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All Journal Natural Science: Journal of Science and Technology KOVALEN: Jurnal Riset Kimia
Moh. Mirzan
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Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT

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APLIKASI FOTOKATALIS TIO2-ZEOLIT UNTUK MENURUNKAN INTENSITAS ZAT WARNA TARTRAZIN SECARA FOTOKATALITIK Firmansyah, Firmansyah; Mirzan, Moh.; Prismawiryanti, Prismawiryanti
Natural Science: Journal of Science and Technology Vol 4, No 1 (2015): Volume 4 Number 1 (March 2015)
Publisher : Univ. Tadulako

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Abstract

Telah dilakukan penelitian aplikasi fotokatalis TiO2-Zeolit untuk menurunkan intensitas zat warna Tartrazin secara fotokatalitik.Penelitian ini bertujuan untuk mencari kombinasi dosis fotokatalis dan waktu penyinaran terbaik untuk menrunkan intensitas zat warna Tartrazin.KonsentrasiTartrazin 20 ppm sebanyak 100 mL ditambahkan dengan 50; 75; 100; 125 dan 150 mg fotokatalis TiO2-Zeolit dengan penyinaran sinar-UVA (365 nm) selama 40; 80; 120; 160 dan 200 menit. Hasil penelitian menunjukkan penggunaan dosis fotokatalis TiO2-Zeolit sebanyak 100 mg dengan lama radiasi UV A 200 menit mampu mendegradasi Tartrazin sebesar 77,10 %.
KARAKTERISASI ENZIM AMILASE DARI KECAMBAH BIJI JAGUNG KETAN (ZEA MAYS CERATINA L.) Bahri, Syaiful; Mirzan, Moh.; Hasan, Moh.
Natural Science: Journal of Science and Technology Vol 1, No 1 (2012)
Publisher : Univ. Tadulako

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The research about characterization of the amylase enzyme from germination glutinous corn seed (Zea mays ceratina L.) was done. The aims of this research is to know the effect of germination time to the activity of the amylase enzyme and characteristics of the amylase enzyme from germination glutinous corn seed (Zea mays ceratina L.). The research was conducted through four phases that is germination stage, extraction, isolation, and characterization. The research device used was Completelly Randomized Design (CRD) and to be continued by BNJ test critical level 5%. Result showed that the germination time that produces the highest activity was 36 hours and the activity of enzyme was 0.0557 sec-1. Isolation of the amylase enzyme purified by salting out method used technical (NH4)2SO4 at concentration 55% with activity of 0.0394 sec-1. The optimum pH was 9, and the activity of enzyme was 0.0207 sec-1. Maximum substrate concentration with the activity 0.0476 sec-1 give at 12.5% (w/v), while the optimum temperature for activity 0.0229 sec-1 was 70 oC. From examination manner analysis for all of free variables results very real effect on the amylase enzyme activity, while the BNJ test critical level of 5% showed a real difference with the other treatments of every variable.
PEMANFAATAN ARANG AKTIF KULIT KACANG TANAH SEBAGAI ADSORBEN BESI (Fe) PADA AIR SUMUR Di DESA PENDOLO, KEC.PAMONA SELATAN, KAB. POSO Ofelman Talunoe; Nurhaeni Nurhaeni; Moh. Mirzan
KOVALEN: Jurnal Riset Kimia Vol. 1 No. 1 (2015)
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

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ABSTRAK Telah dilakukan penelitian Pemanfaatan Arang Aktif Kulit Kacang Tanah Sebagai Adsorben Besi (Fe) pada air Sumur. Penelitian ini bertujuan untuk mengetahui pengaruh waktu kontak arang aktif kulit kacang tanah  dan pengaruh penggunaan berulang adsorben. Metode yang digunakan dalam penelitian ini adalah metode SSA. Rancangan penelitian yang diterapkan adalah RAL, dengan variabel bebas yaitu waktu kontak dan penggunaan berulang adsorben. Pada penelitian ini diterapkan variasi waktu kontak adsorbsi sebesar 30, 60, 90, 120 dan 150 menit dan variasi penggunaan berulang adsorben (P) P1, P2, P3, P4, P5, P6, P7, P8, P9 dan P10. Hasil penelitan ini menunjukan bahwa arang aktif kulit kacang tanah  25 g mempunyai daya adsorpsi terbaik pada variasi waktu kontak dicapai pada menit ke-120 dengan kadar besi pada air sumur I sebesar 1,34 mg/L dan  air sumur II sebesar 0,84 mg/L dan untuk pengaruh variasi penggunaan berulang adsorben bertujuan untuk menetukan efektifitas daya serap adsorben arang aktif  dan diperoleh penggunaan pertama yang lebih efektif. Arang aktif kulit kacang tanah dapat digunakan sebagai adsorben penurunan kadar besi pada air sumur sebanyak 9 kali penggunaan. Kata Kunci: arang aktif, adsorben, kulit kacang, kadar besi, air sumur.
Sintesis dan Karakterisasi Polivinil Alkohol (PVA) Terlapis Polieugenol: Synthesis And Characterization of Polyvinyl Alcohol (PVA) Coated with Polyeugenol Rahim, Erwin Abdul; Ridhay, Ahmad; Sitti Nur Halizah; Indriani; Sosidi, Husain; Khairuddin; Inda, Nov Irmawati; Nurakhirawati; Mirzan, Moh.; Amar, Aini Auliana
KOVALEN: Jurnal Riset Kimia Vol. 10 No. 1 (2024): April Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2024.v10.i1.17088

Abstract

A study has been conducted on materials containing polyvinyl alcohol (PVA) coated with poly eugenol. This research aims to explore the synthesis process and properties of PVA coated with poly eugenol. Characterization of PVA includes tensile strength measurement and surface observation using SEM. Additionally, the antioxidant activity of PVA was also tested using the DPPH method. In this study, PVA films were obtained by dissolving PVA in a water solvent. The characterization results indicate that the tensile strength ranges from 25.56 to 271.10 Mpa, elongation reaches 315.20 to 320%, and the young modulus ranges from 4.05 to 6.27 Mpa. Surface observation with SEM shows a smooth surface without pores. The antioxidant activity test shows IC50 values ranging from 84.11 to 175.37 ppm.
Isotermal Adsorpsi Ion Tembaga (II) Menggunakan Arang Tongkol Jagung (Zea mays L.) Teraktivasi Kalium Permanganat: Isothermal Adsorption of Copper (II) Ions Using Charcoal from Corn Cobs (Zea mays L.) Activated by Potassium Permanganate Habiba, Lisma; Inda, Nov Irmawati; Prismawiryanti; Sosidi, Husain; Sumarni, Ni Ketut; Puspitasari , Dwi Juli; Mirzan, Moh.; Jusman
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 1 (2023): April Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i1.16292

Abstract

Corn cobs which generally only become waste can be processed into activated carbon and used for the absorption of heavy metals, such as copper(II) ions. This study aims to determine the morphology of corn cobs charcoal after activation, determine the isothermal adsorption model of copper (II) metal ions on corncob-activated carbon, and then determine the adsorption capacity of copper (II) metal ions on corncob-activated carbon. The morphology of the corncob-activated charcoal obtained was analyzed using Scanning Electron Microscopy (SEM). Isothermal adsorption of copper (II) ions was carried out with various concentrations of copper (II) ions of 5, 10, 20, 50, and 100 ppm. The results of the analysis using SEM showed that the surface shape of the corncob-activated charcoal is regular and has pores with a pore diameter obtained in the range between 1.08-1.26 m and 1.38-1.59 m. The mechanism of adsorption of copper (II) ions by corncob-activated charcoal using KMnO4, following the Freundlich isothermal model with a value of R2 0.9993 with an adsorption capacity of 51 x 10-4 mmol/L. The utilization of activated carbon from corn cobs that are activated by potassium permanganate is very effective for adsorbing copper metal ion pollutants through an adsorption mechanism on the surface of activated carbon.
Pemanfaatan Karbon Aktif Kulit Kacang Tanah untuk Menurunkan Kadar Ion logam Ca2+ dan Mg2+ dalam Air: Utilization Peanut Shell Activated Carbon to Reduce Levels of Ca2+ and Mg2+ in Water Yanti, Wilda; Sosidi, Husain; Indriani; Prismawiryanti; Puspitasari, Dwi Juli; Mirzan, Moh.; Abdul Rahim, Erwin; Irmawati Inda, Nov
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 2 (2023): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i2.16397

Abstract

Peanut shell has a high cellulose content as a carbon source which can be used as a basic ingredient for making activated charcoal. Research on peanut shells used as activated charcoal aims to determine the effect of contact time and pH on reducing levels of metal ions Ca2+ and Mg2+ in water. The research was conducted using contact time variables (30, 60, 90, 120, and 150 minutes) and pH (4, 5, 6, 7, and 8). Measurement of adsorbed metal levels was determined by using an Atomic Absorption Spectrophotometer (AAS). The research results obtained showed that variations in contact time could reduce Ca2+ levels by 77.46% -84.89% and Mg2+ by 86.88%-88.91%. Adsorbents with variations in pH can reduce Ca2+ levels by 63.48%-88.74% and Mg2+ by 90.35%-94.49%. The best conditions for the absorption of Ca2+ and Mg2+ ions were a contact time of 60 minutes and pH 4. The adsorbent was applied to reduce Ca2+ and Mg2+ levels in water with different hardness levels. The results of the analysis of water samples from two different locations had Ca2+ levels of 94.180 mg/L and 210.20 mg/L, while Mg2+ levels were 13.536 mg/L and 17.420 mg/L. The percentages of Ca2+ adsorption for the two samples were 96.19% and 77.08%, and the percentages of Mg2+ adsorption for the two samples were 21.16% and 10.63%. Carbon from peanut shells activated with sodium acetate has the potential to be used to reduce hardness in water.
Co-Authors A.A. Ketut Agung Cahyawan W Ahmad Ridhay Aini Auliana Amar Dwi Juli Puspitasari Erwin Abdul Rahim Firmansyah Firmansyah Habiba, Lisma Husain Sosidi Indriani Irmawati Inda, Nov Khairuddin Khairuddin Moh. Hasan Ni Ketut Sumarni Nov Irmawati Inda Nurakhirawati Nurhaeni Nurhaeni Ofelman Talunoe Prismawiryanti Prismawiryanti Sitti Nur Halizah Yanti, Wilda