Research on the adsorption of Cr3+ and Cr6+ by the cracked products of β-cyclodextrin

Abstract

Abstract β-cyclodextrin (β-CD) was used as raw material at different temperatures (300°C, 500°C and 700°C) the adsorption properties of β-cyclodextrin on Cr3+ and Cr6+ were researched by kinetic adsorption and isothermal adsorption. The maximum adsorption capacity and adsorption rate of β-cyclodextrin on Cr3+ and Cr6+ were compared, which provided a theoretical basis for the preparation of efficient adsorbents and the prediction of their adsorption properties on Cr3+ and Cr6+. The results show that the adsorption rate of Cr3+ and Cr6+ by β-cyclodextrin cracking products is in accordance with the Quasi First-order Kinetic model. The adsorption rate of Cr3+ by β-CD300 and β-CD500 is the same and higher than that by β-CD700. The adsorption rate of Cr6+ by β-CD300 is faster. The isotherm adsorption curves of Cr3+ and Cr6+ on β-cyclodextrin cracking products are in accordance with the Langmuir equation. The maximum adsorption capacity of Cr3+ is higher than that of Cr6+, and the maximum adsorption capacity of β-CD500 for Cr3+ and Cr6+ is 1151. 77m/g and 440. 78mg/g.