FILTER WITH ADSORBENT CLAY MINERALS ATTACHED TO INDIVIDUAL EXPOSED SURFACES OF A FIBROUS MATRIX

摘要

An adsorbent filter for removing caffeine from liquids. The filter is composed of a liquid permeable matrix of fibrous material having individual exposed surfaces; and a distribution of adsorbent clay minerals attached to individual exposed surfaces of the fibrous material by substantially non-transient bonding, so that passage of a liquid having a caffeine concentration ranging from about 20 to about 100 mg per 100 mL of liquid through the matrix for a contact time of less than about 2 minutes results in at least a 40 percent reduction in the caffeine concentration of the liquid. The matrix of fibrous material may be selected from woven fabrics; knit fabrics and nonwoven fabrics. The adsorbent clay minerals include, for example, sodium bentonite clays, calcium bentonite clays, acidified bentonite clays, and modified bentonite clays containing a flocculating agent. Generally speaking, the filter can be adapt ed to provide at least a 40 percent reduction in the caffeine concentration for about 1 cup to about 40 cups of a liquid.