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All Journal JURNAL KIMIA SAINS DAN APLIKASI PROSIDING SEMINAR KIMIA JURNAL ATOMIK AKM: Aksi Kepada Masyarakat
Subagyono, RR Dirgarini Julia Nurlianti
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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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Abstract

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
Pelatihan Ecoprint Bagi Mahasiswa Summer School 2024 Di Universitas Mulawarman, Kalimantan Timur Al Ghazali, Muhammad Fathan; Fadhlurrohman, Muhammad Rafi Yahya; Zahra, Nadya Nur Yulia; Subagyono, RR Dirgarini Julia Nurlianti
AKM Vol 5 No 2 (2025): AKM : Aksi Kepada Masyarakat Jurnal Pengabdian Kepada Masyarakat - Januari 2025
Publisher : Sekolah Tinggi Ekonomi dan Bisnis Syariah (STEBIS) Indo Global Mandiri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36908/akm.v5i2.1242

Abstract

Pelatihan ecoprint merupakan salah satu cara untuk mengembangkan kreativitas generasi muda, tidak hanya dalam hal peningkatan keterampilan dan kreativitas, tetapi juga dalam hal peningkatan kesadaran lingkungan. Ecoprint merupakan salah satu teknik mewarnai kain dengan cara mencetak menggunakan bahan-bahan alami seperti daun, bunga, dan kulit kayu yang memiliki kandungan pewarna alami. Pelatihan ecoprint memungkinkan para peserta untuk belajar tentang pemanfaatan sumber daya alam sekitar, sehingga mengurangi ketergantungan pada bahan kimia yang biasa digunakan di industri tekstil. Pelatihan ecoprint diselenggarakan oleh UPT. Layanan Internasional, Universitas Mulawarman dengan melibatkan peserta Summer School 2024 Universitas Mulawarman yang berasal dari berbagai negara. Kegiatan pengabdian masyarakat ini dilakukan dengan metode pengenalan teknik ecoprint, pelatihan dan pendampingan peserta dalam melakukan teknik pounding. Berdasarkan hasil kuesioner yang diberikan, secara general, pelatihan ecoprint ini dapat meningkatkan kemampuan para peserta dalam mempraktikan teknik pounding, berdasarkan penyampaian materi dari instruktur, sesi tanya jawab pada saat pelatihan, dan pendampingan dari instruktur dan mahasiswa.
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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Abstract

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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Abstract

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 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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Abstract

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
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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Abstract

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
ANALISIS TERMOGRAVIMETRI MIKROALGA SPIRULINA PLATENSIS DENGAN LAJU PEMANASAN 10ºC/MENIT Claudia B. P, Chintya Zalza Laola; Subagyono, RR Dirgarini Julia Nurlianti; Kassim, Mohd Asyraf
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

The pyrolysis of Spirulina platensis microalgae using thermogravimetric analysis at a heating rate of 10°C/min has been conducted. This study aims to examine the characteristics of Spirulina platensis microalgae through its thermal decomposition behavior and the active and passive pyrolysis temperature ranges in the microalgae powder. Based on the analysis results, Spirulina platensis microalgae contains 8.34% moisture and 7.18% ash content. The decomposition pattern of Spirulina platensis microalgae is divided into three stages: the water evaporation stage occurs at temperatures ≤ 150ºC, the active/main pyrolysis stage occurs in the temperature range of 150-502°C, and the passive pyrolysis stage occurs at temperatures ≥ 502°C. Keywords: Spirulina platensis, Pyrolysis, and Thermogravimetric Analysis.
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.
DECREASE THE LEVEL OF LINEAR ALKYLBENZENE SULFONATE (LAS) WITH USING RICE HUSK ASH Hidayah, Amala Nur; -, Alimuddin; Subagyono, RR Dirgarini Julia Nurlianti
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Penelitian tentang penurunan kadar linear alkylbenzene sulfonate (LAS) dalam limbah laundry menggunakan abu sekam padi telah dilakukan. Tujuan dari penelitian ini untuk mengetahui kinerja adsorpsi dari abu sekam padi dengan optimasi pH, berat, waktu kontak, konsentrasi dan kapasitas pada proses adsorpsi. Rendemen abu sekam padi yang diperoleh sebesar 28,58 %. Kondisi optimum penjerapan pada 2 mg/L linear alkylbenzene sulfonate (LAS) sebanyak 150 mL menggunakan 0,4 g abu sekam padi yaitu pada pH 5 dalam waktu 30 menit dengan kapasitas adsorpsi maksimum 3,894 mg/g. Hasil penurunan kadar LAS pada limbah laundry dari 1,8661 mg/L menjadi 0,465 mg/L ppm yaitu sebesar 75,013 %.
SINTESIS SILIKA MESOPORI TERSULFONASI DARI ABU DAUN BAMBU PETUNG (Dendrocalamus asper) Precelia, Sari Clara; Subagyono, RR Dirgarini Julia Nurlianti; Saleh, Chairul
JURNAL ATOMIK Vol 3 No 1 (2018)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Research on the synthesis of sulfonated mesoporous Silica from bamboo leaves ash (Dendrocalamus asper) as Heterogeneous Acid Catalyst has been conducted. Bamboo Leaf Ashfish serves as a source of silica for the manufacture of Mesoporous Silica. The research phase consisted of synthesis of MSU-H with surfactant template method, mesoporous silica modification with 3-mercaptopropyl-trimethoxysilane (MPTMS) using post grafting method. The mesoporous silica has a pore volume of 1.03 cm3/g, a surface area of 150 m2/g and a pore diameter of 27.5 nm. The FT-IR spectrum of mesoporous silica before sulfonation shows the presence of Si-O-Si, and Si-OH functional groups while that of Mesoporous silica after sulfonation shows the presence of Si-O-Si, Si-O, Si-OH and –SO3H functional groups.
Co-Authors Al Ghazali, Muhammad Fathan Alimuddin - Allo, Veliyana Londong Chairul Saleh Claudia B. P, Chintya Zalza Laola Evi Mardiani, Evi Fadhlurrohman, Muhammad Rafi Yahya Fitria Fitria Hidayah, Amala Nur Kassim, Mohd Asyraf Manawan, Maykel Noor Hindryawati, Noor Precelia, Sari Clara Putri, Dini Hariyanto Qosim, Assyfa Machmudah RAHMAT GUNAWAN Sahirah, Nabilah Sinar Utami, Devira Ulva Wahyuni, Ade Putri Wulandari, Duwi Devi Zahra, Nadya Nur Yulia