有机改性蒙脱土吸附黄曲霉毒素B1能力的研究

利用十八烷基三甲基溴化铵(OTMAB)作为有机改性剂对钠基蒙脱土(Na-MMT)进行改性,以提高对黄曲霉毒素B1(AFB1)的吸附能力。改性后的钠基蒙脱土利用X-射线衍射(XRD)、傅立叶变换红外光谱(FTIR)、扫描电镜(SEM)及热失重分析(TGA)等方法对其结构特性进行研究。结果表明,改性剂OTMAB插入到钠基蒙脱土的夹层内并扩大了其夹层间距(d_(0.01)),增大了其比表面积。改性蒙脱土对AFB1的吸附等温线符合Langmuir数学模型。有机改性Na-MMT对AFB1的最大吸附量(q_(max))为34.25 mg/g,Langmuir吸附常数(k)为3.65L/mg,均高于未改性的Na-MMT(q_(max)=28.74mg/g和k=2.37L/mg),说明有机改性能够有效提高Na-MMT对AFB1的吸附能力。

Research on adsorption capacity of organically modified Na-montmotillonite for Aflatoxin B1

Na-montmotillonite (Na-MMT) was organically modified using Octadecy Trimethyl Ammonium Bromide (OTMAB) as a modifier to improve its adsorption capacity of aflatoxin B₁ (AFB₁). The modified Na-MMT is characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Scanning electron microscopy (SEM), and Thermogravimetric analysis (TGA). The results showed that the OTMAB was intercalated into the Na-MMT, expanded its interlayer spacing (d_0.01), and increased its specific surface area. The adsorption isotherm of AFB₁ on the modified Na-MMT is followed the Langmuir equation. The maximum adsorption capacity (q_max) and the Langmuir adsorption coefficient (k) of modified Na-MMT for AFB₁ were 34.25 mg/g and 3.65 L/mg, respectively, which were both larger than those of Na-MMT (i.e. q_max=28.74 mg/g, k=2.37 L/mg), indicated that the organic modification could increase the adsorption capacity of Na-MMT for AFB₁.