Oktaviani, Sukmaningrum Latifah
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Metal Oxide for Fast Adsorption System in the Methylene Blue Removal Ulfa, Maria; Oktaviani, Sukmaningrum Latifah; Mulyani, Bakti; Sholeha, Novia Amalia
Indonesian Journal of Chemistry Vol 25, No 2 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.92617

Abstract

Rapid adsorption systems utilizing metal oxide-based materials represent a promising technology to address adsorption challenges, particularly for the effective removal of methylene blue (MB). These systems enhance the continuous MB elimination process by leveraging metal oxide (MO)-based adsorbents with high accessibility and optimized adsorption conditions. The preparation process involves selecting metal oxides with high surface area and strong adsorbate affinity, ensuring efficient interaction with MB. Process parameters such as adsorbent dosage, contact time, temperature, pH, initial concentration, waste volume, and pressure are modified to develop a rapid and sustainable system for MB removal. This configuration enables efficient application in water treatment, achieving faster and more effective MB degradation. Moreover, the scalability of MO-based adsorbents ensures low-cost production and broad applicability, further supporting sustainable waste management. This review critically evaluates experimental findings from various studies on MO-based materials in rapid adsorption systems, highlighting their potential for large-scale implementation in wastewater treatment to mitigate environmental pollution.
Developing an Ethnoscience-Based AKM instrument: Evidence of Content Validity and Item Quality Oktaviani, Sukmaningrum Latifah; Yamtinah, Sri; Hastuti, Budi
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.v29i1.115663

Abstract

This study uses a descriptive quantitative approach that aims to describe and analyze the quality of Minimum Competency Assessment (AKM) questions developed in integrated ethnoscience learning with a focus on scientific literacy and numeracy literacy in the topic of salt hydrolysis. There are various question formats, namely multiple choice, complex multiple choice, matching, short answer (fill in the blank), and true-false. The item quality analysis in this study involved: difficulty level testing, discrimination power testing, and instrument reliability testing. The difficulty level testing was conducted to determine the proportion of students who were able to answer each item correctly. The discrimination power testing aimed to determine the ability of each item to distinguish between high-ability and low-ability students. Meanwhile, the reliability testing was conducted to assess the overall internal consistency of the test instrument in measuring students' scientific literacy and numeracy skills.The variety of question formats is designed to accommodate the characteristics of AKM which emphasizes higher-order thinking skills, conceptual understanding, and the application of knowledge in the context of everyday life based on ethnoscience.The analysis results show that the majority of test items fall into the moderate difficulty category, indicating that they are neither too easy nor too difficult for students. Furthermore, the discriminatory power of the test items is in the good category, meaning each item effectively differentiates students with different ability levels. High instrument reliability indicates that the test instrument has good consistency and can provide stable and reliable measurement results.