不同层电荷数钙蒙脱石对黄曲霉毒素B1的吸附性能与机理研究

摘要/Abstract

摘要： 以内蒙古、新疆及辽宁三地的钙基膨润土为研究对象,探究不同层电荷数钙蒙脱石对黄曲霉毒素B₁(AFB₁)的吸附性能与机理。采用X射线衍射仪、红外光谱仪、高效液相色谱仪等测试手段,研究不同产地膨润土的矿物学属性、理化性能及钙蒙脱石吸附AFB₁的动力学和等温吸附作用。结果表明,钙蒙脱石含量高、比表面积大、层电荷数高的内蒙古膨润土(N-Mt)吸附性能较好,当初始浓度为1.5 mg/L、吸附剂用量为5 mg时,N-Mt对AFB₁的饱和吸附量为1.153 mg/g,吸附过程受pH值影响较小。钙蒙脱石对AFB₁的吸附行为同时符合准一级动力学模型和准二级动力学模型,表明吸附过程可能同时涉及物理吸附和化学吸附。钙蒙脱石与AFB₁之间的吸附作用同时发生在层间域和层面上,该作用主要源于电子供体-受体结合作用和钙蒙脱石与AFB₁分子之间的离子-偶极相互作用。钙蒙脱石对AFB₁的等温吸附符合Langmuir模型,属单分子层吸附。

关键词: 膨润土, 蒙脱石, 层电荷, 黄曲霉毒素B₁, 吸附性能, 吸附机理

Abstract: The adsorption properties and mechanism of AFB₁ on Ca-montmorillonite with different layer charge numbers were studied by using Ca-bentonite from Inner Mongolia, Xinjiang and Liaoning as the research object. The mineralogical properties, physical and chemical properties of bentonite from different producing areas and the adsorption kinetics and isothermal adsorption of AFB₁ by Ca-montmorillonite were studied by using X-ray diffractometer, infrared spectroscopy, high performance liquid chromatography and other testing methods. The results show that the bentonite from Inner Mongolia(N-Mt) with high Ca-montmorillonite content, large specific surface area and high layer charge numbers has better adsorption properties. When the initial concentration is 1.5 mg/L and the amount of adsorbent is 5 mg, the saturated adsorption capacity of AFB₁ is 1.153 mg/g, and the adsorption process is less affected by pH value. The adsorption behavior of AFB₁ on Ca-montmorillonite conforms to both the pseudo-first-order kinetic model and the pseudo-second-order kinetic model, which indicates that the adsorption process may involve both physical adsorption and chemical adsorption, and the adsorption between Ca-montmorillonite and AFB₁ occurs at both interlayer and interlayer levels. The adsorption between Ca-montmorillonite and AFB₁ is mainly due to electron donor-acceptor binding and ion-dipole interaction between Ca-montmorillonite and AFB₁ molecules. The isothermal adsorption of AFB₁ by Ca-montmorillonite is more in line with the Langmuir model, which is a monolayer adsorption.

Key words: bentonite, montmorillonite, layer charge, AFB₁, adsorption property, adsorption mechanism

中图分类号:

肖莎, 彭同江, 孙红娟, 张伟. 不同层电荷数钙蒙脱石对黄曲霉毒素B₁的吸附性能与机理研究[J]. 硅酸盐通报, 2024, 43(1): 172-182.

XIAO Sha, PENG Tongjiang, SUN Hongjuan, ZHANG Wei. Adsorption Properties and Mechanism of Ca-Montmorillonite with Different Layer Charge Numbers on AFB[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 172-182.

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不同层电荷数钙蒙脱石对黄曲霉毒素B₁的吸附性能与机理研究

Adsorption Properties and Mechanism of Ca-Montmorillonite with Different Layer Charge Numbers on AFB

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