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All Journal Cakrawala Pendidikan Molekul: Jurnal Ilmiah Kimia Pancaran Pendidikan
Sentot Budi Rahardjo
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Humanities Chemical Engineering, Chemistry & Bioengineering Chemistry Education Languange, Linguistic, Communication & Media Physics

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Electro-Synthetic Optimization of Host Material Based on MIL-100(Fe) Witri Wahyu Lestari; Joni Hartono; Marisa Adreane; Khoirina Dwi Nugrahaningtyas; Candra Purnawan; Sentot Budi Rahardjo
Molekul Vol 11, No 1 (2016)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (759.812 KB) | DOI: 10.20884/1.jm.2016.11.1.195

Abstract

Electro-synthesis of Metal-Organic Frameworks types of MIL-100(Fe) (MIL = Material Institute of Lavoisier) in ethanol: water (1: 1) with electrolyte TBATFB 0.1 M has been optimized by varying voltage (12, 13, 14 and 15 Volt) and temperature (room temperature, 40, 60 and 80 °C). The product showed light brown powder which upon activation becomes dark brown. Optimum condition achieved during use voltage of 15 Volts and at a temperature of 40 °C with 33% yield. The obtained material was characterized by XRD and compared to CCDC 640536 simulated patterns to confirm the phase purity of the product. As comparison hydrothermal and reflux method have been carried out. Characterization by FTIR has also undertaken to ensure the coordination between the metal cation (Fe3+) and the BTC ligand (BTC = 1,3,5-Benzene Tri Carboxylate). Meanwhile pore analysis using SAA confirmed that MIL-100(Fe) obtained by electrolysis method has a BET surface area reached till 569.191 m²/g with a total pore volume of 0.4540 cc/g and an average pore diameter reached 16 Å. Based on SEM analysis, morphology material show particle size between 0.4-8.6 μm and has a thermal stability up to 350 °C according thermo-gravimetric analysis. Due to the presence of Lewis acid sites on Fe-trimeric unit, porosity features on MIL-100(Fe) and a fairly high thermal stability, this material is potentially used as the host material for the catalyst in the conversion reactions model for green diesel production.
Empowering critical thinking skills on different academic levels through discovery-based multiple representation learning Muhammad Minan Chusni; Sulistyo Saputro; Suranto Suranto; Sentot Budi Rahardjo
Jurnal Cakrawala Pendidikan Vol 41, No 2 (2022): Cakrawala Pendidikan (June 2022)
Publisher : LPMPP Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/cp.v41i2.41105

Abstract

Critical Thinking Skills (CTSs) are necessary for science mastery. To help the students develop their CTSs, discovery-based learning and student-centered activities may be beneficial. This study aims at investigating: (1) effects of discovery-based multiple representation learning (DMRL) model on CTSs; (2) effects of different academic achievement on CTSs; and (3) interaction between a learning model and types of different academic achievement on CTSs. The participants were 162 students, grade 7th from 3 public schools in Sleman, Indonesia. They were classified into 54 students with exceptional academic achievement, 48 students with average academic achievement, and 60 students with below-average intellectual ability. We used an essay test to collect data on CTSs utilizing a non-equivalent control group design with pretest and posttest. ANCOVA was used to examine the data (p = .05). The results of the study show that: (1) The DMRL had a high potential to improve the students’ CTSs; (2) The students with HA had the highest CTSs; (3) there is an interaction effect between the learning model and the different types of achievement on CTS. As a result, we conclude that the DMRL was effective in closing the CTSs discrepancies between students with high, moderate, and poor academic achievement.
Analysis Of Secondary School Students’ Critical Thinking Skill In Learning Energy In Living System Turino Adi Irawan; Sentot Budi Rahardjo; Sarwanto Sarwanto
Pancaran Pendidikan Vol 6, No 4 (2017)
Publisher : The Faculty of Teacher Training and Education The University of Jember Jember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (228.488 KB) | DOI: 10.25037/pancaran.v6i4.79

Abstract

This study tried to describe the energy in daily life learning to train students' critical thinking skills. Improving critical thinking through learning in school is an effort in enlightening the quality of national education and Indonesian students' readiness to face the globalisation era which is full of challenge and sense of climate’ life that are very competitive. It was important to investigate the learning of energy in living systems in order to train the critical thinking skills because nowadays energy becomes a global issue which relates to the future life. This study utilised a qualitative method. The data were collected by the teacher’s documentation and depth interview. The data were then analysed, described, and interpreted comprehensively. Data analysis result gotten the teacher did not instruct and concentrate yet to the critical thinking. The root problem was the teacher did not show that learning guideline and comprehension that can lead to student critical thinking.
Co-Authors Aminuyati Candra Purnawan Cari Cari Cecep Kusmana Irawan, Turino Adi Joni Hartono Khoirina Dwi Nugrahaningtyas Kuatna Muchsin Nugroho Marisa Adreane Mohammad Masykuri Muhammad Minan Chusni Novi Hendrastuti Sajidan Sajidan Sarwanto Sarwanto Siti Patonah Siti Patonah Sulistyo Saputro Suranto Suranto Witri Wahyu Lestari