Adsorption of Lead and Arsenic Ions from Aqueous Solution by Activated Carbon Prepared from Tamarix Leaves

Abstract

Lead and arsenic are regarded as the significant heavy metal ions which have a great contribution in the pollution of industrial wastewaters. In this research, the adsorption of Pb (II) and As (III) ions from the aqueous solution was studied using activated carbon prepared from Tamarix leaves as a new adsorbent. The adsorbent was characterized by Brunauer, Emmett, and Teller (BET), X‐ray fluorescence spectrometer (XRF), scanning electron microscope (SEM), energy dispersive X‐ray and mapping (EDX/Map), X‐ray diffraction (XRD), and Raman techniques. Batch experiments were designed to investigate the significance of adsorption parameters including pH, adsorbent dosage, time, temperature, and initial concentration on Pb and As ions removal efficiencies. The experiments indicated that the highest adsorption efficiencies were 97.86% for lead and 96.18% for arsenic ions in pH values of 6 for Pb and 7 for As, adsorbent dosage of 3 g/L and initial concentration of 10 mg/L for both of them, and contact time of 60 min and 40 min for Pb and As ions, respectively. Additionally, the results of adsorption kinetics showed that the pseudo second‐order model was more effective for the description of adsorption mechanism of both metals compared to the pseudo first‐order model. The equilibrium behavior of arsenic and lead ions were described well by Langmuir and Freundlich models, respectively. In addition, thermodynamic studies showed that the current adsorption processes were exothermic and spontaneous. Based on the results, the prepared adsorbent can be considered as a good adsorbent for the removal of Pb and As ions from aqueous solutions.

Lead adsorption in a serpentine millichannel‐based packed‐bed device: Effect of hydrodynamics and mixing characteristics

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“…In the present study, graphene oxide (GO) was utilized as the adsorbent to remove the Pb(II), as the GO contains various kinds of nitrogen or oxygen‐containing functional groups, which can take part in the formation of the covalent bonds with the metal ions. According to the previous literature, the batch processes of the Pb(II) adsorption are advantageous concerning its safe and easy operation, but it demands higher energy and a more extended time 5‐16 . Compared to the batch process, the continuous process is cost‐effective and efficient.…”

Use of Chemically Treated Human Hair Wastes for the Removal of Heavy Metal Ions from Water

“…Various materials have been developed as adsorbents for the removal of heavy metal ions. In particular, activated carbon is frequently used as an adsorbent due to its high surface area, high adsorption capacity, and high degree of surface reactivity [6]. However, activated carbon is relatively expensive and is difficult to recycle by eluting the heavy metal ions because of the strong interaction between activated carbon and heavy metal ions.…”

Investigation of Mechanisam of Metal Ion Adsorption From Aqueous Solutions Using Prosopis Julyflora Roots: Batch and Fixed Bed Column Studies

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