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All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Riset Kimia Al Qalam: Jurnal Ilmiah Keagamaan dan Kemasyarakatan Sainstek : Jurnal Sains dan Teknologi REACTOR : Journal of Research On Chemistry And Engineering Journal of Natural Sciences Journal of Educational Sciences YASIN: Jurnal Pendidikan dan Sosial Budaya MASALIQ: Jurnal Pendidikan dan Sains Chimica Didactica Acta : Journal of Chemistry and Chemistry Education Jurnal Pendidikan Sains Indonesia (Indonesian Journal of Science Education) Molekul: Jurnal Ilmiah Kimia IJIS Edu : Indonesian Journal of Integrated Science Education
Hardeli Hardeli
Jurusan Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Negeri Padang, Jl. Prof. Dr.Hamka, Padang
Religion Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Education Energy Environmental Science Library & Information Science Materials Science & Nanotechnology Social Sciences Other

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Penjernihan Minyak Jelantah dengan Menggunakan Terong (Solanum melongena) Rizki, Suci Yulia; Hardeli, Hardeli; Ningsih, Sherly Kasuma Warda; Pernadi, Niza Lian; Sidiq, Aqil Marsya; Nizar, Umar Kalmar
Periodic Vol 13, No 2 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i2.124544

Abstract

Used cooking oil is used oil that has been heated repeatedly with high heat. At high heating, the triglycerides contained in used cooking oil can be hydrolyzed into free fatty acids. In addition, it can form free radical compounds that can cause serious diseases such as cancer. Therefore, this study aims to clarify used cooking oil using eggplant (Solanum melongena). Eggplant is rich in beneficial ingredients such as high levels of flavonoids, phenolics and antioxidants. Eggplant can be used as an adsorbent that can clarify used cooking oil. This study used the method of heating used cooking oil at a temperature of 160⁰C and the mass variations of the eggplant were 5, 10 and 15 grams. The result of this study is that the use of 10 grams of eggplant is proven to clear used cooking oil. which was previously blackish brown underwent degradation of light brown color accompanied by a decrease in the density value to 0.94 g/mL, the acid number to 2.08 mg/KOH, and an increase in the flow rate value to 0.2987 ml/s, a saponification number of 80.17 mg KOH in used cooking oil.
Pengaruh Variasi NaOH Pada Polimerasi Kuersetin Terhadap Efisiensi DSSC Hijri, Fadhillah; Hardeli, Hardeli
Periodic Vol 12, No 3 (2023): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v12i3.118622

Abstract

Dye-sensitive solar cells are third-generation solar cells that convert photon energy into electrical energy. DSC solar cells use dyes to increase efficiency. The dye used is polymerized first to increase the amount of π -π* so that more photons are absorbed and efficiency increases. The dye used in this research is quercetin which is polymerized with a glutaraldehyde crosslinking agent. Quercetin polymerization can be influenced by several factors, one of which is NaOH which acts as an initiator. NaOH plays a role in opening the epoxy ring so that the polymer chain gets longer. ITO glass is coated with TiO2 electrodeposited with ZnO. The results of the measurement of the highest efficiency were found in the 1% NaOH of 8.33% with a density of 0.52 g/cm3 and a degree of polymerization of 3.05
Penentuan pH dan Waktu Kontak Optimum Penyerapan Ion Zn2+ Pada Silika Modifikasi Sulfonat Dwi Putri, Vika Trisna; Oktavia, Budhi; Dewata, Indang; Hardeli, Hardeli
Periodic Vol 13, No 2 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i2.124370

Abstract

Silica gel is one type of silica that can be used as an adsorbent. Silica gel has the ability to adsorb ions because it has two active sides that can be modified, namely the silanol group and siloxane. Silica modification is carried out to increase the adsorption ability of ions, one of which is Zn2+. In modified silica used 4-amino-5-hydroxy-2,7-naphthalenedisulfonate compounds as modifiers. In binding silica with modifier compounds, glycidoxypropyltrimethoxysilane (GPTMS) is added as a connecting compound. The modified silica was characterized by Infra-red spectrometer (FTIR) which showed the presence of sulfonate functional groups at wave number 1501,11 cm-1. The results of Zn2+ ion absorption with batch method are analyzed with an Atomic Adsorption Spectrophotometer (AAS) and obtained optimum conditions at pH 6 with an adsorption capacity of 1.257 mg/g with an adsorption percentage of 85,12%, at a contact time of 45 minutes with an adsorption capacity of 1.310 mg/g with an adsorption percentage of 71,29% .
Pengaruh Laju Alir Terhadap Penyerapan Ion Logam Cd2+ Menggunakan Biomassa Kulit Langsat (Lansium domesticum) dengan Metode Kolom Ideal, Flami Luthfianisa; Kurniawati, Desy; Mawardi, Mawardi; Hardeli, Hardeli
Periodic Vol 13, No 3 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i3.125540

Abstract

Increasing industrial activities have a negative impact on the ecosystem. One of them is environmental pollution. Heavy metals can be found in industrial waste whose presence can endanger living things around the industrial environment. Overcoming the presence of heavy metal ions in industrial waste can be done by biosorption methods. Biosorption is one of the strategies that can be utilized to adsorb heavy metal levels contained in wastewater. Langsat shell was used as biomass to adsorb Cd2+ metal ions using column method.  This study was conducted to determine the effect of flow rate on the absorption of Cd2+ metal ions. The results showed that the optimal absorption of Cd2+ metal ions by langsat shell occurred at a flow rate of 1 mL /  min with an absorption capacity of 16.5425 mg/gram.
Validasi E-Modul Materi Termokimia Berbasis PBL untuk Menunjang Pembelajaran Kurikulum Merdeka Fase F Kelas XI SMA/MA Elfiza, Rizma; Hardeli, Hardeli
MASALIQ Vol 4 No 4 (2024): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v4i4.3278

Abstract

Thermochemical material is material that is difficult for students to understand, so students need innovative teaching materials that adapt to current developments and technology to support independent curriculum learning. One of the teaching materials that can be developed is a PBL-based e-module. The PBL model is used to help students be creative and think critically through the process of solving problems in the real world. This research aims to develop innovative teaching materials in the form of E-Modules so that they can improve students' critical thinking abilities and increase students' interest in learning. So a PBL-based thermochemical material e-module was developed to support independent curriculum learning for phase F class XI SMA/MA using the plomp development model. In the e-module validity test, the e-module validity value was 0.90 in the valid category.
Pengembangan LKPD Berbasis Problem Based Learning untuk Meningkatkan Kemampuan Berpikir Kritis pada Materi Ikatan Kimia Fase F SMA/MA Khairanisa, Ayudia; Fitri, Bali Yana; Hardeli, Hardeli
MASALIQ Vol 5 No 1 (2025): JANUARI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i1.4346

Abstract

Chemistry lessons not only focus on mastering basic concepts, but also on developing critical thinking skills. The development of critical thinking skills in chemistry lessons has not been supported by good conditions in the field. This can be seen from the use of conventional learning models and teaching materials that are often used, namely only package books. So that to fulfill the effective learning process, teaching materials are needed that can help students achieve critical thinking skills. This research aims to produce a PBL-based LKPD to improve critical thinking skills in chemical bonding material phase F SMA/MA. This type of research is Educational Design Research with the Plomp development model. The subjects of this study are UNP chemistry lecturers, chemistry teachers of SMAN 1 Koto XI Tarusan and students of SMAN 1 Koto XI Tarusan. Data was obtained from validity questionnaires, practicality sheets, and pretest and posttest scores. The validation data was processed using Aiken's V formula. Based on the results found, it can be concluded that the LKPD developed is already in the valid category with an Aiken's V value of 0.88 and is very practical with a percentage of practicality based on teacher assessments of 92% and students of 91%. To see the improvement of critical thinking skills, pretest and posttest were carried out for students. Based on the results of the study, an N-Gain value of 0.7 was obtained. It can be concluded that LKPD is valid and very practical to be used in learning and is efficiently used to improve students' critical thinking skills.
DEVELOPMENT OF STUDENT WORKSHEETS ON THE PERIODIC SYSTEM OF ELEMENTS BASED ON CONTEXTUAL TEACHING AND LEARNING FOR PHASE-E SENIOR HIGH SCHOOL Risty, Chika Mei; Kurniawati, Desy; Hardeli, Hardeli; Zainul, Rahadian; Syolendra, Dwi Finna
Chimica Didactica Acta Vol 12, No 2: December 2024
Publisher : FKIP USK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jcd.v12i2.42002

Abstract

This study aimed to produce teaching materials in student worksheets based on contextual teaching and learning and to determine the validity and practicality of the student worksheets developed. The research method used is educational design research (EDR), with the Plomp development model carried out until the validity and practicality test stages are achieved. This development research shows that the contextual teaching and learning-based student worksheets developed are valid and practical. This is supported by the validation results, which have an average value of 0.91 and are included in the very valid category. The practicality results obtained from the small group test of students get a percentage of 95%, and the percentage result from the teacher is 92%, which is included in the Highly practical category. These results indicate that the student worksheets developed are feasible to be applied to learning to help students' understanding of concepts on the material of the periodic system of elements and encourage students to become active, creative, and critical learners. The results of this study indicate that the student worksheets developed are suitable for use in the learning process on the material of the periodic system of elements in phase E Senior High School.
Meta-Analysis Study: The Influence of Project Based Learning Models on Creativity and Science Learning Outcomes of Elementary School Students Sari*, Rona Taula; Angreni, Siska; Mohtar, Lilia Ellany; Lufri, Lufri; Asrizal, Asrizal; Hardeli, Hardeli
Jurnal Pendidikan Sains Indonesia Vol 12, No 3 (2024): JULY 2024
Publisher : Universitas Syiah Kuala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jpsi.v12i3.38375

Abstract

The project based learning (PjBL) model is expected to be able to change students' learning styles by increasing motivation in learning, creativity in work, generating creative ideas, and being able to think critically. The meta-analysis research aims to find out how big the effect of the PjBL model is on the creativity and science learning outcomes of elementary school students?; Does the implementation of the PjBL model affect the creativity and science learning outcomes of elementary school students? Collecting articles using the publish or perish application with the keywords PjBL model, creativity, and elementary science learning outcomes. The data obtained was analyzed by calculating the effect size of each journal. Analysis of the average effect size of 0.92 is in the large category. The PjBL model influences the creativity and learning outcomes of elementary school students with r RE = 0.925 in the high category. This shows that the PjBL model can increase student creativity and learning outcomes in elementary school science learning. The PjBL model can improve and develop creativity and high-level thinking skills based on the demands of the 4.0 era.
Development of Chemistry Teaching Materials with Demonstration Videos on the Acid–Base Concept to Support the Merdeka Curriculum Nabilah, Hafizah; Hardeli, Hardeli
Journal of Educational Sciences Vol. 9 No. 4 (2025): Journal of Educational Sciences
Publisher : FKIP - Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jes.9.4.p.2101-2111

Abstract

The transition to the Merdeka Curriculum has significantly impacted Indonesia's education system, requiring both teachers and students to adopt more innovative and creative learning approaches. However, appropriate teaching materials are still limited, particularly for abstract topics such as acid–base concepts. This study aimed to develop chemistry teaching materials equipped with demonstration videos to support learning in accordance with the Merdeka Curriculum. The research employed an Educational Design Research (EDR) approach using Plomp’s development model, which includes preliminary research, prototyping, and assessment stages. Data were collected through interviews and questionnaires on validity and practicality, and analyzed using Aiken's V formula. The results showed a validity score of 0.85, indicating a high level of validity. Practicality tests showed a score of 94% from teachers and 92% from students, categorized as very high. These findings conclude that the developed acid–base teaching materials for Phase F senior high school students are valid and practical for implementation in Merdeka Curriculum learning.
Harnessing Nature's Colors: Combining Plant Pigments and Metal Coatings for Dye-Sensitized Solar Cell Hardeli, Hardeli; Sanjaya, Hary; Yunita, Lasmi; Novita, Indri Panca; Agdisti, Nurul Fadilah; Luli, Rahmaneta; Permatasari, Putri
Molekul Vol 20 No 2 (2025)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2025.20.2.14891

Abstract

ABSTRACT. This study aims to improve the efficiency of dye-sensitized solar cells (DSSCs). To overcome the recombination problem in the commonly used TiO2 semiconductor, we performed electrodeposition of ferrous metal (Fe) on TiO2. XRD characterization showed that after Fe electrodeposition, the crystal structure of TiO₂ remained in the anatase phase without significant changes compared to before deposition while based on SEM-EDS results, Fe was dispersed to form small agglomerates that functioned as metal contacts to reduce electron recombination. We also investigated the use of anthocyanins from various natural sources, including jengkol skin, senduduk fruit, mangosteen skin, and red grape skin. These anthocyanins were copigmented with salicylic acid. UV-Vis spectroscopy revealed that copigmentation caused a bathochromic shift and FTIR spectrum confirmed strong interaction between anthocyanins and salicylic acid through hydrogen bond formation. The combination of TiO2-Fe layers with pigmented dyes resulted in diverse DSSC efficiencies, with mangosteen peel showing the best performance (4.123%), followed by senduduk fruit (3.495%), grape peel (2.569%), and jengkol peel (1.925%). The increase in efficiency from 1.189% (without Fe coating) to 1.700% (with Fe coating) demonstrates the potential of this technique. The small TiO2 crystal size (about 61.8 nm) also contributes to the increased surface area, enhancing dye absorption and solar cell performance. The electrical efficiency showed that the combination of TiO2-Fe with copigmented anthocyanins from mangosteen skin produced DSSCs with the highest efficiency, demonstrating the potential of this approach to improve the performance of natural dye-based solar cells. Keywords: Co-pigmentation, dye-sensitized solar cell, Fe electroplating, natural dye.
Co-Authors Agdisti, Nurul Fadilah Angreni, Siska Anna Maulina Asrizal Aulia, Annisa Bahrizal Bahrizal Budhi Oktavia Darmanella Dian Eka Wati Desy Kurniawati Dwi Agustini, Dwi Dwi Finna Syolendra Dwi Putri, Vika Trisna Edi Nasra Elfiza, Rizma Ernica, Santri Yuli Fisyabilillah, Dea Fitri, Bali Yana Harahap, Riri Indah Nitami Hary Sanjaya Hijri, Fadhillah Ideal, Flami Luthfianisa Indang Dewata Jayawarsa, A.A. Ketut Khairanisa, Ayudia Lasmana, Oria Lufri Lufri Luli, Rahmaneta Mohtar, Lilia Ellany Muhammad Farhan Nabilah, Hafizah Nizar, Umar Kalmar Nofriyanti, Desi Novita, Indri Panca Pernadi, Niza Lian Putri Permatasari, Putri Putri, Tiara Dwi Putri, Yollanda Prissila Rahadian Zainul Rahmi, Fathaniah Raviqa Ratih Komala Dewi Retno Damayanti Risty, Chika Mei Rizki, Suci Yulia Sabrina, Joya Sari*, Rona Taula Sherly Kasuma Warda Ningsih Sidiq, Aqil Marsya Subriadi, Hanifah Putri Indah Susanti, Melly Yunita, Lasmi