PREPARATION OF BIOSORBENT FROM LETTUCE LEAVES MODIFIED WITH NaOH AND EDTA FOR THE REMOVAL OF Pb2+ IONS FROM WASTEWATER

Abstract

In this work, we prepared the LC/NaOH-EDTA biosorbent by surface modification method using NaOH and Ethylenediaminetetraacetic acid (EDTA). The characteristics of the biosorbent were defined utilizing X–Ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), N₂ adsorption/desorption isotherms, zeta potential, and Energy-dispersive (EDS) measurements. The produced biosorbent exhibited excellent Pb²⁺ ions removal ability in water. Under the optimal modified conditions including LC/NaOH-EDTA mass of 1.0 g/L, medium pH of 6, and Pb²⁺ concentration of 80 mg/L, the Pb²⁺ ion removal efficiency on the LC/NaOH-EDTA reached 91.22 % with a biosorption constant of 0.029 g.mg^-1.min^-1. In addition, the reusability of the biosorbent was also studied and the adsorption mechanism was proposed