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All Journal Jurnal Inovasi Pembelajaran Kimia (Journal Of Innovation in Chemistry Education) Didaktika: Jurnal Kependidikan Cendikia : Media Jurnal Ilmiah Pendidikan JURNAL TUNAS PENDIDIKAN Unesa Journal of Chemistry Jurnal Pendidikan dan Pembelajaran Kimia (JPPK)
Nurfajriani
Universitas Negeri Medan
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Energy Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Social Sciences Other

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Manufacture and Characterization of Physical Properties of Composites Based on Coconut Fiber Composition (Cocofiber) Peggy Ananda Putri Adi Yunita; Nurfajriani
Jurnal Pendidikan dan Pembelajaran Kimia Vol. 14 No. 2 (2025): Jurnal Pendidikan dan Pembelajaran Kimia
Publisher : Universitas Lampung

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Abstract

Manufacture and Characterization of Physical Properties of Composites Based on Coconut Fiber Composition (Cocofiber). This study aims to analyze the quality of coconut fiber reinforced composites through evaluation of physical properties including density, porosity, and water content. The composites were made using coconut fiber modified by immersion in 5% NaOH, epoxy resin as a matrix, and MEKPO catalyst using the hand lay-up method. Five variations of resin:fiber volume composition were used, namely 95:5%, 85:15%, 75:25%, 65:35%, and 55:45%. The results showed that the composite with 5% fiber content produced optimal performance with the highest density (0.94 g/cm³), the lowest porosity (22%), and the lowest water content (0.57%). Increasing fiber content tended to decrease density but increase porosity and water content, indicating that low fiber compositions resulted in better fiber-matrix bonding and potentially superior mechanical properties.
PEMANFAATAN SENYAWA KOMPLEKS FE KELAT (EDTA, DTPA, EDDHA, AMINO) DALAM BIDANG PERTANIAN: SEBUAH TINJAUAN Hanisah Hasibuan; Anjany Tasya Br Tarigan; Iis Siti Jahro; Nurfajriani
Unesa Journal of Chemistry Vol. 14 No. 2 (2025): Vol 14 No 2 (2025)
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.v14n2.p41-49

Abstract

This study discussed the use of iron (Fe) complex compounds in the form of chelates such as EDTA, DTPA, EDDHA, and amino chelates to overcome Fe deficiency in plants. Fe deficiency often occurs in soils with high pH or calcareous soils, which can be seen from chlorosis in leaves and decreased productivity. This study was aimed to review the synthesis, stability, agronomic effectiveness, and environmental impact of various types of Fe chelates. The methods used in this study were literature studies, with data sources covering articles from 2016 to 2025, with a particular focus on articles discussing the use of Fe chelates in plants. The findings of this study indicated that Fe-EDTA works well at low to moderate pH levels but is less stable in alkaline soils. Fe-DTPA showed moderate stability up to pH 7, while Fe-EDDHA had high stability even at pH 9, making it more suitable for calcareous soils. More environmentally friendly alternatives such as Fe-amino chelates have been proven to be more easily absorbed, have a positive impact on the environment, and also function as biostimulants. Therefore, further research is recommended to explore the development of environmentally friendly and effective Fe-chelates in alkaline soils to reduce residues from synthetic materials.
ANALISIS KEBUTUHAN PENGEMBANGAN LKPD BERBASIS AKM TERINTEGRASI NILAI RELIGIUS UNTUK MENINGKATKAN PEMBELAJARAN HIDROKARBON Dana Merina; Ayi Darmana; Nurfajriani
Jurnal Tunas Pendidikan Vol. 8 No. 2 (2026): JURNAL TUNAS PENDIDIKAN
Publisher : LPPM Universitas Muhammadiyah Muara Bungo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52060/pgsd.v8.i2.3320

Abstract

This study aims to analyze the needs of teachers and students for the development of Learner Worksheets (LKPD) based on Minimum Competency Assessment (AKM) integrated with religiosity values in learning chemistry on hydrocarbon material. The background of this research is based on the low learning outcomes of students, the weak integration of character values in learning, and the unoptimal use of LKPDs that support mastery of literacy, numeracy, and the cultivation of moral values. The research method used is a qualitative descriptive approach at the analysis stage of the ADDIE model. Data were obtained through interviews and questionnaires distributed to teachers and students of grade XI high school. The results of the analysis show that the LKPD that has been used so far is still textual, has not developed aspects of critical and reflective thinking according to the demands of AKM, and has not accommodated the strengthening of religious character. Teachers expressed the importance of developing LKPDs that integrate religious values such as honesty, responsibility, and gratitude for God's creation in science materials. Meanwhile, students want teaching materials that are interactive, contextual, and value-inspiring. Therefore, it is necessary to develop an AKM-based LKPD that not only improves understanding of hydrocarbon material, but also strengthens the religious character of students as a whole in accordance with the Pancasila Student Profile.
Co-Authors Ajat Sudrajat Anjany Tasya Br Tarigan Aulia Hutasuhut Ayi Darmana Dana Merina Elisabeth Frenklin Pangaribuan Fatma Harian Dini HANISAH HASIBUAN Iis Siti Jahro Ira Fransiska Sibarani Lera Sani Damah Putri Meilani Azizah Murniaty Simorangkir Oddy Azis Saputra Peggy Ananda Putri Adi Yunita Rama Cahaya Situngkir Ramlan Silaban Rizka Putri Iranda Samuel Santri Angelia Damanik Tini Sulastri Vesa Veorrela Winarti Zainuddin Muchtar