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All Journal Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) Jurnal Bio-Geo Material Dan Energi Jurnal Sains dan Teknologi Jurna Beta Kimia Jurnal Bakti Nusantara Nexus
Pratiwi, Pina Budiarti
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Pembelajaran Berbasis Masalah Erosi Email Gigi untuk Meningkatkan Kemampuan Penalaran dan Keterampilan Berpikir Kritis Pina Budiarti Pratiwi; chansyanah Diawati; Marina Setyorini
Jurnal Pendidikan dan Pembelajaran Kimia Vol 7, No 2 (2018): Jurnal Pendidikan dan Pembelajaran Kimia
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (312.371 KB)

Abstract

This study aims to describe the improvement of the students' reasoning and critical thinking skills through dental erosion problem based learning. The samples were taken using purposive sampling technique and obtained XI MIA 3 as experiment class and XI MIA 9 as control class. The enhancement of reasoning ability and students' critical thinking skills is determined by the n-gain of reasoning ability and critical thinking skills of students tested statistically by t test. The results showed that dental erosion problem based learning can improve students' reasoning ability and critical thinking skill.Penelitian ini bertujuan untuk mendeskripsikan peningkatan kemampuan penalaran dan keterampilan berpikir kritis siswa melalui pembelajaran berbasis masalah erosi email gigi.  Sampel penelitian diambil menggunakan teknik purposive sampling dan diperoleh kelas XI MIA 3 sebagai kelas eksperimen dan kelas XI MIA 9 sebagai kelas kontrol di SMA Negeri 2 Bandar Lampung.  Peningkatan kemampuan penalaran dan keterampilan berpikir kritis siswa ditentukan dari n-gain kemampuan penalaran dan keterampilan berpikir kritis siswa yang diuji secara statistik dengan uji t.  Hasil penelitian menunjukkan bahwa pembelajaran berbasis masalah erosi email gigi mampu meningkatkan kemampuan penalaran dan keterampilan berpikir kritis siswa.Kata kunci : pembelajaran berbasis masalah, erosi email gigi, keterampilan berpikir kritis, kemampuan penalaran
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.
XRD Characterization and Structural Insights of Activated Carbon-ZnO Composite for Potential Photocatalytic Applications Lestari, Devi; Masriah, Imas; Hasibuan, Adelia Yesya Putri; Pratiwi, Pina Budiarti
Jurnal Beta Kimia Vol 5 No 2 (2025): Volume 5 Number 2, November 2025
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/jbk.v5i2.25811

Abstract

This study presents a structural characterization of an activated carbon-ZnO (AC/ZnO) composite synthesized via a simple sol-gel route using activated carbon derived from oil palm empty fruit bunches (OPEFB), introducing a sustainable biomass based carbon source as a functional photocatalytic support. X-ray diffraction (XRD) analysis revealed sharp diffraction peaks corresponding to the wurtzite ZnO phase, together with a broad amorphous carbon halo, confirming the successful incorporation of crystalline ZnO within the carbon matrix. Microstructural parameters, including crystallite size, lattice strain, and dislocation density, indicate nanoscale structural ordering accompanied by beneficial defect sites that promote charge trapping. Structural interpretation was further validated through Rietveld refinement, which confirmed a single-phase ZnO structure with good fitting quality, demonstrating the structural stability and compatibility of ZnO within the carbon framework. Photocatalytic evaluation using methylene blue showed a higher removal efficiency under natural sunlight (95%) compared to dark adsorption (85%), evidencing a synergistic adsorption-photocatalysis mechanism. The novelty of this work lies in integrating low temperature sol–gel synthesis, waste derived activated carbon, and XRD based microstrain and refinement analyses to establish a clear structure–function relationship in AC/ZnO composites. These findings highlight the practical potential of this material as a low cost, scalable, and solar responsive photocatalyst for sustainable wastewater treatment applications, particularly in resource limited and tropical regions.
Studi Komparatif Pengaruh Jenis Pelarut terhadap Pembentukan dan Karakteristik Nanopartikel ZnO Berbasis Ekstrak Daun Parthenium hysterophorus L. Rahmat, Nahzim; Moneteringtyas, Prisca Caesa; Pratiwi, Pina Budiarti
Nexus Sains dan Teknologi Vol. 1 No. 2 (2025): Nexus: Jurnal Sains dan Teknologi
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/nst.v1i2.2885

Abstract

Penelitian ini bertujuan untuk menyelidiki pengaruh jenis pelarut terhadap karakteristik nanopartikel ZnO yang disintesis menggunakan ekstrak daun Parthenium hysterophorus L. sebagai agen pereduksi alami. Ekstrak daun direndam dengan dua pelarut yaitu metanol atau aquabides selama 24 jam dan digunakan sebagai agen pereduksi dalam sintesis ZnO. Endapan yang dihasilkan dikeringkan, dikalsinasi pada 600 °C, dan dikarakterisasi menggunakan FTIR serta XRD. Hasil analisis FTIR menunjukkan adanya pita serapan O–H pada 3318 cm⁻¹ pada sampel B yang tidak muncul pada sampel A. Hal ini mengindikasikan bahwa keberadaan gugus hidroksil sisa yang lebih dominan pada sintesis berbasis air. Sementara itu, hasil XRD mengonfirmasi bahwa kedua sampel memiliki struktur kristal ZnO heksagonal tipe wurtzite (JCPDS No. 36-1451) dengan puncak utama pada 2θ sekitar 31,7°, 34,4°, dan 36,3°. Ukuran kristalit yang dihitung menggunakan persamaan Scherrer menunjukkan nilai rata-rata sekitar 41 nm untuk sampel A dan 28 nm untuk sampel B. Hasil ini menunjukkan bahwa metanol menghasilkan kristal ZnO yang lebih besar, sedangkan air menghasilkan kristalit lebih kecil dengan strain kisi lebih tinggi.
FTIR Analysis of ZnO-Functionalized Activated Carbon Derived from Oil Palm Empty Fruit Bunches for Potential Photocatalytic Applications Lestari, Devi; Masriah, Imas; Hasibuan, Adelia Yesya Putri; Pratiwi, Pina Budiarti
Jurnal Bio-Geo Material Dan Energi Vol. 6 No. 1 (2026): Vol. 6 No. 1 (2026): Journal of Bio-Geo Material and Energy (BiGME), February 2
Publisher : PUI BiGME Universitas Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study investigates the surface chemical characteristics of ZnO-functionalized activated carbon (AC) derived from oil palm empty fruit bunches (OPEFB) using Fourier Transform Infrared (FTIR) spectroscopy. Activated carbon was prepared through carbonization at 400 °C followed by chemical activation using KOH. ZnO functionalization was performed via the sol–gel method with a nominal ZnO loading of 10 wt% relative to AC. FTIR analysis revealed dominant absorption bands corresponding to O–H stretching (~3430 cm⁻¹), C=O stretching (~1630 cm⁻¹), and C–O vibrations (~1050–1100 cm⁻¹), indicating the presence of oxygen-containing surface functional groups. The appearance of a characteristic Zn–O vibrational band in the 450–600 cm⁻¹ region confirmed the incorporation of ZnO within the composite structure. Minor peak shifts and variations in band intensity observed after ZnO modification suggest changes in the local chemical environment and possible interactions between ZnO nanoparticles and oxygen-containing functional groups. However, FTIR analysis alone does not provide definitive confirmation of specific interfacial bonding configurations. The results indicate that KOH activation preserved reactive oxygenated functionalities that remained stable after ZnO incorporation. The coexistence of porous AC characteristics and ZnO-associated vibrational features suggests that the synthesized AC/ZnO composite possesses surface chemical properties relevant for adsorption-assisted photocatalytic applications. This work demonstrates the potential valorization of OPEFB biomass into functional carbon-based hybrid materials.
Co-Authors Ayu Syufiatun Tarigan Chansyanah Diawati Devi Lestari Hasibuan, Adelia Yesya Putri Imas Masriah Marina Setyorini Pangestika, Inten Prisca Caesa Moneteringtyas Rahmat, Nahzim Sapitri, Shally Siti Mahmudha Sulwiyatul K Sani