氯化十六烷基吡啶改性蒙脱石对赭曲霉毒素A的吸附效果及机理  

Adsorption Effect and Mechanism of Cetylpyridine Chloride Modified Montmorillonite on Ochratoxin A

作　　者：雷洁 孙红娟[1,3] 彭同江[1,2,3] 白轩豪 LEI Jie;SUN Hongjuan;PENG Tongjiang;BAI Xuanhao(School of Environment and Resources,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China;Key Laboratory of Solid Waste Treatment and Resource Recycling of Ministry of Education,Mianyang 621010,Sichuan,China;Institute of Mineral Materials and Application,Southwest University of Science and Technology,Mianyang 621010,Sichuan,China)

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010 [2]固体废物处理与资源化教育部重点实验室,四川绵阳621010 [3]西南科技大学矿物材料及应用研究所,四川绵阳621010

出　　处：《硅酸盐学报》2024年第10期3150-3158,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(42072048);中国建筑材料工业地质勘查中心揭榜挂帅专项资助(建地科[2022]05号)。

摘　　要：赭曲霉毒素A (OTA)常见于霉变饲料中,动物食用后会严重损害其身体机能;蒙脱石具有良好的吸附性能,常用作吸附剂,具有保护动物胃肠粘膜的作用。使用氯化十六烷基吡啶(CPC)改性蒙脱石,通过X射线衍射、红外光谱、润湿接触角等揭示改性前后蒙脱石的层间距、官能团和亲疏水性的变化规律,并对比蒙脱石改性前后对OTA的吸附效果。结果表明:CPC成功进入蒙脱石层间且疏水性提升;改性后的蒙脱石(CPC-Mt)对OTA的吸附率高于未改性的蒙脱石。CPC-Mt对OTA的吸附动力学和等温线表明:CPC-Mt吸附OTA符合准二级动力学吸附模型和Linear等温线模型,说明CPC-Mt对OTA以化学吸附为主,且满足吸附/分配模型。根据等温线结果提出吸附机理,CPC-Mt与OTA主要以疏水和静电作用相结合。Introduction Mycotoxins are secondary metabolites with a high toxicity produced by fungi and widely exist in feeding,thus reducing feed quality and affecting human-being and animal health.Montmorillonite as a feed additive can effectively reduce the risk of mycotoxin absorption by organisms,but its surface is highly hydrophilic,and the binding rate with weak/non-polar mycotoxins(such as OTA)is low.In this paper,OTA/montmorillonite composite adsorption material(i.e.,CPC-MT)was prepared with pyridine salt CPC as a modifier.Its structure before and after montmorillonite modification was analyzed.The OTA adsorption behavior of modified montmorillonite was investigated through batch adsorption experiments combined with kinetic and isothermal adsorption models,so as to provide a technical scheme for effective adsorption of mycotoxins in feed.Methods Cetylpyridine chloride(CPC)modified montmorillonite was prepared in water bath under stirring.The modified product was obtained by centrifugal washing,drying,grinding and sieving.The layer spacing,functional groups and hydrophilicity(i.e.,contact angle)of montmorillonite before and after modification were determined by X-ray diffraction(XRD),Fourior tranform infrared spectroscopy(FTIR)and contact angle measurement.In a simulated body fluid environment at different pH values,the adsorption effect of montmorillonite on OTA before and after modification was analyzed,and the adsorption mechanism was further discussed through adsorption kinetics and adsorption isotherm.Results and discussion The XRD analysis shows that the crystal surface spacing of montmorillonite after CPC modification gradually increases from 1.25 nm to 1.52 nm with the increase of the amount of modifie.The layer spacing of montmorillonite at 1.5 CEC is the maximum,and gradually shifts to a lower angle as the amount of modifier increases.These results indicate that the long carbon chains entering the interlayer or CPC of CP+after ion exchange with the interlayer cations of montmorillonite are combined with mo

关 键 词：蒙脱石 有机改性 赭曲霉毒素A 吸附动力学 

分 类 号：S816[农业科学—饲料科学]