Nature Environment and Pollution Technology

Lingfeng Zhu ¹, Yixue He ¹, Yujie Guo ¹, Xi Chen ¹, Guoting Li ¹

Affiliations
1 Department of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, CN

Abstract

In order to enhance the adsorption performance of TiO₂, CeO₂ was tentatively introduced into the matrix of TiO₂ by sol-gel method. The prepared adsorbent CeO₂-TiO₂ was used for the efficient adsorptive removal of antibiotics tetracycline (TC). It was observed that the introduction of CeO₂ into TiO₂ matrix has improved the removal efficiency of TC by 57.6% compared to pure TiO₂. The uptake of TC was highly dependent on the solution pH conditions and the highest uptake of TC occurred under alkaline condition. Linear simulation method failed to discern which kinetic model was better to describe the kinetic data between pseudo-first-order and pseudo-second-order models. By nonlinear simulation, Elovich kinetic model was found to be the best model to describe the TC adsorption onto CeO₂-TiO₂, indicating that the pronounced diffusion-control process was the rate-determining step. The maximal adsorption capacity of the prepared sorbent was 59.3 mg/g using Langmuir isotherm model at 298 K. The uptake of TC increased with an increase in the reaction temperature, which demonstrates that the adsorption of TC was endothermic.

Keywords

CeO₂-TiO₂, Tetracycline, Adsorption, Kinetics, Isotherm.

Full Text