Effective removal of zinc from aqueous solution by hydrocalumite

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• 作者：Qiang Liu ; Yajun Li ; Jia Zhang ; Ying Chi ; Xiuxiu Ruan ; Jianyong Liu ; Guangren Qian  ; ;   ; ^{grqian@shu.edu.cn}
• 关键词：Hydrocalumite ; Zinc removal ; ZnAl-LDHs ; Visual MINTEQ
• 刊名：Chemical Engineering Journal
• 出版年：2011
• 出版时间：15 November 2011
• 年：2011
• 卷：175
• 期：Complete
• 页码：33-38
• 全文大小：474 K

文摘

Zinc (Zn²⁺) from aqueous solutions was removed via synthesized hydrocalumite, and Visual MINTEQ was applied to verify the removal process in this paper. The results showed that the maximum removal capacity of Zn²⁺ was 7.34, 6.72 and 7.57 mmol L^? with SO₄^{2?/sup>, NO₃?/sup> and Cl?/sup>, respectively. Under an initial Zn2+ concentration of 10.2 mmol L? in ZnSO₄ solution, the final Ca2+ concentration was equal to 5.4 mmol L?, and the corresponding primary precipitation was ZnAl-SO₄-LDHs. However, in ZnCl₂ or Zn(NO₃)₂ solutions, released Al(OH)₄?/sup> was mainly recrystallized with Zn2+ to form ZnAl-Cl-LDHs. The simulated results were consistent with the experimental ones, which revealed that Zn2+ removal was via dissolution and selective precipitation. Therefore, this research proved that hydrocalumite was an efficient Zn2+ sorbent and Visual MINTEQ could offer a novel way to validate the removal process.}