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

Abstract

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

CLC Number:

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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