Perbandingan Kinerja Sensor Nitrit Secara Elektrokimia Menggunakan SPCE Termodifikasi Partikel Besi Oksida Hasil Green Synthesis dan Elektrolisis

Albasari, Putri Malata (2026) Perbandingan Kinerja Sensor Nitrit Secara Elektrokimia Menggunakan SPCE Termodifikasi Partikel Besi Oksida Hasil Green Synthesis dan Elektrolisis. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Nitrit (NO₂-) merupakan salah satu senyawa pencemar yang berbahaya bagi kesehatan manusia dan lingkungan sehingga diperlukan metode deteksi yang cepat, sensitif, dan akurat. Penelitian ini bertujuan membandingkan karakteristik partikel besi oksida hasil green synthesis menggunakan ekstrak bunga telang (Clitoria ternatea L.) dan elektrolisis, serta mengevaluasi pengaruhnya terhadap kinerja sensor nitrit berbasis Screen Printed Carbon Electrode (SPCE). Partikel dikarakterisasi menggunakan Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray Spectroscopy (EDX), dan X-ray Diffraction (XRD), kemudian diaplikasikan sebagai material modifikasi SPCE. Kinerja sensor dievaluasi menggunakan teknik cyclic voltammetry (CV) dan amperometri melalui pengujian respon elektrokimia, pengaruh pH, luas permukaan elektroaktif, sensitivitas, limit of detection (LOD), repeatability, dan selektivitas. Hasil karakterisasi menunjukkan bahwa material hasil green synthesis memiliki pola difraksi yang cenderung amorf hingga semikristalin dan memiliki kemiripan dengan Fe(OH)₂, sedangkan material hasil elektrolisis sesuai dengan fase kristalin γ-FeOOH. Modifikasi SPCE menggunakan kedua material meningkatkan respon elektrokimia nitrit dibandingkan SPCE tanpa modifikasi. SPCE/Fe(OH)₂/Nafion memberikan respon optimum pada pH 7, sedangkan SPCE/γ-FeOOH/Nafion pada pH 10. Elektroda SPCE/γ-FeOOH/Nafion menunjukkan performa terbaik dengan sensitivitas sebesar 8,09 μA/mM cm2, nilai LOD sebesar 0,65 mg/L, repeatability sebesar 1,99%, serta selektivitas yang baik terhadap nitrit. Berdasarkan hasil penelitian, metode elektrolisis menghasilkan material γ-FeOOH yang lebih efektif sebagai modifikator SPCE untuk pengembangan sensor elektrokimia nitrit.
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Nitrite (NO₂-) is a hazardous pollutant that poses significant risks to both human health and the environment, highlighting the need for rapid, sensitive, and accurate detection methods. This study aimed to compare the characteristics of iron oxide particles synthesized by green synthesis using Clitoria ternatea L. flower extract and electrolysis, as well as to evaluate their effects on the performance of a nitrite sensor based on a Screen-Printed Carbon Electrode (SPCE). The synthesized nanoparticles were characterized using Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray Spectroscopy (EDX), and X-ray Diffraction (XRD) before being used to modify the SPCE surface. The electrochemical performance of the modified electrodes was evaluated using cyclic voltammetry (CV) and amperometry, including electrochemical response, pH effect, electroactive surface area, sensitivity, limit of detection (LOD), repeatability, and selectivity. The characterization results showed that the material synthesized by the green synthesis method exhibited an amorphous to semicrystalline structure with diffraction patterns similar to Fe(OH)₂, whereas the electrolysis-derived material corresponded to the crystalline γ-FeOOH phase. Both materials enhanced the electrochemical response toward nitrite compared with the bare SPCE. The optimum pH was 7 for the SPCE/Fe(OH)₂/Nafion electrode and 10 for the SPCE/γ-FeOOH/Nafion electrode. Among the fabricated sensors, the SPCE/γ-FeOOH/Nafion electrode exhibited the best analytical performance, with a sensitivity of 8.09 μA/mM cm2, a limit of detection of 0.65 mg/L, a repeatability of 1.99%, and good selectivity toward nitrite. These findings demonstrate that the electrolysis method produces γ-FeOOH with superior properties, making it a more effective modifier for SPCE-based electrochemical nitrite sensors.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	γ-FeOOH, elektrolisis, Fe(OH)2, green synthesis, nitrit, SPCE. γ-FeOOH, electrolysis, Fe(OH)₂, green synthesis, nitrite, SPCE.
Subjects:	Q Science > QD Chemistry Q Science > QD Chemistry > QD1 Oxidation-reduction reaction. Q Science > QD Chemistry > QD115 Electrochemical analysis Q Science > QD Chemistry > QD553 Electrochemistry. Electrolysis
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47201-(S1) Undergraduate Thesis
Depositing User:	Putri Malata Albasari
Date Deposited:	04 Aug 2026 02:07
Last Modified:	04 Aug 2026 02:07
URI:	http://repository.its.ac.id/id/eprint/142805

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