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Abstract <p>The kinetics of photocatalytic decomposition of rhodamine B dye in aqueous solutions with initial concentrations of 20, 25, 30, 35, and 40 mg/L was studied using a TiO<sub>2</sub>–montmorillonite composite photocatalyst with high adsorption capacity and photoactivity. The experimental data were analyzed based on the pseudo-second-order and Langmuir–Hinshelwood (L–H) models. In all cases, the apparent reaction order was less than unity, and the half-life of the dye molecules increased monotonically with increasing dye concentration in the solution. Based on the Langmuir adsorption isotherm obtained for the “dark” period, the equilibrium adsorption constant <i>K</i><sub>L</sub> was determined, which is in good agreement with the adsorption parameter <i>K</i><sub>a</sub> of the L–H model, indicating the adequacy of this model for photocatalysts with high adsorption capacity. The use of equations representing the analytical solution of the L–H equation based on perturbation iteration method algorithms makes it possible to solve the direct kinetic problem for a photocatalytic experiment with high accuracy.</p>

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Kinetic Aspects of Photocatalytic Decomposition of Rhodamine B in an Aqueous Solution Using a TiO2–Montmorillonite Composite

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • N. L. Ovchinnikov,
  • D. V. Yashin,
  • D. S. Selishchev,
  • M. F. Butman

摘要

Abstract

The kinetics of photocatalytic decomposition of rhodamine B dye in aqueous solutions with initial concentrations of 20, 25, 30, 35, and 40 mg/L was studied using a TiO2–montmorillonite composite photocatalyst with high adsorption capacity and photoactivity. The experimental data were analyzed based on the pseudo-second-order and Langmuir–Hinshelwood (L–H) models. In all cases, the apparent reaction order was less than unity, and the half-life of the dye molecules increased monotonically with increasing dye concentration in the solution. Based on the Langmuir adsorption isotherm obtained for the “dark” period, the equilibrium adsorption constant KL was determined, which is in good agreement with the adsorption parameter Ka of the L–H model, indicating the adequacy of this model for photocatalysts with high adsorption capacity. The use of equations representing the analytical solution of the L–H equation based on perturbation iteration method algorithms makes it possible to solve the direct kinetic problem for a photocatalytic experiment with high accuracy.