Faktor-Faktor Penentu Dalam Pelepasan Kalium Pada Slow Release Fertilizer Berbasis Geopolimer Berpori

Hamzah, Achmad Nur (2025) Faktor-Faktor Penentu Dalam Pelepasan Kalium Pada Slow Release Fertilizer Berbasis Geopolimer Berpori. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini bertujuan menganalisis formulasi dan signifikansi faktor dari pupuk kalium terenkapsulasi dalam geopolimer berpori (KTGP) sebagai sistem pelepasan hara lambat (slow release fertilizer). Proses sintesis KTGP menggunakan bahan dasar metakaolin dengan variasi ketebalan enkapsulasi (X₁), penambahan H₂O₂ sebesar 7% sebagai agen pembusa (X₂), dan massa pupuk kalium (X₃), yang dirancang melalui Box-Behnken Design (BBD) dengan metode Response Surface Methodology (RSM). Proses leaching dilakukan selama 24 jam untuk menganalisis pelepasan ion kalium (K⁺). Hasil pemodelan menunjukkan bahwa persamaan kuadratik paling banyak menghasilkan signifikansi pada variabel independen terjadi pada waktu ke-24 jam dengan persamaan aktual: y = 3419,8018 − 1616,0925x₁ − 1477,1134x₂ + 1542,2278x₃ − 35,8447x₁x₂ + 10,5180x₁x₃ − 76,9484x₂x₃ + 170,6775x₁² + 272,7640x₂² − 157,7484x₃². Ketebalan enkapsulasi (X₁) terbukti sebagai variabel yang paling konsisten dan signifikan terhadap pelepasan K⁺ dari jam ke-3 hingga ke-24, terutama pada fase lag. Pada waktu leaching 24 jam, sistem memasuki fase pelepasan konstan, dan signifikansi model menghasilkan pengaruh massa pupuk (X₃), efek kuadratik dari H₂O₂ (X₂²), serta interaksi antara X₁ dan X₂. Penambahan H₂O₂ sebesar 7% juga berperan dalam meningkatkan karakteristik pori seperti open pores, diameter aktual open pores, daya serap air, dan porositas. Namun, pada 4 g H₂O₂ dari total komposisi geopolimer, terjadi penurunan porositas akibat terbentuknya void berukuran besar. Penelitian ini menunjukkan bahwa KTGP dapat menghasilkan sistem SRF yang mampu mengontrol pelepasan nutrien secara perlahan dan efisien.
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This study aims to analyse the formulation and significance of factors in encapsulated potassium fertilizer in porous geopolymers (KTGP) as a slow release fertilizer system. The synthesis process of KTGP uses metakaolin as the base material with variations in encapsulation thickness (X₁), the addition of 7% H₂O₂ as a foaming agent (X₂), and potassium fertilizer mass (X₃), designed using the Box-Behnken Design (BBD) with the Response Surface Methodology (RSM). The leaching process was conducted for 24 hours to analyse potassium ion (K⁺) release. The modelling results showed that the quadratic equation produced the most significance in the independent variables at 24 hours with the actual equation: y = 3419.8018 − 1616.0925x₁ − 1477.1134x₂ + 1542.2278x₃ − 35.8447x₁x₂ + 10.5180x₁x₃ − 76.9484x₂x₃ + 170.6775 x₁² + 272.7640x₂² − 157.7484x₃². Encapsulation thickness (X₁) was found to be the most consistent and significant variable affecting K⁺ release from hour 3 to hour 24, particularly during the lag phase. At 24 hours of leaching, the system entered the constant release phase, and the significance of the model revealed the influence of fertilizer mass (X₃), the quadratic effect of H₂O₂ (X₂²), and the interaction between X₁ and X₂. The addition of 7% H₂O₂ also plays a role in improving pore characteristics such as open pores, actual diameter of open pores, water absorption capacity, and porosity. However, at 4 g of H₂O₂ from the total geopolymer composition, porosity decreases due to the formation of large voids. This study shows that KTGP can produce an SRF system capable of controlling nutrient release slowly and efficiently.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Geopolimer Berpori, Box Behnken Design, Response Surface Methodology, Pelepasan Ion K+, Slow Release Fertilizer. Porous Geopolymer, Behnken Box Design, Response Surface Methodology, K+ Ion Release, Slow Release Fertilizer.
Subjects:	Q Science > QD Chemistry > Polymerization
Divisions:	Faculty of Mathematics and Science > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Achmad Nur Hamzah
Date Deposited:	04 Aug 2025 12:49
Last Modified:	04 Aug 2025 12:49
URI:	http://repository.its.ac.id/id/eprint/126238

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