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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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Pengaruh Supporting Electrolyte Pada Penentuan Formaldehida Secara Voltametri Siklik Menggunakan Pencil Lead Electrode (PLE) Modifikasi Lapisan Tipis Perak Putri, Yunisa Anugrah; Sari, Trisna Kumala; Oktavia, Budhi; Nizar, Umar Kalmar
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.v13i1.124516

Abstract

Formaldehyde was detected electrochemically using a pencil lead electrode modified with a thin layer of silver (Ag/PLE). Modification of the silver thin layer was carried out by sweeping-potential electrodeposition using the cyclic voltammetry method. This study aims to study the response of PLE and Ag/PLE for determination of formaldehyde and also to determine the optimum conditions of the supporting electrolyte used in the measurement of formaldehyde. The results showed that Ag/PLE provided better performance than PLE and 0.1 M KOH was the optimum supporting electrolyte. Measurement of formaldehyde using Ag/PLE electrodes with a concentration of 10 mM of test analyte. The oxidation peak of formaldehyde is present at a potential of 0.054 Volt.
Pemanfaatan Karbon dari Bunga Cemara Laut (Casuarina equisetifolia) untuk Penjernihan Minyak Jelantah Rahmi, Maulidia Arsyta; Putra, Ananda; Sari, Trisna Kumala; Pernadi, Niza Lian; Istiqamah, Siti Sarah; Nizar, Umar Kalmar
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.v13i1.124261

Abstract

Used cooking oil is waste oil that has been used many times and is also known as used cooking oil which contains food residue and is a pollutant to the environment. This oil contains free fatty acids, carbonyl compounds, and peroxides. The content contained in used cooking oil can cause poisoning in humans and cause pollution to the environment. This study aims to clarify used cooking oil so that it can be reused. Carbon from sea pine flowers is used as a solution to clarify used cooking oil in this study. BCL carbon was obtained using the calcination method at various temperatures of 250oC, 300oC, 350oC, and 400oC. The resulting carbon is then subjected to a proximate test. Based on the results of the proximate test, the results obtained were in accordance with the SNI 06-3730-1995 standard with the optimum value obtained at 350oC calcination temperature. The clarification of used cooking oil is carried out by mixing used cooking oil and carbon as a result of calcination at 350ºC. Variations in the mass of carbon used are 1,3 and 5 grams. The results showed that the carbon of sea cypress flowers can be used as an absorbent for cleaning used cooking oil which can adsorb its fatty acid content. The optimum absorbent of this study was the 5g CBCL sample. This is evidenced by the results of the analysis that has been carried out with the lowest density value of 0.83 g/mL, the highest flow rate value of 4.312 mL/s and the lowest acid number value of 0.5 mg KOH/g.
Pencil Lead Electrode Modifikasi Lapisan Tipis Emas Untuk Deteksi Formaldehida Secara Voltametri Siklik Malinda, Tasya; Sari, Trisna Kumala; Nasra, Edi; Azra, Fajriah
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.v13i1.124470

Abstract

Formaldehyde is a toxic, carcinogenic, mutagenic and genotoxic compound that can harm the human body. Formaldehyde can threaten human health such as, can cause eye, nose and throat irritation and contact dermatitis on the skin. This research aims to study the response of pencil lead electrode (PLE) and pencil lead electrode (PLE) modification with gold thin layer in the development of formaldehyde sensor by using cyclic voltammetry. The electrode modification was done by potential-sweeping electrodeposition of Au on electrode and known as Au/PLE electrode. The resulting electrode has high conductivity and excellent catalytic activity because it is able to provide a large current response. In this study, the optimum conditions will be determined based on variations supporting electrolyte and cycle gold thin layer electrodeposition. Variations in supporting electrolyte and cycle for gold thin layer electrodeposition on the formaldehyde sensor give different peak current and potential results. KOH 0,1 M  is supporting electrolyte optimum and cycle for gold thin layer electrodeposition optimum is one cycle.
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.
Metode Sol Gel Untuk Mengekstraksi Silika Dari Abu Sekam Padi Rosmiyani, Tia; Sari, Trisna Kumala; Alizar, Alizar; Mulia, Melindra
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.v12i3.118458

Abstract

Rice husk ash (RHA) is a lignocellulosic material such as biomass in other materials that also contain silica. Amorphous silica obtained from rice husk ash is thought to be an important source that can produce silicon carbide, pure silicon and silicon nitride flour. Rice husk ash contains high silica (>60%). Gel silica is ekstracted by adding sodium hydroxide to produce a sodium silicate solution. The silica extraction was carried out by reacting the rice husk ash using 1M NaOH solution at 80°C for 1 hour. Subsequently, it was added 1M HCl to pH 7. Then it was evaporated in an oven at 80°C to constant weight. Based on the results of the FTIR analysis, the absorption peak of silica with a wavelength of 1070.17 cm-1 is similar to the absorption peak of 98% silica with an absorption wavelength of 1054.95 cm-1. The extracted gel silica has an amorphous crystalline form where in the XRD test there is an absorption peak that widens in the range of 2θ = 22
Deteksi Formaldehida Menggunakan Glassy Carbon Electrode (GCE) Modifikasi Lapisan Tipis Emas secara Voltametri Siklik Maharani, Indah Kemala; Sari, Trisna Kumala; Dewata, Indang; Warda Ningsih, Sherly Kasuma; Yamesa Away, Romy Dwipa
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.v13i1.124526

Abstract

The formaldehyde was found as one of the toxic and mutagenic products. Long-term exposure will harm the health of the human body. This study aims to detect formaldehyde developed on an electrochemical sensor using Glassy Carbon Electrode (GCE) modified with a thin layer of gold as the working electrode by cyclic voltammetry. Electrode modification was carried out by electrodeposition of Au potential-sweeping on electrodes known as Au/GCE electrodes. The resulting electrode has high conductivity and excellent catalytic activity because it is able to provide a large peak current response. In this study, the optimum conditions will be determined based on variations in the electrodeposition cycles of gold thin films and variations in the supporting electrolyte. The optimum cycle of gold thin film electrodeposition was obtained, namely one cycle and 0.1 M KOH as the optimum supporting electrolyte. The peak current obtained is sharper, the sensitivity and stability are also better due to the electrocatalytic properties produced by the high gold thin layer.
Optimasi Adsorpsi Ion Mn2+ Pada Silika-GPTMS Dimodifikasi Dengan Sulfonat Pratama, Yuda; Oktavia, Budhi; Khair, Miftahul; Sari, Trisna Kumala
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.v13i2.124517

Abstract

Manganese is one of the heavy metals that can pollute waters. This is caused by the use of pesticides and steel industry waste. Adsorption is one method that can be used to separate manganese metal. The adsorbent that is often used in adsorption is silica gel. However, the effectiveness of silica gel in absorbing heavy metal ions is very low, so modification is needed to increase the absorption capacity of silica gel to heavy metal ions. The purpose of this research is to obtain optimum conditions and sorption capacity of sulfonate-modified Silica-GPTMS in adsorbing Mn2+ ions and its adsorption isotherm. This study used batch method for adsorption process by varying pH and contact time. The results of absorption capacity at the optimum conditions of pH 4 and contact time 30 minutes.
Optimum Condition of Ni2+ Cation Desorption from Adsorbent Sulfonate-modified Silica gel-GPTMS Kauri, Desrike; Oktavia, Budhi; Sari, Trisna Kumala; Khair, Miftahul
Jurnal Pijar Mipa Vol. 19 No. 5 (2024): September 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i5.7448

Abstract

Silica gel is a compound that has two active sides, namely silanol (S-OH) and siloxane (Si-O-Si), which are still less effective as adsorbents, so modification is carried out. Silica is modified by adding sulfonate compounds with the help of GPTMS bridging compounds. This modification aims to improve the absorption capacity of Nickel (Ni2+) metal ions in the modified adsorbent, namely sulfonate-modified silica gel-GPTMS. The characterizations used are SSA (Atomic Absorption Spectrophotometry) to see the success of the adsorption and desorption process. This research is quantitative experimental research where the adsorption and desorption processes are carried out using the column method, where the adsorption process itself is carried out on the Ni2+ cation using silica gel-GPTMS Sulfonate adsorbent at an optimal concentration of 20 ppm and pH 3. Then, we continued with the desorption process, which aims to determine the optimum conditions of the desorption process, including determining the type of desorption agent (NaCl and CaCl2) and concentration for the Ni2+ cation desorption process. Based on the results of the research conducted, the optimum condition of the type of desorption agent is CaCl2 where the desorbed weight is 0.1527 mg, and the per cent desorption is 90.10%, the optimum concentration of CaCl2 is 0.025M with a desorbed weight of 0.1442 mg and a per cent desorption of 90.18%. Based on the experimental results, the sulfonate-modified silica gel-GPTMS adsorbent can still be used repeatedly for adsorption and desorption of Ni2+ cations at optimum conditions.
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.
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 Suci Rahmadani Suryani, Okta Ulianas, Alizar Velly, Aglin Wahyu Hidayati Wartati, Sisri Yeni, Isra yuda pratama Zubir, Moondra