Alkali-Activated Adsorbents from Slags: Column Adsorption and Regeneration Study for Nickel(II) Removal
| Autor: | Ulla Lassi, Tao Hu, Teija Kangas, Sari Tuomikoski, Toni Varila, Hanna Runtti, Elavarasi Sundhararasu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
General Chemical Engineering kuona chemistry.chemical_element kinetic models column studies 02 engineering and technology 010501 environmental sciences 01 natural sciences raskasmetallit lcsh:Chemistry Adsorption Specific surface area Fourier transform infrared spectroscopy 0105 earth and related environmental sciences jäteveden käsittely Aqueous solution General Engineering Slag heavy metal 021001 nanoscience & nanotechnology terästeollisuus Nickel wastewater treatment General Energy chemistry jätteiden hyötykäyttö lcsh:QD1-999 Ground granulated blast-furnace slag visual_art visual_art.visual_art_medium geopolymeerit Leaching (metallurgy) 0210 nano-technology nikkeli adsorptio Nuclear chemistry |
| Zdroj: | ChemEngineering, Vol 5, Iss 13, p 13 (2021) ChemEngineering Volume 5 Issue 1 |
| ISSN: | 2305-7084 |
| Popis: | 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). |
| Databáze: | OpenAIRE |
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