Nitrite sensor using activated biochar synthesised by microwave-assisted pyrolysis
Allende, Scarlett, Liu, Yang, Zafar, Muhammad Zafar, and Jacob, Mohan V. (2023) Nitrite sensor using activated biochar synthesised by microwave-assisted pyrolysis. Waste Disposal and Sustainable Energy, 5.
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Abstract
Developing applications for the by-products obtained from waste processing is vital for resource recovery. The synthesis of ZnCl2-activated biochar with high electrocatalytic activity was carried out by the microwave-assisted pyrolysis of pineapple peel and subsequent chemical activation process. Activated biochar is employed in the electrochemical sensing of nitrite by drop casting in a glassy carbon electrode (GCE). The activated biochar exhibited a stacked carbon sheet, 254 m2 g−1 Brunauer, Emmett and Teller (BET) surface area, 0.076 cm3 g−1 pore volume, 189.53 m2 g−1 micropore area and oxygen-containing functional groups. The electrochemical impedance spectroscopy of the modified GCE showed a reduced charge transfer resistance of 61%. This is crucial to determine the electrochemical properties of biochar. The sensor showed a significant current response and an excellent limit of detection of 0.97 µmol L−1. The modified-activated biochar electrochemical sensor demonstrated high selectivity, reproducibility (RSD=2.4%), and stability (RSD=2.6%). Graphical abstract: [Figure not available: see fulltext.]
| Item ID: | 78563 |
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| Item Type: | Article (Research - C1) |
| ISSN: | 2524-7891 |
| Keywords: | Biochar, Electrochemical sensor, Microwave-assisted pyrolysis, Nitrite |
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| Copyright Information: | This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licensesby/4.0/. |
| Date Deposited: | 25 Oct 2023 01:13 |
| FoR Codes: | 40 ENGINEERING > 4016 Materials engineering > 401699 Materials engineering not elsewhere classified @ 100% |
| SEO Codes: | 17 ENERGY > 1707 Processing of energy sources > 170701 Biomass processing @ 100% |
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