Increased As Adsorption on Maghemite-Containing Red Mud Prepared by the Alkali Fusion-Leaching Method
| Autor: | A. A. Shoppert, K. A. Karimov, D. A. Rogozhnikov, L. I. Chaikin, I. V. Loginova |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
BAUXITE
magnetic nanoparticles ADSORPTION Materials science lcsh:QE351-399.2 0211 other engineering and technologies Fluorescence spectrometry red mud chemistry.chemical_element Maghemite MAGHEMITE 02 engineering and technology 010501 environmental sciences engineering.material 01 natural sciences chemistry.chemical_compound Adsorption Specific surface area alkali fusion-leaching parasitic diseases RED MUD Arsenic ARSENATE 021102 mining & metallurgy 0105 earth and related environmental sciences MAGNETIC NANOPARTICLES lcsh:Mineralogy ALKALI FUSION-LEACHING Arsenate Geology Geotechnical Engineering and Engineering Geology bauxite Red mud maghemite Bauxite chemistry adsorption engineering arsenate Nuclear chemistry |
| Zdroj: | Minerals, Vol 9, Iss 1, p 60 (2019) Minerals Volume 9 Issue 1 |
| Popis: | This study investigates the use of red muds as adsorbents for As (V) removal. Red mud is a waste that contains a large amount of iron oxides and hydroxides, which are excellent adsorbents of arsenic, especially those possessing magnetic properties and a large specific surface area. The purpose of the experiments was to study the possibility of obtaining an effective adsorbent by the direct extraction of alumina from bauxite using the caustic alkali fusion method and to compare the arsenic removal effectiveness and other properties of these red muds with industrial samples. Red muds were described using methods such as X-ray diffraction spectrometry (XRD), X-ray fluorescence spectrometry (XRF), SEM, vibrating sample magnetometry (VSM), and the Brunauer&ndash Emmett&ndash Teller (BET) method. The main iron-containing phase of the red muds obtained by fusing bauxite with caustic alkali is maghemite, which has a large specific surface area. The specific surface area of the obtained samples varied in the range of 6.1&ndash 54.9 m2/g. Arsenic adsorption experiments were carried out using five different types of red muds: industrial Bayer, industrial sintering, and red mud obtained through bauxite alkali fusion at 300, 500, and 700 ° C. The red muds obtained by fusing bauxite with caustic alkali at 300 and 500 ° C had the highest effectiveness removing arsenic their As(V) uptake capacity was over 30 mg/g. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |