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All Journal Jurnal Periodic Jurusan Kimia UNP Jurnal Penelitian Pendidikan IPA (JPPIPA) Sains Natural: Journal of Biology and Chemistry JURNAL PENDIDIKAN TAMBUSAI FONDATIA EDUKATIF : JURNAL ILMU PENDIDIKAN JURNAL PENDIDIKAN MIPA Pelita Eksakta Jurnal Paedagogy Edunesia : jurnal Ilmiah Pendidikan Edukimia Hydrogen: Jurnal Kependidikan Kimia Jurnal Simki Pedagogia Afeksi: Jurnal Penelitian dan Evaluasi Pendidikan Jurnal Pijar MIPA Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram MASALIQ: Jurnal Pendidikan dan Sains International Journal of Educational Research Excellence (IJERE) Duta Pharma Journal Chimica Didactica Acta : Journal of Chemistry and Chemistry Education
Suryani, Okta
Departemen Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam Universitas Negeri Padang
Religion Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Physics Social Sciences Other

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Pengaruh pH Pada Penentuan Ion Logam Fe3+ Secara Anodic Stripping Voltammetry Menggunakan Pencil Lead Electrode Modifikasi Lapisan Tipis Emas Akhmad, Ashta Varan; Sari, Trisna Kumala; Ulianas, Alizar; Suryani, Okta
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.v13i2.124502

Abstract

Fe3+ metal ions have been electrochemically detected using a pencil lead electrode modified with gold thin layer. The modification of the gold thin layer is carried out by sweeping-potential electrodeposition using the cyclic voltammetry method. The purpose of this study was to determine the optimum pH conditions for measuring Fe3+ metal ions using HNO3 as a supporting electrolyte. The pH optimization is carried out using the Anodic Stripping Voltammetry (ASV) method. This technique involves a pre-concentration step where Fe3+ is reduced to Fe0 on the electrode surface in HNO3, followed by a stripping step in ASV where Fe0 is oxidized back to Fe3+. The results showed that HNO3 with pH 1 is the optimum pH for measuring Fe3+ metal ions using Au/PLE electrodes with a test analyte concentration of 250 μM. The anodic peak of the Fe3+ metal ion appears at a potential of 0.55 V.
Pengaruh Supporting Electrolyte pada Penentuan Formaldehida secara Voltametri Siklik Menggunakan Au/MWCNT/GCE Annisa, Ananda Suci; Sari, Trisna Kumala; Dewata, Indang; Khair, Miftahul; Suryani, Okta
Periodic Vol 13, No 1 (2024): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v13i1.124524

Abstract

Formaldehyde was detected electrochemically using a modified glassy carbon electrode with a multi-walled carbon nanotube (MWCNT) and a thin layer of gold (Au). Modification of MWCNT was carried out by drop coating, while modification of the thin layer of gold was carried out by sweeping-potential electrodeposition using the cyclic voltammetry method. The purpose of this study was to develop a formaldehyde sensor using Au/MWCNT/GCE and to determine the optimum conditions of the supporting electrolyte for formaldehyde measurement. The results showed that Au/MWCNT/GCE provided better catalytic activity than GCE, MWCNT/GCE and Au/GCE electrodes in the determination of formaldehyde. The optimum supporting electrolyte obtained was KOH with a test analyte concentration of 10 mM. The oxidation peak of formaldehyde I is at a potential of 0.0264 V and peak of oxidation of formaldehyde II is at a potential of 0.075 V.
Development of Teaching Materials to Support Learning of the Merdeka Curriculum on Chemical Equilibrium Rizal, Putri Nadia; Mawardi, Mawardi; Suryani, Okta
Edunesia : Jurnal Ilmiah Pendidikan Vol. 5 No. 3 (2024)
Publisher : research, training and philanthropy institution Natural Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51276/edu.v5i3.1008

Abstract

Teaching materials are an essential part of independent curriculum learning. This study aims to determine valid and practical teaching materials on chemical equilibrium material that can support learning the independent curriculum phase F SMA / MA. The research used the Education Design Research type of research with the Plomp development model. The research includes development stages up to prototyping and testing in small groups. The instruments used were a validity questionnaire and a practicality questionnaire. Validity was assessed using the Aikens ' V formula modified by Purwanto to assess practicality Purwanto. The results showed that the validity test obtained 0.86 with a valid category. The results of the practicality test for teacher responses were obtained at 95% with an efficient category, and for student responses, obtained at 95% with an efficient category. These results state that the teaching materials created and developed are valid and practical. Then, the results showed that the multilevel representation approach emphasizes mastery at the macroscopic, submicroscopic, and symbolic levels. Mental models can be used to describe these three levels. A good mental model can help students relate scientific concepts to their thinking.
Development Of Teaching Material To Support Merdeka Curriculum On Stoichiometry For Phase F Damiyanti, Damiyanti; Mawardi, Mawardi; Suryani, Okta
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i3.11687

Abstract

This study aims to develop teaching materials to support merdeka curriculum learning on stoichiometry material phase F SMA / MA. This research uses the Eduactional Design Research (EDR) method with the Plomp development model which consists of three stages, namely the preliminary research stage, the development or prototyping phase, and the trial and assessment phase. Data collection was carried out using validity and practicality questionnaires. The subjects of this study were three chemistry lecturers, two chemistry teachers and nine students with high, medium and low ability levels. The validity questionnaire was given to three chemistry lecturers and two chemistry teachers while the practicality questionnaire was given to two chemistry teachers and nine students. The results showed that the validity test obtained a validity value of 88% which was declared a valid category. While the results of the practicality test for chemistry teachers obtained a value of 91% which was declared a very practical category and the results for students obtained a value of 93% which was declared a very practical category. Based on the results of the study, it was found that the development of teaching materials to support merdeka curriculum learning in SMA/MA phase F stoichiometry material was valid and practical
Development of LKPD based on project-based learning oriented chemo-entrepreneurship on hydrocarbon material for phase F SMA/MA Velly, Aglin; Suryani, Okta
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i3.12442

Abstract

This development research was conducted to develop a teaching material in the form of a project-based learning worksheet (LKPD) based on chemo-entrepreneurship-oriented learning on hydrocarbon material for phase F SMA / MA. The validity and level of practicality will be known. The type of research used is educational design research (EDR) with the Plomp development model which has three stages, namely preliminary research (initial investigation), prototyping phase (prototype formation stage), and assessment phase (assessment/testing). However, the assessment phase was not carried out in this study where the research was carried out until the results of the validity and practicality of the LKPD were obtained. The validity test was conducted by 3 chemistry lecturers at FMPA UNP and 2 chemistry teachers at SMAN 3 Padang using a validity questionnaire sheet. Practicality was conducted by 2 chemistry teachers and 9 students of phase F SMAN 3 Padang. The results of the study based on the validity test showed an average Aiken'V 0.87 with a valid category and based on the practicality test showed an average of 90% by students with a very practical category and 94% by teachers with a very practical category. The research results of project-based learning-based LKPD oriented chemo-entrepreneurship on hydrocarbon material for phase F SMA / MA have been valid and practical.
Development of LKPD Based on Project Based Learning Stoichiometry Material by Utilizing Organic Waste for Phase F SMA/MA Rahmad, Nafisah Yulia; Suryani, Okta
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 3 (2024): June-July 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i3.12443

Abstract

The project-based learning model is one of the learning models that supports the application of concepts in everyday life. From the results of the questionnaire given, Project Based Learning-based LKPD is needed and it is very important to compile Project Based Learning-based stoichiometry LKPD in supporting learning in the era of an independent curriculum. The type of research used is development research or Educational Design Research (EDR) with the Plomp development model by Tjeerd Plomp. The research was conducted at SMA Negeri 4 Padang with research subjects namely 3 Chemistry Lecturers FMIPA UNP, 2 SMA Negeri 4 Padang teachers and 9 students of class XI SMA Negeri 4 Padang. The object of research is LKPD based on project-based learning on stoichiometry material by utilizing organic waste for phase F SMA / MA. In terms of research, Plomp as a development study has 3 main stages, namely the initial research stage, the prototype formation stage, and the assessment stage. The results showed that all aspects assessed in each component of the validation of project-based learning-based LKPD on stoichiometry material by utilizing organic waste for phase F SMA / MA obtained an average V value of 0.92 with a valid category. The results are very practical for teachers with an average practicality of 91% and practicality for students is very practical with an average practicality of 89%. Based on the results of the study, it was found that the development of LKPD based on project-based learning on stoichiometric material by utilizing organic waste for phase F SMA / MA was developed valid and practical.
Sintesis dan Karakterisasi Fotokatalis Hierarchical Porous TiO2/Cu (HPT/Cu) dengan Metode yang Ramah Lingkungan Syawal, M Ichlas; Suryani, Okta
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.v13i3.125637

Abstract

Most of the energy consumed comes from non-renewable fossil fuel resources. Therefore, renewable and environmentally friendly energy resources are needed, namely sunlight. One way to utilize sunlight is to store it into hydrogen compounds. Hydrogen comes from water through a process of breaking down its molecules which is called water decomposition. Water decomposition uses sunlight and a semiconductor photocatalyst, such as TiO2. In this research, TiO2 has been synthesized whose morphological structure has been modified (Hierarchical Porous TiO2) and doped with Cu metal to reduce the band gap. Hierarchical Porous TiO2 (HPT) has been successfully synthesized. XRD characterization to determine the structure and size of the particles. HPT has an anatase crystal structure with an average particle size of 19.24 nm. HPT has an energy band gap of 3.25 eV. Then doping with Cu metal causes the band gap to decrease to 2.79 eV. Metal doping has been proven to reduce the band gap energy of the HPT semiconductor photocatalyst
Sintesis dan Karakterisasi TiO2/Zn Dengan Metode Yang Ramah Lingkungan Rahimmah, Nur; Suryani, Okta
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.v13i3.125790

Abstract

The increasing use of fossil fuels leads to increased carbon emissions from the combustion process of fossil fuels. Therefore, sustainable and environmentally friendly alternative energy sources are needed as a substitute for fossil fuels. Hydrogen is one of the potential substitutes for fossil fuels because it has the highest energy density and is environmentally friendly. Hydrogen can be produced through photochemical water splitting by utilizing solar energy and abundant water resources. Hydrogen production through photochemical water splitting in the process uses TiO2 semiconductor material as a photocatalyst. This research has been synthesized and characterized TiO2 and TiO2 photocatalysts doped with Zn metal to reduce the band gap. TiO2 has an anatase crystal structure with an average particle size of 27,07 nm. TiO2 band gap is 3,27 eV.  Then doping with Zn metal and causes the band gap energy to decrease to 3,20 eV. Metal doping is proven to reduce the band gap energy of TiO2 semiconductor photocatalyst.
Sintesis dan Karakterisasi Fotokatalis TiO2/Zn dengan Asam Askorbat Sebagai Reduktor Anastasya, Wulanda; Suryani, Okta
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.v13i3.125853

Abstract

Hydrogen gas (H2) is a promising alternative energy source compared to fossil fuels because it is abundant, highly efficient, non-toxic, and produces no harmful emissions when used as fuel. H2 gas can be produced with a simple, inexpensive, and environmentally friendly process, for example through photocatalytic water splitting by photocatalysts with the help of sunlight. One of the semiconductors as a photocatalyst can absorb sunlight for photocatalytic water splitting is TiO2. In this study, TiO2 has been synthesized whose morphological structure has been modified (Hierarchical Porous TiO2) and doped with Zn metal to reduce the band gap. Hierarchical Porous TiO2 (HPT) has been successfully synthesized. XRD characterization was used  to determine the structure and particle size. HPT has an anatase crystal structure with an average particle size of 19.24 nm. HPT has an energy band gap of  3.25 eV. Then doping with Zn metal reduce the band gap to 2.91 eV. Metal doping is proven to be able to increase the light absorption of HPT from 300 nm to 600 nm in the visible light region. Characterization results show that Zn doping is able to reduce the band gap of HPT semiconductor photocatalyst.
Sintesis dan Karakterisasi Silika Berpori dari Natrium Silikat dan Gelatin dari Kulit Ikan Lele Clarias gariepinus sebagai Surfaktan Zahran, Jihan Fadhilah; Aini, Syamsi; Riga, Riga; Suryani, Okta
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.v13i3.125705

Abstract

Previous research result on porous silics have obtained fine silica precipitate with a purity of 70,6% and a partticle size of 300-1000 nm. As the application of porous silica increases, research is also developing, one example is mesoporous silica. Mesoporous silica can be used in various fields such as catalysts, drug delivery, adsorption, chromatography and others. This research was conducted to synthesize silica with catfish skin gelatin surfactant. Gelatin was characterized by FTIR to see the functional groups that make up gelatin. The resulting silica was characterized using XRD to determine the crystal structure and SEM to determine the morphology of the silica. The results of the FTIR test on catfish skin gelatin showed 4 absorption areas, namely Amide A, Amide I, Amide II and Amide III. Silica characterization using XRD shows crystalline crystals. Meanwhile, SEM characterization shows regular morphology. SL4% has the highest crystallinity and branched tube shape morphology.
Co-Authors Ahadul Putra Aini, Faiza Qurrata Aini, Faizah Qurrata Aini, Syamsi Akhmad, Ashta Varan Akila, Alya Akmar, Reza Amien, Nurkholishah Anastasya, Wulanda Andromeda Annisa, Ananda Suci Aprilia Susanti, Aprilia Arief Muttaqiin Arrum Permata S. Tuti Aviva Alamanda Batu Bara, Humairoh Azhari Benti Etika, Sri Berlianda, Anisa Chatarina Umbul Wahyuni Dafista, Nara Damiyanti, Damiyanti Darussalam, Rahni Della Rosalynna Stiadi Desy Kurniawati Edi Nasra Ezra Delfianza Fahira, Ade Irma Fajri Ikhsan Fallahu Fauzan Fauziah, Tasya Feliska Amanda Fitri Amelia Fitria Ningsih, Rahmadhani Hakim, Lara Azzahra Hamsil, Fatia Hapzi Ali Harahap, Aprilia Silviani Hardeli Hardeli Hardeli Haris Prayudha Setyawan Herianto Ifan Rivaldo Ilham Fauzi Imelda, Fitria Indang Dewata Insani, Munadia Intan Nofita Sari, Intan Nofita Irma Fahira, Ade Iryani Iryani Ismail, Irfan Ananda Iswendi iswendi Jasmine, Nalisha Jayawarsa, A.A. Ketut Katonnia, Eka Putri Khairani Novia Kiki Amelia, Kiki Lailatul Rahmi Lazaro Sofian Arif Lendarwati, Yana Maharani, Mellysa Maida, Margarita Claudya Mardhiyatul Khairat Mawardi Mawardi Mawardi Mawardi Mawardi Mawardi Mawardi Mawardi Mawardi Mawardi Mawardi Mawardi Mawardi Mawardi Mawardi Mawardi Melati Alicia Firdaus Miftahul Khair Mulyanti Mulyanti Naibaho, Sriwahyuni Nizar, Umar Kalmar Nofri Yuhelman Nurisa, Sindya Rahmatul Pangestuti, Annisa Dewi Parbuntari, Hesty Pebrianti, Puji Putra, Ahadul Putri, Wiandi Melati Raden Mohamad Herdian Bhakti Rahimmah, Nur Rahmad, Nafisah Yulia Rahmadhani, Melia Rahmi Fadila Rahmi, Zulfiyanti Ramadhan, Muhammad Arvito Ramdhani, Amelia Restu Ananda Reza Akmar Reza Akmar Riga Riga Riga, Riga Rismi Verawati Rizal, Putri Nadia Romy Dwipa Yamesa Away Ruri Januarita Santia, Andini Sari, Melinda Sari, Trisna Kumala Sembiring, Rinawati Sofyan, Mega Sonnya Camelia Suci Sukmawati Syawal, M Ichlas Ulianas, Alizar Velly, Aglin Verawati, Rismi Vika Aumi Yana Lendarwati Yeni, Isra Yerimadesi Yulinda Sari Z, Martias Zahran, Jihan Fadhilah Zonalia Fitriza