Biosorptive removal of bare-, citrate-, and PVP-coated silver nanoparticles from aqueous solution by activated sludge

Oh, Seung Yeon; Sung, Hwa Kyung; Park, Chulhwan; Kim, Younghun

doi:10.1016/j.jiec.2014.10.012

Cited by 18 publications

(9 citation statements)

References 18 publications

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“…Four different chemicals were used, and the results included 98% removal with sodium citrate used as reducing and stabilizing agent, 99.9% removal with sodium borohybride as reducing agent, 99.8% with D-glucose and sodium pyrophosphate as stabilizing agent, and 99.9% removal with sodium pyrophosphate as stabilizing and sodium borohybride as reducing agent [25]. Activated sludge biological flocs were also used successfully to remove silver nanoparticles [26].…”

Section: Comparison Of Synthetic and Natural Coagulant For Silver Nanmentioning

confidence: 99%

A comparative study of synthetic and natural coagulants for silver nanoparticles removal from wastewater

Ahmed

Bhatti

Maqbool

et al. 2016

Desalination and Water Treatment

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A B S T R A C TUse of silver nanoparticles is increasing in different packaging material as disinfectant to protect food and pharmaceutical products. Its use has raised the contamination risk of fresh water and human exposure can cause serious problems. The coagulation/flocculation process can be an attractive option for silver nanoparticles removal at small-scale treatment just after its use. Four coagulants, aluminum sulfate, ferric chloride, Ocimum basilicum, and Hibiscus esculentus (synthetic and natural) were applied. For coagulation/flocculation activity, a series of jar test experiments were conducted to treat silver nanoparticles at concentration of 1 mg L −1 from wastewater. H. esculentus efficiently removed silver nanoparticles (98.7%) from aqueous solution at a dose of 150 mg L −1 , whereas at same coagulant dose, ferric chloride, O. basilicum, and aluminum sulfate successfully removed silver nanoparticles at 96, 69, and 50%, respectively. No broad change in pH was observed and it remained between 6.5 and 7.5 during all the experiments at room temperature.

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Section: Comparison Of Synthetic and Natural Coagulant For Silver Nanmentioning

confidence: 99%

A comparative study of synthetic and natural coagulants for silver nanoparticles removal from wastewater

Ahmed

Bhatti

Maqbool

et al. 2016

Desalination and Water Treatment

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“…It has been shown that most of the silver in the WWTPs will be captured and settled in the sludge (Hendren et al, 2013; Barton et al, 2015; Oh et al, 2015). Field analyses of WWTPs estimated that up to 95% of the silver was eliminated from the wastewater by binding to sludge; and silver concentrations in sludge between 1 and 6 mg/kg can be expected (Gottschalk et al, 2009; Li et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

AgNPs Change Microbial Community Structures of Wastewater

et al. 2019

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Due to their strong antimicrobial activity, silver nanoparticles (AgNPs) are massively produced, applied, consumed and, as a negative consequence, released into wastewater treatment plants. Most AgNPs are assumed to be bound by sludge, and thus bear potential risk for microbial performance and stability. In this lab-scale study, flow cytometry as a high-throughput method and 16S rRNA gene amplicon Illumina MiSeq sequencing were used to track microbial community structure changes when being exposed to AgNPs. Both methods allowed deeper investigation of the toxic impact of chemicals on microbial communities than classical EC50 determination. In addition, ecological metrics were used to quantify microbial community variations depending on AgNP types (10 and 30 nm) and concentrations. Only low changes in α- and intra-community β-diversity values were found both in successive negative and positive control batches and batches that were run with AgNPs below the EC50 value. Instead, AgNPs at EC50 concentrations caused upcoming of certain and disappearance of formerly dominant subcommunities. Flavobacteriia were among those that almost disappeared, while phylotypes affiliated with Gammaproteobacteria (3.6-fold) and Bacilli (8.4-fold) increased in cell abundance in comparison to the negative control. Thus, silver amounts at the EC50 value affected community structure suggesting a potential negative impact on functions in wastewater treatment systems.

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“…The diameter of particles contributes to the aggregation and occulation of Ag-NPs (Oh et al 2015, Zhang et al 2020. The increase in size suggests that bioremoval took place and is relevant to the adsorptive capacity of the used adsorbent in the present study.…”

Section: Discussionmentioning

confidence: 77%

“…The present study also shows that PVP-Ag-NPs size has increased after removal by A. niger, EPS induced A. niger, media, and in vitro EPS. The diameter of particles contributes to the aggregation and occulation of Ag-NPs (Oh et al 2015, Zhang et al 2020. The increase in size suggests that bioremoval took place and is relevant to the adsorptive capacity of the used adsorbent in the present study.…”

Section: Discussionmentioning

confidence: 99%

“…ENPs in general have been reported to be successfully removed via coagulation, occulation, ltration (Lawler et al 2013), and aggregation (Zhang et al 2020). However, bioremoval using microorganisms and their metabolites is still considered cost-effective, e cient, and environmentally friendly as compared to other chemical and physical treatments (Khan et al 2012, Oh et al 2015. The interaction between microbes and metals, in general, can take place via metabolism-dependent or independent pathways, rendering the metals less toxic or less available to prevent their leaching in the environment magnifying the problem (Gupta and Diwan 2017).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bioremoval of PVP coated silver nanoparticles using Aspergillus niger: the role of exopolysaccharides

Gomaa¹,

Alrshim

Chanda

2021

Preprint

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The present work aims to study the removal of Polyvinylpyrrolidone coated silver nanoparticles (PVP-Ag-NPs) using Aspergillus niger and depict the role of exopolysaccharides in the removal process. Our results show that the majority of PVP-Ag-NPs were attached to fungal pellets. About 74% and 88% PVP-Ag-NPs were removed when incubated with A. niger pellets and exopolysaccharide-induced A. niger pellets, respectively. Ionized Ag decreased by 553 and 1290 fold under the same conditions as compared to stock PVP-Ag-NP. PVP-Ag-PVP resulted in an increase in reactive oxygen species (ROS) in 24h. The UV-Visible spectrum shows the disappearance of Ag characteristic peak and the broadness of the spectrum suggested an increase in size. Dynamic Light Scattering results showed an increase in PVP-Ag-NPs size from 28.4 nm to 115.9 nm for A. niger pellets and 160.3 nm after removal by stress-induced A. niger pellets and further increased to 650.1 nm for in vitro EPS removal. Our findings show that EPS can be used for nanoparticle removal, by increasing the net size of nanoparticles in aqueous media, this will, in turn, facilitate its filtration through conventional filtration techniques commonly used at wastewater treatment plants.

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Biosorptive removal of bare-, citrate-, and PVP-coated silver nanoparticles from aqueous solution by activated sludge

Cited by 18 publications

References 18 publications

A comparative study of synthetic and natural coagulants for silver nanoparticles removal from wastewater

A comparative study of synthetic and natural coagulants for silver nanoparticles removal from wastewater

AgNPs Change Microbial Community Structures of Wastewater

Bioremoval of PVP coated silver nanoparticles using Aspergillus niger: the role of exopolysaccharides

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