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RAHMAT GUNAWAN
Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman
Religion Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Neuroscience Public Health Social Sciences Other

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A MINI REVIEW: STUDI KOMPUTASI TERHADAP STRUKTUR ELEKTROLIT PADA SILICENE, GRAPHENE, DAN GERMANENE Harvina, Harvina; Gunawan, Rahmat; 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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Research on two-dimensional (2D) materials such as graphene, silicene, and germanene has garnered significant attention due to their unique electronic and mechanical properties. This mini review employs Density Functional Theory (DFT) to compare the electronic properties of these three materials. The results show that graphene, with sp² hybridization, possesses outstanding electrical conductivity and high mechanical strength, with a lattice constant of 2.46 Å. Silicene and germanene, composed of silicon and germanium atoms respectively, exhibit higher surface reactivity and potential for advanced electronic applications due to their ability to open band gaps through various methods. Silicene has a lattice constant of 3.90 Å and an electronegativity of 1.9, while germanene has a lattice constant of 3.97 Å and an electronegativity of 2.01. The band structures of silicene and graphene do not exhibit band gaps, with dominant states in the p orbital, whereas germanene displays semiconductor behavior with a zero band gap opening at the K-point. Graphene shows high in-plane stiffness, while silicene and germanene have respective stiffness, with graphene and silicene being brittle and germanene being ductile. This study provides insights into the fundamental differences in the electronic properties of graphene, silicene, and germanene, as well as their potential applications in semiconductor technology and high-speed, low-energy electronic devices. Keywords: Silicene, Graphene, Germanene, DFT, Electronic structure
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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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.
DETERMINATION OF PARAMETER QUALITY OF GROUND WELL WATER USING ADSORBENT FILTER FROM RICE HUSK ASH Said, Yahya; -, Alimuddin; Gunawan, Rahmat
JURNAL ATOMIK Vol 6 No 1 (2021)
Publisher : Jurusan Kimia FMIPA UNMUL

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Determining the parameters of the quality of well water in Mugirejo, Sungai Pinang, Samarinda, using an adsorption filter from rice husk ash, has been carried out. Determination of the optimum flow rate and the level of each water quality parameter BOD, TSS and levels of metals (Pb, Fe, Mn). Based on the results of the filtration process in well water samples showed that the effect of the flow rate obtained the optimum flow rate of 1 hour per liter against decreasing levels of BOD, TSS and levels of metals (Pb, Fe and Mn) of 8.1, 17.28 mg/L O2, 1.4 mg/L, 68 mg/L, ND (No Detection), 0.0012 µg/mL and 0 µg/mL. For the flow rate of ½ hour per liter against decreases in BOD, TSS and levels of metals (Pb, Fe and Mn) respectively at 8.0, 30.52 mg/L O2, 2.01 mg/L, 46 mg/L, 0 µg/mL, 0.0109 µg/mL and 0.021 µg/mL.
ADSORPTION OF FE METAL ION IN SOLUTION USING NATURAL ZEOLITE ACTIVATED BY KOH Palentin, Ersa Rizkita; Hindryawati, Noor; Gunawan, Rahmat
JURNAL ATOMIK Vol 4 No 2 (2019)
Publisher : Jurusan Kimia FMIPA UNMUL

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Adsorbtion of Fe metal ion in solution using natural zeolite activated by KOH has been conducted. Natural zeolite was characterized using X-Ray Flourescence (XRF), X-Ray Diffraction (XRD) and surface area test. The XRF analysis results showed a decreasing SiO2 composition in natural zeolite activated by KOH 1.5 M. XRD analysis results showed the type of natural zeolite activated by KOH was mordenite with the chemical compound Ca2.5Na2Al7Si41O96.24H2O. The surface area of natural zeolite was 75.041 m2/g and after activation with KOH 1.5 M was 126.908 m2/g. The optimum conditions for the adsorption of Fe ions was at pH 4 with % adsorption was 96.24% at a 90 minutes the % adsorption was 98.3%.
PEMBUATAN MEMBRAN SILIKA DARI FLY ASH BATUBARA UNTUK PENURUNAN INTENSITAS WARNA DARI LIMBAH CAIR INDUSTRI SARUNG SAMARINDA Pratiwi, Kartika; -, Bohari; Gunawan, Rahmat
JURNAL ATOMIK Vol 3 No 1 (2018)
Publisher : Jurusan Kimia FMIPA UNMUL

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Synthesis of silica membrane from coal fly ash to decrease the color intensity of the liquid waste of sarung Samarinda industry has been done. The extraction of silica from coal fly ash by using the sol-gel process, and for silica membrane by using mixture of PVA (Poly Viny Acohol) and PEG (Polyethylen Glycol. Decrease in color intensity were analyzed using UV-Visible Spectrofotometer and the morphology of the membrane was observed by SEM-EDX. Based on the results from the spectrofotometer the concentration of the liquid waste berofe is 52.92 Unit Pt.Co and after decolorization is 25.04 Unit Pt.Co. The result show that decreasing are concentration is 52.68%, and the results the Scanning Electron Microscope (SEM)-EDX on the membrane after decolorization of liquid waste show distribution of pores in the membrane experiencing changes caused by new particles covering membrane be expected from liquid waste, and the elements are C, O, Na, Al and Si.
ANALISIS KADAR ION TIMBAL (Pb) DAN ION KROMIUM (Cr) PADA RAMBUT PEKERJA PERBENGKELAN DI KOTA SAMARINDA -, Sugiarti; Gunawan, Rahmat; -, Alimuddin
JURNAL ATOMIK Vol 1 No 2 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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Telah dilakukan penelitian ini yang bertujuan untuk mengetahui kadar ion timbal dan ion kromium pada rambut pekerja perbengkelan dengan variasi umur dan lama bekerja dengan kadar ion timbal dan ion kromium pada rambut pekerja perbengkelan. Rambut yang sudah dikumpulkan dicuci kemudian diabukan dan dihomogenkan kemudian dianalisis dengan Atomic Absorption Spectrophotometer (AAS). Panjang gelombang untuk analisis logam timbal 283,3 nm dan untuk logam kromium 357,9 nm. Hasil menunjukkan analisis kadar ion timbal sampel pada rambut pekerja bengkel terendah 3,892 (mg/kg) yang tertinggi 48,814 (mg/kg) dan untuk kadar ion kromium sampel rambut pada pekerja bengkel terendah 1,578 (mg/kg) yang tertinggi 36,884 (mg/kg). Berdasarkan uji statistik analisis korelasi yang berhubungan positif umur dan lama bekerja dengan kadar ion timbal dan ion kromium pada rambut pekerja perbengkelan. Dengan Koefisien determinan besarnya kadar ion timbal berdasarkan hubungan lama bekerja 98,2 % dan   untuk ion kromium 97,7 %,  dan koefisien determinan berdasarkan hubungan umur dengan kadar ion timbal 78,2 % dan ion kromium 83,2 %.
UTILIZATION OF ETHANOL FRACTION OF JARUM TUJUH BILAH LEAVES (Pereskia bleo (Kunth) D.C) AS XANTHINE OXIDASE INHIBITOR IN THE FORMATION OF URID ACID Sarwawan, Ade Putri Hawiyah; Sitorus, Saibun; Gunawan, Rahmat
JURNAL ATOMIK Vol 4 No 1 (2019)
Publisher : Jurusan Kimia FMIPA UNMUL

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This research was conducted to determine the content of secondary metabolite contained in the extract and ethanol fraction of “Jarum tujuh bilah” leaves (Pereskia bleo (Kunth) DC) and and inhibition of xanthine oxidase activity obtained from the isolation of cow's milk. The xanthine oxidase activity is measured at a wavelength of 290 nm. The results of this research indicate that in the ethanol extract and fraction of “jarum tujuh bilah” leaves have the secondary flavonoids, alkaloids and phenolic compounds. The highest inhibition of xanthine oxidase activity in the ethanol extract of “jarum tujuh bilah” leaves was 91.67%, while the inhibition of allopurinol was 50% and the ethanol fraction of “jarum tujuh bilah” leaves was seven blades by 90%.
PENURUNAN INTENSITAS WARNA REMAZOL RED RB 133 DALAM LIMBAH BATIK DENGAN ELEKTROKOAGULASI MENGGUNAKAN NaCl Fatimah, Nurul; -, Alimuddin; Gunawan, Rahmat
JURNAL ATOMIK Vol 3 No 1 (2018)
Publisher : Jurusan Kimia FMIPA UNMUL

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A decrease in the intensity of dye Remazol Red RB 133 in batik waste with electrocoagulation method using electrodes aluminum and stainless steel has been done. Analysis was performed using a spectrophotometer Visibel. The results showed that the optimum effect of adding NaCl at a concentration 7 g/L with degradation was 84.95% percent, optimum contact time 60 minutes with degradation was 86.36%, stronger optimum voltage 12 Volts with degradation was 94.31% and pH optimum at pH 4 with degradation was 96.86%. Electrocoagulation in optimum condition dye Remazol Red RB 133 produces an average degradation was 96.41%, and electrocoagulation of batik waste obtained an average degradation was 91.38%.
PEMBUATAN PLASTIK POLIHIDROKSI YANG DAPAT TERDEGRADASI DARI SINGKONG GAJAH (Manihot esculenta) DENGAN PENAMBAHAN GLISEROL SEBAGAI PLASTICIZER Syafriyanti, Yuly; Gunawan, Rahmat; Saleh, Chairul
JURNAL ATOMIK Vol 1 No 2 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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The synthesis of plastic production which can be degreded use manihot esculenta extract already researched. The method of this research using blending according to physics with the addition of glycerol as a plasticizer and FT-IR characterization. The result show that the glycerol concentrate that produce plastics which is easy to degreded well, exist in 45% concentrate whit a value of 25% water resistance and degradability value of 19,7 mg/day. The date of FT-IR give information that there are group alteration or between before and after glycerol increasing in long wave intensity
VALIDASI METODE “RAPID TEST” TERHADAP PENENTUAN PARAMETER TOTAL MOISTURE (AR), ASH CONTENT (AR) DAN CALORIFIC VALUE DI PT. KALTIM PRIMA COAL pakasi, Resy; Panggabean, Aman Sentosa; Gunawan, Rahmat
JURNAL ATOMIK Vol 1 No 2 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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Telah dilakukan uji “Validasi Metode Rapid Test Terhadap Penentuan Parameter Total Moisture (ar), Calorific Value (ar) dan Ash Content (ar) Di PT. Kaltim Prima Coal”. Penelitian ini bertujuan untuk hasil perbandingan metode rapid test terhadap standar yang telah di tetapkan atau di gunakan oleh PT. Kaltim Prima Coal pada sampel batubara dengan optimalisasi waktu saat preparasi tanpa tahap pengeringan (as received) dengan batubara ukuran 11,2 mm yang nanti akan di validasi untuk mengetahui reliable apa tidak digunakan untuk kegiatan operasional di laboratorium.Penelitian dilakukan dengan cara dua macam pengambilan data yaitu data standar dan data rapid, meliputi parameter Total Moisture, Calorific Value dan Ash Content. Lalu dilakukan optimalisasi waktu saat preparasi yaitu tanpa tahap pengeringan dengan batubara ukuran 11,2 mm. Kemudian dilakukan uji validasi metode uji bias dan uji t.Berdasarkan uji validasi metode diperoleh hasil Total Moisture dan Ash Content pada batubara ukuran 11,2 mm tanpa tahap pengeringan dapat digunakan dengan tetap memperhatikan variance yang ada, sedangkan pada analisa Calorific Value tanpa tahap pengeringan tidak dapat digunakan melihat hasil yang diperoleh jauh dalam range yang ditentukan.
Co-Authors -, Bohari Adha, Dhea Nur Agustin Pratiwi, Agustin Agustinus Pata, Agustinus Aidil Putra, Aidil Aisyah, Ema Agustina Akbar, Muh. Ali Albar Alhabib, Albar Alimuddin - Allo, Veliyana Londong Aman Sentosa Panggabean Amanda, Rika Anta Wiguna, Alvilah Ardiansyah - Arif Maulana Yusuf Arissah, Nur Aristawidyaningrum, Apta Aspin Aspin, Aspin Awalludin, Dudi B.K, Felicia A. Stevanie` Badi'ah, Hanif Bakhri, Asep Samsul Boby Royan alfadlil, Boby Royan Bohari Yusuf Chairul Saleh Cynthia Linaya Radiman Daniel Daniel Darman, Darmansyah DARMANSYAH . Dedy Prasetyo Dewi Sundari, Dewi Eko Haryanto Elanda, Anggi Fadillah, Fahmi Fauziah, Holidah Fitria Fitria Giovanni, Krisno Hajarudin, Iik Hammamiyah, Ulinnuha Hanafie, Daffy Mohamad Ismail Harpinus, Doki Harvina, Harvina Herman, Heri Hermawan K. Dipojono Indaryono Indaryono, Indaryono Iswara, Muhammad Wahyugo Jahada, Jahada Jeki Purnama Putra Jumadhi, Nurkattho Kartika Pratiwi Kurniasih, Ririn Feby Kusumastuti, Meidina Lumaku, Samuel Pangestu Enggal Magdaleni, Agustina Rahayu Malfiany, Rini Malik, Abdilla Manik, Sondang Hukum Parulian Margarita, Margarita Marsella, Yuni Maryadi, Wendri Maygusten, Maygusten Meiniarti, Meiniarti Mokhamad Wahidin Muhamad Abdulkadir Martoprawiro Muhamad Yulianto Mukhamad Nurhadi, Mukhamad Nasri Nasri Nasri, Nasri Nindia, Azrina Noor Hindryawati, Noor Nurul Fatimah Onsardi, Onsardi pakasi, Resy Palentin, Ersa Rizkita Pardian, Riki Ananda Pratiwi Hutabarat, Ilona Puji Astuti Qosim, Assyfa Machmudah Romdona, Muhammad Zulfikar Rostiani, Yeny Sahirah, Nabilah Sinar Saibun Sitorus Said, Yahya Santoso, Muzi Sari, Prinka Susmita Sarwawan, Ade Putri Hawiyah Sihotang, Recha Defrosa Morasih Samta Slamet Supriyadi Solly Aryza Subagyono, R. R Dirgarini J.N. Subagyono, R.R. Dirgarini Subagyono, RR Dirgarini Julia Nurlianti Sudarijati Sudirman, Irpan Sugiarti - Suherman, Yahya Suparya, Eman Suyitno Suyitno Syafriyanti, Yuly Ubaedi, Ubaedi Utami, Devira Ulva Virginia, Bintang Wachdijono, Wachdijono Wahyudi, Habib Putra Wahyuni, Ade Putri Yasifa, Firhan Yudiana, Yudiana Yulianto, R. Mega Yuliyanto, R. Mega Yuliyanto, R.Mega Zain, Fikri Naufal