Adsorption of As(III) versus As(V) from aqueous solutions by cerium-loaded volcanic rocks
| Autor: | Dejene A. Tessema, Gijs Du Laing, Tsegaye Girma Asere, Fekadu Fufa, Christian V. Stevens, Kim Verbeken |
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| Rok vydání: | 2017 |
| Předmět: |
Arsenites
Surface Properties Health Toxicology and Mutagenesis Inorganic chemistry Mineralogy chemistry.chemical_element Portable water purification Volcanic Eruptions 02 engineering and technology 010501 environmental sciences 01 natural sciences Redox Water Purification Adsorption Environmental Chemistry Freundlich equation Arsenic 0105 earth and related environmental sciences Aqueous solution Silicates Sorption Cerium General Medicine Models Theoretical 021001 nanoscience & nanotechnology Pollution Solutions chemistry Arsenates 0210 nano-technology Oxidation-Reduction Water Pollutants Chemical |
| Zdroj: | Environmental Science and Pollution Research. 24:20446-20458 |
| ISSN: | 1614-7499 0944-1344 |
| DOI: | 10.1007/s11356-017-9692-z |
| Popis: | Contamination of drinking water with arsenic causes severe health problems in various world regions. Arsenic exists predominantly as As(III) and As(V) depending on the prevailing redox conditions of the environment. Most of the techniques developed for treating As(V) are not very effective for As(III), which is more toxic and mobile than As(V). In this study, novel cerium-loaded pumice (Ce-Pu) and red scoria (Ce-Rs) adsorbents were developed to remove both As(III) and As(V) ions from water. The Ce-Pu and Ce-Rs adsorbents were characterized using ICP-OES, EDX, and SEM. The experimental equilibrium sorption data fitted well Freundlich and Dubinin-Radushkevich (D-R) isotherms. The adsorption was very fast and reached an equilibrium within 2 h. Both Ce-Rs and Ce-Pu showed high As(III) and As(V) removal efficiency in a wide pH range between 3 and 9, which is an important asset for practical applications. The Ce-Pu and Ce-Rs adsorbents can be recycled and used up to three adsorption cycles without significant loss of their original efficiency. Accordingly, Ce-Pu and Ce-Rs seem to be suitable for removal of arsenic from aqueous systems. |
| Databáze: | OpenAIRE |
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