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Tri Santoso
Fakultas Pertanian Universitas Muhammadiyah Purworejo
Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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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.
The Effect of the Lottery Card Method on Discovery Learning Assisted by Video Learning Media on Student Learning Outcomes Azizah, Nur; Santoso, Tri; Ahmar, Dewi Satria; Magfirah, Magfirah; Marpaung, Meida Esterlina
Journal of General Education and Humanities Vol. 5 No. 1 (2026): February
Publisher : MASI Mandiri Edukasi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58421/gehu.v5i1.975

Abstract

This study aims to describe the effect of the lottery card method on student learning outcomes in acid-base solution material during video-assisted discovery learning. This study used a pre-test and post-test control group design. The study population consisted of all 247 ninth-grade students at SMA Negeri 5 Palu, across eight classes.  Two classes were selected as samples, namely class XI Merdeka 5 (control) and class XI Merdeka 6 (experimental), each with the same number of 34 students, using simple random sampling. Data were collected using pre-tests and post-tests. The control class used only the discovery learning model, while the experimental class used the lottery card method in video-assisted discovery learning. From the analysis results, the N-ngai score for the control class was 0.49, and for the experimental class was 0.67, both of which were classified as moderate. Although both were moderate, the N-ngai score for the experimental class was higher than that for the control class. The t-test results showed a significance value of 0.001, which is less than 0.05, so it can be concluded that Ho is rejected and Ha is accepted. Therefore, it can be said that the lottery card method in discovery learning assisted by video media has an effect on student learning outcomes in acid-base solution material.
Co-Authors - STMIK Nusa Mandiri, Adelia Alvi Yana ., Syahriani Aceng Haetami, Aceng Afadil Ahmar, Dewi S. Alimuddin, Chatifah Aminah , Sitti Andi Sanjaya Ardian Dwi Praba Astrilyana - Universitas Bina Sarana Informatika Atiqa Sabardila Bachtiar, Dimas Agung Bambang Wijonarko Bilqis Salsabila S, Safa C. Morokuhi, Yulina Dewi Satria Ahmar Dewi Susilowati Dicky Sulaeman, Dicky Esterlina Marpaung, Meida Frisma Handayanna Hamzah, Abdul Handayani, Popon Hartati, H Harun Joko Prayitno Hasrudin, Hasrudin K. Walanda, Daud Kurniadi, Win Kusmanto, Hari Kusuma, Meydika Triyan Lukito Dwi Yuono, Lukito Dwi Magfirah Magfirah, Magfirah Marpaung, Meida E. Maryanah Safitri Miftakhul Huda Mufida Muh Ihsanudin, Muh Nur Azizah Nursafitri, Nursafitri Omar Pahlevi Poba, Detris Prisscilya, Veren Pulukadang, Sri H. V. Pulukambang, Sri H. V. Purnama Ningsih Ramadhani, Anjas Raodatul Jannah Ratnawati Ratnawati Riyandi, Albert S. Ahmar, Dewi Safitri, Sauli Saputro, Duwi Siti Aminah Siti Fatimah Sitti Aminah Sitti Rahmawati Sri Hastuti Virgianti Pulukadang Sufia, Sufia Suherman Suherman, Suherman Sukmawati Sukmawati Supriadi Supriadi Suryasa, Raden Bagus SW, Sulistianto Syahriani Syahriani Syahriani, Syahriani Tukaedja, Sindi Velesia Utami, Nindy Muji Wibowo, Imam WINARSIH Yakub Nasucha Yuli Nurmayanti Zefanya, Gifty Mathilda Zulhan, Zulhan