A method for preparing and reducing cigarette filter cigarette mainstream smoke aldehydes

The present invention discloses a cigarette filter and method for preparing aldehydes in cigarette mainstream smoke may be reduced, at least by the length of the fiber of the filter plug segment and at least some reduction unit aldehyde functional compounded plug unit sections; the preparation method is a carbon material after ultrasonic dispersion in water, addition of further substances viscose ultrasonic dispersion, the dispersion obtained mixture is sprayed on the surface of the tobacco material, and drying, to obtain a composite material, a plug unit sections resulting composite volume and further the fiber composite filter rod segments rolled into filter unit; the filter is effective for selectively reducing aldehydes in mainstream cigarette smoke, and does not affect the sensory quality of cigarettes and the filter preparation method is simple, low cost to meet industrial production.