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All Journal Jurnal Ilmu Lingkungan Jurnal Penelitian Pendidikan IPA (JPPIPA)
Afifah, Reny
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Environmental Science Materials Science & Nanotechnology Physics

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Optimalisasi Karbon Aktif Berbasis Bonggol Jagung untuk Pengelolaan Limbah Logam Berat Pb dan Mn Irawan, Nisya Indriyanti; Afifah, Reny; Nadira, Ainun; Suparno, Suparno
Jurnal Ilmu Lingkungan Vol 23, No 4 (2025): July 2025
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.23.4.1029-1036

Abstract

Pencemaran lingkungan oleh limbah logam berat, seperti timbal (Pb) dan mangan (Mn), merupakan isu krusial yang berdampak signifikan pada ekosistem dan kesehatan manusia. Untuk mengatasi masalah ini, penelitian ini bertujuan untuk mengoptimalkan pembuatan karbon aktif berbahan dasar bonggol jagung melalui variasi jenis aktivator (asam sulfat, H₂SO₄, dan kalium hidroksida, KOH) dan konsentrasi (1M, 2M, 3M) guna meningkatkan efisiensi adsorpsi Pb dan Mn. Bonggol jagung dikarbonisasi menggunakan metode pembakaran tertutup (teknik Earth pit-kiln) dan selanjutnya diaktivasi dengan larutan aktivator tersebut. Karakteristik karbon aktif yang dihasilkan dianalisis berdasarkan kadar air, kadar abu, dan efisiensi adsorpsi menggunakan spektrofotometer serapan atom (SSA). Hasil penelitian menunjukkan bahwa karbon aktif yang diaktivasi dengan KOH memiliki kadar air lebih rendah dan efisiensi adsorpsi yang lebih tinggi dibandingkan dengan H₂SO₄, terutama untuk Mn yang lebih sulit diadsorpsi. Karbon aktif dengan konsentrasi KOH 2M menunjukkan performa terbaik, mencapai efisiensi adsorpsi Pb sebesar 96,93% dan Mn sebesar 98,41%. Studi ini menyimpulkan bahwa aktivasi basa menggunakan KOH menghasilkan karbon aktif dengan kualitas dan efisiensi adsorpsi yang lebih unggul dibandingkan aktivasi asam menggunakan H₂SO₄ untuk penanganan limbah Pb dan Mn.
A Bibliometric Analysis of Problem-Solving Skill and STEM Integration in Education (Scopus Database 2004-2024) Afifah, Reny; Kuswanto, Heru; BN, Ayu Mar’ati
Jurnal Penelitian Pendidikan IPA Vol 11 No 2 (2025): February
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i2.9432

Abstract

Problem solving and STEM integration in education are important in many countries around the world. Problem solving and STEM integration in education can also be applied at various levels. This study aims to describe the development trends of research in the topic, as well as to identify the most relevant and widely cited countries, sources and topics in the related literature. Previous studies have shown that problem solving and STEM integration are mostly applied in secondary schools. In this study, we extracted from the Scopus database to analyze and evaluate the results of scientific publications related to problem solving and STEM integration in education during 2004-2024. The number of publication data that has been filtered is 106 publications, all of which are taken from the Scopus database. The results of the quantitative analysis show that research on problem solving and STEM integration in education has grown rapidly in the last 5 years. The most relevant and most cited country is the USA. Meanwhile, the most relevant source is CBE Life Sciences Education. The research topics are also quite diverse, focusing on several issues: engineering, education, humanism, professional aspect, etc. This research has limitations, because the publication data we analyzed was only data from Scopus and the analysis we used used VOSviewer and biblioshiny.
Co-Authors BN, Ayu Mar’ati Heru Kuswanto Irawan, Nisya Indriyanti NADIRA, AINUN Suparno Suparno