Fuji Nur Resa, - (2024) SINTESIS, KARAKTERISASI, DAN UJI PERFORMA PVA/BORAT/ALGINAT/CHARCOAL SEBAGAI MATERIAL SLOW/CONTROLLED-RELEASE FERTILIZER KCl. S1 thesis, Universitas Pendidikan Indonesia.
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Abstract
Eutrofikasi adalah proses peningkatan produktivitas badan air yang ditandai dengan pertumbuhan alga yang berlebihan akibat peningkatan nutrisi. Salah satu penyebab peningkatan nutrisi ini adalah penggunaan pupuk berlebih di lahan pertanian yang kemudian terbawa air hujan dan masuk ke perairan. Slow/Controlled-Release Fertilizer (S/CRF) dapat menjadi alternatif dalam mengatasi masalah ini. Kajian terhadap PVA/Borat/Alginat sebagai bahan S/CRF menunjukkan bahwa gel tersebut memiliki potensi untuk dikembangkan lebih lanjut. Disisi lain, penambahan filler seperti Charcoal ke dalam hidrogel dapat memperkuat struktur jaringan hidrogel. Penelitian ini bertujuan untuk menentukan konsentrasi Charcoal optimum, mengetahui karakteristik hidrogel PVA/Borat/Alginat/Charcoal, serta performa lembaran hidrogel dan granula. Penelitian dilakukan dalam beberapa tahap, yaitu (1) optimasi konsentrasi Charcoal dari sintesis lembaran hidrogel PVA/Borat/Alginat/Charcoal serta lembaran hidrogel PVA/Borat/Alginat/Charcoal-KCl dan granula CaCO3-KCl terlapisi gel; (2) karakterisasi menggunakan FTIR, SEM, dan water contact angle dari lembaran hidrogel PVA/Borat/Alginat/Charcoal; dan (3) uji performa agrokimia dari lembaran dan granula. Merujuk kepada nilai parameter swelling ratio, water contact angle yang unggul dibandingkan konsentrasi Charcoal yang lebih tinggi, maka hidrogel dengan penambahan Charcoal 5 ppm yang diproses lebih lanjut walaupun memiliki water retention paling rendah. FTIR menunjukkan adanya ikatan O-H, C-H sp3, C=O, B-O, C-O, dan C-C pada kedua hidrogel, dan tidak ditemukan kemunculan atau kehilangan gugus fungsi baru. SEM memperlihatkan bahwa pada pemotretan secara cross sectional terjadi pengurangan densitas alur (lapisan) pada gel yang diimpregnasi dengan Charcoal. Water contact angle menunjukkan penambahan Charcoal menurunkan hidrofilisitas. Swelling Ratio menunjukkan penambahan Charcoal membuat nilai %SR menjadi lebih stabil. Water Retention menunjukkan penambahan Charcoal menurunkan nilai %WR. Uji biodegradabilitas menunjukkan bahwa penambahan Charcoal tidak mengurangi degradabilitas secara signifikan. Uji release behavior menunjukkan bahwa penambahan Charcoal dalam bentuk lembaran efektif memperlambat laju release KCl, dibandingkan hidrogel PVA/Borat/Alginat. Pelapisan granula CaCO3-KCl oleh gel PVA/Borat/Alginat/Charcoal mampu menurunkan laju release KCl, dibandingkan granula CaCO3-KCl tanpa pelapisan. Eutrophication is the process of increasing the productivity of water bodies characterized by excessive algae growth due to increased nutrients. One of the causes of this increase in nutrients is the excessive use of fertilizers on agricultural land which is then carried by rainwater and enters the waters. Slow/Controlled-Release Fertilizer (S/CRF) can be an alternative in overcoming this problem. Studies on PVA/Borate/Alginate as an S/CRF material show that the gel has the potential to be developed further. On the other hand, the addition of fillers such as Charcoal into the hydrogel can strengthen the structure of the hydrogel network. This study aims to determine the optimum Charcoal concentration, the characteristics of PVA/Borate/Alginate/Charcoal hydrogels, and the performance of hydrogel sheets and granules. The research was conducted in several stages, namely (1) optimization of Charcoal concentration from the synthesis of PVA/Borate/Alginate/Charcoal hydrogel sheets and PVA/Borate/Alginate/Charcoal-KCl hydrogel sheets and gel-coated CaCO3-KCl granules; (2) characterization using FTIR, SEM, and water contact angle of PVA/Borate/Alginate/Charcoal hydrogel sheets; and (3) agrochemical performance tests of sheets and granules. Referring to the superior values of swelling ratio, water contact angle parameters compared to the higher Charcoal concentration, the hydrogel with 5 ppm Charcoal addition was further processed despite having the lowest water retention. FTIR showed the presence of O-H, C-H sp3, C=O, B-O, C-O, and C-C bonds in both hydrogels, and no appearance or loss of new functional groups. SEM showed that in cross sectional shots there was a reduction in the density of the grooves (layers) in the Charcoal-impregnated gel. Water contact angle showed that the addition of Charcoal decreased the hydrophilicity. Swelling Ratio shows the addition of Charcoal makes the %SR value more stable. Water Retention shows the addition of Charcoal decreases the %WR value. Biodegradability test shows that the addition of Charcoal does not significantly reduce degradability. Release behavior test shows that the addition of Charcoal in the form of sheets effectively slows down the release rate of KCl, compared to PVA/Borate/Alginate hydrogel. Coating of CaCO3-KCl granules by PVA/Borate/Alginate/Charcoal gel was able to reduce the release rate of KCl, compared to CaCO3-KCl granules without coating.
| Item Type: | Thesis (S1) |
|---|---|
| Additional Information: | https://scholar.google.com/citations?user=D7tBpkAAAAAJ&hl=en SINTA ID Hendrawan : 5994163 SINTA ID Hafiz Aji Aziz: 6748855 |
| Uncontrolled Keywords: | S/CRF, hidrogel, PVA/Borat/Alginat/Charcoal, Charcoal; hydrogel, PVA/Borate/Alginate/Charcoal |
| Subjects: | L Education > L Education (General) |
| Divisions: | Fakultas Pendidikan Matematika dan Ilmu Pengetahuan Alam > Jurusan Pendidikan Kimia > Program Studi Kimia (non kependidikan) |
| Depositing User: | Fuji Nur Resa |
| Date Deposited: | 13 Sep 2024 07:37 |
| Last Modified: | 13 Sep 2024 07:37 |
| URI: | http://repository.upi.edu/id/eprint/124579 |
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