Influence on acetaldehyde adsorption ability of talc by mechanochemical treatment was investigated. Talc was subjected to mechanochemical treatment for 5, 10, 20, 30, and 60 min using a planetary ball mill. The treated samples were characterized by X-ray diffraction, N_2-adsorption, and Fourier transform-infrared spectroscopy. The mechanochemical treatment led to a decrease in crystallinity and a significant increase in specific surface area. The specific surface area reached a maximum at 10 min. The number of surface hydroxyl groups increased with increase in treatment time. The mechanochemical treatment of talc resulted in an improvement in acetaldehyde adsorption ability. The highest adsorption ability occurred for the 30 min treated sample.