Bentonite-layered double hydroxide composite as potential adsorbent for removal of Abamectin pesticide from wastewater

Abstract

This research study has proposed the preparation of bentonite-supported CuAl-LDH (B-CuAl) via co-precipitation technique with bentonite incorporation. The prepared B-CuAl has been investigated for adsorption of Abamectin pesticides (ABM) from wastewater in batch mode experiments. The prepared B-CuAl structures and morphology were identified by BET, FTIR, XRD and SEM. For the adsorption process, the impact of initial pH, shaking speed, contact time, ABM initial concentration, temperature, adsorbent dosage and particle size as well as, the thermodynamic, isotherm and kinetics have been studied. The Langmuir isotherm model fits the B-CuAl adsorption data better than the Freundlich isotherm model, suggesting mono-layered adsorption phenomena. The kinetics of ABM adsorption are described by a pseudo-second-order model (R2=0.9898). The thermodynamic study revealed that adsorption of ABM onto B-CuAl was spontaneous and endothermic in nature. Furthermore, the regeneration capability and reuse of the prepared adsorbent have been studied. The adsorption efficiency was higher than 86.32%, suggesting that B-CuAl is an excellent adsorbent for effective pesticides removal from wastewater.