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Preparation of layered double hydroxides (LDHS) for arsenate and chromate removal

Ho Nguyen Nhat Ha, Tran Boi An, Van Viet, Nguyen Thi Mai Tho, Tran Ngoc Thang, Cao Van Du, Nguyen Binh Kha, Bui Quang Minh, Nguyen Thi Phuong Dieu, Nguyen Thi Kim Phuong


Layer double hydroxides (LDHs) including MgFe-Cl (2:1), MgAl-Cl (2:1), ZnFe-Cl (2:1) and ZnAl-Cl (2:1) were synthesized by co-precipitation followed by calcination in air at 400 oC. The as-synthesized LDHs were characterized by powder X-Ray Diffraction, Scanning Electron Microscopy, Fourrier Transform Infrared spectroscopy and Brunauer Emmett Teller nitrogen adsorption method and tested for adsorption of arsenate (AsO43-) and chromate (CrO42-). The powder X-Ray Diffraction and Scanning Electron Microscopy revealed that the synthesized LDHs possess high crystallinity and hierarchical structure. At initial concentration ([AsO43-] or [CrO42-] = 100 mg/L), more than 99 % of AsO43- and CrO42- were removed by MgFe-Cl and MgAl-Cl. Approximately 71.62 % of AsO43-and 86.54 % of CrO42- were removed by ZnAl-Cl. While the removal of AsO43- and CrO42- by ZnFe-Cl were 78.33 % and 90.7 %,  respectively. Thus, present work has demonstrated that MgFe-Cl and MgAl-Cl is an interesting potential adsorbent application for AsO43- and CrO42- decontamination technology.

Keywords. Layered double hydroxides, arsenate, chromate, removal.


Layered double hydroxides, arsenate, chromate, removal

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