Enhancement adsorption of lead and cadmium ions from waste solutions using chemically modified palm fibers

Abstract

Efficiently chemically modified adsorbents based upon palm fibers were prepared through chemical treatments of palm fibers by sulfuric acid (PF-AC), oxalic acid as a chelating agent (PF-Chel), HNO 3 as an oxidizing agent (PF-OX) and Na 2 SO 3 as a reducing agent (PF-Rd). The four produced adsorbents were applied for the removal of Pb(II) and Cd(II) from synthetic waste solutions. The removal capacity of all chemically modified adsorbents has been investigated through the batch tests to determine the optimum parameters for maximum removal. The kinetics and isotherm studies have been applied to identify the adsorption type. All data in this work has been used as determining factors to predict the adsorption process mechanism. The characterization of the surface of the chemically modified adsorbent [FTIR and SEM] was also studied as another contribution to proving the suggested adsorption mechanism. Experimental data were best fitted by Langmuir model while kinetic results were appropriately expressed by the pseudo-second-order model. The results demonstrated the highest capacity values of 56 and 33 mg/g using PF-Rd for both Pb (II) and Cd (II) ions, respectively. Throughout this study, PF-Rd and PF-OX achieved the maximum capacity with the adsorption of both heavy metals.

Ecological risk assessment of metal pollution in the surface sediments of delta region, Egypt

“…Metals are considered hazardous contaminants due to their environmental persistence, biomagnifications, and cumulative behavior as well as their potential adverse effects (Madruga et al, 2014 ; Soliman et al, 2022 ; Ustaoğlu et al, 2020 ). Metal pollution in aquatic environments is caused by a variety of sources, including agricultural runoff, mining and industrial effluents, and domestic sewage (Ali et al, 2019 ; Nour et al, 2022 ; Thabet et al, 2020 ). These metals are distributed across the water, sediments, suspended solids, and biota within aquatic environments, potentially altering ecology and posing health risks to both humans and aquatic organisms (Shaaban, El-Rayis, & Aboeleneen, 2021 ; Shaaban, Tawfik, et al, 2021 ; Yunus et al, 2020 ).…”