Document Type : Original Research
Authors
1
Natural resources- institute of african researches and studies - Aswan university - Aswan - Egypt
2
Chemistry Department, Faculty Of Science, Aswan University - Aswan - Egypt
3
Natural Resources Department, Institute of African and Nile States Researches and Studies, Aswan University - Aswan - Egypt
4
Botany Department, Faculty of science, Aswan University, Aswan, Egypt
Abstract
Due to their non-biodegradable and tendency to bioaccumulate, heavy metals pose a significant danger to aquatic ecosystems. The purpose of this study is preparation of peanutshell biosorbent and investigation of the efficacy of this adsorbent in the heavy metals ( Pb and Fe ) removal of from polluted water. The peanut shell adsorbent was prepared by 1- physical activation by calcination at 300ᵒC , 500ᵒC and 800ᵒC, 2- chemical activation by 1M HCl, H3PO4 and NaOH , and 3- physical activation followed by chemical activation. The adsorption test results for Pb and Fe showed that the adsorbent prepared by calcination at 800°C followed by chemical treatment with 1M NaOH showed higher Pb and Fe removal than with the other activators. The selected adsorbent was analyzed using XRD , SEM, EDX , BET, and FTIR. High removal efficiency of Pb ions adsorption were50 mg/l metal concentration, pH 5, solution temperature 323ᵒk, contact time 30 min, and 0.5g adsorbent dose, while that for Fe removal it was observed at 50 mg/l metal concentration, pH 5, temperature 303ᵒk, contact time 90 min, and 0.1 g of adsorbent. Adsorption of Pb and Fe ions were found to be well fit to Langmuir and Freundlich isotherms, and the pseudo second order kinetic model for both heavy metals . Pb and Fe adsorption on the prepared adsorbent was endothermic and spontaneous process . The resulted absorbent was successfully applied for the removal of Pb and Fe ions from water of Lake Nasser and Lake Nubia.
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