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All Journal Jurnal Sains Dasar Jurnal Harpodon Borneo PROSIDING SEMINAR KIMIA Jurnal Kimia Mulawarman Molecular and Cellular Biomedical Sciences (MCBS) Indonesian Journal of Chemistry JURNAL ATOMIK
Bohari Yusuf
Jurusan Kimia Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Mulawarman
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry Education Energy Environmental Science Immunology & microbiology Medicine & Pharmacology Neuroscience

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PEMANFAATAN ARANG AKTIF SERBUK GERGAJI KAYU BANGKIRAI (Shorea lavefolia Endert) SEBAGAI ADSORBEN PELUMAS (OLI) BEKAS Youlanda, Desy; Sitorus, Saibun; Yusuf, Bohari
JURNAL ATOMIK Vol 7 No 1 (2022)
Publisher : Jurusan Kimia FMIPA UNMUL

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The use of bangkirai wood sawdust as adsorbent for used lubricant (oil) adsorption has been carried out. The purpose of this research is to find out how activated charcoal from bangkirai wood sawdust (Shorea Lavefolia Endert) can be used as a lubricating adsorbent (oil) seen from the testing and characterization of activated charcoal. The process of making bangkirai wood sawdust activated charcoal 0 is through a carbonization process at 500 C for 15 minutes and an activation process is carried out in activated charcoal by soaking using 25% H3PO4 solution for 24 hours. Determination of the quality of activated charcoal is carried out by testing the moisture content, ash content and iodine absorption capacity. The results obtained were the water content of activated charcoal H3PO4 25% which was 1,0590%, the ash content of activated charcoal H3PO4 25% was 0,0998% and the absorption capacity of activated charcoal H3PO4 activated charcoal 25% was 375,3253 mg/g. The optimum conditions for the adsorption of used lubricant (oil) were using activated charcoal adsorbent bangkirai wood sawdust, namely the mass of 1,5 grams and the contact time of 30 minutes. Keywords: Adsorption, Oil, Activated Charcoal, sawdust, bangkirai wood
KAJIAN LITERATUR PEMANFAATAN ADSORBEN ARANG AKTIF LIMBAH ORGANIK TERMODIFIKASI SURFAKTAN (SLS/SDS) TERHADAP ION LOGAM BERAT Terra, Patrycia Zulliani; Yusuf, Bohari; Lianasari, Ika Yekti
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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A literature review of the use of surfactant-modified organic waste activated charcoal adsorbents (SLS/SDS) on the percent absorption and adsorption capacity of heavy metal ions has been carried out. The surfactants used are sodium lauryl sulfhate (SLS) and sodium dodecyl sulfhate (SDS). The organic waste activated charcoal used includes rice husks, teak wood sawdust, bamboo, salak fruit skin and coconut shells. From this study, it was found that activated charcoal predominantly contains cellulose and its derivatives which can be a carbon source. Modification with surfactants (SLS/SDS) aims to increase the adsorption capacity, absorption percentage and also the surface area of the adsorbent. The modification process is by mixing surfactant and activated charcoal with a certain weight and then homogenizing. The mixture was then neutralized with distilled water. Next, it is placed in the oven at a certain temperature, then crushed and sieved with a 100 mesh size. Next, the activated charcoal-surfactant adsorbent is contacted with heavy metal ions such as Pb2+, Cr3+, Cr6+, and Ni2+. The absorption results obtained ranged from 93.50 – 99.89%, with an adsorption capacity of 0.144 – 81.300 mg/g. The size of the percent absorption value and adsorption capacity is influenced by the surface area, activator substance, contact time, pH, and also the concentration of the adsorbate. Keywords: Activated Charcoal, Heavy Metal Ions, SLS, SDS, Modification
MINI REVIEW: PENERAPAN BERBAGAI IONOFOR DALAM PEMBUATAN ELEKTRODA SELEKTIF ION (ESI) Pb2+ SECARA POTENSIOMETRI Padang, Dea Angelina Tiku; Yusuf, Bohari; Arif, Moh Syaiful
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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This mini review provides a brief overview of the application of various types of ionophores in the fabrication of ion-selective electrodes (ISE) for detecting Pb2+ ions using the potentiometric method. Ionophores are key components in ISEs that determine the selectivity and sensitivity of the electrode toward the target ion. The purpose of this review is to provide insights into selecting effective ionophores for potentiometric applications in detecting Pb2+ contamination in the environment. The method used in this review involves screening articles on google scholar, research gate, and garuda published between 2015 and 2022. In this review, five types of ionophores were identified as active membrane materials for the fabrication of Pb2+ ISEs, including chitosan; 1,10-dibenzyl-1,10-diaza-18-crown-6 with anionic site KTCPB; dithizone; 1,10-diaza-18-crown-6 with anionic site KTCPB; and pt-butylcalix[4]arena with anionic site KTCPB. These ionophores were found to have Nernst values of 29.1, 29.64, 29.5, 27.61, 26.15, and 27.61 mV/decade, respectively. Dithizone was identified as the most effective ionophore for detecting Pb2+ due to its Nernst value being closest to the theoretical Nernst value of 29.57 mV/decade. Keywords: Ion-Selective Electrode (ISEs), ionophores, potentiometry, Pb2+ ions, Nernst factor
PEMBUATAN BIODIESEL DARI LEMAK IKAN PATIN(Pangasius sp) DENGAN RADIASI GELOMBANG MIKRO Tanjung, Albayssag Faisal; -, Alimuddin; Yusuf, Bohari
JURNAL ATOMIK Vol 1 No 2 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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The research about made biodiesel from fat of patin fish (Pangasius sp) as raw material and known influence time exposure microwave radiation to concentration biodiesel that was produced have been done.Fat of patin fish heated to get oil extract. The oil extract was refluxed with methanol as reactant and H2SO4 as catalyst for 120 minute. Then transesterified with methanol as reactant and NaOH as catalyst with different time that was for 2, 4, 6, 8, and 10 minutes. The high product of biodiesel is 87,2 b/v that was exposured microwave radiation for 8 minutes. To knew kind of methyl ester in biodiesel used GC-MS and the high concentration of methyl ester in biodiesel is methyl oleat with concentration 24,74%.
PEMANFAATAN SERBUK ECENG GONDOK (Eichornia crassipes) TERAKTIVASI DENGAN SISTEM KANTONG CELUP SEBAGAI ADSORBEN PENJERAP ION LOGAM KADMIUM (Cd) Rochman, Mayasari Azhari; Saleh, Chairul; Yusuf, Bohari
JURNAL ATOMIK Vol 2 No 2 (2017)
Publisher : Jurusan Kimia FMIPA UNMUL

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The research on the use of water hyacinth powder (Eichornia crassipes) activated by adsorption method as the adsorption of cadmium metal ions (Cd) using dye bag system had been done. Water hyacinth powder was activated previously using HNO3 0,3 M then characterized by FT-IR spectroscopy. Infra-red spectrum showed hydroxyl cluster (-OH) from cellulose could function as the active sites of metal adsorption. Adsorption process was done by using variant contiguous time periods of metal ions, variant concentration of metal ions and addition of the metal ions of lead (Pb) ion adsorption on metal cadmium (Cd). From the results of the study Atomic Absorption Spectrophotometer (AAS) had shown the percentage of adsorption by water hyacinth powder adsorbent which was activated at 30 minutes of optimum contiguous time with optimum concentration 100 mg/L of 57,175 mg/L and 56,441% percentage of adsorption. In addition of the metal ions of lead (Pb) ion adsorption on metal cadmium (Cd) decreased to 20,681 mg/L with the percent adsorbed at 20,415% . Keywords: , , , , , AAS.
ANALISIS VARIASI NUTRISI AMMONIUM SULFAT DAN UREA DALAM PEMBUATAN BIOETANOL DARI KULIT PISANG KEPOK (Musa paradisiaca. L) DENGAN HIDROLISIS ENZIMATIK DAN FERMENTASI MENGGUNAKAN Sacchromyces Cerevisiae Sahriani, Andi; Yusuf, Bohari; Kartika, Rudi
JURNAL ATOMIK Vol 1 No 2 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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Telah dilakukan penelitian analisis variasi nutrisi ammonium sulfat dan urea dalam pembuatan bioetanol dari kulit pisang kepok (Musa paradisiaca. L) dengan fermentasi menggunakan saccharomyces cerevisiae. Pada  penelitian ini hasil  menunjukkan  konsentrasi  ammonium  sulfat  0,5 %, 1 % dan 1,5 % yang optimum masing-masing konsentrasi menghasilkan kadar etanol yaitu sebesar 7,799 %, 5,195 % dan 3,121 % sedangkan pada konsetrasi urea yang optimum masing-masing konsentrasi menghasilkan kadar etanol yaitu sebesar 21,409 %, 16,809 % dan 22,439 %. Waktu fermentasi optimum pada ammonium sulfat adalah 7 hari sedangkan waktu fermentasi pada urea yang optimum adalah 5 hari. Berdasarkan uji statistik koefisien determinasi R2 dan dilanjutkan dengan koefisien korelasi terdapat hubungan waktu fermentasi dan penambahan nutrisi ammonium sulfat terhadap kadar etanol dan waktu fermentasi dan penambahan nutrisi urea terhadap kadar etanol. Kata Kunci : Bioetanol, Pisang Kepok (Musa paradisiaca. L), Ammonium Sulfat, Urea.
PENGARUH ION PENGGANGGU Pb2+ DAN Fe2+ TERHADAP ELEKTRODEPOSISI LOGAM KADMIUM (Cd) DALAM SAMPEL AIR Miu, Agustinus; -, Alimuddin; Yusuf, Bohari
JURNAL ATOMIK Vol 1 No 1 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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The research was performed about interferes between of ion Pb2+ and Fe2+ on electrodeposition of ion Cadmium (Cd) in the water sample with electrode Al-Al. Electrolysis on solution 3CdSO4. 8H2O with three parameters, like time variation of electrolysis, influence variation of concentration Pb2+ ions and  influence of mix variation concentration of ions Pb2+ and Fe2+. The results showed that the longer electrolysis, more metal deposition on the electrode. Based on observation, variation the number level of metals Cadmium (Cd) that deposition on the electrode was up 83.62 % on 120 minutes. The variations of addition of ion Pb2+ (2, 4, 6, 8 and 10 mg/L) obtained percent decrease in the level of disruption to in a solution of ion Cadmium (Cd) with average 21.53 % with every addition concentration of disruptor ion Pb2+ give influence 0.21 %. The variations of the addition disruptor ion Pb2+ and Fe2+ (2, 4, 6, 8 and 10 mg/L) obtained percent decrease of disruption in solution of ion Cadmium (Cd) with result 18.46 %, with each addition of ion Pb2+ and Fe2+ obtained 0.96 %. This showed that the addition of the ion disruptor on proccess electrodeposition  given influence on Cadmium (Cd) electrodeposition itself, but for every addition of concentration given less significant effects. Keywords: Electrodeposition, electrode Al-Al and decrease percentace.
Analysis Of The Levels Of Vitamin C In Fruit Green Grapes (Vitis vinifera L.) With A Variation Of The Old Post-Harvest Storage Astria, Linda Yuniar; Yusuf, Bohari; Alimuddin, Alimuddin
JURNAL ATOMIK Vol 3 No 2 (2018)
Publisher : Jurusan Kimia FMIPA UNMUL

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A research on the analysis of the levels of vitamin C in fruit green grapes (Vitis vinifera L.) with a variation of the old post-harvest storage. The study was conducted with a variety of post-harvest storage time for 7 days at room temperature and coolant temperature, and test level of vitamin C used is the titration method iodimetri were then analyzed using independent t-test. The results showed that there was no effect of storage time on the vitamin C content of green grapes on storage at room temperature and coolant temperature. The highest levels of vitamin C contained in the storage day 5 the coolant temperature is 15.37 mg/g sample.
POTENSI TUMBUHAN CIPLUKAN (Physalis angulata Linn.) SEBAGAI ANTIOKSIDAN ALAMI Nuranda, Apri; Saleh, Chairul; Yusuf, Bohari
JURNAL ATOMIK Vol 1 No 1 (2016)
Publisher : Jurusan Kimia FMIPA UNMUL

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Potential of Ciplukan plant as natural antioxidants, the aim of this research is to determine the antioxidant potential of Ciplukan plant. First step is to know the active compound of the plant. Alkaloid and saponin are present at ciplukan leaves, stem and fruit, meanwhile steroid is present at leaves and stem. Moreover, flavonoid and triterpenoid is only present at stem and fruit, respectively. Phytochemical test are employed to dermine the active compound in the leaves, stem and fruit of ciplukan. Brine shimp lethality test are conducted to determine toxicity of the extract.The LC50 from the leaves extract is 962.054 ppm, stem extract is 753.558 ppm and at the fruit is 1.004,73 ppm. Antioxidant activity measurement conducted by reacting the sample with 1,1-difenil-2-pikrilhidrazil radical and measures the absorbance at wavelength 517 nm. Vitamin C is use as positive control. The inhibition concentration 50 vitamin C is 34.91 ppm. Meanwhile, the Inhibition concentration 50 of the leaves extract is 60.34 ppm, the stem extract is 56.36 ppm and the fruit extract is 63.46 ppm. These result indicated that Ciplukan plant is potensial as antioxidant source.Keywords: leaves, stems, fruit ciplukan (Physalis angulata.L), antioxidants,, DPPH and BSLT.
ADSORPSI ZAT WARNA DIREK HITAM MENGGUNAKAN ARANG AKTIF DARI MAHKOTA NANAS (Ananas comosus (L) Merr) TERMODIFIKASI KITOSAN Putri, Raisya Karina; Yusuf, Bohari; Widodo, Nanang Tri
JURNAL ATOMIK Vol 10 No 1 (2025)
Publisher : Jurusan Kimia FMIPA UNMUL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/ja.v10i1.1433

Abstract

Consumption of pineapple fruit (Ananas comosus (L) Merr) results in solid waste of about 45-65%, especially the pineapple crown. On the other hand, the textile industry uses dyes such as recolors that can cause pollution in the aquatic environment. This study aims to use activated charcoal from chitosan-modified pineapple crown as an adsorbent for direct dyes. The steps taken are characterizing activated charcoal, chitosan and chitosan-modified activated charcoal using Fourier Transform Infrared (FT-IR) and Scanning Electron Microscopy (SEM), optimizing with variations in mass, contact time and pH, and determining the maximum adsorption capacity. Preparation of pineapple crown activated charcoal carbonated at 400oC for 1 hour. Activated using 2% NaOH and then modified with chitosan. The chitosan-modified pineapple crown activated charcoal was used to adsorb the dye direct black and analyzed using a UV-Vis spectrophotometer. The results of FT-IR characterization of pineapple crown activated charcoal, chitosan and chitosan-modified pineapple crown activated charcoal indicated the presence of O-H, C-H (stretching), C=O and C-H (bending) groups, and in chitosan and chitosan-modified activated charcoal also indicated the appearance of overlapping N-H (amine), C-N (amide) and C-O-C groups. The results of SEM characterization of pineapple crown activated charcoal show that the surface has a smooth texture, chitosan has a rough and irregular texture surface and chitosan-modified pineapple crown activated charcoal has small clumps of various sizes and shapes. The results of the optimum conditions of adsorption of chitosan-modified pineapple crown activated charcoal on black rec dye occurred at a mass of 0.25 grams, contact time for 20 minutes and pH 7 with a maximum adsorption capacity of 11,6472 mg/g following the Langmuir isotherm.
Co-Authors Adhi Surya Pranata Surya Pranata Adhi Surya Pranata Surya Pranata, Adhi Surya Pranata Surya Agustin Pratiwi, Agustin Alimuddin - Alimuddin - Aman S Panggabean Aman S Panggabean, Aman S Aman Sentosa Panggabean Andriana, Nita Anton Rahmadi Arif, Moh Syaiful Arif, Moh. Syaiful Arif, Moh.Syaiful Arifin Syam Surya Arsyik Ibrahim Astria, Linda Yuniar Chairul Saleh Desy Ridho Rahayu Erwin Erwin Fenny Dian Lestari Finqo Aprianto Firzan Nainu Hamsina Hamsina Herman Herman Indri Ayu Lestari Indri Ayu Lestari, Indri Ayu Islamudin Ahmad Khasanah, Manja’a Laode Rijai Lianasari, Ika Yekti Linda Ajang Linda Ajang, Linda Marlinawati - Mirhansyah Ardana Miu, Agustinus Mutia Wulandari Nanang Tri Widodo Nisa, Hairin Nuranda, Apri Padang, Dea Angelina Tiku Putri, Marlisa Roro Putri, Raisya Karina RAHMAT GUNAWAN Rahmat GUnawan Rahmat Gunawan Rani Novia Ulya Ritson Purba Ritson Purba, Ritson Rochman, Mayasari Azhari Rudi Kartika, Rudi Sahriani, Andi Saibun Sitorus Sari, Ros Mita Selvi Jumiatul Astati Septiana, Rientha Siti Nurliana Siti Nurliana, Siti Syaiful Arif Tangke Veronika Tanjung, Albayssag Faisal Terra, Patrycia Zulliani Tri Paus Hasiholan Hutapea, Tri Paus Hasiholan Youlanda, Desy Zaki, Faisal