Abstract
The novel organic capturing agent was synthesized through the amidation of 2-amino-5-guanidinopentanoic acid anchored on activated carbon with dimercaptosuccinic acid for effective elimination of toxic Pb(II) ions originated from contaminated water. The SH@AGPA@AC was examined by FT-IR, thermo-gravimetric analysis-DTG, scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett Teller (BET), and X-ray photoelectron spectroscopy (XPS). The influence of experimental conditions like pH, adsorption time, initial Pb(II) concentration, and temperature on the performance of Pb(II) capturing was examined. The results revealed that the SH@AGPA@AC adsorbent was successfully fabricated. The kinetics data achieved a quite fit with the pseudo-second-order model. The SH@AGPA@AC obeyed the Langmuir model. The Pb(II) was fully desorbed with HCl (0.1 M) acid and then ready to reuse in the subsequent cycle after rinsing with water with the identical organic moieties of the SH@AGPA@AC. Thus, the SH@AGPA@AC was considered as an achievable and auspicious candidate for Pb(II) elimination from contaminated water with the highest adsorption capacities amount to 116.3 mg/g.