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All Journal Jurnal Periodic Jurusan Kimia UNP Journal of Natural Sciences and Mathematics Research Eksakta : Berkala Ilmiah Bidang MIPA Pelita Eksakta SPIN: Jurnal Kimia & Pendidikan Kimia Hydrogen: Jurnal Kependidikan Kimia Jurnal Pijar MIPA MASALIQ: Jurnal Pendidikan dan Sains
Sari, Trisna Kumala
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Religion Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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Implementation of Sekolah Penggerak Programme to Address Chemistry Teachers Competency on Design PjBL-based Digital Teaching Materials in Padang Suryani, Okta; Sari, Trisna Kumala; Riga, Riga; Mawardi, Mawardi; Putra, Ahadul
Hydrogen: Jurnal Kependidikan Kimia Vol 12, No 5 (2024): October 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i5.12952

Abstract

Teaching materials for Sekolah Penggerak should be prepared based on a creative thinking learning model such as project-based learning (PjBL). However, based on the needs and situation of teachers towards the implementation of PjBL-based learning, implementation of PjBL in learning is still low, since the teachers in Padang need the advance training of preparation in PjBL learning material. The Community service activities have been carried out to provide experienced chemistry teachers in developing teaching materials based on Project-Based Learning. The implementation methods carried out in this activity are: (1) Analyzing the needs and situation of teachers towards the implementation of PjBL-based learning through questionnaires distributed, (2) Submission of material to service participants related to the PjBL learning model and syntax in this learning model explained by the speaker, then (3) Teachers are given the task of compiling and designing chemistry LKPDs using the PjBL model, (4) Teachers will present the results of the LKPD design compiled, and (5) evaluation of activities. The results of the service activities carried out can provide experience and understanding for chemistry teachers in Padang city regarding the PjBL learning model. Participants who attended this service activity could prepare chemistry teaching materials using the PjBL model so that teachers could be more innovative and creative. This activity service can provide motivation for teachers to prepare teaching materials in accordance with the demands of the Kurikulum Merdeka, especially in the implementation of project-based learning.
Pencil Lead Electrode Modified with Gold Thin Layer for Voltammetric Detection of Chromium (VI) Sari, Trisna Kumala; Riga, Riga; Zubir, Moondra
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 22 No. 2 (2021): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (759.742 KB) | DOI: 10.24036/eksakta/vol22-iss2/265

Abstract

Cr(VI) is a toxic, mutagenic, and carcinogenic metal. This heavy metal have effect harmful on organism and the environment. In this study, an electroanalytic approach was improved for detection of the Cr(VI) using a pencil lead electrode modified with gold thin layer by cyclic voltammetry. Gold thin layer was electrodeposited on the pencil lead electrode surface with potential-sweeping technique at scan of potential from 1.2 V to 0 V. Since the Cr(VI) species depends on the pH, effect of supporting electrolytes matrix at various pH were investigated. It was found that Cr(VI) gave a reduction peak with a peak potential of 0.35 V vs Ag/AgCl in cyclic voltammogram with 0.1M HClO4 as supporting electrolyte. The calibration curve for Cr(VI) at gold thin layer modified pencil lead electrode shows linearity in range of 5 µM to 100 µM with a detection limit of 2.3 µM achieved.
POTENTIAL OF BAMBOO POWDER AS AN ADSORBENT TO REGENERATE USED COOKING OIL Wulandari, Putri; Luthfiyah, Lulu; Jannah, Mizatul; Hidayati, Wahyu; Away, Romy Dwipa Yamesa; Sari, Trisna Kumala
SPIN JURNAL KIMIA & PENDIDIKAN KIMIA Vol. 7 No. 1 (2025): January - June 2025
Publisher : UIN Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20414/spin.v7i1.13442

Abstract

Penelitian ini mengevaluasi efektivitas bubuk bambu yang diolah menjadi karbon aktif untuk meregenerasi minyak jelantah menggunakan tiga metode: tanpa perlakuan panas tinggi, aktivasi konvensional, dan aktivasi furnace. Aktivasi dengan KOH meningkatkan porositas dan luas permukaan. Parameter utama yang dianalisis meliputi kadar air, asam lemak bebas (FFA), dan bilangan peroksida (PV). Hasil penelitian menunjukkan bahwa arang aktif metode furnace memiliki kinerja terbaik, menghasilkan kadar air 0,05%, memenuhi SNI 7709:2019 (< 0,1 %). Sebaliknya metode konvensional dan serbuk bambu menghasilkan kadar air masing-masing sebesar 0,12% dan 0,66%. Kandungan FFA terendah sebesar 0,23 % juga terdapat pada arang aktif tungku memenuhi SNI 01-3741 2002 (<0,3%). Selain itu, bilangan peroksida yang dihasilkan arang aktif dengan metode furnace adalah 6,3 mek O2/kg, lebih baik dibandingkan metode konvensional (9,7 mek O2/kg) dan bubuk bambu (13,3 mek O2/kg), keduanya memenuhi SNI No. 01-3741-2013 (< mek 10 O2/kg). Kinerja arang aktif dengan metode furnace unggul disebabkan oleh porositasnya yang optimal, peningkatan kandungan karbon aktif, sifat hidrofobik, dan kemampuan interaksi dengan pengotor. Oleh karena itu, arang bambu yang diaktifkan dengan metode furnace menunjukkan potensi sebagai adsorben yang efektif untuk meregenerasi minyak jelantah.   This research evaluates the effectiveness of bamboo powder processed into activated carbon for regenerating used cooking oil using three methods: no high heat treatment, conventional activation, and furnace activation. The activation with KOH enhances porosity and surface area. Key parameters analyzed included water content, free fatty acids (FFA), and peroxide value (PV). The results indicated that furnace-activated charcoal performed best, yielding an oil content of 0.05%, which is compliant with SNI 7709:2019 (<0.1%). In contrast, conventional and bamboo powder methods produced water contents of 0.12% and 0.66%, respectively. The lowest FFA content of 0.23% was found in the furnace-activated charcoal, which meets the SNI 01-3741-2002 standard (<0.3%). Additionally, the peroxide value was 6.3 meq O2/kg, which is lower than the conventional method (9.7 meq O2/kg) and bamboo powder (13.3 meq O2/kg), both of which meet SNI No. 01-3741-2013 (<10 meq O2/kg). The furnace-activated charcoal's superior performance is attributed to its optimal porosity, increased active carbon content, hydrophobic properties, and interaction capabilities with impurities. Thus, furnace-activated bamboo charcoal shows promise as an effective adsorbent for regenerating used cooking oil.
Pengaruh Ukuran Partikel Kulit Lengkeng (Dimocarpus longan) yang Termodifikasi CTAB Terhadap Adsorpsi Ion Logam Pb(II) Putri Rinjani, Mitna Sekar; Kurniawati, Desy; Alizar, Alizar; Sari, Trisna Kumala
Periodic Vol 14, No 2 (2025): PERIODIC
Publisher : Departemen Kimia FMIPA UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/periodic.v14i2.132982

Abstract

Study This aiming For analyze material characteristics using Spectroscopy Infrared Fourier Transform (FT-IR) and measure size particle . The FT-IR method is used For identify group function And component chemistry in sample , while analysis size particle done For determine distribution And morphology particle . Objective study This is For increase efficiency adsorption through modification surface biosorbent using CTAB. FT-IR results show existence peaks spectrum indicating existence bond chemistry certain , which provides outlook about material structure . Capacity maximum obtained at pH 6, concentration 250 ppm, time 60 minutes contact , and size 180 µm particles . research This show that peel modified longan with CTAB having potential tall For used as biosorbent effective in processing waste metal heavy.
Pengaruh Supporting Electrolyte terhadap Deteksi Ion Logam Cr(VI) Menggunakan PLE Termodifikasi Lapisan Tipis Perak dengan Metode Voltammetri Putri, Nella Aulia; Sari, Trisna Kumala
MASALIQ Vol 5 No 3 (2025): MEI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i3.5508

Abstract

Chromium (VI) ions are recognized for their toxicity, mutagenicity, and carcinogenic properties, posing significant risks to both human health and the environment. This study aims to optimize the conditions of supporting electrolytes for the electrochemical detection of Cr(VI) ions using a Pencil Lead Electrode (PLE) modified with a thin layer of silver (Ag/PLE). Employing cyclic voltammetry, we investigated the modification of the PLE and analyzed the effects of varying supporting electrolytes on the detection sensitivity of Cr(VI) ions. Our findings indicate that a 0.1 M HNO3 solution serves as the optimal supporting electrolyte, with oxidation and reduction potentials recorded at +1.4287 V and +0.3906 V, respectively. The observed differences in the sensitivity of Cr(VI) detection can be attributed to the varying diffusion rates of the analyte across the electrode surface. This study presents a straightforward, sensitive, and cost-effective electrochemical method for detecting Cr(VI) ions, offering significant implications for environmental monitoring and public health safety. By enhancing detection methodologies, this research contributes to the broader discourse on mitigating the adverse effects of hazardous metal ions in ecological systems.
Pengaruh Variasi Pencil Lead Electrode (PLE) terhadap Deteksi Ion Logam Pb (II) menggunakan Modifikasi MnO2 Metode Voltametri Siklik Wahyuni, Rahmi; Sari, Trisna Kumala
MASALIQ Vol 5 No 3 (2025): MEI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i3.5804

Abstract

This study is motivated by the limited research on modified pencil lead electrodes in electrochemical detection, despite their significant potential as simple, low-cost, and environmentally friendly heavy metal sensors. The aim of this research is to evaluate the performance of MnO₂/pencil lead electrode (MnO₂/PLE) with variations in pencil hardness—2B, B, and HB—in detecting K₃[Fe(CN)₆] and Pb²⁺ ions using cyclic voltammetry. The electrodes were modified using the drop-casting method, and voltammogram data were analyzed based on current and redox potential values. The results show that MnO₂/PLE (2B) demonstrated the best performance among the variants. This is attributed to the synergy between the electrocatalytic properties of MnO₂ and the high graphite content of the 2B pencil, which enhances conductivity and electrochemical response. MnO₂/PLE (2B) proved effective in detecting Pb²⁺ ions, making it a strong candidate for use as an electrochemical heavy metal sensor. The implications of this study contribute to the literature on modified carbon-based sensors and open opportunities for the development of portable, low-cost sensors for environmental monitoring.
Pengaruh Supporting Electrolyte terhadap Deteksi Ion Logam Pb(II) dan Cu(II) menggunakan PLE Termodifikasi Lapisan Tipis Perak dengan Metode Voltammetri Wartati, Sisri; Sari, Trisna Kumala
MASALIQ Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i4.6738

Abstract

This study aims to evaluate the effect of different supporting electrolytes on the detection sensitivity of Pb(II) and Cu(II) ions simultaneously using a Pencil Lead Electrode (PLE) modified with a thin silver layer via electrodeposition. The modification was carried out using a 5 mM AgNO₃ solution in 0.1 M KNO₃ through cyclic voltammetry, producing reduction and oxidation peaks at +0.2256 V and +0.5253 V, respectively, indicating successful silver deposition on the electrode surface. The supporting electrolyte variations included 0.1 M solutions of HNO₃, H₂SO₄, and HClO₄, tested for 1 mM Pb(II) and Cu(II) ion analysis. The voltammogram results showed that 0.1 M HNO₃ yielded the highest current responses 1.3550 mA for Pb(II) and 1.3305 mA for Cu(II) making it the most optimal supporting electrolyte. These differences are attributed to the ionic mobility and diffusion rate of the species toward the electrode surface. The findings demonstrate that the choice of supporting electrolyte significantly influences the performance of electrochemical sensors. This research contributes to the development of efficient, cost-effective, and sensitive PLE-based sensors for simultaneous heavy metal detection.
Pengaruh Supporting Electrolyte untuk Deteksi Ion Logam Cd(II) dan Zn(II) menggunakan PLE Termodifikasi Lapisan Tipis Perak dengan Metode Voltametri Sarah, Fatimah As; Sari, Trisna Kumala
MASALIQ Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i4.6847

Abstract

Cd(II) and Zn(II) metal ions are toxic environmental contaminants that pose potential risks to human health, necessitating accurate and efficient detection methods. This study aims to optimize the supporting electrolyte conditions for the simultaneous electrochemical detection of Cd(II) and Zn(II) ions using a Pencil Lead Electrode (PLE) modified with a thin silver layer (Ag/PLE). Cyclic voltammetry was employed to evaluate the effectiveness of electrode modification and the influence of electrolyte variation on the detection sensitivity of both metal ions. Experimental results indicate that 0.1 M acetate buffer is the optimal supporting electrolyte, yielding an anodic potential (Epa) of –0.37 V and a peak current of 1.48 mA, as well as a cathodic potential (Epc) of –0.9140 V for Cd(II). For Zn(II), the Epa was observed at –0.79 V with a current of 0.54 mA and Epc at –0.6790 V. The difference in detection sensitivity between the two metal ions is attributed to variations in analyte diffusion rates at the electrode surface. These findings demonstrate that the Ag/PLE-based electrochemical approach offers a simple, sensitive, and cost-effective method for the simultaneous detection of heavy metal ions, contributing significantly to rapid and practical environmental monitoring systems.
Pengaruh Variasi Pencil Lead Electrode (PLE) terhadap Deteksi Ion Logam Cu²⁺ menggunakan Modifikasi MnO₂ dengan Metode Voltametri Siklik Permatasari, Mutiara; Sari, Trisna Kumala
MASALIQ Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v5i4.6859

Abstract

This study is motivated by the limited research on the use of modified pencil lead electrodes in electrochemical detection, despite their advantages as simple, low-cost, environmentally friendly, and highly sensitive heavy metal sensors. Copper ions (Cu²⁺) are essential elements for biological functions, but in excessive amounts, they become toxic and can damage vital organs such as the liver and kidneys. The aim of this research is to develop an effective electrochemical sensor for detecting Cu²⁺ ions by optimizing the type and modification of pencil lead electrodes. Electrode modification was performed using the drop-casting method with manganese dioxide (MnO₂) on three pencil hardness grades (2B, B, and HB), with voltammogram analysis based on the resulting current and redox potential. The results indicate that the MnO₂/PLE (2B) electrode demonstrated the most optimal performance compared to the other variations. This advantage is attributed to the electrocatalytic properties of MnO₂ and the higher graphite content in 2B pencils, which enhance the electrode’s conductivity and electrochemical response. These findings confirm that MnO₂/PLE (2B) is effective for Cu²⁺ ion detection and holds potential for development as an efficient electrochemical sensor for heavy metal analysis. Keywords: Cu²⁺ Ion; MnO₂; Pencil Electrode; Cyclic Voltammetry; Electrochemical Sensor
Processing Trash Fish into Economically Valuable Animal Feed in Nagari Pilubang, Padang Pariaman Regency Sari, Trisna Kumala; Away, Romy Dwipa Yamesa; Suryani, Okta; Yeni, Isra; Aini, Syamsi; Kurniawati, Desy; Nasra, Edi; Stiadi, Della Rosalynna
Pelita Eksakta Vol 7 No 1 (2024): Pelita Eksakta, Vol. 7, No. 1
Publisher : Fakultas MIPA Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/pelitaeksakta/vol7-iss1/221

Abstract

There has been concealed on the processing of trash fish into animal feed in Nagari Pilubang, Padang Pariaman Regency. The majority of the Pilubang community are fishermen. However, so far the trash fish caught have not been processed properly. Meanwhile, trash fish has the potential to be used as animal feed because it contains high protein. Through this PKM activity, the community receives education and training regarding the application of technology for processing trash fish into animal feed using appropriate technology. The animal feed was made from trash fish is processed using a fermentation process. From the results of this activity, it is known that community knowledge has increased and is very useful for implementation by the community in Nagari Pilubang
Co-Authors Ahadul Putra Aini, Syamsi Akhmad, Ashta Varan Alizar, Alizar Annisa, Ananda Suci Budhi Oktavia Della Rosalynna Stiadi Desy Kurniawati Edi Nasra Fajriah Azra Indang Dewata Istiqamah, Siti Sarah Jannah, Mizatul Jayawarsa, A.A. Ketut Kauri, Desrike Luthfiyah, Lulu Maharani, Indah Kemala Malinda, Tasya Mawardi Miftahul Khair Mulia, Melindra Nizar, Umar Kalmar Nofri Yuhelman Permatasari, Mutiara Pernadi, Niza Lian Putra, Ahadul Putra, Ananda Putra, Rizky Zalmi Putri Rinjani, Mitna Sekar PUTRI WULANDARI Putri, Nella Aulia Putri, Yunisa Anugrah Rahmad, Nafisah Yulia Rahmi Wahyuni, Rahmi Rahmi, Maulidia Arsyta Riga, Riga Romy Dwipa Yamesa Away Rosmiyani, Tia Sarah, Fatimah As Sherly Kasuma Warda Ningsih Suryani, Okta Ulianas, Alizar Velly, Aglin Wahyu Hidayati Wartati, Sisri Yeni, Isra yuda pratama Zubir, Moondra