系统研究羟基铁柱撑改性蒙脱石(O H/Fe-Mont)吸附玉米赤霉烯酮的机理,并且通过XRD和FT-IR表征手段进行表征,研究表明:(1)OH/Fe-Mont对玉米赤霉烯酮(ZEA)吸附量远高于未改性蒙脱石(K10-Mont),当n(OH)/n(Fe)为1.5时最高达到0.283 mg/g,是K10-Mont吸附量(0.054 mg/g)的5倍;XRD分析表明羟基铁柱撑蒙脱石层间距扩增是吸附量增加的主要原因;(2)OH/Fe-Mont和K10-Mont对ZEA等温吸附符合Freundlich等温吸附模型;FT-IR分析表明离子交换是ZEA进入蒙脱石的主导机制;(3)OH/Fe-Mont和K10-Mont对ZEA吸附较佳pH值为8,温度为35℃;(4)吸附动力学模型符合伪二级动力学模型,相关系数R2>0.99,且1.5OH/Fe-Mont初始吸附速率和平衡吸附量均远高于K10-Mont.
Adsorption of zearalenone (ZEA)by hydroxyl-Fe intercalated montmorillonite (OH/Fe-Mont)was investigated,at the same time,the adsorption materials were analyzed by XRD and FT-IR instrument.Main conclusions of this work were drawn as follows:(1)The adsorption capacity of OH/Fe-Mont to ZEA was much higher than that of K10-Mont.When the molar ratio of OH/Fe was 1.5,the adsorption capacity of OH/Fe-Mont to ZEA reaches the maximum (0.283 mg/g),which was 5 times of that of the K10-Mont(0.054 mg/g). The result of XRD analysis shows that the d001 of hydroxyl-Fe intercalated montmorillonite increased after mod-ification.The increment of interlayer space of montmorillonite made the adsorption amount increase.(2)Freun-dlich model could well fit the adsorption isotherms of zearalenone by both OH/Fe-Mont and K10-Mont.FT-IR analysis shows that cationic exchange was the dominant mechanism for ZEA entering montmorillonite interlay-er.(3)For sorption of Zearalenone by both OH/Fe-Mont and K10-Mont,the optimum adsorption conditions of pH was 8,the optimum temperature was 35 ℃.(4)A pseudo-second-order kinetic model could well fit the da-ta,the correlation coefficient (R2 )of two adsorbents were more than 0.99.Both initial rate and equilibrium ad-sorption amount of 1.5OH/Fe-Mont were higher than the K10-Mont.
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