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

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ANALISIS TERMOGRAVIMETRI Spirulina platensis DENGAN KATALIS Ni/Al-SBA-15 RASIO Si/Al=10 MENGGUNAKAN LAJU PEMANASAN 10°C/MENIT Anisa, Nia Nur; Subagyono, R.R. 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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The thermogravimetric analysis of Spirulina platensis with Ni/Al-SBA-15 catalyst (Si/Al ratio = 10) using a heating rate of 10°C/min has been conducted. This study was performed to determine and analyze the chemical decomposition process of Spirulina platensis with a pyrolysis heating rate of 10°C/min. Based on the characterization results, Spirulina platensis has a moisture content of 8.34% and an ash content of 7.18%. The TG and DTG curves show the active pyrolysis temperature range of Spirulina platensis microalgae with Ni/Al-SBA-15 catalyst between approximately 155-496°C. The chemical decomposition of Spirulina platensis with Ni/Al-SBA-15 catalyst occurs in three stages: 1. water evaporation, 2. active pyrolysis, where the decomposition of carbohydrate, protein, and lipid compounds takes place, and 3. passive pyrolysis caused by gasification and the formation of non-volatile carbon compounds that vaporize to form CO and CO2 gases at high temperatures. Keywords: Thermogravimetry, Spirulina platensis, Pyrolysis, Ni/Al-SBA-15
Sintesis Silika Dari Abu Sekam Padi Termodifikasi 2-Merkaptobenzotiazol untuk Adsorpsi Ion Logam Cd2+ dan Cr6+ Syukri, Irma; Hindryawati, Noor; Subagyono, R.R. Dirgarini Julia Nurlianti
JURNAL ATOMIK Vol 2 No 2 (2017)
Publisher : Jurusan Kimia FMIPA UNMUL

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A study on the adsorption of Cd2+ ion using silica gel modified with 2-mercaptobenzothiazole (MBT) from rice husk ash has been conducted. The modification of silica gel with MBT was conducted by several steps namely, sample preparation, synthesis of sodium silicate and modification of silica using MBT through a sol gel method. The XRF result showed that silica gel contained 98.98 % SiO2 . The FTIR spectrum of silika MBT showed the persence of Si-OH, Si-O, Si-O-Si and –SH groups. The surface area of silica gel and silica MBT were 163 m2/g and 30 m2/g, respectively. The adsorption capacity of Cd2+ ion was 0.42 mg/g and the adsorption percentage was 69.40%. The presence of Cr6+ ion decreased the adsorption capacity of silica MBT over Cd2+ ion.
STUDI VARIASI BERAT KATALIS WO3-SBE DALAM PROSES SONOKATALITIK METHYLENE BLUE Wilsoma, Wilsoma; Hindryawati, Noor; Subagyono, R.R. Dirgarini Julia Nurlianti
JURNAL ATOMIK Vol 4 No 2 (2019)
Publisher : Jurusan Kimia FMIPA UNMUL

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Degradations of methylene blue by sonocatalytic method using Spent Bleaching Earth (SBE) impregnatedwith WO3 have carried out. The stages of this study included SBE preparation, activation with H2SO4, modificationof WO3 with SBE through wet impregnation processes and sonocatalytic testing. WO3-SBE was characterizedusing XRD. XRD diffraction patterns of WO3-SBE showed the appeareance of WO3 peak at 28.855°; 34.813° 2θ.The degradation percentage of methylene blue (catalyst weight of 0.15 gram, methylene blue concentration 100ppm and contact time 15 minutes) was 99.12%.
SYNTHESIS OF SULPHONATED MESOPOROUS SILICA FROM RICE HUSK ASH (Oryza sativa L.) Maylina, Ajeng Chandra; Subagyono, R.R. Dirgarini Julia Nurlianti; Daniel, Daniel
JURNAL ATOMIK Vol 3 No 2 (2018)
Publisher : Jurusan Kimia FMIPA UNMUL

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A study on the synthesis of sulphonated mesoporous silica from rice husk ash (Oryza sativa L.) been conducted. The preparation of sulphonated MSU-H was conducted by several steps namely, extraction of silica from rice husk ash, synthesis of mesoporous silica, synthesis of sulphonated mesoporous silica with post-grafting method. The N2 adsorption-desorption characterization results show the surface area of mesoporous silica 134 m2/g, pore volume 0.81 cm3/g and pore size 24.13 nm. The FT-IR characterization results of sulphonated mesoporous silica indicate the presence of Si-O-Si, Si-O, O-H and C-H alkane clusters.
Co-Authors Allo, Veliyana Londong Anisa, Nia Nur Daniel Daniel Maylina, Ajeng Chandra Noor Hindryawati, Noor Syukri, Irma Wilsoma, Wilsoma