Aluminium-based metal-organic framework-fabricated electrochemical sensor for ultrasensitive hydroquinone hazard detection in water samples
A sensitive electrochemical sensor based on aluminium-based metal-organic framework (CAU-1) deposited glassy carbon electrode (GCE) was utilized to detect hydroquinone (HQ), an environmental pollutant in the water sample. The synthesized CAU-1 was characterized by Fourier transform infrared (FT-IR)...
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| Format: | Thesis |
| Language: | English |
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2020
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| Online Access: | http://psasir.upm.edu.my/id/eprint/98090/ http://psasir.upm.edu.my/id/eprint/98090/1/ITMA%202021%2010%20IR.pdf |
| _version_ | 1848862774785998848 |
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| author | Sim, Siew Ming |
| author_facet | Sim, Siew Ming |
| author_sort | Sim, Siew Ming |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | A sensitive electrochemical sensor based on aluminium-based metal-organic framework (CAU-1) deposited glassy carbon electrode (GCE) was utilized to detect hydroquinone (HQ), an environmental pollutant in the water sample. The synthesized CAU-1 was characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS). The FT-IR results revealed the C=O vibrations presented in the as-synthesized CAU-1 sample which proved the incorporation of the amino-terephthalic acid in CAU-1. Besides, since the XRD pattern obtained for the as-synthesized CAU-1 sample was in good agreement with the simulated CAU-1 (CCDC: 723320), this strongly proved the successful synthesized of the CAU-1. Furthermore, CAU-1 showed rod-shaped morphology with an average length of 280 ± 33 nm through SEM analysis. Besides, CAU-1 had a Langmuir surface area of 1349 m2g-1 and a micropore volume of 0.41 cm3 g-1. The CAU-1 was successfully fabricated on GCE using nafion as a immobilization matrix. The electrochemical behavior of the CAU-1/GCE was studied by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis. The EIS result proved that the modified CAU-1/GCE had lower resistance, which is 683 Ω compared to bare GCE. This indicated that CAU-1 with high porosity and high surface area had contributed to the fast electron transfer between electrode-electrolyte interface. The electrochemical behavior of HQ was investigated at CAU-1/GCE surface and studied the kinetics of HQ oxidation. The CAU-1 fabricated electrode highly catalyzed the oxidation of HQ than the bare GCE. The CAU-1/GCE was proven to have excellent repeatability with relative standard deviation (RSD) of 0.69% for the same sensor that runs 20 cycles consecutively and RSD of 3.96% for four sensors reproduced by using the same procedure. Besides, this sensor also shows good selectivity and anti-interference properties in HQ detection with the detection limit of 0.015 μM with an excellent sensitivity of 1555.7 μA/mM/cm2. Furthermore, the recovery of HQ was 99.34 % to 103.93 % which proved the practical applicability and reliability of the modified CAU-1/GCE in the real-life application. |
| first_indexed | 2025-11-15T13:22:22Z |
| format | Thesis |
| id | upm-98090 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T13:22:22Z |
| publishDate | 2020 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-980902022-07-19T01:02:18Z http://psasir.upm.edu.my/id/eprint/98090/ Aluminium-based metal-organic framework-fabricated electrochemical sensor for ultrasensitive hydroquinone hazard detection in water samples Sim, Siew Ming A sensitive electrochemical sensor based on aluminium-based metal-organic framework (CAU-1) deposited glassy carbon electrode (GCE) was utilized to detect hydroquinone (HQ), an environmental pollutant in the water sample. The synthesized CAU-1 was characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS). The FT-IR results revealed the C=O vibrations presented in the as-synthesized CAU-1 sample which proved the incorporation of the amino-terephthalic acid in CAU-1. Besides, since the XRD pattern obtained for the as-synthesized CAU-1 sample was in good agreement with the simulated CAU-1 (CCDC: 723320), this strongly proved the successful synthesized of the CAU-1. Furthermore, CAU-1 showed rod-shaped morphology with an average length of 280 ± 33 nm through SEM analysis. Besides, CAU-1 had a Langmuir surface area of 1349 m2g-1 and a micropore volume of 0.41 cm3 g-1. The CAU-1 was successfully fabricated on GCE using nafion as a immobilization matrix. The electrochemical behavior of the CAU-1/GCE was studied by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analysis. The EIS result proved that the modified CAU-1/GCE had lower resistance, which is 683 Ω compared to bare GCE. This indicated that CAU-1 with high porosity and high surface area had contributed to the fast electron transfer between electrode-electrolyte interface. The electrochemical behavior of HQ was investigated at CAU-1/GCE surface and studied the kinetics of HQ oxidation. The CAU-1 fabricated electrode highly catalyzed the oxidation of HQ than the bare GCE. The CAU-1/GCE was proven to have excellent repeatability with relative standard deviation (RSD) of 0.69% for the same sensor that runs 20 cycles consecutively and RSD of 3.96% for four sensors reproduced by using the same procedure. Besides, this sensor also shows good selectivity and anti-interference properties in HQ detection with the detection limit of 0.015 μM with an excellent sensitivity of 1555.7 μA/mM/cm2. Furthermore, the recovery of HQ was 99.34 % to 103.93 % which proved the practical applicability and reliability of the modified CAU-1/GCE in the real-life application. 2020-10 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/98090/1/ITMA%202021%2010%20IR.pdf Sim, Siew Ming (2020) Aluminium-based metal-organic framework-fabricated electrochemical sensor for ultrasensitive hydroquinone hazard detection in water samples. Masters thesis, Universiti Putra Malaysia. Electrochemical sensors Hydroquinone Metallic composites |
| spellingShingle | Electrochemical sensors Hydroquinone Metallic composites Sim, Siew Ming Aluminium-based metal-organic framework-fabricated electrochemical sensor for ultrasensitive hydroquinone hazard detection in water samples |
| title | Aluminium-based metal-organic framework-fabricated electrochemical sensor for ultrasensitive hydroquinone hazard detection in water samples |
| title_full | Aluminium-based metal-organic framework-fabricated electrochemical sensor for ultrasensitive hydroquinone hazard detection in water samples |
| title_fullStr | Aluminium-based metal-organic framework-fabricated electrochemical sensor for ultrasensitive hydroquinone hazard detection in water samples |
| title_full_unstemmed | Aluminium-based metal-organic framework-fabricated electrochemical sensor for ultrasensitive hydroquinone hazard detection in water samples |
| title_short | Aluminium-based metal-organic framework-fabricated electrochemical sensor for ultrasensitive hydroquinone hazard detection in water samples |
| title_sort | aluminium-based metal-organic framework-fabricated electrochemical sensor for ultrasensitive hydroquinone hazard detection in water samples |
| topic | Electrochemical sensors Hydroquinone Metallic composites |
| url | http://psasir.upm.edu.my/id/eprint/98090/ http://psasir.upm.edu.my/id/eprint/98090/1/ITMA%202021%2010%20IR.pdf |