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INDONESIA
JURNAL ATOMIK
Published by Universitas Mulawarman
ISSN : 25490052     EISSN : 25490052     DOI : -
Core Subject : Science, Social, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science
Jurnal Atomik (JA) is published twice a year (March and August) by Department of Chemistry, Faculty of Mathematics and Natural Sciences, Mulawarman University. Jurnal Atomik is a media for graduate students of Department of Chemistry to publish their research articles in Chemistry field including Analytical Chemistry, Inorganic Chemistry, Physical Chemistry, Organic Chemistry, and Biochemistry. The research articles that be submitted to Jurnal Atomik have to be approved by Editorial Board and in accordance with the rules of writing approved by Editor of Jurnal Atomik.
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Articles 7 Documents
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Search results for , issue "Vol 8 No 2 (2023)" : 7 Documents clear
MINI-REVIEW MENGENAI PEMANFAATAN MATERIAL BERBASIS POLIMER KOORDINASI BERPORI UNTUK PENYIMPANAN HIDROGEN Syaima, Husna; Intifadhah, Sahara Hamas
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

This review aims to summarize the various types of Metal-Organic Frameworks (MOFs) and their utilization for hydrogen storage. MOFs have high surface area, flexibility, good stability and tunability, various active sites, and abundant raw materials. These characteristics make MOFs worthy of being considered as a new material in hydrogen storage applications. The potential for using MOFs is very broad because its properties can be determined from the choice of metal and linker. Hydrogen gas storage commonly requires high pressure tanks whereas in liquid form, it requires cryogenic temperatures due to its very low boiling point, the challenge is to synthesize MOF with high hydrogen adsorption capacity under mild conditions. Moreover, it is crucial to learn about the relationship among the pore volume and surface area of MOFs, physisorption of hydrogen, and adsorption condition.
Pengaruh Massa Biosorben Kulit Batang Kayu Jawa (Lannea coromandelica) terhadap Kapasitas Adsorpsi Ion Cd(II) Wulandari, Niken Cahyaning; Widwiastuti, Hanandayu; Yudhistia Asworo, Riska
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Cadmium is one of the heavy metals that can contaminate bottled drinking water (AMDK) and cause health problems if its concentration more than the maximum limit. According to SNI 01-3553-2006, the maximum concentration of cadmium in AMDK is 0.003 mg/L. An effective method to reduce Cd levels is adsorption. In this research, use material diversification by utilizing Java Bark as biosorbent. This is because the Java Bark contains tannin compounds that can bind heavy metals. One of the factor that can affect adsorption is biosorbent mass. The aims of study is determine the effect of Java Bark biosorbent mass to the adsorption capacity of Cd(II) by Atomic Absorption Spectrophotometry (AAS). Java Bark biosorbent mass used were 0.1; 0.5; 1; 1.5; and 2 g. The results showed that the biosorbent mass of 0.1 g had the largest adsorption capacity of 9.47 mg/g. Meanwhile, the adsorption capacity of the biosorbent mass of 0.5-2 g tends to decrease because the surface of the biosorbent has been saturated and particle aggregation so that Cd(II) desorption. From the results of the study, it can be concluded that the Java Bark biosorbent with a mass of 0.1 g has the largest adsorption capacity for adsorption Cd(II).
ADSORPSI ZAT WARNA TEKSTIL UNGU DARI AIR LIMBAH INDUSTRI RUMAH TANGGA SARUNG TENUN SAMARINDA SEBERANG DENGAN MENGGUNAKAN SERBUK KULIT BUAH LAI (DURIO KUTEJENSIS (HASSK.) BECC.) Oliviani, Nadira; Wirawan, Teguh; Sitorus, Saibun
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Pewarna tekstil termasuk senyawa yang sulit terurai secara alami, sehingga dapat berdampak negatif terhadap lingkungan perairan. Penelitian ini bertujuan untuk memanfaatkan kulit buah lai yang dibuat menjadi serbuk sebagai adsorben untuk menyerap zat warna tekstil ungu pada air limbah sarung tenun Samarinda Seberang. Tahap pertama dibuat dengan membilas bubuk kulit buah lai dengan air suling mendidih, kemudian dipanggang dan diayak dengan ayakan 60 mesh. Karakterisasi dilakukan dengan menggunakan Fourier Transform Infared (FTIR) dan Scanning Electron Microscopy (SEM). Kajian adsorpsi zat warna tekstil ungu oleh serbuk kulit buah lai dilakukan dengan variasi waktu, pH dan konsentrasi. Hasil karakterisasi dengan FTIR menunjukkan adanya CO, CH bending, C=C, C=O, CC alkena,Gugus CH dan berdasarkan hasil karakterisasi SEM serbuk cangkang lainnya memiliki permukaan yang berpori. Kondisi optimum adsorpsi zat warna tekstil ungu 100 ppm untuk 25 mL dengan berat adsorben 0,01 g terjadi pada waktu kontak 2,5 menit dan pH 9. Adsorpsi zat warna tekstil ungu mengikuti pola adsorpsi isoterm Langmuir dan memiliki kapasitas adsorpsi maksimum sebesar 1176 .0486 mg/g. Aplikasi pada sampel air limbah sarung tenun ungu Samarinda Seberang dengan konsentrasi 143,5 ppm sebanyak 25 mL dan menggunakan berat optimum 0,01 g, waktu 2,5 menit dan pH 9 diperoleh %Adsorpsi sebesar 72,0119%. 5 menit dan pH 9. Adsorpsi zat warna tekstil ungu mengikuti pola adsorpsi isoterm Langmuir dan memiliki kapasitas adsorpsi maksimum sebesar 1176 .0486 mg/g.Aplikasi pada sampel air limbah sarung tenun ungu Samarinda Seberang dengan konsentrasi 143,5 ppm sebanyak 25 mL dan menggunakan berat optimum 0,01 g, waktu 2,5 menit dan pH 9 diperoleh %Adsorpsi sebesar 72,0119%. 5 menit dan pH 9. Adsorpsi zat warna tekstil ungu mengikuti pola adsorpsi isoterm Langmuir dan memiliki kapasitas adsorpsi maksimum sebesar 1176 .0486 mg/g. Aplikasi pada sampel air limbah sarung tenun ungu Samarinda Seberang dengan konsentrasi 143,5 ppm sebanyak 25 mL dan menggunakan berat optimum 0,01 g, waktu 2,5 menit dan pH 9 diperoleh %Adsorpsi sebesar 72,0119%.
PENGARUH JENIS PEREKAT DAN PENGERJAAN PERMUKAAN BIDANG REKAT TERHADAP KETEGUHAN GESER REKAT LAMINASI KAYU TERAP (Artocarpus elasticus Reinw. ex Blume) Utomo, Riko Birau; Dayadi, Irvin
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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This study aims to analyze the comparison of the adhesive shear strength value of the treatment used in the test sample, namely the difference in the type of adhesive with the difference in surface treatment of the adhesive plane. Analysis of variance (ANOVA) and LSD (Least Significant Difference) further test. The results of the analysis of variance showed that the effect of adhesive type (A) and surface treatment (B) on the adhesive shear strength of the laminate was very significant, while the interaction (AB) was not significant. Tests of physical and mechanical properties of laminated wood were carried out based on the JAS 234 - 2007 standard. The average moisture content of laminated timber was 11.59% and the average normal density was 0.329 g/cm³. The value of adhesive shear strength with A1 (epoxy) treatment of 69.79 kg/cm2 is greater than A2 (PVAc) of 63.98 kg/cm2 , while B3 (sanding) with the highest average of 72.86 kg/cm2 followed by B2 (planing) of 65.42 kg/cm2 and the lowest B1 (sawing) of 62.38 kg/cm2 . For the percentage of wood damage in the A1 (epoxy) treatment of 76.30% is higher than A2 (PVAc), while the treatment while B3 (sanding) with the highest average of 76.55% followed by B2 (planing) of 72.80% and the lowest B1 (sawing) of 71.00%, and has met the standard of JAS 234: 2007 (>54 kg/cm²).
SCREENING OF LIPASE FROM WATER BACTERIA IN BENANGA LEMPAKE DAM, NORTH SAMARINDA AND ITS POTENTIAL AS A DETERGENT ADDITIVE Vera, Hendrica Mini; Astuti, Winni; Pratiwi, Djihan Ryn
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Abstract

Lipase is an enzyme that can hydrolyze triglycerol into glycerol and free fatty acids. The aim of this research is to obtain lipase-producing bacteria and determine the potential of lipase from water bacteria in the water of the Benanga Lempake Dam, North Samarinda for biodetergent applications through stability test of lipase activity against several commercial detergents. Screening of lipase-producing bacteria was carried out on nutrient agar media containing olive oil and Rhodamine B. The results showed that seven isolates were capable of producing lipase. Based on the stability test of lipase on detergent, it can be seen that the activity of lipase decreased by more than 70% at the addition of 1% detergent.
UJI AKTIVITAS ANTIOKSIDAN EKSTRAK METANOL KULIT BUAH PISANG AMBON (Musa paradisiaca var. sapientum (L.) Kunt.) DENGAN METODE DPPH Tullah, Mirna Hidaya; Marliana, Eva; Erwin, Erwin
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Test of antioxidant activity of ambon banana peel (Musa paradisiaca var. sapientum (L.) Kunt.) methanol extract has been done. Test were carried out using a UV-Vis spectrophotometer based on the DPPH radical scavenging method with positive control of vitamin C. Antioxidant activity was obtained based on the IC50 value of 104,31 mg/L. IC50 value indicates that the peel of Ambon banana (Musa paradisiaca var. sapientum (L.) Kunt.) has antioxidant activity which is included in the moderate category.
DEGRADASI ZAT WARNA DIREK MERAH SECARA ELEKTROLISIS Rosigita, Ghatien; Hazlina, Nur; Choirunayli, Nila; Sari, Regina Purwita; Pangastuti, Dini Novita Mayang; Lestari, Sri
JURNAL ATOMIK Vol 8 No 2 (2023)
Publisher : Jurusan Kimia FMIPA UNMUL

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Direct dyes are synthetic dyes of the azo group which can quickly absorb on cellulose fibers and are capable of producing long-lasting quality printing dyes, so they are widely used in the textile industry. However, the waste originating from the dyeing process containing synthetic dyes is difficult to degrade naturally so it will cause environmental pollution. This study aims to degrade red direct dyes by electrolysis using PbO2/Pb electrodes from used batteries. This research was carried out by electrolyzing red direct dye solutions at various work potentials, variations in Na2SO4 concentrations, variations in electrolysis time, and variations in concentrations of red direct dyes. The absorbance of the direct dye solution before and after electrolysis was measured using a UV-VIS spectrophotometer at a wavelength of 550 nm. The results showed that the optimum working potential was 8 volts, the optimum concentration of 0,2 M Na2SO4 and the optimum electrolysis time was 65 minutes. At the optimum working potential, time and concentration of Na2SO4, an increase in the red direct solution concentration will decrease the percentage of decolorization.

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