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All Journal Jurnal Kimia Mulawarman E-Dimas: Jurnal Pengabdian kepada Masyarakat JURNAL ATOMIK Chemistry Indonesian Journal of Chemical Research
R R Dirgarini Julia Nurlianti Subagyono
Jurusan Kimia FMIPA Universitas Mulawarman
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Social Sciences

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PEMANFAATAN ABU DAUN JAGUNG (Zea Mays) SEBAGAI SUMBER SILIKA PADA PEMBUATAN KATALIS Na/ SBA- 15 UNTUK REAKSI TRANSESTERIFIKASI MINYAK JELANTAH Drajat Bangun Utomo; R R Dirgarini Julia Nurlianti Subagyono; Rahmat GUnawan
JURNAL KIMIA MULAWARMAN Vol 16 No 1 (2018)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v16i1.621

Abstract

Preparation of Na / SBA-15 from corn leaves ash (Zea mays) as a substitute for TEOS (Tetraethyl Orthosilicate) applied as a heterogeneous catalyst in the transesterification reaction of used palm oil and methanol has been performed. The preparation of SBA-15 was conducted by surfactant template method and modification with Na was conducted by impregnation method. SBA-15 from corn leaves ash has a pore size ranging from 4.9 nm to 9.3 nm, a surface area of ​​595 m2/ g, a pore diameter of 3.95 nm and a pore volume of 0.99 cm3/ g. The yeild obtained from the first transesterification process was 96.46% with the free fatty acid content of the product 0.16 mg KOH/ g. The two most prominent methyl ester based on the chromatogram of the transesterification product, the two most prominent methyl ester in the product were methyl palmitate (36,32%) and methyl oleat (36,15%). Keywords : Maize, SBA-15, TEOS (Tetraethyl Orthosilicate), Transesterification of used palm oil
UJI ANTIBAKTERI Ag/SBA-15 DARI ABU DAUN BAMBU PETUNG TERHADAP BAKTERI Escherichia coli Nurdahniyati Nurdahniyati; Nunung Handayani; Dirgarini Julia Nurlianti Subagyono; Eko Kusumawati
JURNAL KIMIA MULAWARMAN Vol 17 No 2 (2020)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Antibacterial tests of Ag/SBA-15 from petung bamboo leaf ash against Escherichia coli were carried out. Modification of SBA-15 with Ag was conducted using the wet impregnation method while the antibacterial test was carried out by well diffusion method and disc diffusion method with various concentrations of Ag/SBA-15. The Ag/SBA-15 has a surface area of ​​143 m2/g, pore diameter of 8.4 nm and pore volume of 0.35 cm3/g. The SAXS pattern of Ag /SBA-15 showed 3 typical SBA-15 peaks in the 0o -2o 2θ range with the miller index [100], [110] and [200], indicating modification with Ag did not change the hexagonal structure of SBA-15. Ag / SBA-15 material has the potential as an antibacterial agent for Escherichia coli; the inhibitory zone diameters for the well diffusion method and disc diffusion method were 7.00 ± 0.57 mm and 13.16 ± 0.16 mm, respectively. Increasing the concentration of Ag/SBA-15 samples resulted in greater inhibitory zone diameters for the bacteria.
UJI ANTIBAKTERI Ag/SBA-15 DARI ABU DAUN BAMBU PETUNG TERHADAP BAKTERI Escherichia coli Nurdahniyati Nurdahniyati; Nunung Handayani; RR Dirgarini Julia Nurlianti Subagyono; Eko Kusumawati
JURNAL KIMIA MULAWARMAN Vol 18 No 2 (2021)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v18i2.705

Abstract

Antibacterial tests of Ag/SBA-15 from petung bamboo leaf ash against Escherichia coli were carried out. Modification of SBA-15 with Ag was conducted using the wet impregnation method while the antibacterial test was carried out by well diffusion method and disc diffusion method with various concentrations of Ag/SBA-15. The Ag/SBA-15 has a surface area of ​​143 m2/g, pore diameter of 8.4 nm and pore volume of 0.35 cm3/g. The SAXS pattern of Ag /SBA-15 showed 3 typical SBA-15 peaks in the 0o -2o 2θ range with the miller index [100], [110] and [200], indicating modification with Ag did not change the hexagonal structure of SBA-15. Ag / SBA-15 material has the potential as an antibacterial agent for Escherichia coli; the inhibitory zone diameters for the well diffusion method and disc diffusion method were 7.00 ± 0.57 mm and 13.16 ± 0.16 mm, respectively. Increasing the concentration of Ag/SBA-15 samples resulted in greater inhibitory zone diameters for the bacteria.
UJI ANTIBAKTERI Ag/SBA-15 DARI ABU DAUN BAMBU PETUNG TERHADAP BAKTERI Escherichia coli Nurdahniyati Nurdahniyati; Nunung Handayani; Dirgarini Julia Nurlianti Subagyono; Eko Kusumawati
JURNAL KIMIA MULAWARMAN Vol 16 No 2 (2019)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v16i2.876

Abstract

Antibacterial tests of Ag/SBA-15 from petung bamboo leaf ash against Escherichia coli were carried out. Modification of SBA-15 with Ag was conducted using the wet impregnation method while the antibacterial test was carried out by well diffusion method and disc diffusion method with various concentrations of Ag/SBA-15. The Ag/SBA-15 has a surface area of ​​143 m2/g, pore diameter of 8.4 nm and pore volume of 0.35 cm3/g. The SAXS pattern of Ag /SBA-15 showed 3 typical SBA-15 peaks in the 0o -2o 2θ range with the miller index [100], [110] and [200], indicating modification with Ag did not change the hexagonal structure of SBA-15. Ag / SBA-15 material has the potential as an antibacterial agent for Escherichia coli; the inhibitory zone diameters for the well diffusion method and disc diffusion method were 7.00 ± 0.57 mm and 13.16 ± 0.16 mm, respectively. Increasing the concentration of Ag/SBA-15 samples resulted in greater inhibitory zone diameters for the bacteria.
Sintesis Silika Mesopori Sba-15 Dari Abu Daun Jagung (Zea Mays L) Nasri Nasri; R R Dirgarini J. N Subagyono; Rahmat Gunawan
JURNAL KIMIA MULAWARMAN Vol 15 No 1 (2017)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/jkm.v15i1.524

Abstract

The synthesis and characterization of mesoporous silica Santa Barbara Acid-15 (SBA-15) from the ash of corn have been done. SBA-15 was synthesised using the surfactant template method. SBA-15 from corn leaves ash has a surface area of 592 m2 / gram, pore volume of 0.99 cm3 / gram and pore diameter of 3.95 nm with pore size ranging from 4.9 nm - 7.1 nm. The SAXS pattern of the bio-SBA-15 showed three typical peaks of SBA-15 with miller indices [100], [110] and [200]. In the FTIR spectrum of SBA-15, peaks from Si-O-Si, Si-OH and H-O-H from water were observed.
Pelatihan Penggunaan Chemistry Board Games dalam Pembelajaran Kimia bagi Guru-Guru SMA di Kota Samarinda RR Dirgarini Julia Nurlianti Subagyono; Irfan Ashari Hiyahara; Veliyana Londong Allo; Rahmat Gunawan
E-Dimas: Jurnal Pengabdian kepada Masyarakat Vol 12, No 3 (2021): E-DIMAS
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/e-dimas.v12i3.5051

Abstract

Mata pelajaran kimia merupakan mata pelajaran di tingkat sekolah menengah atas yang sering dianggap sulit dipahami oleh siswa. Tantangan yang sering dihadapi oleh sebagian guru kimia di tingkat Sekolah Menengah Atas (SMA) di kota Samarinda adalah meningkatkan minat dan motivasi siswa untuk belajar kimia dan memahami konsep-konsep dalam kimia yang sebagian bersifat abstrak. Pemakaian media pembelajaran dalam pengajaran kimia menjadi salah satu solusi untuk membantu guru meningkatkan sifat positif siswa terhadap mata pelajaran. Untuk itu diperlukan pelatihan penggunaan media pembelajaran kimia interaktif agar suasana belajar yang menyenangkan dapat tercipta. Tujuan kegiatan pengabdian masyarakat ini adalah meningkatkan pemahaman guru kimia di kota Samarinda akan pentingnya penggunaan media pembelajaran. Selain itu kegiatan ini bertujuan untuk memberikan pelatihan penggunaan media pembelajaran kimia berupa chemistry board games. Tiga media pembelajaran yang digunakan adalah chemipoly (monopoli kimia), ular tangga kimia dan kartu unsur. Metode yang digunakan dalam pengabdian ini berupa training/pelatihan kepada guru-guru SMA tentang penggunaan chemistry board games dalam pengajaran kimia kepada siswa. Hasil yang diperoleh pada pelatihan ini adalah meningkatnya pemahaman guru kimia akan pentingnya media pembelajaran dalam kelas dan meningkatnya pemahaman dan kemampuan guru dalam menggunakan tiga media pembelajaran dalam pengajaran kimia, khususnya pada materi tabel periodik unsur dan sifat fisik dan kimia unsur-unsur kimia. Penggunaan media pembelajaran kimia mampu meningkatkan minat dan motivasi siswa SMA di kota Samarinda yang mengikuti pelatihan ini.
Validasi Metode Penentuan Mn Dalam Oli Lubrikan Dengan Metode Pengenceran Langsung Menggunakan Spektrofotometer Serapan Atom Rona Maningting Napitupulu; Dirgarini Julia; Aman S. Panggabean
Indonesian Journal of Chemical Research Vol 6 No 2 (2019): Edisi Bulan Januari (Edition For January)
Publisher : Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598//ijcr.2019.6-ama

Abstract

Validation method on the determination of Mn in lubricating oil by direct dilution method using Atomic Absorption Spectrophotometer (AAS) in Laboratory & Environment Control PT. Badak NGL Bontang has been done The validation method was done with research stages such as determination of optimum solvent, and determination of some important parameters influential for validation method such as parameter of liniearitas (r), Instrument Detection Limit (IDL), Methode Detection Limit (MDL), accuracy, precision, Limit of Detection(LOD) and Limit of Quantitation(LOQ). The result of research obtain is good, showed that the linearity value with R2 ≥ 0,997. The IDL and MDL value was 0.0021 ppm and 0.0092 ppm respectively and has been acceptability requirements of MDL. The accuracy paramater obtained recovery value with range 82.25-88.34%. The measurement of repeatability and reproducibility, the CV Horwitz value smaller than % RSD, indicating the method had a good precision. The measurement of LOD and LOQ value was 0.095 ppm 0.317 ppm respectively. Based on the result of the research determination method of Mn in lubricating oil by direct dilution method using AAS concluded valid.
STUDI VARIASI BERAT KATALIS WO3-SBE DALAM PROSES SONOKATALITIK METHYLENE BLUE Wilsoma Wilsoma; Noor Hindryawati; R.R. Dirgarini Julia Nurlianti Subagyono
JURNAL ATOMIK Vol 4 No 2 (2019)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (407.365 KB)

Abstract

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%.
Co-Authors Aman S. Panggabean Drajat Bangun Utomo Eko Kusumawati Irfan Ashari Hiyahara Nasri Nasri Noor Hindryawati, Noor Nunung Handayani Nunung Handayani Nurdahniyati Nurdahniyati Nurdahniyati Nurdahniyati Rahmat Gunawan Rahmat Gunawan Rahmat GUnawan Rona Maningting Napitupulu Veliyana Londong Allo Wilsoma Wilsoma