Dita Ayu Rosmawati, - (2023) SINTESIS DAN KARAKTERISASI HIDROGEL PVA/GA/POM/CNT, DAN UJI KINERJANYA SEBAGAI MATERIAL S-CRF CaCl2 DAN S-CRF ZnCl2. S1 thesis, Universitas Pendidikan Indonesia.
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Abstract
Penggunaan pupuk berlebih dalam praktek pertanian berpotensi menimbulkan leaching nutrien berlebih dan dapat mencemari lingkungan. Penggunaan material Controlled Release Fertilizer (CRF) berbasis hidrogel menjadi salah satu solusi untuk mengatasi isu tersebut. Mekanisme pelepasan pupuk dari CRF melibatkan penetrasi air ke dalam polimer pembentuk gel dan inti pupuk sehingga nutrien mampu lepas (release) ke tanah secara bertahap pada waktu tertentu. Penelitian ini bertujuan untuk mengkaji pergerakan ion Ca2+ dan Zn2+ (sebagai mikronutrien tanaman) dari dalam hidrogel PVA/GA/POM (PGP) dan PVA/GA/POM/CNT (PGPC) ke medium akuades. Hidrogel PGPC disintesis menggunakan prekursor Polivinil Alkohol (PVA) 3%, crosslinker glutaraldehida (GA) 1,25%, ekstrak Premna oblongifolia Merr. (POM) 1%, dan dispersi functionalized MWCNT dengan perbandingan volume 15:7,5:15:7 mL. Karakteristik hidrogel ditentukan berdasarkan hasil pengukuran FTIR, SEM, porositas dan sudut kontak. Pengukuran kinerja hidrogel sebagai CRF dilakukan dengan mengukur swelling ratio, water retention, serta kemampuan absorpsi dan desorpsi nutrien secara konduktometrik. Hasil karakterisasi menunjukkan bahwa dengan penambahan MWCNT ke dalam campuran prekursor PVA, GA, dan POM tidak terjadi interaksi secara kimia; namun mengubah morfologi hidrogel menjadi lebih kasar dan berpori; meningkatkan sifat hidrofilisitas (penurunan sudut kontak air dari 48,27o menjadi 43,68o); dan porositas (dari 66.85% menjadi 76,71%). Penambahan MWCNT juga mampu meningkatkan nilai swelling ratio (dari 673,9% menjadi 966,4%) dan water retention (dari 0,18% menjadi 3,53%); tetapi dapat mengurangi kemampuan absorpsi terhadap nutrien CaCl2 dan ZnCl2. Hasil uji release nutrien mengindikasikan bahwa nutrien lebih cepat keluar dari hidrogel PGPC dibandingkan PGP, sedangkan pada konsentrasi yang sama ditemukan bahwa CaCl2 lebih mudah terdesorpsi dari kedua hidrogel dibandingkan dengan nutrien ZnCl2. Fertilizer overuse in agriculture practice can cause excessive leaching of nutrient and lead to environmental damage. A hydrogel-based Controlled Release Fertilizer (CRF) is used to solve these issues. The mechanism of release fertilizer from CRF involves the penetration of water into the gel-forming polymer and fertilizer core, so the nutrients are able to release gradually at certain time. The purpose of this study is to describe the movement of Ca2+ and Zn2+ ions (as plant’s micronutrients) from PVA/GA/POM (PGP) and PVA/GA/POM/CNT (PGPC) hydrogels into aquadest medium. The PGPC hydrogel was synthesized using 3% Polyvinyl Alcohol (PVA), 1,25% glutaraldehyde (GA) as a crosslinker, 1% Premna oblongifolia Merr. (POM) extract, and functionalized MWCNT dispersion with the volume ratio 15:7,5:15:7 mL. Hydrogel’s characteristics were determined based on the measurement from FTIR, SEM, measurement of porosity, and water contact angle. Hydrogel’s performance as a CRF was carried out by measuring the swelling ratio, water retention, as well as the absorption and desorption ability of nutrients by using conductometric method. The characterization results showed that addition of MWCNT to the mixture of PVA, GA, and POM precursor did not cause any chemical interaction; the morphology of hydrogel became more porous and rough; increase the hydrophilicity (with decrease of water contact angle from 48,27o to 43,68o); and porosity (66,85% to 76,71%). And also, the addition of MWCNT was able to increase the hydrogel’s performance in swelling ratio (from 673.9% to 966.4%); water retention (from 0.18% to 3.53%); but can decrease the absorption ability of CaCl2 and ZnCl2 nutrient. Nutrient release performance test indicated that nutrients will release more quickly from the PGPC hydrogel than from the PGP hydrogel. Meanwhile, at the same concentration, it was found that CaCl2 nutrient was more released easier than ZnCl2 nutrient from both the hydrogel.
| Item Type: | Thesis (S1) |
|---|---|
| Additional Information: | Link Google Scholar : https://scholar.google.com/citations?hl=id&authuser=1&user=XBRRj0YAAAAJ ID SINTA Dosen Pembimbing 5994163 |
| Uncontrolled Keywords: | CaCl2, Controlled Release Fertilizer, glutaraldehida, hidrogel, konduktometri, MWCNT, polivinil alkohol, POM, dan ZnCl2 |
| Subjects: | L Education > L Education (General) |
| Divisions: | Fakultas Pendidikan Matematika dan Ilmu Pengetahuan Alam > Jurusan Pendidikan Kimia > Program Studi Kimia (non kependidikan) |
| Depositing User: | Dita Ayu Rosmawati |
| Date Deposited: | 18 Sep 2023 07:11 |
| Last Modified: | 18 Sep 2023 07:11 |
| URI: | http://repository.upi.edu/id/eprint/106093 |
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