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Perbandingan hasil belajar dan aktivitas siswa dengan menggunakan model pembelajaran Think Talk Write (TTW) dan Numbered Head Together (NHT) pada materi hukum dasar kimia dan perhitungan kimia Fabella, Yayang; Jasmidi
Educenter : Jurnal Ilmiah Pendidikan Vol. 1 No. 10 (2022): Educenter : Jurnal Ilmiah Pendidikan
Publisher : ARKA INSTITUTE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55904/educenter.v1i10.101

This study aims to the learning outcomes learning activities and a significant correlation beetweenlearning outcomes and student activities thar were taught with the TTW mode assisted and NHT on chemical of basic laws and chemical calculations matter at SMA Negeri 2 Tanjung Morawa. From the result of data analysis obtained for learning outcomes students who are taught with TTW model are higher than NHT . So hypothesis testing is carried out using one sample t test at a significant level of 5 % showing that in learning outcomes tcount more than ttable ttabel. Whereas learning activities that were taught in TTW model are higher than the learning activities NHT. For hypothesis testing showing than in learning activities tcount more than ttable. So there is significant correlation between learning outcomes and student activities taught with TTW model. The results of correlation the two variables are included in the high category.

Pengaruh pendekatan saintifik dengan media Powerpoint terhadap hasil belajar siswa pada materi ikatan kimia Sativa, Oryza; Jasmidi
Educenter : Jurnal Ilmiah Pendidikan Vol. 1 No. 12 (2022): Educenter : Jurnal Ilmiah Pendidikan
Publisher : ARKA INSTITUTE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55904/educenter.v1i12.175

This study aims to: (1) To determine whether the increase in student learning outcomes taught with a scientific approach with PowerPoint media is higher than the increase in student learning outcomes taught with conventional models (2) To determine student responses to the application of a scientific approach with PowerPoint media on the subject of chemical bonds. The population of this study were all students of class X MIA SMA Swasta Amir Hamzah Medan, as many as 40 students. The sample in this study was taken using total sampling technique. The samples taken in this study were 2 classes, namely class X MIA-1 as the experimental class and X MIA-2 as the control class. Both classes were given different treatments, the experimental class with a scientific approach and PowerPoint media , while the control class was taught with a conventional model. From the posttest results, the average value of student learning outcomes in the experimental class was 88.75 and the control class was 81.50. From the N-gain results, the percentage increase in learning outcomes of the experimental class was 84.9 percent and the control class was 76.2 percent. Based on the N-gain calculation value, the increase in learning outcomes taught with a scientific approach and PowerPoint media is higher than the increase in student learning outcomes taught with conventional models. Student response to the scientific approach and PowerPoint media on chemical bonding material has a percentage of 80.25 percent and is categorized as good.

Kinetics and Equilibrium Properties of Cu(II) Adsorption Using Modified Activated Carbon from Empty Oil Palm Fruit Bunches Br Manik, Trivena Myta; Ramadhan, Dwi Sapri; Faradilla, Putri; Rahmah, Siti; Selly, Rini; Jasmidi; Zubir, Moondra
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68724

Oil palm empty fruit bunch (EFB) is a biomass waste containing lignocellulose that has the potential to be used as activated carbon to adsorb heavy metals such as Cu(II). This study aims to compare the adsorption performance of Cu(II) ions from three types of TKKS-based adsorbents, namely pure activated carbon (A.C), Fe-Cu metal modified activated carbon (A.C-Fe-Cu), and activated carbon composite with Cu(TAC)₂ (A.C-Cu(TAC)₂). Data were obtained from two previous studies and analyzed using first- and second-order pseudo-kinetic models, as well as Langmuir and Freundlich isotherm models. Results showed that all adsorbents followed a two-order pseudo-kinetic model with R² ≥ 0.998, indicating a chemisorption mechanism. A.C-Fe-Cu showed the highest maximum adsorption capacity (389.47 mg/g) and the best fit to both isotherm models, while A.C-Cu(TAC)₂ showed suboptimal results. Thus, the modification of TKKS with Fe-Cu metal synergistically increases the effectiveness of adsorption on Cu(II) ions and has potential for wastewater treatment applications.

Adsorption of Soluble Ammonia Using A Porous Polymer Composite Cu-(TAC) And Activated Carbon Empty Fruit Palm Oil Zubir, Moondra; Jasmidi; Selly, Rini; Pulungan, Ahmad Shafwan; Miswanda, Dikki; Wardana, Novrizaldi; Rahmah, Siti; Faradilla, Putri; Ramadhan, Dwi Sapri
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68729

This study aims to determine the stages in the process of making activated carbon, synthesis of porous polymer composites Cu(TAC) and activated carbon composites (KA-Cu(TAC) for adsorption of dissolved ammonia (NH4OH). To know the characterization results of activated carbon and KA- Cu(TAC), as well as knowing the optimum mass, concentration, and contact time of activated carbon KA-Cu(TAC) for the adsorption of dissolved ammonia. The research stages started from Empty Oil Palm Bunches (EFB) used as biosorbents for carbon production at 500oC. The resulting product was activated with H3PO4, then modified with porous polymer Cu(TAC) to make a composite. The KA-Cu(TAC) composite was synthesized by reflux method. Then MOFs, activated carbon and KA-Cu(TAC) composite were characterized by BET. The BET characterization results showed that the successfully synthesized KA-Cu(TAC) composite experienced an increase in surface area.In the NH4OH adsorption process the optimum mass efficiency on activated carbon still increased at 8 grams while the KA-Cu(TAC) composite obtained an efficiency of 36, 6% and optimally at a mass of 4 g. At variations in concentration, the efficiency of the two samples still decreased. And the optimum time efficiency obtained in the NH4OH adsorption process with activated carbon was 70% and the KA-Cu(TAC) composite was 86.6%, both samples were equally optimal at 75 minutes

Kinetics and Equilibrium Properties of Fe(II) Adsorption Using Modified Empty Palm Oil Bunches Activated Carbon Khairahma; Ramadhan, Dwi Sapri; Faradilla, Putri; Rahmah, Siti; Selly, Rini; Jasmidi; Zubir, Moondra
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68743

The increasing palm oil production in Indonesia contributes to higher agricultural waste, particularly Empty Fruit Bunches (EFB). This waste can be processed into activated carbon as an adsorbent to remove Fe(II) ions from Palm Oil Mill Effluent (POME). This study reviews two EFB-based adsorbents: Fe-Cu modified activated carbon and a composite of activated carbon with Copper-TAC Metal Organic Frameworks (Cu(TAC)₂). Adsorption kinetics data show that the pseudo-second-order model fits best, with the highest regression coefficient (R² = 0.99637) found in the Cu(TAC)₂ composite, indicating a chemisorption mechanism. Adsorption equilibrium analysis using Freundlich isotherm revealed that while all materials fit the model, plain activated carbon had an unfavorable 1/n value (>1), suggesting weak interaction between adsorbent and adsorbate. Based on kinetic and isotherm analysis, the Cu(TAC)₂ composite was more effective for Fe(II) adsorption than Fe-Cu or unmodified activated carbon.

Effectiveness of Modified Empty Palm Oil Bunch-Based Activated Carbon for Reducing Ammonia Content in Palm Oil Wastewater Khairahmi; Ramadhan, Dwi Sapri; Faradilla, Putri; Rahmah, Siti; Selly, Rini; Jasmidi; Zubir, Moondra
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.68746

Indonesia, particularly North Sumatra, is a major producer of palm oil, generating significant waste such as empty fruit bunches (EFB) and ammonia-rich wastewater. Ammonia pollution poses serious environmental risks if not treated properly. This study explores the potential of three types of adsorbents—Fe-Cu modified activated carbon, AC-Cu(TAC)₂ composite, and unmodified activated carbon—for ammonia adsorption. Activated carbon was synthesized from EFB and further modified using Fe-Cu and Cu(TAC)₂. Adsorption experiments were conducted with variations in adsorbent mass, contact time, and NH₄OH concentration. The results showed that Fe-Cu modified activated carbon had the highest ammonia removal efficiency (90%), while the AC-Cu(TAC)₂ composite had the highest adsorption capacity. Equilibrium analysis revealed that the AC-Cu(TAC)₂ composite fit both Langmuir and Freundlich isotherm models (R² = 1), suggesting both monolayer and heterogeneous adsorption. The unmodified activated carbon followed the Langmuir model (R² = 0.9498), while Fe-Cu modified activated carbon did not fit either model. Kinetic studies indicated that Fe-Cu modified activated carbon followed a pseudo-first-order model (R² = 0.9936), implying physisorption, whereas both AC-Cu(TAC)₂ and unmodified activated carbon followed pseudo-second-order models (R² = 0.9779 and 0.9869), indicating chemisorption. These findings highlight the promising potential of modified EFB-based adsorbents for ammonia removal in wastewater treatment applications.

Perbandingan hasil belajar dan aktivitas siswa dengan menggunakan model pembelajaran Think Talk Write (TTW) dan Numbered Head Together (NHT) pada materi hukum dasar kimia dan perhitungan kimia Fabella, Yayang; Jasmidi
Educenter : Jurnal Ilmiah Pendidikan Vol. 1 No. 10 (2022): Educenter : Jurnal Ilmiah Pendidikan
Publisher : ARKA INSTITUTE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55904/educenter.v1i10.101

This study aims to the learning outcomes learning activities and a significant correlation beetweenlearning outcomes and student activities thar were taught with the TTW mode assisted and NHT on chemical of basic laws and chemical calculations matter at SMA Negeri 2 Tanjung Morawa. From the result of data analysis obtained for learning outcomes students who are taught with TTW model are higher than NHT . So hypothesis testing is carried out using one sample t test at a significant level of 5 % showing that in learning outcomes tcount more than ttable ttabel. Whereas learning activities that were taught in TTW model are higher than the learning activities NHT. For hypothesis testing showing than in learning activities tcount more than ttable. So there is significant correlation between learning outcomes and student activities taught with TTW model. The results of correlation the two variables are included in the high category.

Pengaruh pendekatan saintifik dengan media Powerpoint terhadap hasil belajar siswa pada materi ikatan kimia Sativa, Oryza; Jasmidi
Educenter : Jurnal Ilmiah Pendidikan Vol. 1 No. 12 (2022): Educenter : Jurnal Ilmiah Pendidikan
Publisher : ARKA INSTITUTE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55904/educenter.v1i12.175

This study aims to: (1) To determine whether the increase in student learning outcomes taught with a scientific approach with PowerPoint media is higher than the increase in student learning outcomes taught with conventional models (2) To determine student responses to the application of a scientific approach with PowerPoint media on the subject of chemical bonds. The population of this study were all students of class X MIA SMA Swasta Amir Hamzah Medan, as many as 40 students. The sample in this study was taken using total sampling technique. The samples taken in this study were 2 classes, namely class X MIA-1 as the experimental class and X MIA-2 as the control class. Both classes were given different treatments, the experimental class with a scientific approach and PowerPoint media , while the control class was taught with a conventional model. From the posttest results, the average value of student learning outcomes in the experimental class was 88.75 and the control class was 81.50. From the N-gain results, the percentage increase in learning outcomes of the experimental class was 84.9 percent and the control class was 76.2 percent. Based on the N-gain calculation value, the increase in learning outcomes taught with a scientific approach and PowerPoint media is higher than the increase in student learning outcomes taught with conventional models. Student response to the scientific approach and PowerPoint media on chemical bonding material has a percentage of 80.25 percent and is categorized as good.

Perbandingan hasil belajar dan aktivitas siswa dengan menggunakan model pembelajaran Think Talk Write (TTW) dan Numbered Head Together (NHT) pada materi hukum dasar kimia dan perhitungan kimia Fabella, Yayang; Jasmidi
Educenter : Jurnal Ilmiah Pendidikan Vol. 1 No. 10 (2022): Educenter : Jurnal Ilmiah Pendidikan
Publisher : ARKA INSTITUTE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55904/educenter.v1i10.101

This study aims to the learning outcomes learning activities and a significant correlation beetweenlearning outcomes and student activities thar were taught with the TTW mode assisted and NHT on chemical of basic laws and chemical calculations matter at SMA Negeri 2 Tanjung Morawa. From the result of data analysis obtained for learning outcomes students who are taught with TTW model are higher than NHT . So hypothesis testing is carried out using one sample t test at a significant level of 5 % showing that in learning outcomes tcount more than ttable ttabel. Whereas learning activities that were taught in TTW model are higher than the learning activities NHT. For hypothesis testing showing than in learning activities tcount more than ttable. So there is significant correlation between learning outcomes and student activities taught with TTW model. The results of correlation the two variables are included in the high category.

Pengaruh pendekatan saintifik dengan media Powerpoint terhadap hasil belajar siswa pada materi ikatan kimia Sativa, Oryza; Jasmidi
Educenter : Jurnal Ilmiah Pendidikan Vol. 1 No. 12 (2022): Educenter : Jurnal Ilmiah Pendidikan
Publisher : ARKA INSTITUTE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55904/educenter.v1i12.175

This study aims to: (1) To determine whether the increase in student learning outcomes taught with a scientific approach with PowerPoint media is higher than the increase in student learning outcomes taught with conventional models (2) To determine student responses to the application of a scientific approach with PowerPoint media on the subject of chemical bonds. The population of this study were all students of class X MIA SMA Swasta Amir Hamzah Medan, as many as 40 students. The sample in this study was taken using total sampling technique. The samples taken in this study were 2 classes, namely class X MIA-1 as the experimental class and X MIA-2 as the control class. Both classes were given different treatments, the experimental class with a scientific approach and PowerPoint media , while the control class was taught with a conventional model. From the posttest results, the average value of student learning outcomes in the experimental class was 88.75 and the control class was 81.50. From the N-gain results, the percentage increase in learning outcomes of the experimental class was 84.9 percent and the control class was 76.2 percent. Based on the N-gain calculation value, the increase in learning outcomes taught with a scientific approach and PowerPoint media is higher than the increase in student learning outcomes taught with conventional models. Student response to the scientific approach and PowerPoint media on chemical bonding material has a percentage of 80.25 percent and is categorized as good.

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