Comparative Study for Removal of Imidacloprid and Oxamyl Pesticides by Cement Kiln Dust: Kinetics and Equilibrium Studies

Document Type : Original Article

Authors

1 Department of Soil & Water Science, Faculty of Desert and Environmental Agriculture, Matrouh University, Egypt

2 National Institute of Oceanography and Fisheries (NIOF), Egypt

Abstract

This study investigated the removal of imidacloprid (IMI) and oxamyl (OX) pesticides by cement kiln dust (CKD) as industrial by-products. CKD was identified by elements composition, Fourier- transform infrared (FTIR), and scanning electron microscopy (SEM). Effects of initial concentration (100–2000 mg/L), and contact time (10–360 min)were investigated. The kinetic results of IMI and OX pesticides were fitted to pseudo-first-order, pseudo-second-order, and intra-particle diffusion equations. The pseudo-second-order kinetic model fitted well for IMI removal, while pseudo-first-order kinetic model flitted to OX removal results. Isotherm results were examined by different isotherm models (Freundlich, Langmuir, and Temkin equations). The results fitted well with the Langmuir isotherm model (R2=0.988 and 0.999) with maximum adsorption capacity of 142.85 and 100.00 mg/g for IMI and OX pesticide removal by CKD, respectively. The obtained results indicated the potential of using CKD as an efficient and, low-cost adsorbent for the removal of IMI and OX pesticides from aqueous solutions.
 

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Alexandria Science Exchange Journal
Volume 43, Issue 3 - Serial Number 3
JULY-SEPTEMBER
September 2022
Pages 459-470

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