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All Journal Jurnal Penelitian Pendidikan IPA (JPPIPA) Proceeding of International Conference on Science, Education, and Technology
Muslimah Susilayati
Universitas Negeri Semarang
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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Characterization of Spent Coffee Grounds in the Community as Supporting Materials for Renewable Energy Muslimah Susilayati; Putut Marwoto; Sigit Priatmoko
Jurnal Penelitian Pendidikan IPA Vol. 8 No. 2 (2022): April
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v8i2.1227

Abstract

Coffee grounds are a by-product of the coffee brewing process. Currently, coffee grounds in the community are still untapped waste. Whereas spent coffee grounds has the potential to be converted into various high value bio-products that are environmentally friendly. This study aims to characterize coffee grounds waste which is popular in the community as a supporting material for renewable energy. This study uses a comparative method of 3 samples of Arabica coffee grounds (SCG-A), Robusta (SCG-R), and the Arabica-Robusta blend (SCG-AR) from coffee brands that are popular in Indonesian. Quantitative analysis was carried out by comparing the percentage of residual yield of the three samples. Qualitative characterization of coffee grounds was carried out using the FTIR 8300/8700 Spectrophotometer. The results of the three samples showed different rendemen values, namely 70% SCG-A, 60% SCG-R, and 80% SCG-AR. The FTIR test results showed that the three spent coffee grounds had the same functional group characteristics in the frequency range of 650–3900 cm-1. The detection of the hydroxyl functional group (-OH), the asymmetric strain of the CH bond of the methyl group (-CH3), and the stretching vibration of CO in the COH bond found in coffee grounds waste shows its potential as a supporting material for renewable energy if a further process is carried out in the form of pyrolysis/calcination at room temperature. 700◦C. Utilization of spent coffee grounds in the community can be done by establishing a Spent Coffee Grounds Bank (SCG Bank), educating the public so that they are willing to donate spent coffee grounds, and managing SCG as a supporting material for renewable energy.
An Ethnoastronomy Learning Progression (eALP): Scientific Literacy Skills As The Progress Dimensions Muslimah Susilayati; Wahyu Hardyanto; Supriyadi Supriyadi; Arif Widiyatmoko
International Conference on Science, Education, and Technology Vol. 8 (2022)
Publisher : Universitas Negeri Semarang

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Abstract

Abstrak. Astronomy which studies natural phenomena related to the motion of celestial bodies is one of the study materials that undergraduates in science education need to master. In this digital era, to study the relative motion of celestial bodies observed from the earth, various skills are needed and supported by the right technology. The author proposes scientific literacy skills as a dimension of progress in the ethnoastronomy learning progression of the earth's seasons for the science program undergraduate program. Scientific literacy skills have three dimensions, namely scientific concepts, scientific process, and scientific context. Scientific concepts are needed to understand the phenomenon of changing seasons on earth with the support of the Stellarium application. Scientific processes are centered on the ability to obtain, interpret, and act on evidence of the phenomenon of changing seasons on earth in five scientific processes, namely recognizing scientific questions, identifying evidence, drawing conclusions, communicating conclusions, and demonstrating scientific understanding. Scientific context can be bridged through ethnoastronomy related to seasonal changes by studying the regional calendar/student residence, for example, Pranatamangsa. Students' astronomical learning progress can be defined by the increasing sophistication of their scientific literacy skills. An ethnoastronomical learning progression (eALP) framework has been developed and discussed in this paper.
Co-Authors Arif Widiyatmoko, Arif Putut Marwoto Sigit Priatmoko Supriyadi Supriyadi Wahyu Hardyanto