Recovery of Cu(II) by chemical reduction using sodium dithionite
學年 104
學期 1
出版(發表)日期 2015-12-01
作品名稱 Recovery of Cu(II) by chemical reduction using sodium dithionite
作品名稱(其他語言)
著者 Yi-Hsuan Chou; Jui-Hsuan Yu; Yang-Min Liang; Pin-Jan Wang; Chi-Wang Li; Shiao-Shing Chen
單位
出版者
著錄名稱、卷期、頁數 Chemosphere 141, pp.183-188
摘要 Wastewaters containing Cu(II) along with ligands are ubiquitous in various industrial sectors. Efficacy of treatment processes for copper removal, especially precipitation, is greatly debilitated by ligands. Chemical reduction being commonly employed for production of metal nanoparticles has also been used for removing copper. Addition of ammonia was reported to be essential for improving copper reduction efficiency by increasing copper solubility at alkaline pH values. In this study, chemical reduction was employed to treat ligand-containing wastewater, exploiting the fact that ligands and metals are coexisted in many wastewaters. Result shows that copper ions were removed by either reduction or precipitation mechanisms depending on pH, type of ligands, and mixing condition. Complete copper reduction/removal was achieved under optimal condition. The lowest removal efficiency observed at pH 9.0 for ammonia system is due to formation of nano-sized particles, which are readily to pass through 0.45μm filter used for sample pretreatment before copper analysis. Instead of producing metallic copper, cuprous and copper oxide are identified in the samples collected from ammonia system and EDTA system, respectively. Re-oxidation of metallic copper particles by atmospheric oxygen during sample handling or incomplete reduction of Cu(II) ions during reduction process might be the cause. Finally, reduction process was applied to treat real wastewater, achieving complete removal of copper but only 10% of nickel.
關鍵字 Dithionite;Ligands;Metallic copper;Reduction
語言 en
ISSN 1879-1298 0045-6535
期刊性質 國外
收錄於 SCI
產學合作
通訊作者 Chi-Wang Li
審稿制度
國別 GBR
公開徵稿
出版型式 ,電子版,紙本
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