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Dina Kartika Maharani
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Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia. 60231
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Unesa Journal of Chemistry
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Published by Universitas Negeri Surabaya
ISSN : -     EISSN : 22528180     DOI : https://doi.org/10.26740/ujc.v11n2
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
UNESA Journal of Chemistry is online Journal covering all aspects of Chemistry. The journal publishes original research paper and review articles.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 93 Documents
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Sintesis dan Karakterisasi Urea Slow Release Fertilizer (SRF) dengan Matriks Kitosan Termodifikasi PVA/CaCO3 Yasfin Shafa Nurulisia; Sari Edi Cahyaningrum
Unesa Journal of Chemistry Vol. 14 No. 1 (2025): Vol 14 No 1 (2025): On Progress
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v14n1.p8-14

Abstract

Urea fertilizer is widely used in the agricultural due to its high content of nitrogen (±46%). However, only 30-40% of nitrogen that is effectively absorbed by plants, while the remainder is lost to the environment. Therefore, the development of SRF offers a potential solution to improve the efficiency utilization of urea fertilizer. In this study, urea based SRF was successfully synthesized using the casting method which is the urea with concentration of 0, 1000, 2000 and 3000 ppm was coated with chitosan which modified by PVA/CaCO3. In addition to synthesis, the urea SRF was also characterized through swelling and porosity test showed that the higher the concentration of urea that added, the lower of swelling degree and %porosity of the urea SRF. Meanwhile, the result of the urea release test indicated that when the urea concentration increased led to a higher urea release rate, resulting in a greater percentage of urea release.
PENGARUH PVA PADA PEMBUATAN PUPUK UREA SLOW RELEASE FERTILIZER PADA MATRIKS KITOSAN TERMODIFIKASI Marena, Betari; Cahyaningrum, Sari Edi
Unesa Journal of Chemistry Vol. 13 No. 3 (2024): Vol 13 No 3 (2024)
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v13n3.p83-88

Abstract

Slow Release Fertilizer can be made with organic or inorganic materials. Several materials have been compared in their properties to produce SRF membranes that have the most suitable properties to be made as SRF. In this study, SRF was made with chitosan-PVA-Urea-Ca materials with the aim of increasing the efficiency of urea fertilizer absorption by plants. The method used in making this SRF is the casting method, the membrane solution will be spread on a surface and the solvent will be evaporated so that a dry SRF membrane can be produced. The results of the study showed that the more PVA added, the degree of swelling can be increased, its elasticity can be increased, and its porosity can be reduced so that it can increase the efficiency of urea absorption by plants
Identification Identification of Functional Groups in Sludge 120C of Ammonia IB Factory PT Petrokimia Gresik by ATR-FTIR Method Cholillah, Vidya Nur
Unesa Journal of Chemistry Vol. 14 No. 1 (2025): Vol 14 No 1 (2025): On Progress
Publisher : Department of Chemistry, Faculty of Mathematics and Natural Sciences, Surabaya State University, located at Jl Ketintang, Surabaya, East Java, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ujc.v14n1.p15-19

Abstract

The ammonia production process uses natural gas and nitrogen as raw materials with the main product being ammonia and by-product CO2. CO2 in the ammonia production process must be removed by absorption using a benfield solution and converting CO2 to CH4. Unit 144D of PT Petrokimia Gresik IB ammonia plant is poisoned by CO2 gas from the LTS (Low Temperature Shift) unit. The indication is based on the formation of deposits in the 120C cone strainer unit and it is suspected that the deposits are ammonium carbamate or ammonium carbonate. Identification was carried out using the ATR-FTIR method by comparing the sample with standard ammonium carbamate as well as with the IR spectra of ammonium carbonate and ammonium bicarbonate from the literature. The results showed that the similarity of the sample with ammonium carbamate was 87.6%. There are peaks at wave numbers 3500-3300 cm-1 showing N-H vibrations of primary amines, 1600-1700 cm-1 which shows C=O stretching vibrations. Then at 1490-1410 cm-1 which shows the presence of carbonate ions (CO32-). The wave number between 1450-1400 cm-1 shows the vibration of NH4+ ions. It is likely that the compound formed is a mixture of ammonium carbamate and ammonium carbonate because testing was not carried out to obtain the percentage of similarity of ammonium carbonate with the sample directly.

Page 10 of 10 | Total Record : 93

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