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RAHMAT GUNAWAN
Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman
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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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Abstract

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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Abstract

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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Abstract

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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Abstract

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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Abstract

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.
UTILIZATION OF ACTIVATED OF KEPOK BANANA PEEL POWDER (Musa paradisiaca L.) AS AN ADSORBENT OF CADMIUM METAL IONS (Cd2+) Malik, Abdilla; -, Alimuddin; Gunawan, Rahmat
JURNAL ATOMIK Vol 6 No 1 (2021)
Publisher : Jurusan Kimia FMIPA UNMUL

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Research on the adsorption of cadmium metal ions (Cd2+) using activated adsorbent from Kepok banana peel powder (Musa paradisiaca L.) has been carried out. Determination of the functional groups contained in the adsorbent used Fourier Transform Infrared Spectroscopy (FT-IR) instruments indicate the presence of O-H, C-O and N-H groups. Characterization of pores in the adsorbent using Scanning Electron Microscope (SEM) instruments that show the occurence of pore and cavity enlargement on the surface of the adsorbent, as well as the appearance of finer topography after the activation process. The result of this study indicate that the adsorbent of Kepok banana peel powder can absorb cadmium metal ions (Cd2+) with the best absorption occurs at optimum conditions pH 5, 60 minutes contact time and a concentration of 1.5 ppm. The adsorption capacity of the adsorbent of Kepok banana peel powder at the optimum conditions is 0.04991 mg/g.
DECREASING OF PHENOL CONCENTRATION IN BALIKPAPAN SEA WATER POLLUTED BY USING ADSORPTION METHOD Yulianto, Muhamad; Sitorus, Saibun; Gunawan, Rahmat
JURNAL ATOMIK Vol 5 No 1 (2020)
Publisher : Jurusan Kimia FMIPA UNMUL

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Research on decreasing of phenol concentration in the Balikpapan seawater polluted by using the adsorption method, the purpose of this study was to determine the characteristics of activated carbon and adsorption percent to adsorb phenols with time and weight variations of the adsorbent. The results of the characteristics of activated carbon using SEM show that the carbon pores after activation are greater than before activation. In addition, phenol adsorption with time variations in seawater samples obtained optimal time at 30 minutes with 62% and the weight variation of the adsorbent obtained percentage of maximum adsorption at a weight of 12 grams is 51.11%.
INHIBISI XANTIN OKSIDASE OLEH FRAKSI ETIL ASETAT DARI DAUN JARUM TUJUH BILAH (Pereskia bleo (Kunth) D.C) SEBAGAI ANTIHIPERURISEMIA Sari, Prinka Susmita; Sitorus, Saibun; Gunawan, Rahmat
JURNAL ATOMIK Vol 3 No 2 (2018)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

“Jarum Tujuh Bilah” leaves (Pereskia bleo (Kunth) DC) are a medicinal plant that often used in traditional medicine to reduce uric acid levels. This plant contains secondary metabolites which have the potential to inhibit xanthine oxidase activity. In this study phytochemical tests were conducted on ethanol extract and ethyl acetate fraction of “Jarum Tujuh Bilah” leaves (Pereskia bleo (Kunth) DC), then isolated xanthine oxidase from fresh cow's milk, and the activity of ethyl acetate fraction against xanthine oxidase. The results showed that ethanol extract contained flavonoid, alkaloid and phenolic compounds. Then ethyl acetate fraction contained flavonoid and alkaloid compounds. The value of xanthine oxidase activity from the isolation of xanthine oxidase is 0.00063 U/mL in the fractionated enzyme and 0.00025 U/mL in the supernatant. The inhibition of 92.06% ethanol extract and the inhibition of ethyl acetate fraction was 88.89%.
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 Alimuddin Allo, Veliyana Londong Aman Sentosa Panggabean Amanda, Rika Anta Wiguna, Alvilah Ardiansyah - Arif Maulana Yusuf Arissah, Nur Aristawidyaningrum, Apta Aspin Aspin, Aspin B.K, Felicia A. Stevanie` Badi'ah, Hanif Boby Royan alfadlil, Boby Royan Bohari Yusuf Cynthia Linaya Radiman Daniel Daniel Darman, Darmansyah DARMANSYAH . Dedy Prasetyo Dewi Sundari, Dewi Eko Haryanto Elanda, Anggi Fadillah, Fahmi Giovanni, Krisno Hajarudin, Iik Hammamiyah, Ulinnuha Harpinus, Doki Harvina, Harvina Herman, Heri Hermawan K. Dipojono Iswara, Muhammad Wahyugo Jahada, Jahada Jeki Purnama Putra Kartika Pratiwi Kurniasih, Ririn Feby Kusumastuti, Meidina Londong Allo, Veliyana Lumaku, Samuel Pangestu Enggal Magdaleni, Agustina Rahayu Malfiany, Rini Malik, Abdilla Manik, Sondang Hukum Parulian Margarita, Margarita Marsella, Yuni Maryadi, Wendri Maygusten, Maygusten Mokhamad Wahidin Muhamad Abdulkadir Martoprawiro Muhamad Yulianto Mukhamad Nurhadi, Mukhamad Nasri Nindia, Azrina Noor Hindryawati, Noor Nurul Fatimah Onsardi, Onsardi pakasi, Resy Palentin, Ersa Rizkita Pardian, Riki Ananda Puji Astuti Qosim, Assyfa Machmudah Romdona, Muhammad Zulfikar Rostiani, Yeny Sahirah, Nabilah Sinar Saibun Sitorus Said, Yahya Saleh, Chairul Sari, Prinka Susmita Sarwawan, Ade Putri Hawiyah Sihotang, Recha Defrosa Morasih Samta Siswahyudianto Slamet Supriyadi Solly Aryza Subagyono, R. R Dirgarini J.N. Subagyono, R.R. Dirgarini Subagyono, Raden Roro Dirgarini Julia Nurlianti Subagyono, RR Dirgarini Julia Nurlianti Sudarijati Sugiarti - Suherman, Yahya Suyitno Suyitno Syafriyanti, Yuly Utami, Devira Ulva Wahyudi, Habib Putra Wahyuni, Ade Putri Yasifa, Firhan Yulianto, R. Mega Yuliyanto, R. Mega Yuliyanto, R.Mega Zain, Fikri Naufal