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All Journal KOVALEN: Jurnal Riset Kimia JMM (Jurnal Masyarakat Mandiri) Jurnal Sains dan Teknologi Jurnal Bakti Nusantara Journal of Chemistry Sciences and Education
Pangestika, Inten
D4 Teknologi Rekayasa Kimia Industri, Politeknik Negeri Medan
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Evaluating the Potential of Modified Niobium (V) Oxide as Catalyst for 5-Hydoxymethylfurfural (HMF) Production : A Literature Review Inten Pangestika; Imas Masriah; Devi Lestari; Ayu Syufiatun Br Tarigan; Pina Budiarti Pratiwi
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 3 (2025): Juni 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i3.5385

Abstract

Selectively producing 5-hydroxymethylfurfural (HMF) from biomass-derived carbohydrates is key in valorizing renewable resources into biobased chemicals and fuels. HMF is a crucial bio-based platform chemical, but its selective production from glucose and fructose remains challenging due to side reactions and product degradation. Modified niobium(V) oxide (Nb2O5) catalysts have shown great promise owing to their intrinsic Brøntsted and Lewis acidity, thermal stability, and surface tunability. This review overviews recent advances in catalyst design, including metal doping, structural tuning, and hybridization with porous materials. These have significantly improved HMF yields -up to 80%- while enhancing catalyst selectivity and reusability. A systematic review with a descriptive-analytical approach was applied, analyzing literature from 2015 to 2025 across major scientific databases. Furthermore, challenges, including side-product formation and active site leaching, are highlighted alongside future perspectives for scalable and green HMF synthesis using Nb-based catalysts. This review aims to guide the rational development of modified Nb2O5 catalysts for efficient biomass transformation. These developments are crucial for advancing Nb-based catalytic platforms and unlocking the full potential of HMF in a circular, bio-based chemical industry.
Sosialisasi Penggunaan Workbook sebagai Bahan Ajar Pendukung pada Materi Zat Aditif dan Adiktif dalam Pembelajaran IPA Sani, Sulwiyatul Kamariyah; Pangestika, Inten; Mahmudha, Siti; Pratiwi, Pina Budiarti; Sapitri, Shally
Jurnal Bakti Nusantara Vol. 2 No. 3 (2025): Jurnal Bakti Nusantara
Publisher : Pustaka Media Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63763/jbn.v2i3.91

Abstract

Kegiatan sosialisasi penggunaan workbook sebagai bahan ajar pendukung pada materi zat aditif dan adiktif dalam pembelajaran IPA dilaksanakan di SMPN 28 Mukomuko dengan tujuan untuk meningkatkan pemahaman dan keterlibatan siswa dalam proses belajar. Materi zat aditif dan adiktif merupakan salah satu materi yang topik pengetahuannya terlalu luas sehingga membutuhkan pendekatan pembelajaran yang konstektual dan interaktif. Melalui kegiatan ini, siswa-siswi diperkenalkan pada penggunaan workbook yang disusun secara sistematis seperti materi yang spesifik, soal evaluasi yang menarik, serta kumpulan istilah-istilah sains yang dapat digunakan peserta didik sebagai bahan ajar pendukung. Hasil dari sosialisasi menunjukkan bahwa penggunaan workbook dapat mendorong siswa untuk lebih aktif, mandiri, dan kritis dalam memahami materi. Siswa memberikan respon positif terhadap format dan isi workbook, serta menunjukkan minat yang lebih tinggi dalam mengikuti proses pembelajaran yang dibuktikan dengan adanya peningkatan pemahaman siswa terkait materi zat aditif dan adiktif berdasarkan hasil pre-test dan post-test. Kegiatan ini diharapkan menjadi langkah awal dalam penerapan media pembelajaran yang lebih efektif dan dapat menarik minat belajar peserta didik serta dapat meningkatkan kualitas pembelajaran IPA di sekolah.
Reevaluasi Miskonsepsi Struktur Atom Dan Partikel Subatom Serta Implikasinya Terhadap Pemahaman Ilmiah: Studi Literatur Moneteringtyas, Prisca Caesa; Meidita Kemala Sari; Inten Pangestika; Dini Novi Rohmah; Imas Masriah
Journal of Chemistry Sciences and Education Vol 2 No 01 (2025): Journal of Chemistry Sciences and Education
Publisher : PT. Pubsains Nur Cendekia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69606/jcse.v2i01.229

Abstract

Misconceptions about atomic structure and subatomic particles are a systemic issue in chemistry education, hindering the understanding of advanced concepts and limiting critical thinking. This study aims to identify common misconceptions, explore their root causes, and propose effective corrective strategies. A literature review of 20 peer-reviewed articles was conducted using thematic analysis across three main focuses. Findings reveal that deterministic views of the Bohr model, confusion over technical terms, and misinterpretation of symbolic representations are the most prevalent misconceptions. These stem from unadaptive teaching methods, cognitive limitations, and misleading visuals. Effective remedies include cognitive conflict, dynamic visualizations, and historical-metacognitive approaches to support conceptual change and deepen scientific understanding.
PELATIHAN PEMBUATAN LILIN AROMATERAPI DALAM PENINGKATAN KREATIVITAS SISWA SMAN 1 KASONGAN Oksal, Efriyana; Fatah, Abdul Hadjranul; Chuchita, Chuchita; Pereiz, Zimon; Fauzi, M. Zainuddin Lutfi; Komara, Nisa Kartika; Pangestika, Inten
JMM (Jurnal Masyarakat Mandiri) Vol 9, No 2 (2025): April
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jmm.v9i2.29185

Abstract

Abstrak: Pelatihan pembuatan lilin aromaterapi memiliki peran penting dalam meningkatkan keterampilan praktis dan kreativitas siswa. Kegiatan ini bertujuan untuk meningkatkan kemampuan hardskill siswa dalam pembuatan lilin aromaterapi, sehingga mereka memiliki bekal keterampilan yang dapat diterapkan dalam kehidupan sehari-hari maupun sebagai peluang wirausaha. Metode pelatihan yang digunakan meliputi pemberian materi secara ceramah dan praktik langsung pembuatan lilin aromaterapi. Peserta kegiatan ini adalah 80 siswa/i dari SMAN 1 Kasongan. Diakhir kegiatan pelatihan dilakukan evaluasi dengan pengisian angket oleh peserta untuk menilai pemahaman dan keterampilan yang diperoleh selama pelatihan. Hasil evaluasi menunjukkan bahwa 81,25% peserta memahami metode pembuatan lilin aromaterapi, sedangkan 90% peserta mampu membuat lilin aromaterapi secara mandiri. Dengan demikian, pelatihan ini terbukti efektif dalam meningkatkan keterampilan praktis dan kreativitas siswa.Abstract: The aromatherapy candle-making training plays an important role in enhancing students' practical skills and creativity. This activity aims to enhance students' hard skills in making aromatherapy candles, so they have a set of skills that can be applied in daily life as well as entrepreneurial opportunities. The training methods used include lectures and hands-on practice in making aromatherapy candles. The participants of this activity are 80 students from SMAN 1 Kasongan. At the end of the training activities, an evaluation was conducted with participants filling out a questionnaire to assess the understanding and skills acquired during the training. The evaluation results show that 81.25% of the participants understand the method of making aromatherapy candles, while 90% of the participants are able to make aromatherapy candles independently. Thus, this training has proven effective in enhancing students' practical skills and creativity.
XRD-Based Structural and Crystallite Size Analysis of Nano-MgO Prepared via Sol–gel Method Masriah, Imas; Lestari, Devi; Sani, Sulwiyatul Kamariyah; Pangestika, Inten; Miswanda, Dikki
KOVALEN: Jurnal Riset Kimia Vol. 11 No. 2 (2025): December Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2025.v11.i2.17909

Abstract

Nano-MgO was synthesized via a nitrate–citrate sol–gel combustion method, in which magnesium nitrate acted as the oxidizing precursor and citric acid served simultaneously as the chelating agent and organic fuel. The formation of a homogeneous Mg–citrate coordination network enabled controlled gelation, while the auto-combustion process produced a porous MgO matrix composed of ultrafine crystallites. Calcination at 800 °C promoted phase consolidation, removal of organic residues, and enhanced long-range atomic ordering. X-ray diffraction confirmed the exclusive formation of the cubic periclase phase (fm3m), with no detectable hydroxide or carbonate impurities. Crystallite size analysis yielded an average size of 16.03 nm based on the Scherrer equation, whereas the Williamson–Hall method produced a larger value of 25.44 nm with a microstrain of 5.37 × 10-4. indicating minimal lattice distortion. The discrepancy between the two size estimates reflects the contribution of microstrain effect not considered in the Scherrer approach. Overall, the synthesized nano-MgO exhibits high crystallinity, narrow crystallite size distribution, and excellent structural stability, highlighting its potential for catalytic, gas-sensing, and high-temperature functional applications. These results demonstrate that the sol–gel combustion method is an efficient and reliable strategy for producing nanocrystalline MgO with well-controlled structural characteristics.
Co-Authors Ayu Syufiatun Tarigan Chuchita, Chuchita Devi Lestari Dikki Miswanda Dini Novi Rohmah Fatah, Abdul Hadjranul Fauzi, M. Zainuddin Lutfi Imas Masriah Komara, Nisa Kartika Meidita Kemala Sari Oksal, Efriyana Pratiwi, Pina Budiarti Prisca Caesa Moneteringtyas Sapitri, Shally Siti Mahmudha Sulwiyatul K Sani Zimon Pereiz