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All Journal PROSIDING SEMINAR KIMIA Jurnal Kimia Mulawarman E-Dimas: Jurnal Pengabdian kepada Masyarakat Chemistry Indonesian Journal of Chemical Research Molluca Journal of Chemistry Education (MJoCE)
Veliyana Londong Allo
Jurusan Kimia FMIPA Universitas Mulawarman
Biochemistry, Genetics & Molecular Biology Chemistry Education Engineering Environmental Science Social Sciences

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Journal : PROSIDING SEMINAR KIMIA

 1 
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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Abstract

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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Abstract

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
Co-Authors D J N Subagyono Digva Willyan Djihan Ryn Pratiwi Halimatus Sa'diyah Irfan Ashari Hiyahara Maahury, Mirella Fonda Muhammad Abdulkadir Martoprawiro Muhammad Irvan Mulya Pratama Nana Lestari Noor Afdaliah Noor Hindryawati R R Dirgarini Julia Nurlianti Subagyono Rahmat GUnawan Rahmat Gunawan RR Dirgarini Julia Nurlianti Subagyono Rudy Agung Nugroho Siti Sarah Wardina Masdalifa