Study on arsenic removal in aqueous chloride solution with lead oxide
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A new method to remove arsenic from aqueous chloride solution by using lead oxide was proposed, and the effects of the lead(II)/arsenic(V) molar ratio (nPb(II):nAs(V)), initial pH of solution, initial concentrations of chloride ion (Cl−) and arsenic(V) on arsenic removal were investigated. The results showed that nPb(II):nAs(V), initial pH and initial Cl− concentration had great influence on arsenic removal. The suitable conditions of arsenic removal were initial pH of 1.8–2.4 and initial Cl− concentration of 0.52–2.00 g L−1 for 200 mg L−1 As(V) solution. Initial As(V) concentration had little influence on arsenic removal when the appropriate nAs(V):n Cl − was controlled in the solution at nPb(II):nAs(V) of 1.52. Based on these conditions, As(V) removal efficiency reached up to 99.99% and As(V) concentration decreased from 200 mg L−1 to less than 0.01 mg L−1 at initial pH of 1.8 with nPb(II):nAs(V) of 2.12. Various characterizations confirm that the formed precipitate was mimetite (Pb5(AsO4)3Cl) and had better thermal stability within 500 °C. For the prevalent problem of lead dissolution by forming mimetite, Pb residual concentration reduced from 337.6 to 0.07 mg L−1 using sodium sulfide in the solution after arsenic removal. Therefore, lead oxide could be used as an effective reagent of arsenic removal to remove As(V) from aqueous chloride solution.
KeywordsArsenic removal Lead oxide Lead recovery Mimetite
This research was supported by Hunan Provincial Natural Science Foundation of China (Grant No. 2016JJ6017) and Hunan Province Key Research and Development Project of China (Grant No. 2017SK2254).
Conflict of interest
The authors declare that they have no conflict of interest.
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