The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent

Milica Karanac; Maja Đolić; Đorđe Veljović; Vladana Rajaković-Ognjanović; Zlate Veličković; Vladimir Pavićević; Aleksandar Marinković

doi:10.1016/j.wasman.2018.05.052

The removal of Zn²⁺, Pb²⁺, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent

Waste Manag. 2018 Aug:78:366-378. doi: 10.1016/j.wasman.2018.05.052. Epub 2018 Jun 22.

Authors

Milica Karanac¹, Maja Đolić², Đorđe Veljović³, Vladana Rajaković-Ognjanović⁴, Zlate Veličković⁵, Vladimir Pavićević³, Aleksandar Marinković³

Affiliations

¹ Innovation Center of the Faculty of Technology and Metallurgy Ltd. In Belgrade, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia. Electronic address: mkaranac@tmf.bg.ac.rs.
² Vinča Institute of Nuclear Sciences, University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia.
³ Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000 Belgrade, Serbia.
⁴ Faculty of Civil Engineering, University of Belgrade, Bulevar Kralja Aleksandra 73, 11000 Belgrade, Serbia.
⁵ Military Academy, 33 General Pavle Jurišić-Šturm Street, 11000 Belgrade, Serbia.

PMID: 32559923
DOI: 10.1016/j.wasman.2018.05.052

Abstract

This study focuses on the use of raw fly ash (FA) and modified fly ash - activated by lime (MFA), as effective and low-cost adsorbents for the removal of heavy metals (Zn²⁺, Pb²⁺ and As(V)), followed by the revalorization of the exhausted adsorbent. The granulometric, elemental analysis, point of zero charge (pH_PZC), radiochemical and structural characterization were conducted using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and gamma spectrometry techniques. The optimal conditions and key factors influencing the adsorption process were assessed using the response surface method (RSM). The adsorption capacity of the MFA adsorbent for Zn²⁺, Pb²⁺ and As(V) removal, calculated by the Langmuir model, was found to be 33.13, 26.06, and 29.71 mg g^-1, respectively. The kinetic and thermodynamic parameters indicated that the adsorption process is spontaneous and endothermic. Due to their low desorption potential of the exhausted adsorbents, their effective reuse was established to be feasible. For this reason, the valorization of this material as an additive in construction materials was thereafter studied, where testing its toxicity leaching (TCLP) as well as the mechanical properties of construction material containing exhausted MFA confirmed its safe use. Hence, this study points to a possible "two-in-one" reuse of coal ash, initially as an adsorbent and later as an additive in a construction material.

Keywords: (Re)valorization of waste material; Chemical activation; Construction material; Fly ash/Ca(OH)(2).