Arsenic release from arsenopyrite weathering in acid mine drainage: Kinetics, transformation, and effect of biochar
Arsenopyrite (FeAsS) oxidative dissolution provides an important source for the occurrence of high arsenic in acid mine drainage (AMD). Biochar is a potent material that can dramatically sequestrate an array of heavy metals in water. However, little is known about the role of biochar on the fate of...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Environment International |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0160412022004858 |
| _version_ | 1811315917665075200 |
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| author | Ling Cen Hongguang Cheng Qingyou Liu Shuai Wang Xi Wang |
| author_facet | Ling Cen Hongguang Cheng Qingyou Liu Shuai Wang Xi Wang |
| author_sort | Ling Cen |
| collection | DOAJ |
| description | Arsenopyrite (FeAsS) oxidative dissolution provides an important source for the occurrence of high arsenic in acid mine drainage (AMD). Biochar is a potent material that can dramatically sequestrate an array of heavy metals in water. However, little is known about the role of biochar on the fate of As from arsenopyrite in AMD. This study investigates the effects of biochar concentrations, AMD acidities, and temperatures on the release of As from arsenopyrite in a simulated AMD over a range of environmentally relevant conditions. Results show that biochar inhibits As release and further acidification without changing the arsenopyrite weathering mechanism. Arsenopyrite is first oxidized to Fe(II), As(III) and S0 and ultimately oxidized to Fe(III), As(V) and SO42-, respectively. Higher concentration, temperature or higher acidity promotes the arsenic release rate. Electrochemical studies showed that biochar inhibited As release and acidification for reduced the charge transfer resistance at the double layer and film resistance at the passivation layer, which was mainly attributed to Fe(III) ions in AMD being adsorbed, oxidized, and As complexed to biochar-Fe-As(V). This study reveals the release mechanism of As from arsenopyrite weathering in AMD and suggests the applicability of biochar in mitigating arsenic pollution and further acidification in sulfide mineral mine drainage. |
| first_indexed | 2024-04-13T11:40:03Z |
| format | Article |
| id | doaj.art-a4d3abecb864484f8c6da7be02d4be0c |
| institution | Directory Open Access Journal |
| issn | 0160-4120 |
| language | English |
| last_indexed | 2024-04-13T11:40:03Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Environment International |
| spelling | doaj.art-a4d3abecb864484f8c6da7be02d4be0c2022-12-22T02:48:20ZengElsevierEnvironment International0160-41202022-12-01170107558Arsenic release from arsenopyrite weathering in acid mine drainage: Kinetics, transformation, and effect of biocharLing Cen0Hongguang Cheng1Qingyou Liu2Shuai Wang3Xi Wang4Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100039, ChinaState Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, ChinaKey Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; Corresponding author.Key Laboratory of High-temperature and High-pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100039, ChinaState Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; University of Chinese Academy of Sciences, Beijing 100039, ChinaArsenopyrite (FeAsS) oxidative dissolution provides an important source for the occurrence of high arsenic in acid mine drainage (AMD). Biochar is a potent material that can dramatically sequestrate an array of heavy metals in water. However, little is known about the role of biochar on the fate of As from arsenopyrite in AMD. This study investigates the effects of biochar concentrations, AMD acidities, and temperatures on the release of As from arsenopyrite in a simulated AMD over a range of environmentally relevant conditions. Results show that biochar inhibits As release and further acidification without changing the arsenopyrite weathering mechanism. Arsenopyrite is first oxidized to Fe(II), As(III) and S0 and ultimately oxidized to Fe(III), As(V) and SO42-, respectively. Higher concentration, temperature or higher acidity promotes the arsenic release rate. Electrochemical studies showed that biochar inhibited As release and acidification for reduced the charge transfer resistance at the double layer and film resistance at the passivation layer, which was mainly attributed to Fe(III) ions in AMD being adsorbed, oxidized, and As complexed to biochar-Fe-As(V). This study reveals the release mechanism of As from arsenopyrite weathering in AMD and suggests the applicability of biochar in mitigating arsenic pollution and further acidification in sulfide mineral mine drainage.http://www.sciencedirect.com/science/article/pii/S0160412022004858ArsenopyriteBiocharAcid mine drainageArsenic transformElectrochemical |
| spellingShingle | Ling Cen Hongguang Cheng Qingyou Liu Shuai Wang Xi Wang Arsenic release from arsenopyrite weathering in acid mine drainage: Kinetics, transformation, and effect of biochar Environment International Arsenopyrite Biochar Acid mine drainage Arsenic transform Electrochemical |
| title | Arsenic release from arsenopyrite weathering in acid mine drainage: Kinetics, transformation, and effect of biochar |
| title_full | Arsenic release from arsenopyrite weathering in acid mine drainage: Kinetics, transformation, and effect of biochar |
| title_fullStr | Arsenic release from arsenopyrite weathering in acid mine drainage: Kinetics, transformation, and effect of biochar |
| title_full_unstemmed | Arsenic release from arsenopyrite weathering in acid mine drainage: Kinetics, transformation, and effect of biochar |
| title_short | Arsenic release from arsenopyrite weathering in acid mine drainage: Kinetics, transformation, and effect of biochar |
| title_sort | arsenic release from arsenopyrite weathering in acid mine drainage kinetics transformation and effect of biochar |
| topic | Arsenopyrite Biochar Acid mine drainage Arsenic transform Electrochemical |
| url | http://www.sciencedirect.com/science/article/pii/S0160412022004858 |
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