram-negative Escherichia coli (ATCC25922) and Gram-positive Staphylococcus aureus (ATCC6538) shows that the antibacterial action is more significant on Candida albicans than on Escherichia coli and Staphylococcus aureus. Under visible light irradiation

the antibacterial activity is superior to that in the dark.