Synthesis of NaX Zeolite from Blitar Kaolin via Hydrothermal and Sonication Methods with Alkali Fusion Pre-treatment

Khalifah, Susi Nurul, Fiddaroini, Saidun, Arifah, Aminatus, Hasanah, Awwali Maf’ulah and Prasetyo, Anton ORCID: https://orcid.org/0000-0003-1575-8634 (2025) Synthesis of NaX Zeolite from Blitar Kaolin via Hydrothermal and Sonication Methods with Alkali Fusion Pre-treatment. Jurnal Kimia Sains dan Aplikasi, 28 (5). pp. 274-282. ISSN 1410-8917

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Abstract

NaX zeolite, widely recognized for its applications in cation exchange, adsorption, and catalysis, was successfully synthesized from Blitar natural kaolin using an alkali fusion pre-treatment, followed by two comparative synthesis methods: hydrothermal and sonication. The synthesis was conducted at 70°C for 2 and 4 hours. Optimal conditions were achieved with a NaOH/kaolin weight ratio of 2.0 and a synthesis gel composition of 10SiO2: 1Al2O3: 6Na2O: 180H2O (molar ratio). X-ray diffraction (XRD) confirmed the transformation of natural kaolin into sodium silicate, with sonication yielding phase-pure NaX zeolite, while the hydrothermal method resulted in NaX with sodalite impurities. Fourier-transform infrared (FTIR) spectroscopy identified characteristic NaX vibrations, and scanning electron microscopy (SEM) revealed cubic-shaped particles in the sonication method. The sonication process accelerated crystallization, producing higher-purity zeolite in shorter times than hydrothermal synthesis. These findings emphasize the effectiveness of sonication in enhancing the crystallinity and purity of NaX zeolite, offering a robust, time-efficient alternative for large-scale zeolite production.

Item Type:	Journal Article
Keywords:	Zeolite NaX; Kaolin, Hydrothermal; Sonication; Alkali Fusion
Subjects:	03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030206 Solid State Chemistry 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry > 030299 Inorganic Chemistry not elsewhere classified 03 CHEMICAL SCIENCES > 0302 Inorganic Chemistry
Divisions:	Faculty of Mathematics and Sciences > Department of Chemistry
Depositing User:	susi nurul khalifah
Date Deposited:	21 Dec 2025 22:11

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