A critical review on silver nanoparticles: from synthesis and applications to its mitigation through low-cost adsorption by biochar

Islam, Md Anwarul, Jacob, Mohan V., and Antunes, Elsa (2021) A critical review on silver nanoparticles: from synthesis and applications to its mitigation through low-cost adsorption by biochar. Journal of Environmental Management, 281. 111918.

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Silver nanoparticles are one of the most beneficial forms of heavy metals in nanotechnology applications. Due to its exceptional antimicrobial properties, low electrical and thermal resistance, and surface plasmon resonance, silver nanoparticles are used in a wide variety of products, including consumer goods, healthcare, catalysts, electronics, and analytical equipment. As the production and applications of silver nanoparticles containing products increase daily, the environmental pollution due to silver nanoparticles release is increasing and affecting especially the aqueous ecosystem. Silver nanoparticles can kill useful bacteria in soil and water, and bioaccumulate in living organisms even at low concentrations from 10−² to 10 μg/mL silver can show antibacterial effect. On the other hand, the maximum silver discharge limit into freshwater is 0.1 μg/L and 3.2 μg/L for Australia and the USA, respectively. To reduce its toxic consequences and meet the regulatory guidelines, it is crucial to remove silver nanoparticles from wastewater before it is discharged into other water streams. Several technologies are available to remove silver nanoparticles, but the adsorption process using low-cost adsorbents is a promising alternative to mitigate silver nanoparticle pollution in the bulk stage. As one of the low-cost adsorbents, biochar produced from the biomass waste could be a suitable adsorbent. This review focuses on collating the latest evidence on silver nanoparticle production, applications, environmental consequences, and cost-effective technological approaches for silver removal from wastewater.

Item ID: 65664
Item Type: Article (Research - C1)
ISSN: 0301-4797
Keywords: Adsorption; Biochar; Environmental pollution; Nano silver; Nanoparticles
Copyright Information: © 2020 Elsevier Ltd. All rights reserved.
Date Deposited: 15 Jan 2021 05:18
FoR Codes: 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410404 Environmental management @ 50%
40 ENGINEERING > 4004 Chemical engineering > 400410 Wastewater treatment processes @ 50%
SEO Codes: 96 ENVIRONMENT > 9609 Land and Water Management > 960912 Urban and Industrial Water Management @ 30%
97 EXPANDING KNOWLEDGE > 970109 Expanding Knowledge in Engineering @ 40%
97 EXPANDING KNOWLEDGE > 970105 Expanding Knowledge in the Environmental Sciences @ 30%
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