Article Per Year (5 Year)
p-Index From 2021 - 2026
5.701
P-Index
This Author published in this journals
All Journal Indonesian Journal of Cancer Chemoprevention Jurnal Kimia Riset Jurnal Teknologi dan Sistem Komputer International Journal of Science and Applied Science: Conference Series Jurnal Penelitian Pendidikan IPA (JPPIPA) INKUIRI : Jurnal Pendidikan IPA ALCHEMY Jurnal Penelitian Kimia Jurnal Pengabdian Pada Masyarakat Jurnal Pendidikan Kimia (JPKim) Indonesian Journal of Chemistry Communications in Science and Technology International Journal of Pedagogy and Teacher Education International Journal of Community Service Learning JKPK (Jurnal Kimia dan Pendidikan Kimia) Bubungan Tinggi: Jurnal Pengabdian Masyarakat Jurnal Abdi Masyarakat Indonesia Bulletin of Chemical Reaction Engineering & Catalysis Journal of Environment and Sustainability Education
Maria Ulfa
Universitas Sebelas Maret
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Public Health Social Sciences Other

Published : 35 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 35 Documents
Search

 1   2   3   4 
Comparative Study of Soft Template on Gunningite Synthesis for Ibuprofen Adsorption Application Maria Ulfa; Windi Apriliani
Indonesian Journal of Chemistry Vol 23, No 2 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.79098

Abstract

This study aimed to investigate the effect of soft template variations on Zinc Sulfate Hydrate (Gunningite) synthesis and the maximum adsorption capacity of ibuprofen. This study employed the soft template method and hydrothermal at 100 °C, followed by calcination at 550 °C. Here, ZnSO4 heptahydrate was used as the precursor for different templates. XRD analysis exhibited that the crystal sizes of Gunningite-F127G, Gunningite-F127, Gunningite-P123G, Gunningite-P123, and Gunningite-G were 18.35; 25.33; 25.67; 27.30; and 24.24 nm with crystallinity degrees of 36.89; 42.62; 46.83; 41.27; and 40.62%, respectively. FTIR examination indicated that the five samples contained functional groups of OH stretching at 3170 cm–1, Zn-O-Zn at 1637 cm–1, Zn-S=O symmetric and asymmetric at 900 and 1056 cm–1, and Zn-O at 521 cm–1. Furthermore, SEM-EDX investigation revealed that the morphology of all Gunningite samples was inhomogeneous due to agglomeration. Besides that, the elemental compositions in the samples were dominated by Zn and O elements. The maximum adsorption capacity obtained from each sample was 221.1 mg/g (Gunningite-F127G); 226.06 mg/g (Gunningite-F127); 234.23 mg/g (Gunningite-P123G); 229.76 mg/g (Gunningite-P123); and 222.85 mg/g (Gunningite-G). Moreover, the Gunningite kinetic model of ibuprofen adsorption followed Ho and McKay's pseudo-second-order kinetic model.
The Effect of Zinc Oxide Supported on Gelatin Mesoporous Silica (GSBA-15) on Structural Character and Their Methylene Blue Photodegradation Performance Maria Ulfa; Ida Setiarini
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 2 Year 2022 (June 2022)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.2.13712.363-374

Abstract

Gelatin mesoporous silica SBA-15 (GSBA-15) with rod-like morphology has been successfully synthesized by hydrothermal method using P-123:gelatin, then aged at 90 °C for 24 h and calcined at 550 °C for 5 h. GSBA-15 was impregnated with ZnO amounts of 1; 5; and 10 wt% to obtain Zn/GSBA-15. Samples were characterized by X-ray Diffraction (XRD), Fourier Transform Infra Red (FTIR), Scanning Electron Microscopy (SEM), and Brunauer-Emmett-Teller (BET). The efficiency of methylene blue photodegradation was determined by a UV-Vis spectrophotometer. The FTIR result is functional groups of ZnO/GSBA-15, those were Si−O−Si, −OH, Zn−OH, and Zn−O. The morphology of ZnO/GSBA-15 was rod-like, and it consisted of silica, oxygen, and Zn. The surface area and pore volume of GSBA-15 declined (surface area from 520.8 to 351.9 m2/g and pore volume from 0.707 to 0.564 cm3/g) after ZnO impregnation due to pore blocking. At the same time, increasing pore diameter (from 2.82 nm to 3.19 nm) and crystallite size (from 5.1 nm to 12.6 nm) were observed due to the overlapping of ZnO-Silica particles. The increasing incorporation of ZnO on the silica GSBA-15 framework increases the photodegradation performance from 88.76% to 94.90% due to the high surface area, functional group rich, and dispersion of ZnO active sites. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Understanding Pore Surface Modification of Sucrose-Modified Iron Oxide/Silica Mesoporous Composite for Degradation of Methylene Blue Yuvita Eka Pertiwi; Maria Ulfa; Teguh Endah Saraswati; Didik Prasetyoko; Wega Trisunaryanti
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 3 Year 2021 (September 2021)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.3.10619.459-471

Abstract

Santa Barbara Amorphous (SBA-15) containing iron oxide with a sucrose-modified in a heterogeneous reaction for degradation methylene blue (MB) successful synthesized used hydrothermal, ultrasonication, and wet impregnation method. SBA-15 is mesoporous silica that can easily serve as external and internal surfaces making it suitable for a wide range of applications. The structure and morphology of materials were characterized using Surface Area Analyzer (SAA), X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), and Transmission Electron Microscopy (TEM). Iron oxide impregnated as a maghemite phase has an average size of 12 nm and well distributed on the SBA-15. After modified with sucrose the materials remaining stable, which has a two-dimensional hexagonal (p6mm) structure, high specific surface area, and large pore volume (up to 1.82 cm3.g−1). The degradation of MB was evaluated under visible light irradiation using UV-Vis spectroscopy. Catalytic activity showed efficiencies of 52.9; 70.2; and 21.1% for SBA-15, Fe2O3/SBA-15, and sucrose-modified Fe2O3/SBA-15 respectively. Sucrose-modified Fe2O3/SBA-15 has the lowest efficiency, which probably occurs due to the presence of pore-blocking and the formation of micropores on the external pore. The modification with sucrose has the advantage of producing a high surface area even though there is a catalytic center due to partial decomposition which causes a decrease in the efficiency of degradation of MB. All materials provide a high micro surface area so that they can be further adapted and can be widely applied to many potential applications as both catalyst support and an adsorbent. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Synthesis of Mesoporous Silica Incorporated with Low Iron Concentration and Gelatin Co-Template via The Ultrasonication Method and Its Methylene Blue Photodegradation Performance Maria Ulfa; Sandini Ajeng Istanti
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 4 Year 2022 (December 2022)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.4.16210.831-838

Abstract

In this work, low iron concentration incorporated on mesoporous silica with gelatin co-template (Fe2O3/GSBA-15) has been successfully synthesized via the ultrasonication method. The physical, chemical, and structural properties of the samples were investigated with X-Ray Diffraction (XRD), Scanning Electron Microscope- Energy Dispersive X-Ray (SEM-EDX), Fourier Transform Infra-Red (FTIR), and N2 adsorption-desorption. Results showed good distribution of low concentration of iron oxide on the gelatin mesoporous silica GSBA-15. Elemental and surface analysis presented that iron oxide incorporation with higher concentration exhibited lower surface area due to the blocking pore. The highest photocatalytic activity on the methylene blue dye degradation was achieved at 10% Fe2O3/GSBA-15 with ~80% efficiency. The results revealed that the photocatalytic activity of Fe2O3/GSBA-15 enhanced with the presence of iron oxide. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
ZnO-Activated Carbon Blended as a Catalyst for Oxidative Desulfurization of Dibenzothiophene Wega Trisunaryanti; Satriyo Dibyo Sumbogo; Safa Annissa Novianti; Dyah Ayu Fatmawati; Maria Ulfa; Yatim Lailun Nikmah
Bulletin of Chemical Reaction Engineering & Catalysis 2021: BCREC Volume 16 Issue 4 Year 2021 (December 2021)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.16.4.11797.881-887

Abstract

The problem of sulfur content in heavy oil is a challenge for researchers to meet the needs of environmentally friendly fuels. The catalyst preparation plays an important role in the desulfurization process. The synthesis of ZnO-activated carbon as a catalyst and its activity in oxidative desulfurization (ODS) reaction has been successfully carried out. In this work, the ZnO and activated carbon (AC) were blended by a solid-solid reaction. The ZnO, AC, and ZnO-AC were then characterized using acidity test with pyridine vapor adsorption, Fourier Transform Infra-Red (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), and Surface Area Analyzer (SAA). ODS of dibenzothiophene (DBT) reaction was performed by using H2O2 under variation of the reaction time (30, 60, 120, and 150 min) for the ZnO-AC catalyst. The efficiency of ODS-DBT was analyzed by a UV-Visible spectrophotometer. The XRD analysis result showed that ZnO-AC blended displays new crystal peaks of Zn in the AC diffractogram. The surface area (734.351 m2/g) and acidity (4.8780 mmol/g) of ZnO-AC were higher than ZnO and AC themselves. ZnO-AC produced the highest efficiency of ODS-DBT which was 93.83% in the reaction time of 120 min. Therefore, the simple procedure of this physical blending was proved effective to homogenize between ZnO and AC into ZnO-AC so that it has good physicochemical properties as an ODS-DBT catalyst. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Bahasa Inggris Ika Uswatun Hasanah; Maria Ulfa; Sri Yamtinah; Mohammad Masykuri; Bakti Mulyani; Ari Syahidul Shidiq
Jurnal Penelitian Pendidikan IPA Vol 9 No 11 (2023): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i11.4628

Abstract

The purpose of this experiment was to determine whether or not there were differences in the learning model between Process-Oriented Guided Inquiry Learning (POGIL), Problem Based Learning (PBL), and Teacher-Centered Learning (TCL) with the application of HOTS questions in their learning on students' critical thinking skills. This study used a quasi-experimental research design with the static group pretest-posttest design. The sampling technique used the cluster random sampling technique. The population of this research is the students of class XI MIPA SMA Negeri Gondangrejo in the academic year 2021/2022. The results showed that there were differences in students' critical thinking skills in the POGIL and PBL learning models with conventional learning, all three of which used the application of HOTS questions in their learning. This is based on the significant value of the One-Way ANOVA test, a significance value of <0.05 is obtained, which is 0.000, which means that H0 was rejected. Then, based on the calculation of the N-gain score for each POGIL, PBL, and TCL learning model, the results obtained are 0.71 in the high category; 0.54 in the medium category; and 0.39 in the medium category. However, based on the results of the Post Hoc-Scheefe test between the POGIL and PBL learning models, a significance value of > 0.05 was obtained, which was 0.098, so it could be concluded that there was no significant difference between the POGIL and PBL learning models on critical thinking skills. Therefore, both POGIL and PBL learning models can help improve students' critical thinking skills. The average critical thinking ability in the POGIL experimental class, PBL experimental class, and control class after treatment was 69.44%, 68.54%, and 59.72%.
Strengthening ASEAN STEAM Collaboration: Empowering Chemistry Teachers through Training on Developing STEAM-Based Assessment Instruments Sri Yamtinah; Bakti Mulyani; Mohammad Masykuri; Maria Ulfa; Ari Syahidul Shidiq
Bubungan Tinggi: Jurnal Pengabdian Masyarakat Vol 6, No 4 (2024)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/btjpm.v6i4.11686

Abstract

STEAM (Science, Technology, Engineering, Art, and Mathematics) is a learning approach that encourages students to think broadly about real-world problems. However, the limited knowledge of chemistry teachers about the STEAM-based learning and assessment process causes this approach to be rarely implemented. This service aims to train teachers' skills to develop STEAM-based assessment instruments. The workshop method is used with implementation stages including preparation, implementation, evaluation, and reporting. This activity was carried out in a hybrid manner, with presentations by lecturers from Universiti Sains Malaysia and Sebelas Maret University. Participants in this activity were 68 chemistry teachers from various regions of Indonesia. Test instruments totaling 15 questions in the pretest and posttest, as well as questionnaire instruments totaling 18 questions, were used to evaluate the results of this training. As a result, participants' knowledge and skills about STEAM learning increased after the training. In addition, as many as 44% of participants are very interested in implementing STEAM in the chemistry learning process in schools. As evaluation materials, participants gave suggestions to increase the explanation time and provide more examples of STEAM-based instruments.
Enhancing creativity skills and student learning outcomes through the implementation of creative problem solving model with mind mapping on salt hydrolysis topic Bella Windira Sari; Sri Retno Dwi Ariani; Ari Syahidul Shidiq; Bakti Mulyani; Sri Yamtinah; Mohammad Masykuri; Maria Ulfa; Agung Nugroho Catur Saputro
Jurnal Pendidikan Kimia Vol. 16 No. 2 (2024): August
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i2.58765

Abstract

In the face of increasing demands for 21st-century skills, chemistry education must advance to better support students in developing problem-solving abilities. Effective chemistry learning models are crucial in addressing this need. This study examines the impact of the Creative Problem Solving (CPS) model, equipped with the Mind Mapping method, on students' creative thinking skills and cognitive learning outcomes in salt hydrolysis. A quasi-experimental method with a pretest-posttest control group design was used in this research. Cluster random sampling was employed for sample selection. The sample consisted of 72 students from a school in Surakarta City. Data were collected using a test instrument with eight essay questions to assess creative thinking skills and six essay questions to evaluate cognitive learning outcomes. Non-parametric statistical tests were utilized for data analysis. The results of the Kruskal-Wallis™s test produce sig. (0.000 < 0.05) which means the hypothesis is accepted. The results showed that applying the CPS learning model with mind mapping affected students' creative thinking skills and cognitive learning outcomes so that it can be used as an alternative learning model to improve 21st-century skills. This research contributes new insights into applying the Mind Mapping-assisted CPS learning model for chemistry education.
The differentiated STEM approach in problem-based learning: Can it enhance students’ critical thinking skills in basic chemistry laws Karima Majid; Sri Mulyani; Maria Ulfa; Ari Syahidul Shidiq
Jurnal Pendidikan Kimia Vol. 16 No. 3 (2024): J. Pendidik. Kim : December 2024
Publisher : Pascasarjana Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/jpkim.v16i3.65175

Abstract

The 21st century highlights the critical role of education in developing life skills, including critical thinking, to address rapid global changes. The learning process in schools becomes a critical factor in strengthening these skills. Therefore, this study aims to determine the effect of the Differentiated Problem-Based Learning (PBL) model with the STEM approach on students' critical thinking skills on basic chemical laws in class X of a Senior High School in Surakarta. Samples were selected using cluster random sampling to choose two classes as samples, namely, the experimental and control classes. Research data was collected through a post-test using an essay measuring students' critical thinking skills. The results were analyzed using the Kruskal-Wallis’s test based on the mean post-test scores of the experimental class (73.00) and the control class (64.4), yielding a significance value of 0.004 (< 0.05). These results indicate a positive effect of Differentiated PBL-STEM on students' critical thinking skills. Skilled group students consistently demonstrated critical thinking skills, while students in the intervention and intermediate groups showed improvements from the initial diagnostic results of the learning process.
Bahasa Inggris Hafid Al Afif; Maria Ulfa; Sri Yamtinah; Mohammad Masykuri; Bakti Mulyani; Ari Syahidul Shidiq
Jurnal Penelitian Pendidikan IPA Vol 11 No 7 (2025): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i7.4314

Abstract

The study conducted at SMA N Karangpandan aimed to assess the literacy abilities of class X students using the AKM instrument based on chemical science. The research employed a descriptive qualitative method with purposive sampling, involving 137 students from various class X groups. Data was collected through tests and interviews. The findings revealed that 5% of students required special intervention, 17% were in the basic literacy category, 31% demonstrated proficient literacy, and 47% exhibited advanced literacy. Those needing intervention could retrieve explicit information but struggled with proper interpretations. Students with basic literacy could find and interpret explicit information effectively, while proficient students could handle implicit information and integrate portions of it. Advanced students demonstrated the ability to integrate, evaluate, and reflect upon text. The utilization of the AKM instrument aimed to familiarize class X students with AKM questions, helping them comprehend question forms, content, and context. The study's outcomes serve as an indicator of class X students' readiness for AKM assessments, offering insights into their literacy levels and providing a basis for further educational strategies.
Co-Authors Afifah Khoirunnisa Agung C. Saputro Agung Nugroho Catur Saputro Agung Nugroho Catur Saputro Agung Nugroho Catur Saputro Agung Nugroho Catur Saputro Anif Nur Artanti Anisa Ayu Solikah Annisa Nur Khasanah Ari Syahidul Shidiq Ari Syahidul Shidiq Ari Syahidul Shidiq Ari Syahidul Shidiq Ari Syahidul Shidiq Ari Syahidul Shidiq Ari Syahidul Shidiq Atmia Lauhiulafa Bakti Mulyani Bakti Mulyani Bakti Mulyani Bayu Antrakusuma, Bayu Bella Windira Sari Budi Utami Cindy Nur Anggreani Dewi Wardani Didik Prasetyoko Dyah Ayu Fatmawati Dyah Ayu Fatmawati Dyah Puspitasari Elfi Susanti Vh Endang Susilowati Endang Susilowati Endar Wihidayat Esa Karisyah Putri Utomo Farhah Nayla Fawzia Hafid Al Afif Haryono Setiadi Icha Kurnia Wati Ida Setiarini Ida Setiarini Ida Setiarini Iip Izul Falah Iip Izul Falah Ika Uswatun Hasanah Ika Uswatun Hasanah Ika Wulandari Indriana Kartini Indriana Kartini Isma Aziz Fakhrudin Istinganah Saestu Rohmah Istinganah Saetu Rohmah Karima Majid Kusumandari, Kusumandari Laras Kusuma Wardani Meida Wulan Sari Mohammad Masykuri Mohammad Masykuri Mohammad Masykuri Mohammad Masykuri Mohammad Masykuri Mohammad Masykuri Muhammad Ari Purnama Ali Naimina Restu An Nabil Nanik Dwi Nurhayati Novia Amalia Sholeha Nurma Yunita Indriyanti Rizki Fauzia Hanif Safa Annissa Novianti Safa Annissa Novianti Salma Fauzia Wardani Sandini Ajeng Istanti Satriyo Dibyo Sumbogo Sri Mulyani Sri Retno Dwi Ariani Sri Yamtinah Sulistyo Saputro Suwiji Lestari Teguh Endah Saraswati Triyono Triyono Viki Nurlatifah Warih Purwendah Wega Trisunaryanti Wega Trisunaryanti Wega Trisunaryanti Wega Trisunaryanti Wega Trisunaryanti Widyaswari Mahayanti Windi Apriliani Wirawan Ciptonugroho Yatim Lailun Ni’mah Youlanda Jesiva Alba Yuli Iswanti Yuvita Eka Pertiwi Zahra Ayu Fadhilah Zamira Zia&#039;ul Huda Zulfana Qoulan Syadida