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All Journal The Journal of Pure and Applied Chemistry Research PAEDAGOGIA
Rizka Fauzia Hanif
Universitas Sebelas Maret
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Medicine & Pharmacology

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Utilization of Mendong Plants-Activated Charcoal as H2S and NO2 Gas Adsorbent: Preliminary Study Sulistyo Saputro; Rizka Fauzia Hanif; Inung Widyastuti; Lina Mahardiani
The Journal of Pure and Applied Chemistry Research Vol 10, No 1 (2021): Edition January-April 2021
Publisher : Chemistry Department, The University of Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jpacr.2021.010.01.525

Abstract

The study of exhaust H2S and NO2 gases using activated carbon has been conducted. In this study, activated carbon was prepared from mendong plant (Frimbistylis umbellaris), which was activated using zinc chloride (ZnCl2) with concentrations of 2.5; 5; 7.5; and 10 % w/v to determine the efficiency of H2S adsorption. Mendong charcoal was obtained from the process of using a modified tool. Activation was done by maceration using ZnCl2 activator (w/v) for 24 hours. The adsorption of H2S and NO2 was analyzed using UV-Vis spectrophotometry. Determinations of H2S gas carried out using the blue methylene’s method for 1 hour showed the highest effectiveness of mendong activated carbon was of that at the concentration of 2.5 % ZnCl2 w/v with 80% of H2S removal. Further, the mendong activated carbon with the concentration of 2.5% ZnCl2 w/v was used for NO2 adsorption. The adsorption of NO2 gas was conducted for 1 hour using Griess Saltzman’s method. The result showed that the largest concentration of NO2 gas was adsorbed when the HNO3 concentration was 1.5 M (0.057 µg/mL). The percentage of NO2 efficiency adsorbed was at 28%.
Exploring Learning Needs for Developing a STEAM-Oriented Differentiated Virtual Laboratory in Electroplating and Electropolishing Rizka Fauzia Hanif; Sri Mulyani; Suryadi Budi Utomo
PAEDAGOGIA Vol 29, No 1 (2026): PAEDAGOGIA Jilid 29 No 1 (2026)
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/paedagogia.v29i1.112931

Abstract

This study aims to explore the need for virtual laboratory media (V-Lab) that integrates differentiated learning using the STEAM approach for electroplating and electropolishing. The research method used is qualitative-descriptive, with the research subjects comprising 3 teachers and 75 students from two public senior high schools and one vocational high school in Metro City, Lampung. Data collection used questionnaires, learning observations, and interviews. The results of the observations show that chemistry learning is still dominated by lectures and exercises (40%), while limited equipment, materials, and costs, as well as the risk of hazardous waste, continue to limit practical activities. Students experience significant difficulties in visualizing sub-microscopic phenomena, especially in determining ion flow (74%) and reactions at the anode-cathode (62%), resulting in a low ability to calculate Faraday's Law (60%). Cognitive data analysis shows a diversity of student abilities, with the majority being at the "need guidance" level (41%). These findings underscore the need for innovative learning media, with 100% of teachers and 77% of students agreeing with the development of V-Lab integrated with differentiated learning and the STEAM approach. V-Labs are expected to transform abstract concepts into concrete ones, increase motivation, and accelerate the learning pace of diverse students without the physical risks of a laboratory setting.
Co-Authors Inung Widyastuti Lina Mahardiani Mulyani, Sri Sulistyo Saputro Suryadi Budi Utomo