Surijanto, M. Prouda Fritzalfa Aqilla Rizki (2026) Sensor Elektrokimia Berbasis Screen-Printed Carbon Electrode (SPCE) Termodifikasi Zn-Doped CeO₂/rGO (Reduced Graphene Oxide) untuk Deteksi Logam Berat (Pb dan Cd) pada Air Limbah. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Kontaminasi logam berat pada air limbah, khususnya timbal (Pb2+) dan Kadmium (Cd2+) menjadi permasalahan lingkungan yang serius karena dapat membahayakan ekosistem dan kesehatan manusia. Penelitian ini mengembangkan sensor elektrokimia berbasis screen-printed carbon electrode (SPCE) termodifikasi Zn-doped CeO2/rGO untuk mendeteksi ion logam Pb2+ dan Cd2+ dalam air. Zn-doped CeO2/rGO disintesis menggunakan metode hidrotermal dengan variasi dopan Zn sebesar 5, 10, 15, dan 20 mol%, sedangkan SPCE difabrikasi sebagai platform elektroda yang sederhana, ekonomis, dan portabel. Karakterisasi material dan elektroda dilakukan dengan menggunakan XRD, FTIR, Spektroskopi UV-Vis, SEM-EDX, Contact Angle, Four-point probe, Cyclic Voltammetry, Electrochemical Impedance Spectroscopy, dan Differential Pulse Voltammetry. Hasil karakterisasi menunjukkan keberhasilan terbentuknya Zn-doped CeO2/rGO. Hasil pengujian DPV menunjukkan bahwa variasi Zn10-doped CeO₂/rGO memberikan performa terbaik untuk deteksi Pb²⁺ dengan sensitivitas 0,07257 µA/(mg/L), linieritas 0,98299, LOD 0,3524 mg/L, dan LOQ 1,0681 mg/L. Sementara itu, variasi Zn5-doped CeO₂/rGO menunjukkan performa terbaik untuk deteksi Cd²⁺ dengan sensitivitas 0,17418 µA/(mg/L), linieritas 0,99711, LOD 0,1231 mg/L, dan LOQ 0,3730 mg/L. Dibandingkan dengan spektroskopi UV-Vis, sensor berbasis DPV menunjukkan sensitivitas dan linearitas yang lebih rendah serta nilai LOD dan LOQ yang lebih tinggi. Meskipun demikian, DPV memiliki selektivitas yang baik karena mampu membedakan respons elektrokimia Pb²⁺ dan Cd²⁺ berdasarkan perbedaan potensial puncaknya. Dengan demikian, SPCE termodifikasi Zn-doped CeO₂/rGO berpotensi digunakan sebagai platform deteksi awal logam berat yang cepat, sederhana, ekonomis, dan ramah lingkungan. Namun, optimasi lebih lanjut masih diperlukan agar batas deteksinya memenuhi standar pemantauan air limbah.
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Heavy metal contamination in wastewater, particularly lead (Pb²⁺) and cadmium (Cd²⁺), is a serious environmental issue because it can endanger ecosystems and human health. This study developed an electrochemical sensor based on a screen-printed carbon electrode (SPCE) modified with Zn-doped CeO₂/rGO for the detection of Pb²⁺ and Cd²⁺ ions in water. Zn-doped CeO₂/rGO was synthesized using a hydrothermal method with Zn dopant concentrations of 5, 10, 15, and 20 mol%, while the SPCE was fabricated as a simple, cost-effective, and portable electrode platform. Material and electrode characterization was carried out using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), UV-Vis spectroscopy, scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDX), contact-angle measurements, four-point probe analysis, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). The characterization results confirmed the successful formation of Zn-doped CeO₂/rGO. DPV measurements showed that Zn10-doped CeO₂/rGO provided the best performance for Pb²⁺ detection, with a sensitivity of 0.07257 µA/(mg/L), a linearity of 0.98299, a limit of detection (LOD) of 0.3524 mg/L, and a limit of quantification (LOQ) of 1.0681 mg/L. Meanwhile, Zn5-doped CeO₂/rGO exhibited the best performance for Cd²⁺ detection, with a sensitivity of 0.17418 µA/(mg/L), a linearity of 0.99711, an LOD of 0.1231 mg/L, and an LOQ of 0.3730 mg/L. Compared with UV-Vis spectroscopy, the DPV-based sensor showed lower sensitivity and linearity as well as higher LOD and LOQ values. Nevertheless, DPV demonstrated good selectivity because it was able to distinguish the electrochemical responses of Pb²⁺ and Cd²⁺ based on their different peak potentials. Therefore, the Zn-doped CeO₂/rGO-modified SPCE has potential as a rapid, simple, cost-effective, and environmentally friendly platform for the preliminary detection of heavy metals. However, further optimization is required to achieve detection limits that comply with wastewater monitoring standards.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Air Limbah, Logam Berat, Sensor Elektrokimia, Screen-Printed Carbon Electrode, Zn-doped CeO2/rGO, Wastewater, Heavy Metals, Electrochemical Sensor |
| Subjects: | Q Science > QD Chemistry > QD115 Electrochemical analysis T Technology > TD Environmental technology. Sanitary engineering > TD899 Waste control in special industries, plants, processes, etc |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis |
| Depositing User: | M. Prouda Fritzalfa Aqilla Rizki Surijanto |
| Date Deposited: | 03 Aug 2026 02:17 |
| Last Modified: | 03 Aug 2026 02:17 |
| URI: | http://repository.its.ac.id/id/eprint/140624 |
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