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All Journal INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Jurnal Pengabdian kepada Masyarakat Nusantara Jurnal Teknologi Kimia Unimal Journal of Chemical Engineering Research Progress
Adriani, Siti
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Social Sciences Transportation

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Enhance Removal Pollutant from Batik Industrial Wastewater via Photo- Fenton Process: Efficiency and Kinetic Study Setiawan, Oki; Adriani, Siti; Manalu, Haposan Vincentius; Amalia, Aninditiya; Dewi, Ifti Luthviana; Kamil, Insan; Sari, Darti Purnama; Sasniati, Popi
Journal of Chemical Engineering Research Progress 2025: JCERP, Volume 2 Issue 2 Year 2025 (December)
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/jcerp.20467

Abstract

The present research evaluates the efficiency of the Photo-Fenton-like process under UV irradiation by varying ratio of hydrogen peroxide (H₂O₂) to Chemical Oxygen Demand (COD) and H₂O₂ to ferrous ion (Fe²⁺) using wastewater from a batik manufacturer in Gresik. Initial experiments demonstrated that varying the ratio of H2O2/COD contributes to Chemical Oxygen Demand (COD) removal, while maintaining a constant H2O2/Fe2+ ratio. The result reveals a significant effect on Chemical Oxygen Demand (COD) removal achieving 64.58% efficiency which indicates that highly reactive OH* radicals successfully generated in photo-Fenton-like process. Further optimization by increasing the ratio H2O2/COD = 15 (g/g) and H2O2/Fe2+ = 20 (g/g) resulting on maximum percentage of Chemical Oxygen Demand (COD) removal of 92.47% proving the massive production of OH* radicals. The kinetics reaction model which describes the Chemical Oxygen Demand (COD) degradation rate showed the BMG kinetic model, with parameters of 1/m = 0.9352, 1/b = 0.7159, and a coefficient of determination (R²) of 0.9986, indicating an excellent fit and high predictive accuracy of the kinetic model for this process. Copyright © 2025 by Authors, Published by Universitas Diponegoro and BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Utilizing Path Analysis to Examine the Influence of Internship Experiences and Work Information Mastery on VHS Students’ Work Readiness Sari, Darti Purnama; Kamil, Insan; Dewi, Ifti Luthviana; Setiawan, Oki; Manalu, Haposan Vincentius; Adriani, Siti; Sasniati, Popi
invotek Vol 25 No 2 (2025): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v25i2.1270

Abstract

This research investigates how internship experience and work information mastery influence vocational students’ work readiness, with work motivation acting as a mediating factor. The research population comprises all twelfth-grade students majoring in Mechanical Engineering at a Vocational High School in Yogyakarta, Indonesia, totaling 310 individuals. The maximum sample of 170 students was determined using Issac & Michael’s formula. The sample was selected through purposive sampling techniques, and data were collected using questionnaires, tests, and documentation. Descriptive statistical analysis was employed to summarize the characteristics of each variable, while hypothesis testing was conducted using path analysis in an ex-post facto research design. The results indicate that the proposed research model satisfies both validity and reliability tests, thus validating the suitability of the model. The findings reveal: (1) a significant indirect effect between internship experience and work readiness mediated by work motivation (t = 3.787, sig. 0.000), and (2) a significant indirect effect of work information mastery and work readiness through work motivation (t = 2.907, sig. 0.003). The results of the study indicate that internship experience and mastery of information through work motivation influence students' job readiness. The implication of this research is that schools need to increase collaboration with industry and strengthen the role of teachers, parents, and the Community Empowerment Agency (CEA) in providing information and guidance about the world of work, so that vocational high school graduates are better prepared and more easily accepted into the workforce.
Pelatihan Ecoprint di Desa Surowiti, Panceng, Gresik, Jawa Timur Setiawan, Oki; Pambudiarto, Benny Arif; Manalu, Haposan Vincentius; Dewi, Ifti Luthviana; Adriani, Siti; Sari, Darti Purnama; Kamil, Insan; Sasniati, Popi
Jurnal Pengabdian kepada Masyarakat Nusantara Vol. 6 No. 4 (2025): Edisi Oktober - Desember
Publisher : Lembaga Dongan Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55338/jpkmn.v6i4.7292

Abstract

Pelatihan Teknik ecoprint sebagai upaya pemberdayaan masyarakat di Desa Surowati Panceng, Kabupaten Gresik. Desa ini memiliki potensi alam melimpah yang belum dimanfaatkan secara optimal, sementara mayoritas ibu-ibu PKK adalah ibu rumah tangga usia produktif yang membutuhkan ketrampilan untuk meningkatkan perekonomian keluarga. Ecoprint, Teknik pewarnaan alami menggunakan tanaman yang mentransfer warna dan bentuk ke tekstil, dipilih karena memanfaatkan sumber daya local, ramah lingkungan, dan memiliki nilai ekonomis. Metode pelaksanaan meliputi analisis kebutuhan mitra, persiapan pelatihan, pemberian materi, dan praktik Teknik pounding pada tote bag. Hasil menunjukkan antusiasme tinggi dari pseserta meskipun terdapat kendala terkait kualitas alat pemukul yang beragam. Studi ini menunjukkan bahwa ecoprint berpotensi menjadi alternatif ekonomi kreatif berbasis kearifan local yang berkelanjutan, mendukung pengembangan ekonomi desa sekaligus melestarikan lingkungan. Teknik ini juga sejalan dengan tren fashion berkelanjutan yang semakin diminati konsumen. Pelatihan ini diharapkan meningkatkan keterampilan dan kesejahteraan masyarakat desa melalui pemanfaatan potensi alam sekitar.
Studi Kinetika Degradasi Polutan Didalam Limbah Cair Industri Sarung dengan Metode Fenton Setiawan, Oki; Dewi, Ifti Luthviana; Adriani, Siti; Sari, Darti Purnama; Manalu, Haposan Vincentius; Kamil, Insan
Jurnal Teknologi Kimia Unimal Vol. 14 No. 2 (2025): Jurnal Teknologi Kimia Unimal - November 2025
Publisher : Chemical Engineering Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/jtku.v14i2.22281

Abstract

Abstrak Limbah cair dari industri tekstil, khususnya sarung tenun, mengandung senyawa organik kompleks yang sulit diuraikan melalui proses biologis konvensional. Salah satu indikator pencemar utamanya adalah Chemical Oxygen Demand (COD) yang tinggi. Penelitian ini bertujuan untuk mengkaji efektivitas proses Fenton salah satu metode Advanced Oxidation Process (AOP) dalam menurunkan kadar COD pada limbah cair tekstil sarung serta memodelkan kinetika reaksi degradasinya. Proses Fenton melibatkan reaksi antara besi (Fe²⁺) dan hidrogen peroksida (H₂O₂) yang menghasilkan radikal hidroksil (•OH) sebagai oksidator kuat. Hasil penelitian menunjukkan bahwa rasio H₂O₂/COD sebesar 10 memberikan efisiensi degradasi COD tertinggi, mencapai 82,95% dalam waktu 60 menit pada pH 3. Analisis kinetika reaksi dilakukan menggunakan tiga model: orde satu, orde dua, dan Behnajady Modirshahla Ghanbery (BMG). Model BMG menunjukkan kecocokan terbaik dengan data eksperimental, dengan nilai koefisien determinasi (R²) sebesar 0,9932. Model ini juga menunjukkan bahwa kecepatan degradasi COD tinggi terjadi pada menit-menit awal, dan cenderung menurun seiring berkurangnya konsentrasi senyawa organik. Berdasarkan hasil tersebut, proses Fenton terbukti efektif dan potensial untuk diterapkan dalam pengolahan limbah cair tekstil dengan karakteristik beban COD tinggi. Penelitian ini memberikan dasar ilmiah bagi pengembangan teknologi AOP yang lebih efisien dan ramah lingkungan dalam skala industry.
Co-Authors Amalia, Aninditiya Dewi, Ifti Luthviana Kamil, Insan Manalu, Haposan Vincentius Pambudiarto, Benny Arif Sari, Darti Purnama Sasniati, Popi Setiawan, Oki