DETAILED KINETICS OF TETRACYCLINE ADSORPTION IN AQUEOUS SOLUTION BY PALM SHELL-DERIVED ACTIVAED CARBON
DOI:
https://doi.org/10.11113/jurnalteknologi.v88.25000Abstract
The excessive excretion of antibiotics in wastewater poses significant environmental risks. Adsorption is expected as highly efficient, cost-effective, and sustainable methods for treating these contaminants. This study investigated the adsorption of tetracycline hydrochloride on palm shell derived activated carbon (PSAC) using the advanced pore volume and surface diffusion model (PVSDM). Scanning electron microscopy and N2 adsorption isotherm revealed a highly microporous PSAC with a specific surface area of 852.85 m2 g-1, an average pore diameter of 2.068 nm and a micropore proportion of 0.72. In the developing PVSDM, conventional isotherms (e.g. Langmuir, Freundlich and Redlich-Peterson) and global kinetics models (e.g. pseudo-first order, pseudo-second order and Elovich) were comprehensively analyzed and the most suitable isotherm and global kinetics models were incorporated into the PVSDM. External film diffusion and intraparticle diffusion (IPD) investigation, according to Weber-Morris and Boyd, consistently confirmed strong IPD control. The PVSDM effectively reproduced time-dependent adsorption capacity in batch experiment and was verified by reasonable prediction of the dynamic change of adsorption capacity within the PSAC particle. The determined mass transfer parameters indicated dominant pore volume diffusion with insignificant surface diffusion. This study demonstrates the effectiveness of PVSDM for quantifying mass transfer resistances in adsorption of TC on PSAC, providing valuable insights for the design and optimization of large-scale adsorption equipment for treatment of antibiotics in wastewater.
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