CN and heavy metal removal through formation of layered double hydroxides from mixed CN-containing electroplating wastewaters and pickle acid liquor

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• 作者：Yunfeng Xu^a ; Jia Zhang^a ; Jizhi Zhou^a ; Chun Chen^a ; Qiang Liu^a ; Guangren Qian^a ; ^{grqian@shu.edu.cn} ; Zhi Ping Xu^b ; ^{gordonxu@uq.edu.au}
• 关键词：CN-containing heavy metal wastewaters ; Pickle acid liquor ; Layered double hydroxide (LDH)
• 刊名：Chemical Engineering Journal
• 出版年：2013
• 出版时间：15 January, 2013
• 年：2013
• 卷：215-216
• 期：Complete
• 页码：411-417
• 全文大小：1261 K

文摘

The common ligand CN^? has been widely used in some core industries, such as electroplating and mining, as it significantly enhances process efficiency and product quality. The use of CN^? however generates a vast amount of CN-containing heavy-metal wastewaters, harming both environmental and human health. In this research paper, we present a co-precipitation strategy to treat CN-containing heavy-metal wastewaters (Ni, Zn, Cr and Fe) and pickle acid liquor (Fe) via formation of layered double hydroxide (LDH). Our experimental data demonstrate that Zn, Cr and Fe were completely removed and Ni was reduced from 100-400 to 3.0 mg/L, and about 60 % CN^? was simultaneously removed (from 6-8 to 2.5-4 mg/L). This efficiency was constantly achieved under varied experimental conditions, including a wide range of heavy metal concentrations and their ratio with pH in 7-11 at 25-60 ¡ãC.