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All Journal Al Ishlah Jurnal Pendidikan Indonesian Journal of Chemistry International Journal of Pedagogy and Teacher Education JKPK (Jurnal Kimia dan Pendidikan Kimia)
Wirawan Ciptonugroho
Chemistry Education Study Program, Faculty Of Teacher Training And Education, Universitas Sebelas Maret
Chemical Engineering, Chemistry & Bioengineering Chemistry Education Languange, Linguistic, Communication & Media Mathematics Social Sciences Other

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Flocculation Performance of Industrial Sugarcane Juice by Acrylamide-Based Anionic Flocculant Eva Oktavia Ningrum; Agung Subyakto; Wirawan Ciptonugroho; Shania Lorensa; Devianti Anggraini Ramadhani; Agus Surono
Indonesian Journal of Chemistry Vol 23, No 1 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.73150

Abstract

Despite the widespread use of ionic polymer flocculants in sugar refineries, there is still insufficient knowledge on the relationship between the polymer properties and the efficiency of flocculation. This paper describes the performance of poly(sodium acrylate-co-acrylamide) (poly(SA-co-AAm)) as an anionic flocculant in the flocculation–coagulation of sugarcane juice from the sugar factory Gempolkrep PTPN X Mojokerto. Poly(SA-co-AAm) was successfully prepared via free radical polymerization of sodium acrylate and acrylamide with respective molar ratios of 40:60, 50:50, and 60:40, and compared with the commercial flocculant Accofloc. It was found that the mud height of the sugarcane decreased with increasing SA:AAm ratio. However, mud height increase was observed with further increasing SA:AAm ratio. Furthermore, increasing the flocculant dosage did not induce any significant change in the mud height and pH. The total dissolved solids (TDS) significantly decreased when the ratio of sodium acrylate:acrylamide was changed from 40:60 to 50:50, whereas a further change to 60:40 increased the TDS value again. It is also noticed that the tendency of turbidity is consistent with the TDS value. These results demonstrate that poly(SA-co-AAm) is a feasible alternative to the commercial flocculant owing to its good flocculation–coagulation performance with an optimum SA:AAm ratio of 50:50.
Boosting Critical Thinking Skills: Applying the Dilemma Stories Approach with the 5E Learning Cycle in Buffer Subject Education Anisa Ayu Solikah; Sulistyo Saputro; Sri Mulyani; Lina Mahardiani; Endang Susilowati; Nanik Dwi Nurhayati; Budi Hastuti; Wirawan Ciptonugroho
AL-ISHLAH: Jurnal Pendidikan Vol 16, No 2 (2024): AL-ISHLAH: JURNAL PENDIDIKAN
Publisher : STAI Hubbulwathan Duri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35445/alishlah.v16i2.4556

Abstract

This study explores the impact of the Dilemmas approach, rooted in transformative learning, on enhancing critical thinking skills in buffer chemistry subjects among high school students. Employing a mixed-methods design and purposive sampling, the research involved 34 eleventh-grade students from SMAN 1 Surakarta. The implementation of dilemma stories integrated with a 5E learning cycle was scrutinized using various data collection methods, including observations, student reflective journals, pretest-posttest assessments, the Constructivist Chemistry Values Learning Environment Survey (CCVLES), and interviews. Observations assessed the application of the dilemma stories and the 5E learning cycle. Pretest-posttest evaluations measured changes in students' critical thinking abilities, while reflective journals and CCVLES questionnaires captured students' perceptions of their critical thinking skills and their learning experiences. Interviews were conducted to validate the findings from the tests, journals, and questionnaires. Data analysis involved reduction, display, and conclusion-drawing techniques. The findings suggest that the Dilemmas approach significantly fosters students' ability to think critically and apply chemical concepts practically. This was evidenced by students' analyses of dilemma stories and responses in interviews, CCVLES questionnaires, and reflective journals, indicating a deeper engagement with and understanding of the subject matter through this innovative learning strategy.
The Impact of the Common Knowledge Construction Model (CKCM) Integrated with Ethnoscience and Podcasts on Science Process Skills in the Topic of Chemical Bonding Viki Nurlatifah; Mohammad Masykuri; Wirawan Ciptonugroho; Sri Yamtinah; Maria Ulfa; Bakti Mulyani; Agung Nugroho Catur Saputro; Ari Syahidul Shidiq
International Journal of Pedagogy and Teacher Education Vol 8, No 1 (2024): International Journal of Pedagogy and Teacher Education - April
Publisher : The Faculty of Teacher Training and Education (FKIP), Universitas Sebelas Maret, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/ijpte.v8i1.87665

Abstract

Technological advances and competition in the 21st-century demand that students enhance their knowledge and skills. The Common Knowledge Construction Model (CKCM) can effectively influence students' academic skills and achievements in chemistry. This study examined the impact of CKCM integrated with ethnoscience and podcasts on improving science process skills and student learning outcomes. A quasi-experimental design with cluster random sampling was employed to select experimental and control groups from the population of specialization 11th-grade science program  (five classes) in a senior high school in Boyolali Regency. Multiple-choice questions were used to measure science process skills and learning outcomes. Descriptive analysis and hypothesis testing were conducted using the Kruskal-Wallis test. The results revealed a significance value of 0.000 in both hypothesis tests for science process skills and learning outcomes. A significance value of less than 0.05 indicates that the application of CKCM positively impacts both variables. Integrating ethnoscience provides a deeper understanding by building culturally contextualized logical thinking. Supported by podcast media, it creates a dynamic and engaging learning environment that helps students actively construct their knowledge. This research contributes to developing the CKCM learning model mediated by podcasts to empower chemistry knowledge and science process skills, preparing students to meet the challenges of the 21st century.
Modification of Polyethylene Glycol and Citric Acid on Palm Fiber Waste Nanofibers on the Adsorption of Violet Crystal Dyes Lina Mahardiani; Nida Damayanti; Rizki Deva Maharani; Sulistyo Saputro; Endang Susilowati; Wirawan Ciptonugroho; Nanik Dwi Nurhayati
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 3 (2023): 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.v8i3.80105

Abstract

This study developed nanofibers derived from sugar palm fiber waste, incorporating citric acid and polyethylene glycol (PEG) modifications to adsorb crystal violet (CV) dye. The synthesis process involved alkalization-acid hydrolysis and bleaching techniques. Subsequent analyses of nanofiber characteristics were conducted using Fourier-Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Scanning Electron Microscopy-Energy Dispersive X-ray (SEM-EDX). The efficacy of these modified nanofibers in adsorbing CV was quantitatively measured using an Ultraviolet-Visible (UV-Vis) spectrophotometer. The study successfully synthesized nanofibers from sugar palm fiber waste with modifications: PEG-modified nanofibers (NP 2 and NP 24) and citric acid-modified nanofibers (NS 2 and NS 24). These modifications resulted in nanofibers with a smooth, white texture. FTIR analysis of the samples (N, NP 2, NP 24, NS 2, and NS 24) revealed the presence of functional groups essential for cellulose, specifically -OH, C-H, and C-O groups. The addition of citric acid introduced a new group, C=O, albeit with very weak intensity. PEG modifications were evident from the stretching observed in the -OH groups. SEM analysis confirmed the presence of a layer on the nanofibers, attributed to citric acid (NS 2 and NS 24) and PEG (NP 2 and NP 24). XRD results indicated that the pre-and post-modification nanofibers exhibited a semi-crystalline phase. The adsorption mechanism was predominantly guided by Van der Waals electrostatic interactions between the absorbent material and the adsorbate. Intriguingly, the citric acid and PEG modifications did not significantly alter the adsorption outcomes. The adsorption capacity remained stable over time, as evidenced by measurements of 0, 15, 30, 45, 60, 90, and 120 minutes.
Co-Authors Agung Nugroho Catur Saputro Agung Subyakto Agus Surono Anisa Ayu Solikah Ari Syahidul Shidiq Bakti Mulyani Budi Hastuti Devianti Anggraini Ramadhani Endang Susilowati Endang Susilowati Lina Mahardiani Lina Mahardiani Maria Ulfa Mohammad Masykuri Nanik Dwi Nurhayati Nanik Dwi Nurhayati Nida Damayanti Rizki Deva Maharani Shania Lorensa Sri Mulyani Sulistyo Saputro Viki Nurlatifah Yamtinah, Sri