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All Journal Warta AKAB Helium: Journal of Science and Applied Chemistry
Imas Solihat
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Environmental Science Materials Science & Nanotechnology

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PEMBUATAN BIOETANOL DARI BIJI BINTARO (CERBERA manghas Lin.) DENGAN PROSES FERMENTASI RAGI DAN HIDROLISIS DENGAN ASAM SULFAT Imas Solihat; Sri Redjeki Setyawati
Journal Warta AKAB Vol 44, No 2 (2020): Warta AKAB
Publisher : Politeknik AKA Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55075/wa.v44i2.19

Abstract

The process of making bioethanol from Bintaro seeds (CERBERA manghas Lin.) has been carried out with a hydrolysis process through a sulfuric acid catalyst at a temperature of 60oC for 30 minutes and fermentation using yeast. Obtained glucose levels of 1.43% with 1.0 M sulfuric acid catalyst. For 30 minutes of hydrolysis time, a glucose level of 8.8% was obtained after the Bintaro seeds were fermented. Fermentation time for 5 days at a temperatur 100oC gives the ethanol content of 0.17%.
STUDI KESETIMBANGAN ISOTHERM ADSORBSI LOGAM NIKEL(II) PADA LIMBAH CAIR MENGGUNAKAN CANGKANG TELUR : ADSORBEN BERBIAYA MURAH Mohammad Jihad Madiabu; Joko Untung; Imas Solihat
Journal Warta AKAB Vol 44, No 2 (2020): Warta AKAB
Publisher : Politeknik AKA Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55075/wa.v44i2.16

Abstract

Cangkang telur merupakan limbah rumah tangga yang melimpah. Penelitian ini bertujuan untuk melakukan investigasi model kesetimbangan yang terjadi pada proses adsorbsi ion logam nikel(II) menggunakan cangkang telur sebagai adsorben. Proses adsorbsi menggunakan metode batch dengan waktu kontak tetap (60 menit) dan konsentrasi awal larutan nikel(II) yang berbeda-beda. Persentase efektifitas adsorbsi maksimum sebesar 93.91% menunjukkan cangkang telur cukup efektif digunakan sebagai alternatif adsorben dalam proses pengolahan logam nikel(II) pada limbah cair. Model kesetimbangan proses adsorbsi mengikuti model isotherm Langmuir dengan nilai kapasitas adsorbsi sebesar 1.99 mg/g.
Fabrication and Characterization of Syringe Carbon Paste Electrode for Electrochemical Measurement Cahyotomo, Anom; Mohammad Jihad Madiabu; Arie Pratama Putra; Ardina Purnama Tirta; Imas Solihat; Dicky Annas
Helium: Journal of Science and Applied Chemistry Vol. 4 No. 2 (2024): Helium: Journal of Science and Applied Chemistry
Publisher : Study Program of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/helium.v4i2.5

Abstract

This study aims to fabricate and characterize a syringe carbon paste electrode (SCPE) using K3Fe(CN)6 10 mM solution with cyclic voltammetry technique. Characterization is performed by varying pH (pH 4, 7, and 10) and scan rate (30 - 100 mV/s) so that the characteristics of SCPE can be observed. The K3Fe(CN)6 10 mM solution test results at various pH variations obtained the largest anodic peak current (Ipa) at pH 10 was 44.75 µA. The scan rate results at various pH showed linear results with the diffusion coefficient of 1.77 x 10-6 cm2/s, 1.65 x 10-6 cm2/s, and 2.50 x 10-6 cm2/s with r values of 0.9994, 0.9975, and 0.9992 for pH 4, pH 7, and pH 10 respectively. This indicated that a diffusion process controlled this system's mass transfer in various pH. The detection of nitrite ions at a concentration of 2 mM showed a clear oxidation peak, with the highest Ipa value of 61.28 µA in pH 7 buffer solution.
Co-Authors Ardina Purnama Tirta Arie Pratama Putra Cahyotomo, Anom Dicky Annas Joko Untung Madiabu, Mohammad Jihad Sri Redjeki Setyawati