天然及甲酸改性沸石对沙门氏菌K_(533)吸附作用的影响

Adsorption capacity of Salmonella K_(533) on zeolite and formic acid-modified zeolite

采用甲酸对天然沸石改性,通过测定其比表面积和XRD图谱评定其结构变化;并在不同浓度的K+、Cu2+、HPO42-存在条件下,比较了天然沸石及改性加工后对沙门氏菌K533的吸附性能.结果表明:天然沸石经甲酸改性后,BET比表面积增加;由XRD图谱可见,改性沸石表面杂质减少;在离子浓度相同的条件下,改性沸石对沙门氏菌K533的吸附量极显著高于天然沸石(P<0.01),且在一定离子浓度范围内,天然沸石、改性沸石的吸附量随离子浓度的增加而增大.综上所述,甲酸改性沸石对沙门氏菌K533的吸附性能优于天然沸石.

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.