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All Journal CHEMICA Jurnal Teknik Kimia Indonesian Journal of Science and Technology Agroindustrial Technology Journal Jurnal Pendidikan dan Konseling
Joko Pitoyo
Universitas Ahmad Dahlan
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Education Energy Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mathematics Other

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The Effect of Variations of Stearin Mass and Used Cooking Oil From Purification with Activated Carbon on the Quality of The Candle Siti Jamilatun; Ikko Nirwana Luthfiani; Dita Permata Putri; Joko Pitoyo; Aster Rahayu
Agroindustrial Technology Journal Vol 6, No 1 (2022): Agroindustrial Technology Journal
Publisher : Universitas Darussalam Gontor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21111/atj.v6i1.7234

Abstract

Cooking oil is vegetable oil that has been purified and can be used as foodstuff. Consumtion of cooking oil is used as a medium for frying foodstuff, to add flavor and to form texture in bread making. Cooking oil that has been used repeatedly or commonly known as used cooking oil has a very bad impact on our body and will pollute the environment if it is not managed properly. Candles are made of paraffin, melt easily when heated, and can be used as a light source. For making candle, a chemical is added, namely stearin. The function of this stearin is to give shape fot candles because stearin will solidify once it cools. The presence of palmitic acid and stearic acid contained in stearin causes stearin to be in a solid state at room temperature. The study was conducted using 400 ml of used cooking oil which was then clarified with variations in the mass of activated carbon as much as 40, 80, and 120 grams. The clarified oil will then be analyzed for its absorbance value using a spectrophotometer uv-vis, then it will become a wax with the addition of variations in the mass of stearin as much as 50, 75, and 100 grams. The resulting candle will be tested which includes hardness, organoleptic test, flame test, and flame resistance of the candle.
Upaya Meningkatkan Keaktifan dan Hasil Belajar Tema Daerah Tempat Tinggalku Dengan Menggunakan Model Pbl Pada Siswa Kelas IV SDN Pampang I Joko Pitoyo; Roni Sulistiyono; Muryanto Muryanto
Jurnal Pendidikan dan Konseling (JPDK) Vol. 4 No. 4 (2022): Jurnal Pendidikan dan Konseling
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (234.605 KB) | DOI: 10.31004/jpdk.v4i4.5783

Abstract

Penelitian Tindakan Kelas ini berjudul Upaya Peningkatan Keaktifan dan Hasil Belajar Tema Dearah Tempat Tinggalku Menggunakan Model PBL Pada Siswa Kelas IV SDN Pampang I. Penelitian ini dilaksanakan di kelas IV SDN Pampang I, Kecamatan Paliyan, Kabupaten Gunungkidul. Penelitian ini berfokus pada keaktifan dan hasil belajar pada tema Daerah Tempat Tinggalku Kelas IV. PTK ini menggunakan dua siklus seperti yang dikemukakan oleh Mc. Taggart, dengan dua pertemuan pada setiap siklusnya. Hasil dari penelitian tindakan kelas ini adalah bahwa dengan menggunakan model pembelajaran Problem Based Learning (PBL) dapat meningkatkan keaktifan peserta didik kelas IV SD Negeri Pampang I tahun pelajaran 2021/2022. Hal ini dapat diketahui dari perolehan data dari siklus I dan siklus II. Dimana siklus I pelaksanaan model Problem based learning tercapai sebesar 81,93% dan dapat meningkatkan keaktifan sebesar 81,07 dan hasil belajar sebesar 81,29 Pada siklus II pelaksanaan model Problem based learning tercapai sebesar 83,21% dan dapat meningkatkan keaktifan sebesar 83,07 dan hasil belajar sebesar 83,5.
Bio-oil from Oil Palm Shell Pyrolysis as Renewable Energy: A Review Joko Pitoyo; Totok Eka Suharto; Siti Jamilatun
CHEMICA: Jurnal Teknik Kimia Vol 9, No 2 (2022): August 2022
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v9i2.22355

Abstract

Oil palm shell (OPS) is biomass with high carbon and hydrogen content, so it has the potential to produce renewable energy through the thermochemical method. Pyrolysis is a relatively inexpensive thermochemical method that continuously converts biomass into valuable gas, bio-oil, and char products. Bio-oil is used directly to fuel boilers and furnaces or to produce fuel oil. This article reviews the pyrolysis process of biomass from oil palm shells, discussing the operating parameters that influence the pyrolysis process and the method of upgrading bio-oil. This review shows a relationship between biomass composition (cellulose, hemicellulose, and lignin) and bio-oil yield. The water content in the raw material needs to be controlled at around 10%. The optimum particle size is closely related to the biomass's natural structure and reactor type. The higher the ash and fixed carbon content, the lower the bio-oil yield. The optimum temperature for pyrolysis is between 450-550 ºC. A high heating rate will increase the decomposition of biomass into bio-oil. Particle size and reactor type strongly influence feed rate, residence time, and reaction time. A fluidized bed reactor gives the highest bio-oil yield. Using plastic in co-pyrolysis and catalyst increases the heating value and decreases the oxygenated content.
Experimental Study on The Characterization of Pyrolysis Products from Bagasse (Saccharum Officinarum L.): Bio-oil, Biochar, and Gas Products Siti Jamilatun; Joko Pitoyo; Shinta Amelia; Alfian Ma’arif; Dhias Cahya Hakika; Ilham Mufandi
Indonesian Journal of Science and Technology Vol 7, No 3 (2022): IJOST: VOLUME 7, ISSUE 3, December 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v7i3.51566

Abstract

Sugarcane bagasse is one of the most abundant biomasses. This study aims to examine the characteristics of bagasse using a pyrolysis system to produce liquid, solid (Biochar), and gaseous. A fixed bed reactor was installed in pyrolysis with temperature variations from 300 to 600°C. The ultimate and proximate analysis was applied to evaluate the characteristic of bagasse. The experimental result found that the maximum bio-oil was obtained at a temperature of 550°C. Several characterizations were done, including gas chromatography and surface area analysis. The Levoglucosan compound of 78% area. The temperature effect on pyrolysis influenced the O/C ratio, H/C ratio, HHV value, and surface area of biochar. The High Heating Value was obtained from 16.698 to 18.496 kJ/kg. Biochar results indicated that the surface area, average pore size, and total pore volume are 180.3-198.0 m2/g, 1.42-4.33 nm, and 0.11-0.12 nm, respectively. The study also analyzed its composition in biochar.
Multi-Distributed Activation Energy Model for Pyrolysis of Sugarcane Bagasse: Modelling Strategy and Thermodynamic Characterization Siti Jamilatun; Muhammad Aziz; Joko Pitoyo
Indonesian Journal of Science and Technology Vol 8, No 3 (2023): (ONLINE FIRST) IJOST: December 2023
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v8i3.60175

Abstract

The multi-distributed activation energy model (multi-DAEM) is the most effective approach for outlining the kinetics model of biomass pyrolysis. The purpose of this study is to identify the optimal number and shape of the DAEM for sugarcane bagasse pyrolysis and to discuss its thermodynamic characteristics using the combination of multi-DAEM and differential thermal analysis (DTA). The heating rate of 10, 30, and 50 °C/min was employed. The results revealed that the multi-DAEM with five pseudo components and Weibull distribution shape gave the lowest relative root mean of the squared error (RRMSE) of 0.66% and 0.41%, respectively. Kinetic and thermodynamic studies showed that the 1st and 4th pseudo components which represent lignin, have activation energy (E0) of 189.6 and 180.6 kJ/mol, and less endothermic or possibly exothermic properties. Meanwhile, the 2nd, 3rd, and 5th pseudo components which represent cellulose, hemicellulose, and moisture have activation energy (E0) of 176.1, 152.2, and 145.6 kJ/mol, respectively, and endothermic properties.
Co-Authors Alfian Ma’arif Dhias Cahya Hakika Dita Permata Putri Ikko Nirwana Luthfiani Ilham Mufandi Muhammad Aziz Muryanto Muryanto Rahayu, Aster Roni Sulistiyono Shinta Amelia Siti Jamilatun Totok Eka Suharto