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All Journal Jurnal Periodic Jurusan Kimia UNP Journal of Natural Sciences and Mathematics Research Jurnal Zarah 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.
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
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.
The Chemistry Teacher Activities on The Training of Project Based Learning Teaching Materials Digitalisation Suryani, Okta; Sari, Trisna Kumala; Riga, Riga; Mawardi, Mawardi; Yuhelman, Nofri; Nasra, Edi; Velly, Aglin; Rahmad, Nafisah Yulia
Hydrogen: Jurnal Kependidikan Kimia Vol. 12 No. 6 (2024): December 2024
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/hjkk.v12i6.13495

Abstract

This activity is the second year of community service which is a continuation of training activities and making digital teaching materials to support project-based learning (PjBL) in sekolah penggerak for chemistry teachers in Padang city. This second year of community service activities has the theme of training to digitise project-based learning teaching materials developed at the Chemistry Musyawarah Guru Mata Pelajaran (MGMP) in Padang city. This activity aims to provide direction to Padang city chemistry teachers in implementing digital teaching materials. This community service was carried out in the lecture building of FMIPA Universitas Negeri Padang on 9 August, 16 August, and 23 August 2024. The implementation methods carried out in this community service activity are: (1) conducting a needs analysis, knowing the situation of teachers towards the implementation of PjBL-based learning through questionnaires distributed, (2) delivering material to community service participants related to PjBL and an overview of teaching materials that have been designed using the PjBL learning model explained by the speaker, then (3) delivery of materials and discussions related to differentiated learning with the PJBl learning model, and (4) delivering material related to the digitalisation of project-based teaching materials or PjBL using liveworksheet. The results of the service activities carried out can provide motivation, provide experience, and understanding for Padang city chemistry teachers regarding the digitalisation of project-based learning teaching materials so that chemistry teachers in Padang city can prepare digital chemistry teaching materials, especially with liveworksheets using the PjBL model that can assist learning activities so that learning can run effectively and efficiently in accordance with the demands of the curriculum and the times.
Utilization of Nephelium lappaceum (Rambutan) waste as biosorbent for heavy metals and dyes: a review Rahmadani, Suci; Putra, Rizky Zalmi; Sari, Trisna Kumala; Away, Romy Dwipa Yamesa
Journal of Natural Sciences and Mathematics Research Vol. 9 No. 2 (2023): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pollution of environmental streams and ecosystems is rising. One of the sources of water contamination is the wastewater from the textile, plastics, and mining sectors, which contains both organic and inorganic pollutants. Heavy metals and dyes in wastewater must be treated before disposal to protect the aquatic environment and human health. Due to its effectiveness, low cost, and simplicity of use, biosorption has emerged as a wastewater treatment option. Rambutan waste, in particular, is promising for commercial usage due to its extensive availability and efficiency. In this article, we review the usage of natural rambutan peels, seeds, leaves, and stems for the biosorption of water contaminants. We discuss the factors that influence pollutant removal. A pH of 6 to 12 is advantageous for cationic pollutant removal, whereas a pH of less than 5 is appropriate for anionic pollutant removal. More significant concentrations of pollutants generally result in lesser removal, whereas higher doses of biosorbent result in higher removal. The ideal adsorption contact time for rambutan peels and seeds was less than an hour. We also discuss the isotherms of the adsorption process.
Co-Authors Ahadul Putra Aini, Syamsi Akhmad, Ashta Varan Alizar, Alizar Annisa, Ananda Suci Baehaqi Budhi Oktavia Della Rosalynna Stiadi Desy Kurniawati Edi Nasra Fajriah Azra Fithriana, Elinda Indang Dewata Istiqamah, Siti Sarah Jannah, Mizatul Jayawarsa, A.A. Ketut Jeningsih Kauri, Desrike Luthfiyah, Lulu Maharani, Indah Kemala Malinda, Tasya Miftahul Khair Mulia, Melindra Nizar, Umar Kalmar Nofri Yuhelman Paradhise, Cleofany Aurhelya 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 Saddam Husein, Saddam Septian Budiman Sherly Kasuma Warda Ningsih Sri Benti Etika Suryani, Okta Ulianas, Alizar Velly, Aglin Waarsyat, Fadli Wahyu Hidayati Yeni, Isra yuda pratama Zubir, Moondra