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All Journal PROSIDING SEMINAR KIMIA JURNAL ATOMIK
R.R Dirgarini Julia Nurlianti Subagyono
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science

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MODIFICATION OF ACTIVATED CARBON FROM SHELLS OF JENGKOL WITH TiO2 FOR PHOTODEGRADATION OF RHODAMINE B Widya Rachmah Sari; Noor Hindryawati; R.R Dirgarini Julia Nurlianti Subagyono
JURNAL ATOMIK Vol 4 No 2 (2019)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Modifying activated carbon from jengkol shells with TiO2 to degrade Rhodamine by UV irradiation has been done. Modification of KA-TiO2 photocatalyst using the impregnation method. The photodegradation test of dyes was carried out with several parameters such as the variation of KA-TiO2 catalyst weight and contact time. Photocatalyst characterization using X-ray diffraction (XRD), while for dye concentration using UV-Vis spectrophotometry. Difractogram XRD shows that the activated carbon material after modification with TiO2 metal is characterized by the emergence of typical TiO2 peaks. The results showed that the highest percentage of Rhodamine B degraded by KA-TiO2 was 94.11% with a contact time of 120 minutes and a catalyst weight of 1.5 grams.
STUDI PIROLISIS OFF-GRADE RUBBER DENGAN KATALIS Ni/Ga-SBA-15 MENGGUNAKAN ANALISIS TERMOGRAVIMETRI PADA LAJU PEMANASAN 10°C/MENIT Anisa Anggraeni; R.R Dirgarini Julia Nurlianti Subagyono; Mohd. Asyraf Kassim
PROSIDING SEMINAR KIMIA Vol 4 No 1 (2025): Prosiding SNK 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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A study of off-grade rubber pyrolysis with Ni/Ga-SBA-15 catalyst using thermogravimetric analysis has been conducted. This study aims to determine the thermal decomposition process of off-grade rubber pyrolysis with Ni/Ga-SBA-15 catalyst using thermogravimetric analysis at a heating rate of 10°C/min. The pyrolysis decomposition temperature of off-grade rubber was divided into three stages, namely water evaporation at a temperature of ≤147°C, active pyrolysis at a temperature of ±147-454°C, and passive pyrolysis at a temperature of ≥454°C. Keywords: Thermogravimetric analysis, Ni/Ga-SBA-15 catalyst, Off-grade rubber
PIROLISIS LAMBAT SPIRULINA PLATENSIS PADA SUHU 400˚C Nela Gamboa Rodriques; R.R Dirgarini Julia Nurlianti Subagyono; Abdul Aziz
PROSIDING SEMINAR KIMIA Vol 4 No 1 (2025): Prosiding SNK 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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This study aims to investigate the slow pyrolysis of Spirulina platensis using a laboratory-scale reactor. The slow pyrolysis was conducted at 400°C for 60 minutes. The results showed that the bio-oil yield obtained was 9%. Gas Chromatography-Mass Spectrometry (GC-MS) analysis revealed that the dominant compounds in the bio-oil were hexadecanoic acid, N-Tetradecanoic Acid Amide, 1H-Indole and Phenol,4-Methyl, which are degradation products of lipids and proteins. Keywords: Spirulina platensis, slow pyrolysis, bio-oil, temperature, chemical composition
Co-Authors Abdul Aziz Anisa Anggraeni Mohd. Asyraf Kassim Nela Gamboa Rodriques Noor Hindryawati Widya Rachmah Sari