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All Journal Jurnal Ilmu Dasar PROSIDING SEMINAR KIMIA Jurnal Kimia Mulawarman Jurnal Informatika Upgris Jurnal Zarah JURNAL ATOMIK Jurnal Ilmiah Bening : Belajar Bimbingan Dan Konseling JURNAL VISIONIDA Zonasi: Jurnal Sistem Informasi Gadjah Mada Journal of Tourism Studies Abdi Laksana : Jurnal Pengabdian Kepada Masyarakat Journal of Physical Activity and Sports (JPAS) JUMORA: Jurnal Moderasi Olahraga Jurnal Impresi Indonesia Jurnal Interkom : Jurnal Publikasi Ilmiah Bidang Teknologi Informasi dan Komunikasi Dirgamaya: Jurnal Manajemen dan Sistem Informasi JURNAL MANAJEMEN MODAL INSANI DAN BISNIS (JMMIB) INOTEK Akademika : Jurnal Pemikiran Islam Lembaran Antropologi Karimah Tauhid Journal Of Carbazon
RAHMAT GUNAWAN
Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman
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Journal : PROSIDING SEMINAR KIMIA

 1 
STUDY KINETIC PYROLYSIS OF ULIN WOOD POWDER USING THERMOGRAVIMETRIC ANALYSIS Adha, Dhea Nur; Subagyono, R.R. Dirgarini; Gunawan, Rahmat
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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A kinetic study of ironwood powder pyrolysis using thermogravimetric analysis has been conducted. This study aims to determine the thermal decomposition process and determine the activation energy value of ironwood powder pyrolysis using the free Kissinger-Akahira-Sunose (KAS) and Friedman models. Pyrolysis in this study used heating rates of 10, 15, 20, and 25 ºC/minute. The active temperature range of ironwood powder pyrolysis was 130.88 – 552.21ºC. The thermal decomposition process occurred in three stages, namely 1. evaporation of water or moisture, 2. active pyrolysis for the decomposition of hemicellulose, cellulose and lignin compounds, and 3. passive pyrolysis caused by gasification and the formation of non-volatile carbon compounds which evaporate to form CO and CO2 gases at high temperatures. The average activation energy of the pyrolysis of ironwood powder using the Kissinger-Akahira-Sunose (KAS) and Friedman methods were 137.34 ± 30.05 kJ/mol and 147.83 ± 36.66 kJ/mol, respectively. Keywords: Kinetic Study, Iron Wood Powder, Thermogravimetric Analysis
PYROLYSIS OF ULIN (Eusideroxylon zwageri) SAWDUST IN THE PRESENCE OF NI/SBA-15 USING A PYROLYSIS-GAS CHROMATOGRAPHY-MASS SPECTROSCOPY (PY-GC/MS) Marsella, Yuni; Subagyono, R. R Dirgarini J.N.; Gunawan, Rahmat
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Pyrolysis study of Ulin (Eusideroxylon zwageri) sawdust in the presence of Ni/SBA-15 using a pyrolysis-gas chromatography-mass spectroscopy (Py-GC/MS) instrument has been carried out. This study aims to determine the chemical composition of pyrolysis products of Ulin sawdust after the addition of Ni/SBA-15 catalyst. Pyrolysis was carried out at 350, 450 and 550 ºC under helium (He) gas. Based on the percent area of the pyrolysis product identified on the pyrogram, the product of lignin derivatives before the addition of the Ni/SBA-15 catalyst was 58.53-68.14% and after the addition of the Ni/SBA-15 catalyst decreased to 51.08-58.33%. While the cellulose/hemicellulose derivative products before the addition of the Ni/SBA-15 catalyst were 15.62-17.78% and after the addition of the Ni/SBA-15 catalyst increased to 18.91-25.79%. Ulin sawdust catalyzed pyrolysis produced compounds with the highest area percent, namely catechol, isoelemicin, 2-Methoxy-4-vinylphenol, 1,6-anhydro-beta-D-Glucopyranose, and hydroxy-acetaldehyde. Keywords: pyrolysis, Eusideroxylon zwageri, Py-GC/MS, Ni/SBA-15 catalyst
A KINETIC STUDY OF MERANTI SAWDUST (SHOREA SPP) PYROLYSIS USING THERMOGRAVIMETRIC ANALYSIS Fitria, Fitria; Subagyono, RR Dirgarini Julia Nurlianti; Gunawan, Rahmat
PROSIDING SEMINAR KIMIA Vol 2 No 1 (2023): Prosiding SNK 2023
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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A kinetic study of pyrolysis of meranti wood using the Kissinger-Akahira-Sunose (KAS), Ozawa-Flynn-Wall (OFW), and Friedman methods using thermogravimetric analysis has been carried out. This study aims to study the synergistic effect of meranti wood and determine the activation energy value. Pyrolysis was carried out at four heating rates, namely 10, 15, 20, and 25°C/minute under N2 gas. The temperature range in the active pyrolysis of meranti wood is 128,42-521°C. The average activation energy values of pyrolysis of meranti wood using the KAS, OFW, and Friedman methods were 170,84 ± 30,07 kJ/mol, 180,36 ± 29,42 kJ/mol, respectively 174, ± 54,77 kJ/mol. Keywords: meranti wood, kinetics studies, pyrolysis, thermogravimetric analysis
STUDI DEKOMPOSISI TERMAL PIROLISIS Spirulina platensis DENGAN LAJU PEMANASAN 15 °C/MENIT Utami, Devira Ulva; Subagyono, RR Dirgarini Julia Nurlianti; Gunawan, Rahmat
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Thermal decomposition study of Spirulina platensis pyrolysis with heating rate of 15°C/min was conducted. Microalgae pyrolysis was carried out with a thermogravimetric analyzer (TGA) instrument. This research focused on analyzing the thermal decomposition process of Spirulina platensis which has a moisture content of 8.34% and ash content of 7.18%. Thermal decomposition of Spirulina platensis occurs in 3 stages, namely water evaporation at temperatures ≤ 140°C; active pyrolysis with a temperature range of ±147-502°C involving thermal decomposition of carbohydrate compounds, proteins and lipids; and passive pyrolysis with temperatures ≥ 502°C, where the remains of more stable organic components were decomposed. Keywords: Spirulina platensis, thermogravimetric analysis, and decomposition
STUDI PIROLISIS MIKROALGA (Spirulina platensis) TERHADAP KONSENTRASI PRODUK TURUNAN KARBOHIDRAT Qosim, Assyfa Machmudah; Subagyono, RR Dirgarini Julia Nurlianti; Gunawan, Rahmat
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Pyrolysis study of microalgae Spirulina platensis using Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC/MS) instrument has been conducted. In the pyrolysis product of microalgae Spirulina platensis, the chemical composition of carbohydrate-derived products was 10.70%. The carbohydrate-derived product compounds produced were 2-methyl-propanal, phenol, and 1-hydroxy-2-propanone. Keywords: Spirulina platensis, pyrolysis, Py/GC-MS
STUDI PIROLISIS MIKROALGA HIJAU (Spirulina platensis) TERHADAP KONSENTRASI PRODUK TURUNAN LIPID Sahirah, Nabilah Sinar; Subagyono, RR Dirgarini Julia Nurlianti; Gunawan, Rahmat
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Pyrolysis study of Spirulina platensis using Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC/MS) instrument has been conducted. In the pyrolysis products identified on the pyrogram, the chemical composition of lipid-derived products was 55.70%. These lipid-derived compounds are hexadecanoic acid (31.05%), oleic acid (6.06%), and octadecanoic acid (3.68%). Keywords: Spirulina platensis, pyrolysis, Py/GC-MS
A MINI REVIEW: STUDI KOMPUTASI TERHADAP STRUKTUR ELEKTROLIT PADA SILICENE, GRAPHENE, DAN GERMANENE Harvina, Harvina; Gunawan, Rahmat; Allo, Veliyana Londong
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Research on two-dimensional (2D) materials such as graphene, silicene, and germanene has garnered significant attention due to their unique electronic and mechanical properties. This mini review employs Density Functional Theory (DFT) to compare the electronic properties of these three materials. The results show that graphene, with sp² hybridization, possesses outstanding electrical conductivity and high mechanical strength, with a lattice constant of 2.46 Å. Silicene and germanene, composed of silicon and germanium atoms respectively, exhibit higher surface reactivity and potential for advanced electronic applications due to their ability to open band gaps through various methods. Silicene has a lattice constant of 3.90 Å and an electronegativity of 1.9, while germanene has a lattice constant of 3.97 Å and an electronegativity of 2.01. The band structures of silicene and graphene do not exhibit band gaps, with dominant states in the p orbital, whereas germanene displays semiconductor behavior with a zero band gap opening at the K-point. Graphene shows high in-plane stiffness, while silicene and germanene have respective stiffness, with graphene and silicene being brittle and germanene being ductile. This study provides insights into the fundamental differences in the electronic properties of graphene, silicene, and germanene, as well as their potential applications in semiconductor technology and high-speed, low-energy electronic devices. Keywords: Silicene, Graphene, Germanene, DFT, Electronic structure
STUDI PIROLISIS MIKROALGA Spirulina platensis TERHADAP KONSENTRASI PRODUK TURUNAN PROTEIN Wahyuni, Ade Putri; Subagyono, RR Dirgarini Julia Nurlianti; Gunawan, Rahmat
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

Pyrolysis study of microalgae Spirulina platensis using Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC/MS) instrument has been conducted. Based on the percent area value of pyrolysis products identified on the pyrogram, the concentration of Spirulina platensis pyrolysis products resulting from thermal decomposition of protein was 6.27%. Keywords: Pyrolysis, Spirulina platensis, Py-GC/MS.
Co-Authors -, Bohari Adha, Dhea Nur Agustin Pratiwi, Agustin Agustinus Pata, Agustinus Aidil Putra, Aidil Aisyah, Ema Agustina Akbar, Muh. Ali Albar Alhabib, Albar Alimuddin - Allo, Veliyana Londong Aman Sentosa Panggabean Amanda, Rika Anta Wiguna, Alvilah Ardiansyah - Arif Maulana Yusuf Arissah, Nur Aristawidyaningrum, Apta Aspin Aspin, Aspin Awalludin, Dudi B.K, Felicia A. Stevanie` Badi'ah, Hanif Bakhri, Asep Samsul Boby Royan alfadlil, Boby Royan Bohari Yusuf Chairul Saleh Cynthia Linaya Radiman Daniel Daniel Darman, Darmansyah DARMANSYAH . Dedy Prasetyo Dewi Sundari, Dewi Eko Haryanto Elanda, Anggi Fadillah, Fahmi Fauziah, Holidah Fitria Fitria Giovanni, Krisno Hajarudin, Iik Hammamiyah, Ulinnuha Hanafie, Daffy Mohamad Ismail Harpinus, Doki Harvina, Harvina Herman, Heri Hermawan K. Dipojono Indaryono Indaryono, Indaryono Iswara, Muhammad Wahyugo Jahada, Jahada Jeki Purnama Putra Jumadhi, Nurkattho Kartika Pratiwi Kurniasih, Ririn Feby Kusumastuti, Meidina Lumaku, Samuel Pangestu Enggal Magdaleni, Agustina Rahayu Malfiany, Rini Malik, Abdilla Manik, Sondang Hukum Parulian Margarita, Margarita Marsella, Yuni Maryadi, Wendri Maygusten, Maygusten Meiniarti, Meiniarti Mokhamad Wahidin Muhamad Abdulkadir Martoprawiro Muhamad Yulianto Mukhamad Nurhadi, Mukhamad Nasri Nasri Nasri, Nasri Nindia, Azrina Noor Hindryawati, Noor Nurul Fatimah Onsardi, Onsardi pakasi, Resy Palentin, Ersa Rizkita Pardian, Riki Ananda Pratiwi Hutabarat, Ilona Puji Astuti Qosim, Assyfa Machmudah Romdona, Muhammad Zulfikar Rostiani, Yeny Sahirah, Nabilah Sinar Saibun Sitorus Said, Yahya Santoso, Muzi Sari, Prinka Susmita Sarwawan, Ade Putri Hawiyah Sihotang, Recha Defrosa Morasih Samta Slamet Supriyadi Solly Aryza Subagyono, R. R Dirgarini J.N. Subagyono, R.R. Dirgarini Subagyono, RR Dirgarini Julia Nurlianti Sudarijati Sudirman, Irpan Sugiarti - Suherman, Yahya Suparya, Eman Suyitno Suyitno Syafriyanti, Yuly Ubaedi, Ubaedi Utami, Devira Ulva Virginia, Bintang Wachdijono, Wachdijono Wahyudi, Habib Putra Wahyuni, Ade Putri Yasifa, Firhan Yudiana, Yudiana Yulianto, R. Mega Yuliyanto, R. Mega Yuliyanto, R.Mega Zain, Fikri Naufal