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《Spectroscopy and Spectral Analysis》 2006-05
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Adsorption and Coprecipitation of Dissolved Metals with Jarosite under Conditions Simulating Sewage Sludge Bioleaching

ZHOU Shun-gui, ZHOU Li-xiang~* College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China  
The inoculation of Acidithiobacillus ferrooxidans and the addition of Fe~ 2+ as their substrates accelerated the solubilization of Zn, Cu and Cr from sewage sludge. However, a decrease in Cu removal from 91% to 60% with time elapse could be observed in the late process, which appeared simultaneously with the formation of jarosite resulting from hydrolysis of Fe~ 3+ . The tested jarosite was synthesized by using bacterial oxidation of Fe~ 2+ by resting A. ferrooxidans in acid solution (pH 2.5) under conditions stimulating sludge bioleaching. Adsorption edge measurement showed that only less than 9% of Cu~ 2+ was adsorbed onto jarosite in the pH range of 2.0-2.5, indicating that adsorption mechanism could not explain fully re-sorption of Cu~ 2+ (about 31%) in the anaphase of bioleaching process. In the coprecipitation studies, when jarosite was precipitated in the presence of Cu~ 2+ (10 mg·L~ -1 ), a significant amount of Cu (44.6%) was incorporated into the precipitate. Coprecipitation of jarosite with Cu~ 2+ was the predominant process by which soluble Cu was partially re-sorpted by jarosite in the anaphase of bioleaching process.
【Fund】: 国家自然科学基金(20177016);; 国际科学基金(IFS C/2669-2);; 江苏省自然科学基金重点项目(BK2004213)资助
【CateGory Index】: X703
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