Pengaruh Variasi Rasio Solid-to-Liquid dan Tebal Dinding Geopolimer Berpori dengan Bahan Dasar Metakaolin sebagai Material Enkapsulasi Kalium untuk Slow-Release Fertilizers

Dewi, Siti Fathimah Az-Zahra (2025) Pengaruh Variasi Rasio Solid-to-Liquid dan Tebal Dinding Geopolimer Berpori dengan Bahan Dasar Metakaolin sebagai Material Enkapsulasi Kalium untuk Slow-Release Fertilizers. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Geopolimer berpori berbahan dasar metakaolin telah digunakan sebagai material enkapsulasi pupuk kalium konvensional untuk Slow-Release Fertilizers (SRF). SRF dibuat dengan bentuk silinder dengan tinggi 6 cm, tebal dinding 2 cm hingga 6 cm serta rasio solid-to-liquid (S/L) 0,75; 1; dan 1,25. SRF dibuat menggunakan metode wet mixing dengan penambahan agen pembentuk pori H2O2 sebanyak 3,5% dari total massa pasta geopolimer. Geopolimer dianalisis menggunakan XRD untuk menentukan fase kristal pada tiap variasi. Jumlah ion kalium yang dilepaskan dikarakterisasi dengan AAS setelah SRF mengalami leaching sampai dengan 24 jam. Hasil menunjukkan bahwa jumlah ion kalium yang dilepaskan kurang dari 15% dalam waktu 24 jam, yang menunjukkan bahwa geopolimer berpori berbahan metakaolin efektif digunakan sebagai material enkapsulasi pupuk, selain itu semakin tebal dinding geopolimer semakin lambat laju pelepasannya. Rasio S/L berpengaruh terhadap ukuran pori yang terbentuk. Nilai daya serap air dan open pores berbanding lurus dengan kenaikkan rasio S/L, sedangkan porositas mencapai nilai maksimum pada S/L 1. Mekanisme pelepasan ion kalium pada penelitian kali ini mengikuti orde 0 yang menunjukkan bahwa pelepasan ion kalium tidak dipengaruhi oleh konsentrasi pupuk.
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Porous geopolymer based on metakaolin has been utilized as an encapsulation material for conventional potassium fertilizers in Slow-Release Fertilizers (SRF). The SRF was fabricated in a cylindrical shape with a height of 6 cm, wall thickness ranging from 2 cm to 6 cm, and solid-to-liquid (S/L) ratios of 0.75, 1, and 1.25. The SRF was produced using the wet mixing method with the addition of a pore-forming agent, H2O2, at 3.5% of the total geopolymer paste mass. The geopolymers were analyzed using XRD to determine the crystalline phases for each variation. The amount of potassium ions released was characterized using AAS after the SRF underwent leaching for up to 24 hours. The results indicated that the amount of potassium ions released was less than 15% within 24 hours, demonstrating that porous geopolymers based on metakaolin are effective as fertilizer encapsulation materials. Additionally, thicker geopolymer walls slowed the release rate. The S/L ratio influenced the pore size formed. Water absorption and open pore values were directly proportional to the increase in S/L ratio, while porosity reached its maximum value at an S/L ratio of 1. The potassium ion release mechanism in this study followed zero-order kinetics, indicating that potassium ion release was independent of fertilizer concentration.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Geopolimer Berpori, kalium, metakaolin, pupuk, slow-release fertilizer
Subjects:	Q Science > QD Chemistry > QD181.S6 A4 Aluminum silicates Q Science > QD Chemistry > QD502 Chemical kinetics
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Dewi Siti Fathimah Az-Zahra
Date Deposited:	03 Feb 2025 13:09
Last Modified:	03 Feb 2025 13:09
URI:	http://repository.its.ac.id/id/eprint/117917

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