Treatment of Acidic Solutions Containing As(III) and As(V) by Sulfide Precipitation: Comparison of Precipitates and Sulfurization Process
Sulfide precipitation has been widely applied to remove arsenic from acidic wastewater containing As(III) and As(V), due to its simple process and high efficiency. However, the characteristics and composition of the precipitates are also of importance for its further treatment and disposal. To explo...
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MDPI AG
2023-04-01
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| Online Access: | https://www.mdpi.com/2075-4701/13/4/794 |
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| author | Hui Xu Yunyan Wang Liwei Yao Yong Ke Yongjian Luo Limin Zhang Jiali Du Lin Yu Junjie Cao Xiaobo Min |
| author_facet | Hui Xu Yunyan Wang Liwei Yao Yong Ke Yongjian Luo Limin Zhang Jiali Du Lin Yu Junjie Cao Xiaobo Min |
| author_sort | Hui Xu |
| collection | DOAJ |
| description | Sulfide precipitation has been widely applied to remove arsenic from acidic wastewater containing As(III) and As(V), due to its simple process and high efficiency. However, the characteristics and composition of the precipitates are also of importance for its further treatment and disposal. To explore the characteristics of elemental S formed by reduction and the combined form of the generated S and As<sub>2</sub>S<sub>3</sub>, the characteristics of precipitates sulfurized from As(III) and As(V) and the effects of temperature, the S(-II) to As ratio (S/As), Cl<sup>−</sup> concentration (c<sub>Cl−</sub>), and the volume fraction of H<sub>2</sub>SO<sub>4</sub> (φ<sub>H2SO4(v)</sub>) on the sulfurization of As(III) and As(V) were investigated in detail. The results showed that the contents of As and S were 60.37% and 39.73% in precipitate-As(III), while they accounted for 47.46% and 52.64% in precipitate-As(V); both precipitate-As(III) and precipitate-As(V) were mainly composed of amorphous As<sub>2</sub>S<sub>3</sub>, while the latter contained elemental S. Temperature and S(-II)/As(III) slightly affected the sulfurization process of As(III), while for As(V), as the temperature increased, the content of As<sub>2</sub>S<sub>3</sub> in precipitate-As(V) increased significantly. Additionally, with the S(-II)/As(V) increasing, the content of A<sub>2</sub>S<sub>3</sub> increased continuously. This study provides a further clarification of the specific composition and structure of the complex precipitates of arsenic sulfide, which will benefit the efficient stabilization of the arsenic sulfide sludge. |
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| language | English |
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| series | Metals |
| spelling | doaj.art-23586379d31a4798b0155dc100e737dc2023-11-17T20:27:47ZengMDPI AGMetals2075-47012023-04-0113479410.3390/met13040794Treatment of Acidic Solutions Containing As(III) and As(V) by Sulfide Precipitation: Comparison of Precipitates and Sulfurization ProcessHui Xu0Yunyan Wang1Liwei Yao2Yong Ke3Yongjian Luo4Limin Zhang5Jiali Du6Lin Yu7Junjie Cao8Xiaobo Min9School of Metallurgy and Environment, Central South University, Changsha 410083, ChinaSchool of Metallurgy and Environment, Central South University, Changsha 410083, ChinaCollege of Resources and Environment, Hunan Agricultural University, Changsha 410128, ChinaSchool of Metallurgy and Environment, Central South University, Changsha 410083, ChinaSchool of Metallurgy and Environment, Central South University, Changsha 410083, ChinaSchool of Metallurgy and Environment, Central South University, Changsha 410083, ChinaSchool of Metallurgy and Environment, Central South University, Changsha 410083, ChinaSchool of Metallurgy and Environment, Central South University, Changsha 410083, ChinaSchool of Metallurgy and Environment, Central South University, Changsha 410083, ChinaSchool of Metallurgy and Environment, Central South University, Changsha 410083, ChinaSulfide precipitation has been widely applied to remove arsenic from acidic wastewater containing As(III) and As(V), due to its simple process and high efficiency. However, the characteristics and composition of the precipitates are also of importance for its further treatment and disposal. To explore the characteristics of elemental S formed by reduction and the combined form of the generated S and As<sub>2</sub>S<sub>3</sub>, the characteristics of precipitates sulfurized from As(III) and As(V) and the effects of temperature, the S(-II) to As ratio (S/As), Cl<sup>−</sup> concentration (c<sub>Cl−</sub>), and the volume fraction of H<sub>2</sub>SO<sub>4</sub> (φ<sub>H2SO4(v)</sub>) on the sulfurization of As(III) and As(V) were investigated in detail. The results showed that the contents of As and S were 60.37% and 39.73% in precipitate-As(III), while they accounted for 47.46% and 52.64% in precipitate-As(V); both precipitate-As(III) and precipitate-As(V) were mainly composed of amorphous As<sub>2</sub>S<sub>3</sub>, while the latter contained elemental S. Temperature and S(-II)/As(III) slightly affected the sulfurization process of As(III), while for As(V), as the temperature increased, the content of As<sub>2</sub>S<sub>3</sub> in precipitate-As(V) increased significantly. Additionally, with the S(-II)/As(V) increasing, the content of A<sub>2</sub>S<sub>3</sub> increased continuously. This study provides a further clarification of the specific composition and structure of the complex precipitates of arsenic sulfide, which will benefit the efficient stabilization of the arsenic sulfide sludge.https://www.mdpi.com/2075-4701/13/4/794sulfurizationprecipitate-As(III)precipitate-As(V)elemental SAs<sub>2</sub>S<sub>3</sub> |
| spellingShingle | Hui Xu Yunyan Wang Liwei Yao Yong Ke Yongjian Luo Limin Zhang Jiali Du Lin Yu Junjie Cao Xiaobo Min Treatment of Acidic Solutions Containing As(III) and As(V) by Sulfide Precipitation: Comparison of Precipitates and Sulfurization Process Metals sulfurization precipitate-As(III) precipitate-As(V) elemental S As<sub>2</sub>S<sub>3</sub> |
| title | Treatment of Acidic Solutions Containing As(III) and As(V) by Sulfide Precipitation: Comparison of Precipitates and Sulfurization Process |
| title_full | Treatment of Acidic Solutions Containing As(III) and As(V) by Sulfide Precipitation: Comparison of Precipitates and Sulfurization Process |
| title_fullStr | Treatment of Acidic Solutions Containing As(III) and As(V) by Sulfide Precipitation: Comparison of Precipitates and Sulfurization Process |
| title_full_unstemmed | Treatment of Acidic Solutions Containing As(III) and As(V) by Sulfide Precipitation: Comparison of Precipitates and Sulfurization Process |
| title_short | Treatment of Acidic Solutions Containing As(III) and As(V) by Sulfide Precipitation: Comparison of Precipitates and Sulfurization Process |
| title_sort | treatment of acidic solutions containing as iii and as v by sulfide precipitation comparison of precipitates and sulfurization process |
| topic | sulfurization precipitate-As(III) precipitate-As(V) elemental S As<sub>2</sub>S<sub>3</sub> |
| url | https://www.mdpi.com/2075-4701/13/4/794 |
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