Sundhararasu, Elavarasi; Tuomikoski, Sari; Runtti, Hanna; Hu, Tao; Varila, Toni; Kangas, Teija; Lassi, Ulla. 2021. "Alkali-Activated Adsorbents from Slags: Column Adsorption and Regeneration Study for Nickel(II) Removal" ChemEngineering 5, no. 1: 13. https://doi.org/10.3390/chemengineering5010013
Alkali-activated adsorbents from slags : column adsorption and regeneration study for nickel(II) removal
|Author:||Sundhararasu, Elavarasi1; Tuomikoski, Sari1; Runtti, Hanna1;|
1Research Unit of Sustainable Chemistry, University of Oulu, P.O. Box 4300, 90570 Oulu, Finland
2Unit of Applied Chemistry, Kokkola University Consortium Chydenius, University of Jyvaskylä, Talonpojankatu 2B, FI-67100 Kokkola, Finland
|Online Access:||PDF Full Text (PDF, 2.5 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe202103086760
Multidisciplinary Digital Publishing Institute,
|Publish Date:|| 2021-03-08
Alkali-activated adsorbents were synthesized by mixing three different slags from the steel industry: blast furnace slag (BFS), ladle slag (LS), and Lintz–Donawitz converter slag (LD). These powdered slag-based geopolymers (GP) were used to remove nickel(II) from aqueous solutions in fixed-bed column studies. The experiments were conducted in pH 6 using a phosphate buffer with initial nickel(II) concentration of 50 mg/L. Samples were taken at time intervals of between 5 and 90 min. Three adsorption–desorption cycles were implemented with a flow rate of 5 mL/min. The geopolymers were characterized by Fourier-Transform Infrared Spectroscopy (FTIR), X-ray powder diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), X-ray fluorescence (XRF), specific surface area measurements, and a leaching test. The data were found to describe the Thomas, Adams–Bohart, and Yoon–Nelson models well. For GP (BFS, LS), experimental adsorption capacity was 2.92 mg/g, and for GP (LD, BFS, LS), it was 1.34 mg/g. The results indicated that the produced adsorbents have the potential to be used as adsorbents for the removal of nickel(II).
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
116 Chemical sciences
This research was funded by Maa-ja Vesitekniikan tuki ry. This work was conducted under the auspices of the Waterpro (ERDF project number: A74635, funded by the European Union, European Regional Development Fund and Leverage from the EU and Regional Councils).
© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).