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All Journal Jurnal Pendidikan dan Pembelajaran Kimia (JPPK) Jurnal Sains dan Teknologi
Pina Budiarti Pratiwi
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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.
Co-Authors Ayu Syufiatun Br Tarigan Chansyanah Diawati Devi Lestari Imas Masriah Inten Pangestika Marina Setyorini