Efficient multistep arsenate removal onto magnetite modified fly ash
Authorized Users Only
Đolić, Maja B.
Veličković, Zlate S.
Ivanovski, Valentin N.
Marinković, Aleksandar D.
Article (Published version)
© 2018 Elsevier Ltd
MetadataShow full item record
The modification of the fly ash (FA) by magnetite (M) was performed to obtain FAM adsorbent with improved adsorption efficiency for arsenate removal from water. The novel low cost adsorbents are characterized by liquid nitrogen porosimetry (BET), scanning electron microscopy (SEM), X-ray diffraction (XRD), Mössbauer spectroscopy (MB) and Fourier transform infrared (FTIR) spectroscopy. The optimal conditions and key factors influencing the adsorbent synthesis are assessed using the response surface method (RSM). The adsorption experiment was carried out in a batch system by varying the contact time, temperature, pH, and mass of the adsorbent. The adsorption capacity of the FAM adsorbent for As(V), calculated by Langmuir model, was 19.14 mg g−1. The thermodynamic parameters showed spontaneity of adsorption with low endothermic character. The kinetic data followed the pseudo-second-order kinetic model (PSO), and Weber-Morris model indicated intra-particle diffusion as rate limiting step. ...Alternative to low desorption capability of the FAM was found by five consecutive adsorption/magnetite precipitation processes which gave exhausted layered adsorbent with 65.78 mg g−1 capacity. This research also has shed light on the mechanism of As(V)-ion adsorption, presenting a promising solution for the valorization of a widely abundant industrial waste. © 2018 Elsevier Ltd
Keywords:Adsorption / Arsenate / fly ash / Magnetite
Source:Journal of Environmental Management, 2018, 224, 263-276
- Cleaner production: power plant wastewater treatment process development (RS-34009)
- Synthesis, processing and applications of nanostructured multifunctional materials with defined properties (RS-45019)
- Investigation of intermetallics and semiconductors and possible application in renewable energy sources (RS-171001)
ISSN: 0301-4797 (print); 1095-8630 (electronic)