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All Journal Jurnal Pendidikan Kimia Indonesia Lantanida Journal JKPK (Jurnal Kimia dan Pendidikan Kimia) KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia Jurnal Kajian Pendidikan IPA Bulletin of Chemical Reaction Engineering & Catalysis al Kimiya : Jurnal Ilmu Kimia dan Terapan
Sunarya, Risa Rahmawati
Department Of Chemistry Education, UIN Sunan Gunung Djati Bandung
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Social Sciences

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Preparation of Polyaniline Emeraldine Salt for Conducting-Polymer-Activated Counter Electrode in Dye Sensitized Solar Cell (DSSC) using Rapid-Mixing Polymerization at Various Temperature Auliya Nur Amalina; Veinardi Suendo; Muhammad Reza; Phutri Milana; Risa Rahmawati Sunarya; Damar Rastri Adhika; Viny Veronika Tanuwijaya
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (December 2019)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.14.3.3854.521-528

Abstract

Polyaniline Emeraldine Salt (PANI ES) as a conductive polymer has been used as a Pt-free counter electrode materials in DSSC. In this study, polymerization temperature was varied at relatively high temperature from 308 to 348 K with respect to the standard low polymerization temperature at 273 K. The synthesis held in varied high-temperature to study the effect of synthesis condition resulted to the performance as counter electrode in DSSC. The effect of high-temperature synthesis condition gives interesting results, the FTIR-ATR spectra show the presence of vibrational modes of phenazine structure obtained at high polymerization temperature, indicate the changing in the chain geometry. Raman Spectroscopy shows the decrease of the I1194/I1623 intensity ratio that can be interpreted that the degree-of-freedom of C-H bond bending mode decreases in the benzenoid ring, while the stretching mode degree-of-freedom along the chain is preserved or increased. The electrical conductivity profile has changed from metal-like at low-temperature into a semiconductor-like profile at high-temperature. Scanning Electron Microscope images reveals that a change in the morphology of PANI ES with temperature. At low-temperature (273 K) the morphology has a globular shape, while at high-temperature it tends to form nanorod structure. DSSC device with highest efficiency is attained for PANI ES polymerized at 273 K (1.91%) due to its high conductivity. The lowest efficiency is observed in device using PANI ES synthesized at 328 K (1.15%) due to its low conductivity due to the formation of phenazine structure. 
Implementation of Problem Solving-Based Electron Configuration E-Modules to Improve Student Learning Outcomes Sunarya, Risa Rahmawati; Hijriansyah, Reza; Aisyah, Riri
Jurnal Pendidikan Kimia Indonesia Vol. 8 No. 1 (2024)
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jpki.v8i1.70029

Abstract

This research aims to analyze the improvement in student learning outcomes in the application of the problem-solving-based electron configuration e-module. The true-experiment method with a pretest-posttest design was used in this research so that learning outcomes from the control class and the experimental class could be compared. The research results show that during the process of implementing the e-module, student activities went very well. At the stages of analyzing problems, making hypotheses, collecting data, testing hypotheses, and making conclusions respectively, students got an average score of 84.25; 82.5; 80.5; 100; and 89.5. The statistical test of student learning outcomes in the control class and experimental class using the Mann-Withney U test shows a significance value of 0.013 so it can be concluded that there is a significant difference between student learning outcomes with the application of e-modules and without the application of e-modules in learning.
Synthesis and Characterization of Polyaniline/CuO Nanocomposites with Various Temperature Sunarya, Risa Rahmawati; Sidik, Yosi Yosiva; Islamiati, Fitri Nur
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 2 (2024): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v9i2.90819

Abstract

Polyaniline (PANI) metal oxide composites are known for their high electrical conductivity, environmental stability, and enhanced mechanical strength, making them valuable in applications such as sensors, batteries, and electromagnetic shielding. This study focuses on synthesizing and characterizing PANI/CuO nanocomposites to examine their structural, morphological, and functional properties at different synthesis temperatures. By integrating the conductive polymer PANI with copper oxide (CuO), a p-type semiconductor with a narrow band gap, the material’s capabilities are significantly enhanced. The oxidative polymerization of aniline, the process by which PANI is formed, requires precise control of oxidizing agents and reaction conditions, as these factors directly affect the polymerization, conductivity, and overall properties of the resulting nanocomposite. The PANI/CuO nanocomposites were synthesized at three different temperatures: 10℃, 25℃, and 50℃, to determine how temperature affects their characteristics. Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM) were employed to analyze these nanocomposites. FTIR results revealed shifts in the quinoid and benzenoid rings, indicating hydrogen bonding between the NH group of PANI and the CuO surface, which accelerates charge transfer. The SEM analysis showed that while pure PANI exhibits a uniform globular morphology, the PANI/CuO nanocomposites display a nanorod morphology. These morphological differences impact the surface area and electrical conductivity of the composites, highlighting the significance of temperature in tailoring the material's properties for specific applications.
The Effect of pH and Temperature on The Stability of Anthocyanins from Black Soybean Skin Extracts Sunarya, Risa Rahmawati; Subarkah, Cucu Zenab; Purliantoro, Dwi; Taskinih, Taskinih; Islamiati, Fitri Nur
al Kimiya: Jurnal Ilmu Kimia dan Terapan Vol 11, No 1 (2024): al Kimiya: Jurnal Ilmu Kimia dan Terapan
Publisher : Department of Chemistry, Faculty of Science and Technology, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/ak.v11i1.35861

Abstract

Anthocyanins are natural dyes of purple and red. Anthocyanin dyes are applied in various industries as a drink or food coloring. As natural dyes, anthocyanins have an important role in human health. This research aimed to analyze the stability of anthocyanins from black soybean skin extract at varying pH and temperature. Anthocyanins from black soybean skins are macerated using two kinds of solvents. The solvents are distilled water + 30% citric acid and 70% ethanol + 1% HCl. Maceration was carried out at a temperature of 4℃. Then the anthocyanin was treated at a temperature range of 40-90℃ and pH of 5-9 and its absorbance was measured using UV-Vis’s spectrometry. The concentration of anthocyanin from black soybean skins is from the solvent distilled water + 30% citric acid of 1.992 mg/L, while from the solvent 70% ethanol + 1% HCl it was 1.936 mg/L. The color stability temperature t of black soybean skin extract was carried out at temperatures of 40°C, 50°C, 60°C, 70°C, 80°C, and 90°C. with respective absorbance of 0.274; 0.247; 0.237; 0.227; and 0.214. The higher the temperature, the anthocyanin content decreases. pH test was carried out at pH 5, 6, 7, 8, and 9 with respective absorbance values of 1.831; 1,759; 1,229; 1,118; and 1,066. The pH test showed that the higher the pH, the anthocyanin content was reduced, while the application of additional anthocyanin to white agar as food coloring showed that the anthocyanin content was only 0.125. It can be concluded that anthocyanins have good stability at low temperatures and acidic pH.
SOCIOSCIENTIFIC ISSUES AS A PEDAGOGICAL APPROACH TO FOSTER SCIENTIFIC ARGUMENTATION IN BIOPLASTIC PRODUCTION USING SUGARCANE BAGASSE Salsafitri, Medina Fasya; Sunarya, Risa Rahmawati; Helsy, Imelda; Dahriah, Iis
Lantanida Journal Vol 13 No 1 (2025): January-June 2025
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/0jje1904

Abstract

This study aims to develop students’ scientific argumentation through the implementation of socioscientific issues-based learning in the production of bioplastics from sugarcane bagasse (Saccharum officinarum). The method employed is pre-experimental with a one-shot case study design. The research subjects consisted of 36 eleventh-grade students from the Industrial Chemistry program at a vocational high school (SMK) in Cimahi City. The research instruments included student activity observation sheets, student worksheets, argumentation debates, and scientific argumentation tests. Students’ activities during the learning process showed excellent results, with an average score of 94. Meanwhile, their ability to complete the student worksheets achieved an average score of 98, both falling into the “very good” category. The majority of students’ oral argumentation was at level 2, which includes a claim supported by evidence without rebuttal. In contrast, the development of students’ written scientific argumentation after the implementation of socioscientific issues was at quality level 3, characterized by arguments that include weak rebuttals. These findings indicate that socioscientific issues-based learning can be effective in developing students’ scientific argumentation, although further instruction is needed to enhance students’ ability to present stronger, evidence-based rebuttals.
THE IMPLEMENTATION OF PROJECT-BASED WORKSHEETS TO DEVELOP STUDENTS’ SCIENTIFIC PERFORMANCE THROUGH EDIBLE FILM PRODUCTION Khoirunnisa, Kuntum Salsabilla; Sunarya, Risa Rahmawati; Sukmawardani, Yulia; Sari, Sari
KATALIS: Jurnal Penelitian Kimia dan Pendidikan Kimia Vol 8 No 1 (2025): Jurnal Katalis Vol. 8 No. 1 Tahun 2025
Publisher : Universitas Samudra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33059/katalis.v8i1.11836

Abstract

The low scientific performance of students in learning chemistry is one of the main problems in education, mainly because the learning approach is still dominated by conventional methods and teacher-centered. Learning that does not actively involve students can hinder the development of critical thinking skills, problem solving, and students' scientific performance abilities. This study aims to develop students' scientific performance through the application of project-based worksheets in making edible film from jackfruit seed waste (Artocarpus heterophyllus). The research used a quantitative approach through the application of pre-experimental methods with a one-shot case study design involving 34 students of class XI majoring in Industrial Chemistry at one of the vocational high schools (SMK) in Cimahi City. The research instruments consisted of student activity observation sheets, project-based worksheets, and scientific performance assessment sheets. The results showed that student activity during learning obtained an average score of 97, worksheet work achieved an average score of 94, and student scientific performance of 92, each categorized as very good. These findings prove that the use of project-based worksheets can develop students' activeness, independence, and scientific abilities, and become an alternative solution to the problem of passive science learning in schools.
Development of a Guided Inquiry-Based Experimental Design for the Synthesis of GO-PANI from Coconut Shell Charcoal Nurfadilah, Lutfina; Sunarya, Risa Rahmawati; Nurhayati; Irwansyah, Ferli Septi; Sari, Sari
Jurnal Kajian Pendidikan IPA Vol 5 No 2 (2025): Jurnal Kajian Pendidikan IPA
Publisher : Universitas Garut

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52434/jkpi.v5i2.42652

Abstract

This study aims to develop an experimental design based on guided inquiry for the synthesis of GO–PANI composites derived from coconut shell charcoal, packaged in a Student Worksheet. The development follows the Research and Development (R&D) model, consisting of three main stages: preliminary study, research, and instructional material development. Preliminary studies analyze the needs through syllabus and journals.  The study was in the form of a preliminary test in the laboratory in the synthesis of graphic oxide (GO) with a modified Hummers method, then composed with polyanilin through in situ polymerization.  Development of teaching devices in the form of experimental and student worksheet designs. The student worksheet was structured according to guided inquiry phases: orientation to the problem, problem formulation, planning and conducting experiments, data analysis, and drawing conclusions. Validation by three experts indicated that the experimental design and student worksheet were rated highly valid, with an average r value of 0.94. A feasibility test involving ten students showed very positive responses, with an average feasibility score of 92.2%. The success of the experimental design is reflected in its ability to integrate locally sourced biomass-based material synthesis with a contextual and applicable guided inquiry approach. In addition, characterization of the synthesized products using FTIR and SEM confirmed the successful formation of the GO–PANI composite. This research contributes to the development of instructional tools relevant to modern chemistry education while supporting the principles of renewable energy and the sustainable utilization of local resources. Keywords: Coconut shell charcoal, Experimental design, GO-PANI, Guided inquiry, Student worksheet.
Co-Authors Auliya Nur Amalina Cucu Zenab Subarkah, Cucu Zenab Dahriah, Iis Damar Rastri Adhika Dwi Purliantoro Hijriansyah, Reza Imelda Helsy, Imelda Islamiati, Fitri Nur Khoirunnisa, Kuntum Salsabilla Muhammad Reza Nurfadilah, Lutfina Nurhayati Phutri Milana Ratnasari Ratnasari Riri Aisyah, Riri Salsafitri, Medina Fasya Sidik, Yosi Yosiva Taskinih, Taskinih Veinardi Suendo Viny Veronika Tanuwijaya Yulia Sukmawardani, Yulia