Application of magnesite–bentonite clay composite as an alternative technology for removal of arsenic from industrial effluents
| Autor: | Hlanganani Tutu, Vhahangwele Masindi, Mugera W. Gitari, Marinda De Beer |
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| Rok vydání: | 2014 |
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| Zdroj: | Toxicological & Environmental Chemistry. 96:1435-1451 |
| ISSN: | 1029-0486 0277-2248 |
| DOI: | 10.1080/02772248.2014.966714 |
| Popis: | This study evaluated the feasibility of integrating amorphous magnesite and bentonite clay (composite) as an alternative technology for removing arsenic from industrial effluents. The removal of arsenic from industrial effluents by using magnesite–bentonite clay composite was carried out in batch mode. The effects of equilibration time, adsorbent dosage, adsorbate concentration, and pH on removal of arsenic were investigated. The experiments demonstrated that ≈100% arsenic removal is optimum at 30 minutes of agitation, 2 g of adsorbent dosage (2 g: 100 mL, S/L ratio), and 20 mg L−1 of arsenic concentration. The adsorption data fitted well to both Langmuir and Freundlich adsorption models, hence proving monolayer and multilayer adsorption. The kinetic studies revealed that the data fitted better to a pseudo-second-order reaction than to a pseudo-first-order reaction, hence proving chemisorption. At optimized conditions, the composite was able to remove arsenic to below World Health Organization water quali... |
| Databáze: | OpenAIRE |
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