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All Journal Abdi Dosen : Jurnal Pengabdian Pada Masyarakat Panrannuangku Jurnal Pengabdian Masyarakat Journal of Education Research Jurnal Akademika Kimia JIPI (Jurnal IPA dan Pembelajaran IPA) Jurnal Akademika Kimia
Yuli Nurmayanti
Universitas Tadulako
Religion Humanities Biochemistry, Genetics & Molecular Biology Chemistry Education Engineering Environmental Science Health Professions Library & Information Science Mathematics Physics Public Health Social Sciences

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Utilization of Black Tea Dregs as an Adsorbent of Metal Fe in Water using UV-Vis Spectrophotometry safitri, sauli; Aminah, Sitti; Nurmayanti, Yuli; Rahmawati, Sitti; Santoso, Tri
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp187-193

Abstract

Tea dregs are household organic waste materials that can be utilized as low-cost adsorbents for heavy metal removal. Previous studies mainly employed green tea dregs and focused on Cu(II) adsorption, while studies on Fe(III) adsorption using black tea dregs and their direct application to Fe-contaminated water remain limited. This study evaluates the adsorption performance of black tea dregs toward Fe(III) ions and their application in water samples. Batch adsorption experiments were conducted using FeCl₃ solutions at pH 4.8 to determine the optimum contact time (15–90 minutes) and initial concentration (100–300 ppm). Fe(III) concentrations were analyzed using UV–Vis spectrophotometry. The results demonstrated an optimal contact time of 60 min and an optimal concentration, achieving 99.26% adsorption efficiency. Adsorption followed the Langmuir isotherm model with a maximum capacity of 37.04 mg/g (R² = 0.998). Application to well water samples resulted in 83.74% Fe removal, confirming the potential of black tea dregs as adsorbents.
Effectiveness of Problem-Based Learning with Dr Stone Animation on Grade XI Students’ Acid-Base Learning Outcomes Jannah, Miftahul; Tiwow, Vanny M. A.; Abram, Paulus H.; Nurmayanti, Yuli
Jurnal Akademika Kimia Vol. 14 No. 3 (2025)
Publisher : Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/j24775185.2025.v14.i3.pp181-186

Abstract

The background of this research is low student performance in the topic and the need for an innovative, interactive, and contextual learning approach. This study aims to examine the effectiveness of the Problem-Based Learning (PBL) model using Dr Stone's animation media on students' learning outcomes in the acid-base topic for Grade XI students at SMA Negeri 1 Sirenja. The problem addressed in this research relates to how to improve student learning outcomes and engagement through the integration of contextual and technology-based media. The research employed a pre-experimental design with a one-group pre-test and post-test on a single experimental class consisting of 30 students. The instruments used included Lesson Plans (RPP), Student Worksheets (LKPD), Dr Stone animation media, and a multiple-choice learning outcome test consisting of 15 validated questions, reviewed and approved by expert validators. The validation results showed that all instruments were valid and appropriate for use. Student learning outcomes were analysed using the N-Gain score to measure the improvement after learning. The average N-Gain score was 0.7331 (73.31%), placing it in the moderately effective category. The average difference between pre-test and post-test scores was 37.10 points, indicating a significant improvement in student learning outcomes. Most students experienced substantial learning gains after participating in problem-based learning supported by animation media. This study demonstrates that combining the Problem-Based Learning (PBL) model with Dr Stone's animation media effectively improves student learning outcomes. Furthermore, this study supports the learning process by incorporating a contextual and interactive approach that fosters students’ motivation, deepens their conceptual understanding, and promotes active involvement in chemistry lessons. It also offers valuable guidance for teachers on applying technology-integrated, student-centred teaching strategies in science education.
Pembuatan Biochar dari Cangkang Pinang sebagai Adsorben Logam Kadmium (Cd) Robert Tolly; Daud Karel Walanda; Mery Napitupulu; Yuli Nurmayanti
Journal of Education Research Vol. 7 No. 2 (2026)
Publisher : Perkumpulan Pengelola Jurnal PAUD Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37985/jer.v7i2.3789

Abstract

Pencemaran logam berat, khususnya kadmium (Cd), merupakan masalah lingkungan yang serius karena bersifat toksik, persisten, dan dapat terakumulasi dalam rantai makanan. Penelitian ini bertujuan untuk mengevaluasi kemampuan biochar cangkang pinang (Areca catechu L.) sebagai adsorben ion Cd²⁺ serta menentukan kondisi optimum adsorpsi menggunakan metode Taguchi. Biochar dibuat melalui proses pirolisis dan digunakan untuk mengadsorpsi Cd dengan variasi massa biochar, pH larutan, dan konsentrasi awal Cd. Metode Taguchi diterapkan untuk menganalisis pengaruh parameter dan menentukan kondisi optimum berdasarkan rasio Signal-to-Noise (S/N). Hasil penelitian menunjukkan bahwa biochar cangkang pinang mampu mengadsorpsi Cd secara efektif dengan efisiensi adsorpsi maksimum sebesar 96,98% dan kapasitas adsorpsi 11,64 mg/g pada pH 3, massa biochar 0,25 g, dan konsentrasi awal Cd 100 ppm. Optimasi Taguchi menghasilkan kondisi terbaik pada massa biochar 1,00 g, pH 4, dan konsentrasi awal 50 ppm. Hasil ini menunjukkan bahwa biochar cangkang pinang berpotensi sebagai adsorben ramah lingkungan untuk pengolahan limbah yang mengandung Cd.
Co-Authors AA Sudharmawan, AA Abram, Hengky P. Abram, Paulus H. Afadil Agustin Tiwow Anang Wahid M.Diah Bolang, Pinkan K. Daud Karel Walanda Detris Poba Griffiths, Zoe Gustina Gustina H.Mailili, Wahyuni Hamzah, Abdul Irmawati Irmawati Irwan Irwan Istiqomah, Almia Meida E. Marpaung Mery Napitupulu Miftahul Jannah Nakazawa, Koyomi Napitupulu*, Mery Poba, Detris Rahma, Sri Robert Tolly Safitri, Sauli Siti Nuryanti Sitti Aminah Sitti Rahmawati Tiwow, Vanny M A Tri Santoso