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All Journal Jurnal Tadris Kimiya Indonesian Journal of Chemistry Bivalen: Chemical Studies Journal
Arif, Ainun Rezkiva
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Chemical Engineering, Chemistry & Bioengineering Chemistry Education

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Pemanfaatan tulang bebek sebagai adsorben metilen biru pada limbah industri tekstil Widiyowati, Iis Intan; Arif, Ainun Rezkiva; Habibah, Sitti; Andriani, Ega; Sari, Lovya Riska; Izzati, Zakiyah Ayu Noor
Bivalen: Chemical Studies Journal Vol. 5 No. 1 (2022)
Publisher : Bachelor Degree Program of Chemical Education - Mulawarman University | Program Studi S-1 Pendidikan Kimia - Universitas Mulawarman

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Abstract

Industri tekstil saat ini, menimbulkan masalah baru yaitu limbah. Salah satunya di Kalimantan Timur, merupakan penghasil tesktil dibidang tenun sarung Samarinda. Dalam pewarnaan tenun, menggunakan pewarna alami dan sintesis. Penggunaan pewarna sintesis dapat menghasilkan limbah yang sangat berbahaya jika di buang langsung ke lingkungan, terutama sungai. Salah satu cara yang dapat digunakan untuk mengurangi limbah cair zat warna adalah dengan menggunakan adsorben. Tujuan dari penelitian ini adalah untuk mengetahui massa optimum, waktu kontak optimum, dan pH optimum terhadap adsorbsi metilen biru dengan menggunakan adsorben teraktivasi dari tulang bebek serta penentuan model kinetika adsorbsi dan isoterm adsorbsi. Teknik analisis data menggunakan Microsoft Excel 2010. Hasil penelitian menunjukkan bahwa massa optimum adsorben yang diperoleh pada 0,75 gram yang diaktivasi selama 6 jam dengan suhu 600℃, waktu kontak optimum diperoleh pada 40 menit, dan derajat keasaman (pH) optimum berada pada pH 5, serta model kinetika adsorbsi yang diperoleh ialah pada model pseudo orde 2 dan model isoterm adsorpsi Freundlich.
Analysis of Argument-Driven Inquiry Activity in Chemistry Textbooks Widiyowati, Iis Intan; Arif, Ainun Rezkiva; Sukemi, Sukemi
Jurnal Tadris Kimiya Vol 8 No 2 (2023)
Publisher : Department of Chemistry Education, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jtk.v8i2.21243

Abstract

Argument-Driven Inquiry (ADI) in science learning can improve students' argumentation skills and understanding of concepts. In the textbooks, it is important to have ADI activities inside. This research aims to analyze ADI activities in the high school chemistry textbook Revised Curriculum 2013. This research used nine indicators of ADI activities: questions, evidence, student explanation, scientific theories, argumentation, communication and justification, analysis, connection, investigation report, and reflection. The research method used a descriptive instrument as an analysis sheet prepared based on ADI activities. Data was collected using documentation techniques and data analysis using content analysis of ADI activities. The results showed that the reliability test of the data obtained was 0.94 in the very good category. The ADI activity most found in textbooks is evidence activity, with a percentage of 31.25 Meanwhile, the textbook needs to explain question and answer and reflection activities. The textbook needs to increase ADI activities that support student-centered learning and teaching.
Synthesis and Characterization of MnO2 Nanoparticle Composite and Palm Kernel Shell-Based Activated Carbon as Supercapacitor Electrode Candidates Arif, Ainun Rezkiva; Zakir, Muhammad; Ahmad, Ahyar; Raya, Indah; Taba, Paulina; Rasyid, Herlina
Indonesian Journal of Chemistry Vol 26, No 2 (2026)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.110797

Abstract

Palm kernel shells (PKS) are a biomass waste rich in carbon and low in ash content, making them suitable for conversion into supercapacitor electrode materials that support the principles of the blue economy and green technology. This study presents a novel synthesis approach for supercapacitor electrode materials by combining activated carbon derived from hydrothermally carbonized PKS biomass waste (AC-PKS) with MnO2 nanoparticles. Carbon activation in this study was carried out using chemical and physical activation approaches to produce a microporous structure with a high surface area. The AC-PKS/MnO2 composite was then synthesized through a redox reaction deposition using KMnO4 to create materials that exhibit potential properties between double-layer capacitance and pseudocapacitive behavior. Electrochemical testing with CV and GCD showed an increase in the specific capacitance of the AC-PKS/MnO2 composite of 67.85 and 46.91 F/g, respectively. These findings indicate the scientific contribution of combining biomass-derived activated carbon with metal oxides as a potential supercapacitor electrode. The implications of these results suggest that AC-PKS/MnO2 not only offers a sustainable material solution but also opens up opportunities for the development of high-capacity supercapacitor electrodes for future energy storage applications, particularly in renewable energy and environmentally friendly technologies.
Co-Authors Ahyar Ahmad Andriani, Ega Iis Intan Widiyowati Indah Raya Izzati, Zakiyah Ayu Noor Muhammad Zakir Paulina Taba Rasyid, Herlina Sari, Lovya Riska Sitti Habibah Sukemi Sukemi