Studi Adsorpsi-Desorpsi Anion Fosfat pada Zeolit Termodifi-kasi CTAB

Maya Sari Ananda Pohan, Sutarno Sutarno, Suyanta Suyanta

Abstract


Telah dipelajari modifikasi zeolit alam Klaten dengan CTAB (setiltrimetilamonium bromida) yang bertujuan untuk membuat adsorben limbah anion fosfat. Dalam hal pemanfaatannya kembali dilakukan studi desorpsi dalam medium air dan asam sitrat 0,33 M untuk mengetahui potensi zeolit termodifikasi CTAB sebagai pupuk lepas lambat. Penelitian ini diawali dengan preparasi, aktivasi dan karakterisasi zeolit alam dengan XRD, FTIR, SEM-EDS dan penentuan kapasitas tukar kationnya. Selanjutnya dilakukan modifikasi zeolit dengan CTAB sebanyak dua kali kapasitas tukar kationnya dan digunakan untuk adsorpsi anion fosfat. Pada adsorpsi fosfat, dipelajari pengaruh pH, waktu kontak, kinetika serta pola isoterm adsorpsinya. Setelah diadsorpsi, fosfat tersebut didesorpsi dalam medium air dan asam sitrat 0,33 M dengan variasi waktu. Pengukuran konsentrasi yang tidak teradsorpsi dan yang terdesorpsi dilakukan secara spektrometri UV-Vis. Hasil penelitian menunjukkan bahwa modifikasi zeolit alam menggunakan CTAB menyebabkan permukaan zeolit tertutup oleh CTAB sehingga dapat menyerap anion fosfat. Zeolit termodifikasi CTAB dapat mengadsorpsi anion fosfat secara maksimal pada pH=5 dan waktu kontak=60 menit. Adsorpsi fosfat mengikuti model kinetika Ho dengan laju adsorpsi sebesar 0,112 g mmol-1 menit-1 dan mengikuti pola isoterm adsorpsi Langmuir dengan kapasitas adsorpsi sebesar 8,873 x 10-5 mol g-1 dan K sebesar 28,972 x 105 g mol-1. Jumlah anion fosfat yang terdesorpsi lebih banyak dalam medium asam sitrat 0,33 M daripada dalam medium air. Berdasarkan hasil penelitian yang diperoleh, zeolit termodifikasi CTAB yang telah mengadsorpsi limbah anion fosfat berpotensi dimanfaatkan sebagai pupuk lepas lambat.

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DOI: https://doi.org/10.56064/jps.v18i3.20

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