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Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: Removal of Hexacyanoferrate(II) Using Zn-Al-OAc Hydrotalcite as an Anion Exchanger | Journal of Physical Science Vol. 20 2 73-84 2009 73 Removal of Hexacyanoferrate II Using Zn-Al-OAc Hydrotalcite as an Anion Exchanger Roto Roto Fitriana Nindiyasari and Iqmal Tahir Department of Chemistry Faculty of Mathematics and Natural Sciences Gadjah Mada University Sekip Utara Yogyakarta 55281 Indonesia Corresponding author roto05@ugm.ac.id Abstract Cyanide is a highly toxic anion and ingestion exposure can be fatal. Cyanide can be removed from water systems using Zn-Al-OAc hydrotalcite OAc acetate as an ion exchanger. A synthesis of Zn-Al-OAc hydrotalcite has been performed and it was used as an anion exchanger to reduce the concentration of cyanide in the form of Fe CN 6 4. Zn-Al-OAc hydrotalcite was prepared using a stoichiometric method followed by hydrothermal treatment. The chemical composition of Zn-Al-OAc hydrotalcite was found to be Zno73AlO27 OH 2 OAc O27.0.95H2O. The anion exchange reaction of OAc by Fe CN 6 4- was fit to yield a second order reaction rate constant of k 0.215 M-Is-1 with R2 0.996. The anion exchange capacity AEC was found to be 219 meq Fe CN 6 4- 100 g hydrotalcite. It was found that Zn-Al-Fe CN 6 hydrotalcite could not be regenerated by OAc-. Keywords hydrotalcite acetate anion exchange capacity hexacyanoferrate II regeneration Abstrak Sianida merupakan anion yang sangat toksik dan jika tertelan boleh membawa maut. Sianida boleh dikeluarkan dari sistem air menggunakan Zn-Al-OAc hidrotalsit OAc acetate sebagai penukar ion. Sintesis terhadap Zn-Al-OAc hidrotalsit telah dijalankan dan telah digunakan sebagai penukar anion untuk mengurangkan penumpuan sianida dalam bentuk Fe CN 6 4 . Zn-Al-OAc hidrotalsit telah disediakan menggunakan kaedah stoichiometric diikuti dengan rawatan hidrotermal. Komposisi kimia Zn-Al-OAc hidrotalsit telah ditemukan menjadi ZnO73AlO27 OH 2 OAc O27.0.95H2O. Tindakbalas penukaran anion daripada OAc dengan Fe CN 6 4 telah menghasilkan kadar tetap laju reaksi tahap kedua k 0.215 M1s 1 dengan R2 0.996. Kapasiti
