SINTESIS ZEOLIT DARI BATU APUNG (PUMICE) DAERAH IJOBALIT LOMBOK TIMUR SEBAGAI ADSORBEN LOGAM Fe
DOI:
https://doi.org/10.31764/orbita.v7i2.6010Keywords:
Adsorbent, Pumice Stone, Zeolite.Abstract
ABSTRAK
Aktivitas letusan besar Gunung Api Samalas di Lombok meninggalkan jejak mineral batuan beku salah satunya batu apung (pumice). Batu apung memiliki komposisi mineral utama berupa silika sebanyak 58,3%. Tujuan dari penelitian untuk identifikasi karakteristik zeolit dari batu apung sebagai adsorben logam Fe. Zeolite disintesis menggunakan metode kopresipitasi. Identifikasi gugus fungsi, kristalinitas, dan struktur kristal zeolite sintesis menggunakan FTIR dan XRD. Sedangkan analisis adsorbsi menggunakan AAS. Zeolit berhasil terbentuk dari sintesis batu apung ditandai dengan kemunculan gugus fungsi TO4 dan gugus fungsi Si-O-Si pada panjang gelombang 983,85 cm-1 dan 660,02 cm-1. Zeolit yang terbentuk dari proses sintesis batu apung yaitu tipe zeolit ZK-14 dengan struktuk kristal kubik. Adapun hasil analisis kemampuan adsorbs dari zeolite ZK-14 ini sangat baik mencapai 99,22% pada komposisi Si/Al pada 25/30. Sehingga sintesis batub apung menjadi zeolite dapat diaplikasikan sebagai penyerap logam Fe.
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Kata kunci: Adsorben; Batu Apung; Zeolit.
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ABSTRACT
The massive eruption activity of the Samalas Volcano in Lombok left traces of igneous rock minerals, one of which was pumice. The pumice has a main mineral composition of 58.3% silica. The purpose of this study is to identify the characteristics of zeolite from pumice as an adsorbent of Fe metal. Zeolite has been synthesized using a coprecipitation method. The identification of functional groups, crystallinity, and crystal structure of synthetic zeolite using FTIR and XRD. Meanwhile, AAS was implemented for the adsorption analysis. The zeolite was successfully formed from the synthesis of pumice characterized by the appearance of the TO4 functional group and the Si-O-Si functional group at wavelengths of 983.85 cm-1 and 660.02 cm-1. The zeolite fabricated from the pumice synthesis process is ZK-14 type zeolite with a cubic crystal structure. The examination results from the adsorption ability of zeolite ZK-14 are very good, reaching 99.22% at the Si/Al composition at 25/30. In fact, the synthesis of pumice into zeolite can be applied as an absorber of Fe metal.
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Keywords: Adsorbent; Pumice Stone; Zeolite.
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