University of Oulu

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.

Alkali-activated adsorbents from slags : column adsorption and regeneration study for nickel(II) removal

Saved in:
Author: Sundhararasu, Elavarasi1; Tuomikoski, Sari1; Runtti, Hanna1;
Organizations: 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
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.5 MB)
Persistent link:
Language: English
Published: Multidisciplinary Digital Publishing Institute, 2021
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).

see all

Series: ChemEngineering
ISSN: 2305-7084
ISSN-E: 2305-7084
ISSN-L: 2305-7084
Volume: 5
Issue: 1
Article number: 13
DOI: 10.3390/chemengineering5010013
Type of Publication: A1 Journal article – refereed
Field of Science: 116 Chemical sciences
Funding: 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).
Copyright information: © 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 (