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All Journal Jurnal Teknik Kimia USU Jurnal Teknik Kimia USU Tsaqofah: Jurnal Penelitian Guru Indonesia
Muhammad Iqbal Pratama
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Chemical Engineering, Chemistry & Bioengineering Chemistry Education Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Pemanfaatan Limbah Kulit Buah dan Sayur Sebagai Bahan Bakar Bioetanol dengan Variasi Konsentrasi Katalis Eva Agustina; Gita Ika Safitri; Irssa Intan Fatiha; Muhammad Iqbal Pratama; Rahmania; Ria Safitri; Funsu Andiarna; Irul Hidayati
Jurnal Teknik Kimia USU Vol. 10 No. 1 (2021): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v10i1.4552

Abstract

Fossil fuels are included as non-renewable energy sources, so its presence in Indonesia is decreasing. One of the renewable energy sources that can be obtained easily is bioethanol, this energy is obtained from organic materials containing cellulose fibers. Cellulose is hydrolyzed on a catalyst and fermented to obtain bioethanol. The aim of this study was to determine the effect of variations in the concentration of catalysts in the production of bioethanol from market organic waste (fruit peels and vegetables). There are three stages of converting organic waste into bioethanol, including converting green vegetables waste and fruit peels (polysaccharides / cellulose) into monosaccharides (simple sugars) through a hydrolysis process followed by a fermentation process using Saccharomyces cerevisiae and EM4, then separating ethanol and water using a distillation process. The resulting products are analyzed using a quantitative test to determine density and a qualitative test to determine color change. The results showed that the ethanol obtained from the addition of H2SO4 catalyst with concentrations of 0.5% and 1% had almost the same specifications as standard ethanol based on density calculations and color change tests. The highest ethanol yield percentage was obtained from the concentration of H2SO4 1%.
Pemanfaatan Limbah Kulit Buah dan Sayur Sebagai Bahan Bakar Bioetanol dengan Variasi Konsentrasi Katalis Eva Agustina; Gita Ika Safitri; Irssa Intan Fatiha; Muhammad Iqbal Pratama; Rahmania; Ria Safitri; Funsu Andiarna; Irul Hidayati
Jurnal Teknik Kimia USU Vol. 10 No. 1 (2021): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (217.806 KB) | DOI: 10.32734/jtk.v10i1.4552

Abstract

Fossil fuels are included as non-renewable energy sources, so its presence in Indonesia is decreasing. One of the renewable energy sources that can be obtained easily is bioethanol, this energy is obtained from organic materials containing cellulose fibers. Cellulose is hydrolyzed on a catalyst and fermented to obtain bioethanol. The aim of this study was to determine the effect of variations in the concentration of catalysts in the production of bioethanol from market organic waste (fruit peels and vegetables). There are three stages of converting organic waste into bioethanol, including converting green vegetables waste and fruit peels (polysaccharides / cellulose) into monosaccharides (simple sugars) through a hydrolysis process followed by a fermentation process using Saccharomyces cerevisiae and EM4, then separating ethanol and water using a distillation process. The resulting products are analyzed using a quantitative test to determine density and a qualitative test to determine color change. The results showed that the ethanol obtained from the addition of H2SO4 catalyst with concentrations of 0.5% and 1% had almost the same specifications as standard ethanol based on density calculations and color change tests. The highest ethanol yield percentage was obtained from the concentration of H2SO4 1%.
Pengaruh Motivasi dan Minat Belajar terhadap Hasil Belajar Siswa pada Mata Pelajaran Dasar-dasar Kejuruan Desain Komunikasi Visual di SMK Negeri 1 Batipuh Muhammad Iqbal Pratama; Rizkayeni Marta
TSAQOFAH Vol 5 No 4 (2025): TSAQOFAH: Jurnal Penelitian Guru Indonesia
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/tsaqofah.v5i4.6541

Abstract

This study is grounded in the recognition of the importance of internal factors such as learning motivation and interest in supporting students' academic achievement, particularly in the subject of Basic Vocational Competencies in Visual Communication Design at vocational high schools (SMK). The purpose of this study is to examine the influence of learning motivation and interest on the academic performance of Grade X students in the Visual Communication Design program at SMK Negeri 1 Batipuh. A quantitative approach with a correlational method was employed. The sample consisted of 62 students selected from the entire population of Grade X students. Data were collected using a closed-ended questionnaire previously tested for validity and reliability, and documentation of Mid-Semester Examination (UTS) scores. Data analysis was conducted using IBM SPSS Statistics 2024. The results indicate that students’ motivation and learning interest are in the good category and have a strong, significant relationship with academic achievement, both individually and collectively, with a multiple correlation value of 0.867. The study concludes that learning motivation and interest exert a positive and significant influence on students’ academic performance. These findings imply the necessity of instructional strategies that foster student motivation and interest as a means to enhance academic achievement in vocational education.
Co-Authors Eva Agustina Funsu Andiarna Gita Ika Safitri Irssa Intan Fatiha Irul Hidayati Rahmania RIA SAFITRI Rizkayeni Marta