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Irfan Ashari Hiyahara
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Chemistry

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ADSORPSI ION LOGAM BERAT Pb(II) DENGAN BIOCHAR RESIDU PIROLISIS KAYU Macaranga gigantea Novi Artika; R.R. Dirgarini Julia N; Irfan Ashari Hiyahara
PROSIDING SEMINAR KIMIA SEMINAR NASIONAL KIMIA 2019
Publisher : PROSIDING SEMINAR KIMIA

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Abstract

Adsorpsi ion logam berat Pb(II) dengan biochar residu pirolisis kayu Macaranga gigantea telah dipelajari. Kapasitas adsorpsi untuk variasi pH memiliki kapasitas adsorpsi sebesar 8,65 mg/g dengan pH optimum yaitu 4. Kapasitas adsorpsi untuk variasi waktu memiliki kapasitas adsorpsi sebesar 6.58 mg/g dengan waktu optimum yaitu 60 menit dan untuk kapasitas adsorpsi untuk variasi konsentrasi memiliki kapasitas adsorpsi sebesar 78,21 mg/g dengan konsentrasi maksimum 200 ppm. Kata Kunci: Biochar, Macaranga gigantea, Pb, Adsorpsi.
MINI REVIEW: PEMBUATAN DYE SENSITIZED SOLAR CELL (DSSC) MENGGUNAKAN SEMIKONDUKTOR TIO2 DENGAN ZAT WARNA ANTOSIANIN Ziyyanatul Luthfiyyah; Noor Hindryawati; Irfan Ashari Hiyahara
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Dye Sensitized Solar Cell (DSSC) is a tool or device that can convert light energy into electrical energy. Dye Sensitized Solar Cell (DSSC) is a solar cell consisting of a pair of glass electrodes, namely the working electrode and the counter electrode flanking the electrolyte. The working electrode is composed of TCO (Transparent Conducting Oxide) glass which is then coated with TiO2 and a dye containing anthocyanins as a charge carrier photosensitizer. The counter electrode is composed of TCO glass coated with carbon which is used as a catalyst to accelerate the redox reaction with the electrolyte. Anthocyanins can absorb photon energy at a distance of about 520-550 nm. Dye will excitate due to absorption of photon energy. The more dye attached, it will produce more photoelectrons where the size of the TiO2 semiconductor affects the dye attached or attached during the coloring process. Natural anthocyanins can be obtained from plant materials such as the crown of the gods, dragon fruit, red cabbage, purple sweet potato and buni fruit. Natural dye is an alternative that is non-toxic, renewable and easily degraded so that it is friendly to the environment. The results of the efficiency of the DSSC using natural anthocyanins showed good results, namely 0.38%. so it can be concluded that anthocyanins from natural dyes can be used in the manufacture of DSSC. Keywords: Dye Sensitized Solar Cell, Anthocyanins, TiO2 Semiconductor, Natural dye
GREEN SYNTHESIS NANOPARTIKEL PERAK DENGAN BANTUAN GELOMBANG ULTRASONIK: MINI REVIEW Atika Aulia Ahmad; Noor Hindryawati; Irfan Ashari Hiyahara
PROSIDING SEMINAR KIMIA Vol 1 No 1 (2022): Prosiding SNK 2022
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Silver nanoparticles are particles composed of silver oxide with a size of 1-100 nm that can be made by the bottom-up method through the reduction of Ag+ ions with the addition of a bioreductors and ultrasonic waves. Green Synthesis is currently very popular in the fields of science, technology and industry because it is more environmentally friendly. The use of ultrasonic waves in this synthesis can help to time-efficient and increase the reaction rate. Thus, the purpose of this review is to determine the characteristics of nanoparticles synthesized using ultrasonic waves based on UV-Vis and TEM spectroscopic data. The results of the literature show that the factors that affect the stability of the nanoparticles include the molar concentration of AgNO3, the volume of the extract, the stabilizing agent and the reaction time. The change of Ag+ to Ag0 was shown qualitatively by changing the color of the solution from clear/light yellow to brown. Wavelength values of typical nanoparticles appear at 420-440 nm. In the presence of ultrasonic waves it can produce AgNPs sizes between 8 - 33.8 nm and spherical and uniform nanoparticle shapes
PEMANFAATAN ARANG AKTIF BONGGOL JAGUNG (Zea mays) SEBAGAI ADSORBEN RADIKAL ALKIL PEROKSIDA PADA MINYAK JELANTAH : STUDI PENURUNAN BILANGAN PEROKSIDA Hasriani; Saibun Sitorus; Irfan Ashari Hiyahara
PROSIDING SEMINAR KIMIA Vol 4 No 1 (2025): Prosiding SNK 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Used cooking oil is known to contain lipids resulting from the oxidation process at high heating temperatures. The oxidation process in cooking oil continuously causes the formation of alkyl peroxide radicals. Used cooking oil is at risk of disrupting water and soil ecosystems if disposed of into the environment without further management. In this study, a characterization test of corn cob activated charcoal was carried out based on SNI 06-3730-1995, characterization using the Surface Area Analyzer (SAA) instrument and a test of the peroxide number in used cooking oil. The results of the activated charcoal characterization test showed that it still met the requirements of SNI 06-3730-1995 and showed an increase in surface area of ​​109,705 m2/g in the SAA test. In the control before the adsorption process using corn cob activated charcoal, the peroxide number was 30 mek O2/kg. In the refining process of used cooking oil, there was a decrease in the peroxide number. The optimum decrease in the peroxide number was found at a charcoal mass of 4 g with a contact time of 45 minutes. The peroxide value obtained was 8 mek O2/kg, which was a decrease of around 73.33% from the used cooking oil before refining. Keywords: Activated Charcoal, Alkyl Peroxide Radicals, Surface Area Analyzer, Used Cooking Oil, Zea Mays.
Co-Authors Atika Aulia Ahmad Hasriani Noor Hindryawati Novi Artika R.R. Dirgarini Julia N Saibun Sitorus Ziyyanatul Luthfiyyah