Silver adsorption on biochar produced from spent coffee grounds: validation by kinetic and isothermal modelling
Islam, Md Anwarul, Parvin, Mst Irin, Dada, Tewodros Kassa, Kumar, Ravinder, and Antunes, Elsa (2023) Silver adsorption on biochar produced from spent coffee grounds: validation by kinetic and isothermal modelling. Biomass Conversion and Biorefinery. (In Press)
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Abstract
This study investigates silver adsorption on biochar produced from pyrolysis of spent coffee grounds (SCGs). Biochars were produced from SCGs at temperatures between 500 and 1000 °C. SCG-derived biochars were then characterised by different analytical methods, such as Brunauer-Emmet-Teller (BET), Fourier transform infrared (FTIR), X-ray diffraction (XRD), and investigated for silver removal. The results revealed that the biochar produced at 500 °C offered a maximum surface area of 40.1 m2/g with a yield of 23.48% biochar and the highest silver adsorption capacity of 49.0 mg/g with 99.9% silver removal efficiency. The morphology of adsorbed silver on biochar was determined using scanning electron microscopy–energy-dispersive spectrometry (SEM–EDS), and XRD analyses, which showed an even distribution of silver on the biochar surface. Furthermore, X-ray photoelectron spectroscopy (XPS) confirmed that part of the silver ions was reduced to form metallic silver (Ag0)/silver nanoparticles (Ag NPs) during adsorption. The kinetics and isothermal evaluation suggested that silver adsorption was dominated by the pseudo-second-order model and Langmuir isotherm, which means that silver adsorption was mainly dominated by chemisorption and monolayer on biochar surface. Overall, this study suggests that 500 °C was the most feasible pyrolysis temperature to produce SCG-derived biochar with suitable physicochemical properties that can efficiently adsorb silver species from wastewater.
| Item ID: | 76974 |
|---|---|
| Item Type: | Article (Research - C1) |
| ISSN: | 2190-6823 |
| Keywords: | Pyrolysis kinetics, Biochar application, Adsorption kinetics, Spent coffee grounds, Silver pollution, Heavy metal removal |
| Copyright Information: | © The Author(s) 2022. 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/licenses/by/4.0/. |
| Date Deposited: | 07 Dec 2022 09:09 |
| FoR Codes: | 40 ENGINEERING > 4004 Chemical engineering > 400410 Wastewater treatment processes @ 100% |
| SEO Codes: | 18 ENVIRONMENTAL MANAGEMENT > 1803 Fresh, ground and surface water systems and management > 180399 Fresh, ground and surface water systems and management not elsewhere classified @ 50% 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering @ 50% |
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