Gold-silver nanoparticles modified electrochemical sensor array for simultaneous determination of chromium(III) and chromium(VI) in wastewater samples
The oxidation state of ions is a crucial aspect that often has been overlooked when determining the toxicity of chromium (Cr) species in environmental samples. In this study, a novel electrochemical sensor array based on gold-silver nanoparticles modified electrodes was developed for simultaneous de...
| Main Authors: | , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Online Access: | https://hdl.handle.net/10356/159653 |
| _version_ | 1826129690972127232 |
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| author | Zhao, Ke Ge, Liya Wong, Ten It Zhou, Xiaodong Lisak, Grzegorz |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Zhao, Ke Ge, Liya Wong, Ten It Zhou, Xiaodong Lisak, Grzegorz |
| author_sort | Zhao, Ke |
| collection | NTU |
| description | The oxidation state of ions is a crucial aspect that often has been overlooked when determining the toxicity of chromium (Cr) species in environmental samples. In this study, a novel electrochemical sensor array based on gold-silver nanoparticles modified electrodes was developed for simultaneous determination of the two main chromium species (Cr(III) and (VI)). Specifically, the working electrodes of screen-printed carbon electrodes (SPCEs) were modified with silver-gold bimetallic nanoparticles through electrochemical deposition for detection of Cr(VI). The silver-gold bimetallic nanoparticles were further oxidized to form stable silver-gold bimetallic oxide nanoparticles for the detection of Cr(III). The results showed that the addition of silver with a theoretical value of 1% of gold could contribute to the formation and stabilization of oxides on the surface of gold nanoparticles. After characterization, the two kinds of electrodes were integrated as an electrochemical sensor array for selective and sensitive detection of Cr(VI) and Cr(III). The linear range and limit of detection (LOD, identified by three times of signal-to-noise ratio) were found to be 0.05-5 ppm and 0.1 ppb for Cr(VI), and 0.05-1 ppm and 0.1 ppb for Cr(III), respectively. Finally, the electrochemical sensor array was proven for successful detection of Cr(VI) and Cr(III) in tap water, artificial saliva and artificial sweat samples, and monitoring of Cr(VI) and Cr(III) in chromium-containing wastewater treatment process. Combined with a handheld dual-channel electrochemical device, the simultaneous determination of Cr(VI), Cr(III) and total chromium contents can be easily achieved for various samples. |
| first_indexed | 2024-10-01T07:44:20Z |
| format | Journal Article |
| id | ntu-10356/159653 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:44:20Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1596532022-06-28T07:29:08Z Gold-silver nanoparticles modified electrochemical sensor array for simultaneous determination of chromium(III) and chromium(VI) in wastewater samples Zhao, Ke Ge, Liya Wong, Ten It Zhou, Xiaodong Lisak, Grzegorz School of Civil and Environmental Engineering Nanyang Environment and Water Research Institute Engineering::Environmental engineering Chromium Speciation The oxidation state of ions is a crucial aspect that often has been overlooked when determining the toxicity of chromium (Cr) species in environmental samples. In this study, a novel electrochemical sensor array based on gold-silver nanoparticles modified electrodes was developed for simultaneous determination of the two main chromium species (Cr(III) and (VI)). Specifically, the working electrodes of screen-printed carbon electrodes (SPCEs) were modified with silver-gold bimetallic nanoparticles through electrochemical deposition for detection of Cr(VI). The silver-gold bimetallic nanoparticles were further oxidized to form stable silver-gold bimetallic oxide nanoparticles for the detection of Cr(III). The results showed that the addition of silver with a theoretical value of 1% of gold could contribute to the formation and stabilization of oxides on the surface of gold nanoparticles. After characterization, the two kinds of electrodes were integrated as an electrochemical sensor array for selective and sensitive detection of Cr(VI) and Cr(III). The linear range and limit of detection (LOD, identified by three times of signal-to-noise ratio) were found to be 0.05-5 ppm and 0.1 ppb for Cr(VI), and 0.05-1 ppm and 0.1 ppb for Cr(III), respectively. Finally, the electrochemical sensor array was proven for successful detection of Cr(VI) and Cr(III) in tap water, artificial saliva and artificial sweat samples, and monitoring of Cr(VI) and Cr(III) in chromium-containing wastewater treatment process. Combined with a handheld dual-channel electrochemical device, the simultaneous determination of Cr(VI), Cr(III) and total chromium contents can be easily achieved for various samples. National Environmental Agency (NEA) This work was supported by the National Environment Agency (NEA) of Singapore under the Urban Solutions and Sustainability (USS) Integration Fund [Project Reference No. NEA/ETD/R&DPROJ/CTWL2018-4D-03]. 2022-06-28T07:29:08Z 2022-06-28T07:29:08Z 2021 Journal Article Zhao, K., Ge, L., Wong, T. I., Zhou, X. & Lisak, G. (2021). Gold-silver nanoparticles modified electrochemical sensor array for simultaneous determination of chromium(III) and chromium(VI) in wastewater samples. Chemosphere, 281, 130880-. https://dx.doi.org/10.1016/j.chemosphere.2021.130880 0045-6535 https://hdl.handle.net/10356/159653 10.1016/j.chemosphere.2021.130880 34029966 2-s2.0-85106891289 281 130880 en NEA/ETD/R&DPROJ/CTWL2018-4D-03 Chemosphere © 2021 Published by Elsevier Ltd. |
| spellingShingle | Engineering::Environmental engineering Chromium Speciation Zhao, Ke Ge, Liya Wong, Ten It Zhou, Xiaodong Lisak, Grzegorz Gold-silver nanoparticles modified electrochemical sensor array for simultaneous determination of chromium(III) and chromium(VI) in wastewater samples |
| title | Gold-silver nanoparticles modified electrochemical sensor array for simultaneous determination of chromium(III) and chromium(VI) in wastewater samples |
| title_full | Gold-silver nanoparticles modified electrochemical sensor array for simultaneous determination of chromium(III) and chromium(VI) in wastewater samples |
| title_fullStr | Gold-silver nanoparticles modified electrochemical sensor array for simultaneous determination of chromium(III) and chromium(VI) in wastewater samples |
| title_full_unstemmed | Gold-silver nanoparticles modified electrochemical sensor array for simultaneous determination of chromium(III) and chromium(VI) in wastewater samples |
| title_short | Gold-silver nanoparticles modified electrochemical sensor array for simultaneous determination of chromium(III) and chromium(VI) in wastewater samples |
| title_sort | gold silver nanoparticles modified electrochemical sensor array for simultaneous determination of chromium iii and chromium vi in wastewater samples |
| topic | Engineering::Environmental engineering Chromium Speciation |
| url | https://hdl.handle.net/10356/159653 |
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