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All Journal INVOTEK: Jurnal Inovasi Vokasional dan Teknologi 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 Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology 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 (BKK) 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.
Co-Authors Amalia, Aninditiya Dewi, Ifti Luthviana Kamil, Insan Manalu, Haposan Vincentius Sari, Darti Purnama Sasniati, Popi Setiawan, Oki