Study of The Acid-Base Effect on Zeolite Activation and Its Characterization as Adsorbent of Methylene Blue Dye

Abstract

ABSTRAKAktivasi merupakan salah satu proses yang banyak dilakukan untuk meningkatkan kualitas zeolit alam. Proses aktivasi pada zeolit akan merubah rasio Si/Al dan dapat meningkatkan terbentuknya rongga kosong sehingga kemampuan zeolit sebagai adsorben menjadi optimal. Pada penelitian ini, zeolit alam yang digunakan berasal dari kabupaten Ende, Nusa Tenggara Timur. Aktivasi zeolit alam Ende dilakukan secara kimia dengan menggunakan larutan HCl dan NaOH pada variasi konsentrasi yaitu 0,5 M; 1,5 M; dan 3,0 M. Selanjutnya zeolit yang telah diaktivasi digunakan untuk mengadsorpsi zat pewarna biru metilena. Berdasarkan hasil penelitian, aktivasi zeolit alam secara kimia dapat meningkatkan kapasitas adsorpsi terhadap zat warna biru metilena. Nilai kapasitas adsorpsi zeolit alam Ende sebelum dan sesudah aktivasi berturut-turut adalah 17,289 mg/g dan 19,988 mg/g. Model Langmuir lebih sesuai untuk proses kesetimbangan adsorpsi isotermal. Kata kunci: zeolit, aktivasi, kapasitas adsorpsi, KTK ABSTRACTActivation is one of the processes by which are mostly done to improve the quality of natural zeolite. Activation process by zeolite will change the ratio of the Si/Al and can increase the formation of empty cavities so that the capability of zeolite as an adsorbent be optimal. In this research, natural zeolite from the district of Ende, Nusa Tenggara Timur. Activation Ende natural zeolite done chemically using HCl and NaOH solution, with variations concentrate 0,5 M; 1,5 M; and 3,0 M. Next, zeolite which has activated used to adsorb dye methylene blue. Based on the research results, chemically of activation from natural zeolite can increase the adsorption capacity to substance methylene blue. The adsorption capacity in the Ende natural and after activation is 17,289 mg/g and 19,98 mg/g respectively. The Langmuir model most closely matched the isothermal adsorption of equilibrium process.

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“…Figure 4 also shows that the NaOH-activated sorbent had the highest absorption efficiency. This is because the acid activator (HCl) promotes formation of more positive charge, whereas, the base activator (NaOH) causes the adsorbent to be more negative-charged which is more beneficial in the adsorption process [46]. The Na ion from NaOH has good affinity to functional groups that carry negative ions, thus, during the adsorption process the ion exchange between Na ions and metal ions can be promoted [47].…”

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“…Sebelum digunakan sebagai katalis, zeolit alam diaktivasi terlebih dahulu [80]. Aktivasi perlu dilakukan karena zeolit alam pada umumnya mempunyai stabilitas termal yang tidak terlalu tinggi dengan ukuran pori yang tidak seragam, mengandung banyak pengotor dan aktivitas katalitik yang rendah [17].…”

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“…Adsorption is the process of absorption of a molecule (adsorbate) on the surface of another substance (adsorbent) due to the attractive force between the two substances [10]. The adsorbent innovation being developed is a natural mineral resource with high absorption capacity, is easily available at low cost, and has abundant availability.…”