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All Journal JURNAL KIMIA SAINS DAN APLIKASI PROSIDING SEMINAR KIMIA Jurnal Kimia Mulawarman E-Dimas: Jurnal Pengabdian kepada Masyarakat ALCHEMY Jurnal Penelitian Kimia Akta Kimia Indonesia Chemistry Indonesian Journal of Chemical Research Molluca Journal of Chemistry Education (MJoCE) AKM: Aksi Kepada Masyarakat
Allo, Veliyana Londong
Jurusan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Mulawarman
Religion Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Materials Science & Nanotechnology Social Sciences Other

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Journal : PROSIDING SEMINAR KIMIA

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CO-PIROLISIS MIKROALGA HIJAU (Botryococcus braunii) DAN VICTORIAN BROWN COAL DENGAN VARIASI LAJU PEMANASAN MENGGUNAKAN THERMOGRAVIMETRIC ANALYSER Wardina Masdalifa; RR Dirgarini Julia Nurlianti Subagyono; Veliyana Londong Allo; Rudy Agung Nugroho
PROSIDING SEMINAR KIMIA 2021: SEMINAR NASIONAL KIMIA 2021
Publisher : PROSIDING SEMINAR KIMIA

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Studi reaksi co-pirolisis mikroalga Botryococcus braunii dan Victorian brown coal dengan thermogravimetric analyser telah dilakukan. Penelitian ini dilakukan untuk mempelajari potensi dari campuran Botryococcus braunii dan Victorian brown coal sebagai sumber bahan bakar. Co-pirolisis dilakukan dengan empat variasi laju pemanasan yaitu 10, 15, 20 dan 25 ºC/menit menggunakan Thermogravimetric Analyzer (TGA). Rentang suhu reaksi co-pirolisis aktif Botryococcus braunii dan Victorian brown coal berkisar antara 155,79 ºC hingga 545,27 ºC yang terjadi dalam tiga tahapan. Tahapan pertama adalah penguapan air dan senyawa volatil (20-200 ℃), tahapan kedua yaitu co-pirolisis aktif (250-500 ℃) dan tahapan ketiga yaitu dekomposisi lignin dan senyawa karbon yang terkandung dalam campuran mikroalga dan batubara (500-800 ℃). Kata Kunci: co-pirolisis,TGA, Botryococcus braunii, Victorian brown coal
PIROLISIS MIKROALGA BOTRYOCOCCUS BRAUNII DENGAN VARIASI LAJU PEMANASAN MENGGUNAKAN THERMOGRAVIMETRIC ANALYSER Siti Aminah; RR Dirgarini Julia Nurlianti Subagyono; Veliyana Londong Allo; Rudy Agung Nugroho
PROSIDING SEMINAR KIMIA 2021: SEMINAR NASIONAL KIMIA 2021
Publisher : PROSIDING SEMINAR KIMIA

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Pirolisis mikroalga Botryococcus braunii dengan Thermogravimetric Analyzer (TGA) telah dilakukan. Penelitian ini bertujuan untuk mempelajari karakteristik dan potensi mikroalga B. braunii sebagai sumber energi terbarukan melalui proses pirolisis. Pirolisis dilakukan dengan empat variasi laju pemanasan yaitu 10, 15, 20 dan 25 °C/menit. Berdasarkan hasil karakterisasi, B. braunii memiliki kadar air 5,01 ± 0,42%, kadar abu 27,44 ± 1,11%. Kurva TG dan dTG pirolisis B. Braunii menunjukan rentang suhu untuk reaksi pirolisis aktif mikroalga B. braunii adalah antara 150 – 550 °C, dimana terjadi proses degradasi biomassa yang terdiri dari dekomposisi karbohidrat, protein dan lipid. Kata Kunci: Botryococcus braunii, Pirolisis dan Analisis Termogravimetri
MINI-REVIEW: PEMBUATAN DYE-SENSITIZED SOLAR CELLS (DSSC) MENGGUNAKAN SEMIKONDUKTOR TIO2 DENGAN BANTUAN ZAT PEWARNA ALAMI Muhammad Irvan Mulya Pratama; Veliyana London Allo; Noor Hindryawati
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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The availability of energy sources such as coal and oil is getting thinner every year. Sunlight is one of the most abundant sources of energy on earth. Solar cells can convert this energy into electricity and over time, dye-Sensitized solar cells (DSSC) have the potential to be developed because they have good efficiency. However, the use of synthetic dyes is difficult to obtain and is toxic because it contains heavy metals. Therefore, natural dyes are used as alternative materials in the fabrication of DSSC. The purpose of this article is to review the results of research on DSSC using natural dyes. The method used in this research is the literature review method. The results of the literature review show that the DSSC made with TiO2 semiconductor and natural dyes has a good efficiency of about 0,592 %. Natural dyes can be obtained by extracting plants containing anthocyanins, curcumin and chlorophyll such as red cabbage, turmeric and pandan leaves, what's interesting is that using 2 different types of natural dyes will produce higher efficiency than 1 type of dye. In addition, treatment factors such as dye extraction, the amount of TiO2 used and the length of immersion into the dye also affect the efficiency of the DSSC. Keywords: DSSC, natural dyes and efficiency
SINTESIS DAN KARAKTERISASI MATERIAL SILIKA MESOPORI SBA-15 DENGAN ULTRASONIC ASSISTED SOL-GEL METHOD MENGGUNAKAN PELARUT ASAM ASETAT Siti Sarah; RR Dirgarini Julia Nurlianti Subagyono; Veliyana Londong Allo
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Synthesis and characterization of mesoporous silica material SBA-15 with ultrasonic assisted sol-gel method using acetic acid solvent has been conducted. The mesoporous silica material SBA-15 was characterized by N2 adsorption/desorption Analysis, Small Angle X-Ray Diffraction (SAXRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR). SBA-15 material resulted from the calcination method for template removal has a surface of 876 m2/g, a pore volume of 5,1 cm3/g and a pore diameter of 1,13 nm. The SAXRD pattern of SBA-15 showed three distinctive peaks with Miller indeces of 100, 110 and 200 respectively. The morphology of the SBA-15 material has the form of aggregate particles with a reguler cylindrical structure on the particles. Infrared spectra of SBA-15 showed the presence of functional groups, namely Si-O-Si, Si-OH and –OH. Keywords: Mesoporous silica, SBA-15, sonication
STUDI PIROLISIS AMPAS TEBU DENGAN MENGGUNAKAN INSTRUMEN PYROLYSIS-GAS CHROMATOGRAPHY-MASS SPECTROMETRY (Py-GC/MS) Nana Lestari; RR Dirgarini Julia Nurlianti Subagyono; Veliyana Londong Allo
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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A pyrolysis study of a bagasse using a pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) instrument was carried out. This research was conducted to determine the chemical and physical characteristics of bagasse and to determine the chemical composition of the pyrolysis products of bagasse. Pyrolysis of biomass were carried out at three temperatures, namely 350°C, 450°C and 550°C. Bagasse had a moisture content of 12 ± 0.004%, ash content 2.43 ± 0.001%, cellulose content 58%, lignin content 11 ± 0.02% and 10% hemicellulose content. Based on the percent product area in the pyrogram, bagasse pyrolysis products contained lignin derivative products (16-23%) and cellulose/hemicellulose derivative products 61-66%. Keywords: Pyrolysis, Py-GC/MS, Bagasse
PIROLISIS SABUT KELAPA (Cocos nucifera L) MENGGUNAKAN INSTRUMEN PYROLYSIS-GAS CHOMATOGRAPHY/MASS SPECTROMETRY (PY-GC/MS) Noor Afdaliah; RR Dirgarini Julia Nurlianti Subagyono; Veliyana Londong Allo
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Pyrolysis of a coconut (Cocos nucifera L) husk using a pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS) instrument was carried out. This research was conducted to determine the chemical composition of pyrolysis of a coconut husk at temperaturs of 350, 450 and 550 °C. Pyrolysis of coconut husk produced lignin derivative products by 15-32% and cellulose/hemicellulose derivative products 9-34%. The gas product produced in the co-pyrolysis of a mixture microalgae anda coconut fiber is 41-50%. Pyrolysis product with the highest % area, namely methyl alcohol, 2-butanone, phenol, benzofuran, 2,3-dihydro- dan 2-methoxy-4-vinylphenol Keywords: Co-pyrolysis, Py-GC/MS dan coconut husk
PYROLYSIS OF MERANTI SAWDUST (Shorea spp) WITH Ni/SBA-15 CATALYST USING PYROLYSIS GAS CHROMATOGRAPHY MASS-SPECTROMETRY (Py-GC/MS) Fitriah, Nur Azizah; Subagyono, R. R Dirgarini J.N.; Allo, Veliyana Londong
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 of meranti sawdust (Shorea spp) with Ni/SBA-15 catalyst at 350°C, 450°C and 550°C using the pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC/MS) technique was carried out. This research was conducted to determine the pyrolysis product and the chemical composition of the pyrolysis product of meranti sawdust catalyzed by Ni/SBA-15 (20%wt.%). Based on the area percentage of products identified on the pyrogram, the chemical compositions of the pyrolysis product of meranti wood were 32.4%-43.6% products derived from cellulose/hemicellulose and 32.7%-23.3% products derived from lignin. The addition of Ni/SBA-15 catalyst to the pyrolysis of meranti sawdust increased the formation of cellulose/hemicellulose derivative products such as furan and furfural, as well as lignin derivative products such as vanillin. However, increasing the concentration of the catalyst also improved the amount of acetic acid, which is potentially corrosive and detrimental. Keywords: Pyrolysis, Meranti sawdust, Catalyst Ni/SBA-15, Py-GC/MS
A KINETIC STUDY OF PYROLYSIS OF BAGASSE USING THERMOGRAVIMETRIC ANALYSIS Rachmawanti, Octaviana; Subagyono, R.R. Dirgarini; Allo, Veliyana Londong
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 bagasse using thermogravimetric analysis using the model-free methods, including the Kissinger-Akahira-Sunose (KAS) method and the Friedman method, has been carried out. The purpose of this study was to determine the pyrolysis decomposition process of bagasse and to determine the activation energy value of pyrolysis of bagasse. In this study, pyrolysis was carried out at various heating rates of 10, 15, 20, and 25 °C/minute using a Thermogravimetric Analyzer (TGA). The active pyrolysis temperature range of bagasse was + 104-431°C with a mass reduction of 56-64% where the decomposition process of cellulose, hemicellulose, and lignin in the biomass sample occurred. The activation energy obtained based on the KAS was 136.39 + 23.19 kJ/mol, wheres the activation energy obtained based on the Friedman method was 156.19 + 35.28 kJ/mol. Keywords: Bagasse, Pyrolysis, Thermogravimetry, Model-free, Activation Energy
PYROLYSIS OF BAGGASE WITH Ni/SBA-15 CATALYST USING PYROLYSIS GAS CHROMATOGRAPHY MASS-SPECTROMETER (Py-GC/MS) Praskianto, Ahmed Iqbal; Subagyono, R. R Dirgarini J.N.; Allo, Veliyana Londong
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 experiments of bagasse with catalyst Ni/SBA-15 at 350°C, 450°C and 550°C using a Pyrolysis-Gas Chromatography-Mass Spectrometer (Py-GC/MS) been done. This study aims to determine the chemical composition of the pyrolysis product of bagasse with Ni/SBA catalysis (10% w/w). Based on the percent area value of the pyrolysis product identified on the pyrogram, the chemical composition of the pyrolysis product of bagasse produced was a cellulose/hemicellulose derivative product of 45.46%-60.24% and a lignin derivative product of 32.81%-17.77% . The addition of the catalyst Ni/SBA-15 to the pyrolysis of bagasse increased the amount of cellulose/hemicellulose derivative products such as ketones and furfural and then increased the amount of lignin derivative products such as vanillin and phenol. Keywords: Pyrolysis, Baggase, Catalyst Ni/SBA-15, Py-GC/MS
STUDI PIROLISIS MIKROALGA HIJAU (Spirulina platensis) TERHADAP KONSENTRASI PRODUK TURUNAN KLOROFIL Mardiani, Evi; Subagyono, RR Dirgarini Julia Nurlianti; 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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Pyrolysis study of green microalgae (Spirulina platensis) using Pyrolysis-Gas Chromatography-Mass Spectrometry (Py-GC/MS) instrument has been conducted. In this study, the Spirulina platensis microalgae used had a moisture content of 8.34% and an ash content of 7.18%. Pyrolysis of Spirulina platensis microalgae at 450˚C produced chlorophyll derivative products of 6.20%. Keywords : Spirulina platensis, pyrolysis, Py/GC-MS
Co-Authors Ade Putri Wahyuni Agustina Tri Putri Sitinjak Anisa, Nia Nur Ari Susandy Sanjaya, Ari Susandy D J N Subagyono Digva Willyan Djihan Ryn Pratiwi Evi Mardiani, Evi Fitriah, Nur Azizah Gunawan, Rahmat Halimatus Sa'diyah Harvina, Harvina Husna Syaima Irfan Ashari Hiyahara Irfan Ashari Hiyahara Maahury, Mirella Fonda Manawan, Maykel Maykel Manawan Moh Syaiful Arif Muhammad Abdulkadir Martoprawiro Muhammad Irvan Mulya Pratama Nana Lestari Nanang Tri Widodo Noor Afdaliah Noor Hindryawati Praskianto, Ahmed Iqbal Putri, Dini Hariyanto R R Dirgarini Julia Nurlianti Subagyono Rachmawanti, Octaviana Rahmah, Siti Rahmat Gunawan Rahmat Gunawan RAHMAT GUNAWAN Rahmat GUnawan Rahmat Gunawan RR Dirgarini Julia Nurlianti Subagyono RR Dirgarini Julia Nurlianti Subagyono RR Dirgarini Julia Nurlianti Subagyono Rudy Agung Nugroho Siti Sarah Subagyono, R. R Dirgarini J.N. Subagyono, R.R. Dirgarini Subagyono, R.R. Dirgarini Julia Nurlianti Subagyono, RR Dirgarini Julia Nurlianti Wardina Masdalifa