Recycling Mg(OH)2 Nanoadsorbent during Treating the Low Concentration of CrVI

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• 作者：Weizhen Liu ; Feng Huang ; YongJing Wang ; Ting Zou ; Jinsheng Zheng ; Zhang Lin
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：March 1, 2011
• 年：2011
• 卷：45
• 期：5
• 页码：1955-1961
• 全文大小：930K
• 年卷期：v.45,no.5(March 1, 2011)
• ISSN：1520-5851

文摘

Investigations about how to recycle the deactivated nanomaterials are well-needed. This work was designed to explore the recycling strategy of Mg(OH)₂ nanoadsorbent during treating low concentration of Cr^VI solution as an example. It was demonstrated that a reversible route between Cr-adsorbed nano-Mg(OH)₂ and Cr-desorbed bulk-MgCO₃路3H₂O can be established by using CO₂ as a phase transformation medium. In each adsorption鈭抎esorption cycle, Cr^VI solution with initial concentration of 10 mg路L^鈭? could be enriched over 40 times. An aggregation-induced rapid phase transformation mechanism from nano-Mg(OH)₂ to bulk-MgCO₃路3H₂O was discovered, which was one of the critical factors to ensure the disposing efficiency of this environmental-friendly Cr^VI disposal system. A pilot-scale experiment was conducted with this strategy to deal with 50 L Cr^VI-containing simulated industrial wastewater. The enrichment of Cr^VI and the recycle of nano-Mg(OH)₂ can be successfully achieved simultaneously.