Removal of arsenic from gold cyanidation process waters by use of cerium-based magnetic adsorbents
Cerium-based magnetic adsorbents (referred to as Fe3O4@CeO2/(OH)x) were synthesised via a simple chemical precipitation method. Scanning electron microscopy – energy dispersive spectrometry (SEM-EDS) showed that the synthesised particles had an average size of approximately 300 nm. The particles con...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Elsevier
2018
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| Online Access: | http://hdl.handle.net/20.500.11937/66725 |
| _version_ | 1848761377326366720 |
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| author | Feng, C. Aldrich, Chris Eksteen, Jacques Arrigan, Damien |
| author_facet | Feng, C. Aldrich, Chris Eksteen, Jacques Arrigan, Damien |
| author_sort | Feng, C. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Cerium-based magnetic adsorbents (referred to as Fe3O4@CeO2/(OH)x) were synthesised via a simple chemical precipitation method. Scanning electron microscopy – energy dispersive spectrometry (SEM-EDS) showed that the synthesised particles had an average size of approximately 300 nm. The particles consisted of crystalline magnetite cores coated with poorly ordered cerium oxide as identified by their X-ray diffraction (XRD) patterns. A saturation magnetization of approximately 40 emu/g was determined by a superconducting quantum interference device (SQUID), making Fe3O4@CeO2/(OH)x easy to separate magnetically. The Brunauer-Emmett-Teller (BET) specific surface area of the final product was approximately 91.38 ± 1.47 m2/g. Systematic adsorption tests showed that both As(III) and As(V) could be rapidly removed by Fe3O4@CeO2/(OH)x with the Langmuir maximum adsorption capacities of 79.1 mg/g for As(III) and 25.5 mg/g for As(V) at a pH value of 9, in arsenic-only solutions. A simultaneous adsorption of 51.2 mg/g for As(III) and As(V) was obtained in simulated process waters from gold cyanidation. 1.0 mol/L NaOH solution was used as a regenerant to investigate the regeneration and reuse of Fe3O4@CeO2/(OH)x, and over 60% of its initial adsorption capacity was retained after five consecutive adsorption–desorption cycles. Therefore, the readily synthesised Fe3O4@CeO2/(OH)x microparticles, with their high degree of magnetic separability and exceptional arsenic adsorption capacity, can be considered a promising arsenic scavenger in certain industrial applications. |
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| format | Journal Article |
| id | curtin-20.500.11937-66725 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:30:42Z |
| publishDate | 2018 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-667252018-08-15T08:10:05Z Removal of arsenic from gold cyanidation process waters by use of cerium-based magnetic adsorbents Feng, C. Aldrich, Chris Eksteen, Jacques Arrigan, Damien Cerium-based magnetic adsorbents (referred to as Fe3O4@CeO2/(OH)x) were synthesised via a simple chemical precipitation method. Scanning electron microscopy – energy dispersive spectrometry (SEM-EDS) showed that the synthesised particles had an average size of approximately 300 nm. The particles consisted of crystalline magnetite cores coated with poorly ordered cerium oxide as identified by their X-ray diffraction (XRD) patterns. A saturation magnetization of approximately 40 emu/g was determined by a superconducting quantum interference device (SQUID), making Fe3O4@CeO2/(OH)x easy to separate magnetically. The Brunauer-Emmett-Teller (BET) specific surface area of the final product was approximately 91.38 ± 1.47 m2/g. Systematic adsorption tests showed that both As(III) and As(V) could be rapidly removed by Fe3O4@CeO2/(OH)x with the Langmuir maximum adsorption capacities of 79.1 mg/g for As(III) and 25.5 mg/g for As(V) at a pH value of 9, in arsenic-only solutions. A simultaneous adsorption of 51.2 mg/g for As(III) and As(V) was obtained in simulated process waters from gold cyanidation. 1.0 mol/L NaOH solution was used as a regenerant to investigate the regeneration and reuse of Fe3O4@CeO2/(OH)x, and over 60% of its initial adsorption capacity was retained after five consecutive adsorption–desorption cycles. Therefore, the readily synthesised Fe3O4@CeO2/(OH)x microparticles, with their high degree of magnetic separability and exceptional arsenic adsorption capacity, can be considered a promising arsenic scavenger in certain industrial applications. 2018 Journal Article http://hdl.handle.net/20.500.11937/66725 10.1016/j.mineng.2018.03.026 Elsevier restricted |
| spellingShingle | Feng, C. Aldrich, Chris Eksteen, Jacques Arrigan, Damien Removal of arsenic from gold cyanidation process waters by use of cerium-based magnetic adsorbents |
| title | Removal of arsenic from gold cyanidation process waters by use of cerium-based magnetic adsorbents |
| title_full | Removal of arsenic from gold cyanidation process waters by use of cerium-based magnetic adsorbents |
| title_fullStr | Removal of arsenic from gold cyanidation process waters by use of cerium-based magnetic adsorbents |
| title_full_unstemmed | Removal of arsenic from gold cyanidation process waters by use of cerium-based magnetic adsorbents |
| title_short | Removal of arsenic from gold cyanidation process waters by use of cerium-based magnetic adsorbents |
| title_sort | removal of arsenic from gold cyanidation process waters by use of cerium-based magnetic adsorbents |
| url | http://hdl.handle.net/20.500.11937/66725 |