The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent
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2018
Authors
Karanac, MilicaDolić, Maja B.
Veljović, Đorđe
Rajaković-Ognjanović, Vladana
Veličković, Zlate
Pavićević, Vladimir
Marinković, Aleksandar
Article (Published version)
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Show full item recordAbstract
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 potentia...l 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:
Fly ash/Ca(OH)(2) / Chemical activation / (Re)valorization of waste material / Construction materialSource:
Waste Management, 2018, 78, 366-378Publisher:
- Elsevier Ltd
Funding / projects:
- Cleaner production: power plant wastewater treatment process development (RS-34009)
- Advanced technologies for monitoring and environmental protection from chemical pollutants and radiation burden (RS-43009)
DOI: 10.1016/j.wasman.2018.05.052
ISSN: 0956-053X