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All Journal Tamaddun: Jurnal Kebudayaan dan Sastra Islam Al-Fathin: Jurnal Bahasa dan Sastra Arab Indonesian Journal of Cultural and Community Development Bidik : Jurnal Pengabdian kepada Masyarakat Jurnal Ilmiah Pendidikan Dasar (JIPDAS) Jurnal Keperawatan 'Aisyiyah Kitabina: Jurnal Bahasa dan Sastra Arab Journal of Arabic Language and Literature Studies Environmental and Materials Smart Humanity: Jurnal Pengabdian Masyarakat
Rahmawati, Isnaini
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Journal : Environmental and Materials

 1 
Carbon-coated nickel foam for hypochlorous acid sensor Sanjaya, Afiten Rahmin; Riyanto, Hanzhola Gusman; Rahmawati, Isnaini; Putri, Yulia Mariana Tesa Ayudia; Nurhalimah, Dede; Saepudin, Endang; Tesla, Yudistira; Krisnandi, Yuni Krisyuningsih
Environmental and Materials Vol. 1 No. 1: (June) 2023
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/eam.v1i1.2023.105

Abstract

The electrochemical detection method of hypochlorous acid (HOCl) using carbon foam electrodes have been successfully developed. The carbon foam was prepared from carbon-coated nickel foam which is synthesized using a hydrothermal-carbonization method. SEM characterization indicated that the optimum synthesis of carbon-coated nickel foam has been achieved on the 4th layer coating process with an expected spherical structure, while characterization using FTIR and Raman spectroscopy confirmed the formation of graphitic material with D band and G band characteristics. An electroactive surface area of ​​0.0236 cm2 was achieved. Cyclic voltammetry of HOCl in 0.1 M phosphate buffer solution pH 6.0 showed the best current response for HOCl reduction occurs at a potential of -0.3 V (vs. Ag/AgCl). Further detection of HOCl using amperometry technique in the concentration range of 2-200 μg/mL showed good linearity with sensitivity of 9.112 mA/µg/L and an estimated detection limit of 1.96 µg/mL. Good repetition is indicated by the RSD value of 2.499 % (n=5). This developed sensor also showed good selectivity in the presence of interference compounds, such as FeCl2 and CuSO4. Besides, the determination of HOCl in tap water has been successfully conducted and generated a comparable result with the UV-VIS method (3.30 µg/mL hypochlorite). The results indicated that the developed sensor is promising for the detection of HOCl in environmental applications.
Synthesis and characterization silica-MB@GO-NH2 particle as fluorescence-based chlorine sensor Fatah, Fadhlir Rahman Aufar Al; Rahmawati, Isnaini; Gunlazuardi, Jarnuzi; Sanjaya, Afiten Rahmin
Environmental and Materials Vol. 1 No. 2: (December) 2023
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/eam.v1i2.2023.399

Abstract

In this research, we developed a fluorescence-based sensor to determine the sodium hypochlorite concentration (NaOCl) in tap water and swimming pool water samples. The detection of NaOCl was conducted by measuring the luminescence response of analyte in the paper-based sensor modified Silica-MB@GO-NH2 material were synthesized using Hummer's and Stober's methods under UV Light irradiation. Additionally, the prepared material exposed a couple peak 2D and 2G at 2938 cm-1 and 3286 cm-1 with ID/IG ratio 0.98 using Raman characterization which appropriate with the presence of GO structure in the mixture. This result was validated by the appearance of several functional groups like Si-O-Si, NH, OH, and C-C at 1079, 1391, 1611, and 3457 cm-1, respectively. Moreover, the existence of Si-O-Si bond indicates that the silica-MB interaction was perfectly formed, which plays the main role to absorb ultraviolet light that is used as sensor probe. The morphology of particles depicted an aggregated formation of spherical structure with 288 nm particle size, indicating the existence of silica-coated methylene blue. In this work, the paper-based sensor modified Silica-MB@GO-NH2 can detect the NaOCl species with concentration range 10-150 µM (R2 = 0.9757), a detection limit at 2.60 µM and quantification limit at 7.88 µM. Furthermore, this developed sensor has stable measurement with recovery performance 3.65%-6.67% for tap water and 0.05%–0.14% for swimming pool water. This result indicates that the prepared sensor can be potentially applied to calculate the hypochlorite species in the aquatic environment.
Preliminary study of screen–printed gold electrode for H2O2 sensor based on electrochemiluminescence of luminol Syukur, Junjunan Muhammad; Sanjaya, Afiten Rahmin; Rahmawati, Isnaini; Ridwan, Muhammad
Environmental and Materials Vol. 3 No. 1: (June) 2025
Publisher : Institute for Advanced Science, Social, and Sustainable Future

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61511/eam.v3i1.2025.1656

Abstract

Background: Hydrogen peroxide (H2O2) is mostly used in the water and dairy industries for sterilization and preservation purposes. However, excessive H2O2 residues in milk and tap water pose a health risk. Therefore, accurate measurement of H2O2 residue is essential.  Methods: This study explores the potential of a screen–printed gold electrode (SPGE) as a sensor for H2O2 sensor using the electrogenerated chemiluminescence (ECL) method of luminol in the electrolyte of phosphate buffer solution (PBS) under alkaline condition (pH of 9). Findings: The detection of H2O2 was achieved a linear calibration equation of y = 0.0215[H2O2] + 0.2006 within a concentration range of 0.5 to 200 µM (R2 = 0.9998), demonstrating reliable ECL measurements.  Conclusion: The analytical performance evaluation of H2O2 sensor exhibited a low limit of detection (LOD) of 3.06 µM, a limit of quantification (LOQ) of 10.20 µM, and good measurement repeatability, with a relative standard deviation (%RSD) of 6.03%, which is below ⅔ of the Horwitz coefficient of variation (9.85%). Unmodified SPGE offers simplicity, ease of use, a stable surface, and good conductivity while maintaining excellent performance. Novelty/Originality of this article: The application of the ECL method on SPGE for H2O2 detection offers excellent analytical performance, making it a promising approach for monitoring H2O2 residues in the water and dairy industries, with a recovery from 83.83 to 106.01%.
Co-Authors Abiya Zahra, Mutiara Permaisuri Aini, Risa Nur Alfarizi, Abdul Khakim Anam, Faqihul Choironi, Merry Cindy Taqiyananda, Restu Endang Saepudin, Endang Fajjri Misabna, Hanifah Fatah, Fadhlir Rahman Aufar Al Fatchurrahman, Fatchurrahman Fitrianingrum, Cherly Hanzhola Gusman Riyanto Huwaida, Naura Ikhlas, Tarishah Fatihah Ita Rodiah, Ita Jarnuzi Gunlazuardi Lestari, Merry M, Oeley M. Yogi Riyantama Isjoni Misroni Muhammad Ridwan Muhammad Walidin Na’immaturrohmah, Mar’ah Nisa’, Irma Khoirun Nurhalimah, Dede Nurul ’Ilmi Azizah, Annafi Prasedia, Titik Putri, Yulia Mariana Tesa Ayudia R, Zuwaroh K. Rofiqoh, Yusnia I’anatur Sandra, Bella Sanjaya, Afiten Rahmin Syahria, Lailatus Syukur, Junjunan Muhammad Tesla, Yudistira Triyani, Ebet Ulil Albab Yuni Krisyuningsih Krisnandi, Yuni Krisyuningsih