教師資料查詢 | 類別: 期刊論文 | 教師: 李奇旺 Chi-Wang Li (瀏覽個人網頁)

標題: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
語言英文
ISSN1879-1298;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
國別英國
公開徵稿
出版型式,電子版,紙本
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