Abstract：To explore the effects of different concentrations of ionic on the adsorption capacity of Salmonella K533, the structures of natural zeolite and formic acid-modified zeolite were compared. The natural zeolite was modified by formic acid, and its structural changes were assessed by measuring the specific surface area and the XRD map. The absorption characteristics of natural zeolite and formic acid-modified zeolite were investigated with different concentrations of K+, Cu2+ and HPO42?. The results showed that the specific surface area of formic acid-modified zeolite increased when compared with natural zeolite. The impurities of modified zeolite reduced in XRD map. Under the equal ionic conditions, the adsorption quantity of modified zeolite was significantly higher than those of natural zeolite (P<0.01). In certain range of ionic concentration, absorption quantity increased markedly as increasing ionic concentration, and it decreased while the ionic concentration beyond the limit. These findings indicated that modified zeolite had better absorption effect than natural zeolite.
