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All Journal Journal Of Research and Education Chemistry (JREC) MASALIQ: Jurnal Pendidikan dan Sains
Trisna Kumala Sari
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Religion Chemical Engineering, Chemistry & Bioengineering Chemistry Education Social Sciences

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Pencil Lead Electrode Termodifikasi Lapisan Tipis Perak Untuk Deteksi Ion Logam Cd2+ Dengan Metode Voltammetri Fadiah; Trisna Kumala Sari
Journal of Research and Education Chemistry Vol. 6 No. 2 (2024): Oktober
Publisher : UIR Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jrec.2024.vol6(2).18661

Abstract

Cd2+ metal ions are contaminants that threaten the environment and human health. The purpose of the study is to study the electrochemical responses of PLE and Ag/PLE to detect Cd2+ metal ions, as well as to determine the best supporting electrolyte condition for measuring Cd2+ ions. The cyclic voltometric method is used to modify the electrodes by depositing a thin layer of silver. The results of the study show that Ag/PLE is better for detecting Cd2+ ions compared to PLE. The optimum conditions were obtained with a supporting electrolyte of acetate buffer pH 4.
Pengaruh Supporting Electrolyte terhadap Deteksi Ion Logam Pb(II) dan Cu(II) menggunakan PLE Termodifikasi Lapisan Tipis Perak dengan Metode Voltammetri Sisri Wartati; Trisna Kumala Sari
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 Fatimah As Sarah; Trisna Kumala Sari
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 Mutiara Permatasari; Trisna Kumala Sari
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
Sintesis dan Karakterisasi ZnO/Co dengan Aditif Diethanolamine (DEA) dan Uji Aktivitas Katalitiknya pada Zat Warna Congo Red Mutiara Oktaviani; Hary Sanjaya; Trisna Kumala Sari; Riga Riga
MASALIQ Vol 6 No 2 (2026): MARET
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i2.9232

Abstract

Congo red is an azo dye widely used in the textile industry; however, its wastewater poses serious environmental problems because it is toxic to aquatic organisms, potentially carcinogenic, causes turbidity, and is difficult to degrade naturally. This study aimed to synthesize cobalt-doped ZnO nanoparticles with the addition of diethanolamine (DEA) as an additive to reduce the ZnO bandgap energy and to evaluate their photocatalytic activity in degrading Congo red dye. The material was synthesized using a sol–gel method with Co doping concentrations of 5%, 10%, 15%, 20%, and 25%, and DEA additions of 1 mL, 2 mL, and 3 mL, respectively. The optical properties were characterized using UV-DRS spectroscopy in the wavelength range of 185–1100 nm, and the bandgap energy was calculated using the Kubelka–Munk equation. Photocatalytic activity tests on Congo red were carried out under visible light (sunlight) and UV irradiation, with monitoring using UV–Vis spectrophotometry at a maximum wavelength of 498 nm. The results showed that the addition of 20% Co doping reduced the ZnO bandgap energy from 3.20 eV to 1.76 eV, and the combination of 20% Co doping with 2 mL DEA produced an optimum bandgap of 1.68 eV. Photocatalytic tests indicated that ZnO/Co 20% with 2 mL DEA exhibited the highest activity, with Congo red degradation percentages of 98.63% under visible light and 98.57% under UV light within 120 minutes of irradiation. These findings demonstrate that cobalt-doped ZnO nanoparticles with DEA as an additive can enhance the photocatalytic activity of ZnO and have potential application as a photocatalyst-based solution for the treatment of textile dye wastewater.
In Silico Senyawa Bioaktif Tanaman Obat Indonesia sebagai Inhibitor Xanthine Oxidase melalui Pendekatan Molecular Docking dan ADMET Shalsa Fitria Zanti; Trisna Kumala Sari
MASALIQ Vol 6 No 3 (2026): MEI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/masaliq.v6i3.9662

Abstract

Xanthine oxidase (XO) plays a role in the formation of uric acid and contributes to hyperuricemia, whereas the use of synthetic inhibitors such as allopurinol is known to have side effects, thus requiring alternatives from the bioactive compounds of medicinal plants. This study aims to evaluate the potential of Dillapiole, Piperine, Hydroxychavicol, Panduratin A, and Isolicoflavonol as XO inhibitors through an in silico approach using molecular docking, as well as Lipinski and ADMET analyses. The results showed that most ligands met the drug-likeness criteria, except for Panduratin A, which had one violation of LogP. All ligands showed negative binding affinity, with Isolicoflavonol having the best affinity (−9.5 kcal/mol), followed by Piperine and Panduratin A. ADMET predictions showed that most ligands had good absorption and were not mutagenic, although some ligands had the potential to interact with CYP450 enzymes. Overall, Isolicoflavonol showed the best potential as an XO inhibitor candidate based on binding affinity and ADMET profile. These findings affirm the potential of medicinal plant bioactive compounds as alternative XO inhibitors, although further in vitro and in vivo testing is still needed for further validation.
Co-Authors FADIAH Fatimah As Sarah Hary Sanjaya Mutiara Oktaviani Mutiara Permatasari Riga Riga Shalsa Fitria Zanti Sisri Wartati