Silver removal from aqueous solution by biochar produced from biosolids via microwave pyrolysis

Antunes, Elsa, Jacob, Mohan V., Brodie, Graham, and Schneider, Philip A. (2017) Silver removal from aqueous solution by biochar produced from biosolids via microwave pyrolysis. Journal of Environmental Management, 203 (Part 1). pp. 264-272.

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The contamination of water with silver has increased due to the widespread applications of products with silver employed as antimicrobial agent. Adsorption is a cost-effective method for silver removal from aqueous solution. In this study biochar, produced from the microwave assisted pyrolysis of biosolids, was used for silver removal from an aqueous solution. The adsorption kinetics, isotherms and thermodynamics were investigated to better understand the silver removal process by biochar. X-ray diffraction results demonstrated that silver removal was a combination two consecutive mechanisms, reduction and physical adsorption. The Langmuir model fitted the experimental data well, showing that silver removal was predominantly a surface mechanism. The thermodynamic investigation demonstrated that silver removal by biochar was an exothermic process. The final nanocomposite Ag-biochar (biochar plus silver) was used for methylene blue adsorption and photodegradation. This study showed the potential of using biochar produced from biosolids for silver removal as a promising solution to mitigate water pollution and an environmentally sustainable approach for biosolids management and re-use.

Item ID: 49968
Item Type: Article (Research - C1)
ISSN: 1095-8630
Keywords: adsorption kinetics, Ag-biochar composite, biochar particle diffusion, silver removal
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A version of this publication was included as Chapter 6 of the following PhD thesis: Dos Santos Antunes, Elsa Marisa (2017) Investigations on biochar production from biosolids via microwave assisted pyrolysis and its potential applications. PhD thesis, James Cook University, which is available Open Access in ResearchOnline@JCU. Please see the Related URLs for access.

Funders: Victorian Smart Water Fund (VSWF), Australian Postgraduate Award
Projects and Grants: VSWF project 10OS-018
Date Deposited: 28 Aug 2017 01:53
FoR Codes: 40 ENGINEERING > 4004 Chemical engineering > 400407 Process control and simulation @ 30%
40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials @ 70%
SEO Codes: 96 ENVIRONMENT > 9609 Land and Water Management > 960999 Land and Water Management of Environments not elsewhere classified @ 100%
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