Multilevel modeling of retention and disinfection efficacy of silver nanoparticles on ceramic water filters

This research examined how variations in synthesis methods of silver nanoparticles affect both the release of silver from ceramic water filters (CWFs) and disinfection efficacy. The silver nanoparticles used were stabilized by four different molecules: citrate, polyvinylpyrrolidone, branched polyeth...

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Vydáno v:	The Science of the total environment Ročník 566-567; s. 368 - 377
Hlavní autoři:	Mikelonis, Anne M., Lawler, Desmond F., Passalacqua, Paola
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Netherlands Elsevier B.V 01.10.2016
Témata:	casein Caseins - chemistry Ceramic water filters ceramics Ceramics - chemistry citrates Citric Acid - chemistry coliform bacteria Disinfectants - chemistry Disinfection Disinfection - methods Environmental engineering Excipients - chemistry filtrates Filtration Filtration - methods Ghana Metal Nanoparticles - chemistry Models, Theoretical Multilevel model nanosilver Polyethyleneimine - chemistry polyvinylpyrrolidone Povidone - chemistry rain silver Silver - chemistry Silver nanoparticles statistical models surface water water filters Water Purification - methods Ghana NaBH4 Filtration PPCC Ag Disinfection PVP Ceramic water filters BPEI AgNO3 Multilevel model Environmental engineering CWF DALYs LRV(s) TEM PHW Silver nanoparticles WHO
ISSN:	0048-9697, 1879-1026, 1879-1026
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Popis
Shrnutí:	This research examined how variations in synthesis methods of silver nanoparticles affect both the release of silver from ceramic water filters (CWFs) and disinfection efficacy. The silver nanoparticles used were stabilized by four different molecules: citrate, polyvinylpyrrolidone, branched polyethylenimine, and casein. A multilevel statistical model was built to quantify if there was a significant difference in: a) extent of silver lost, b) initial amount of silver lost, c) silver lost for water of different quality, and d) total coliform removal. Experiments were performed on location at Pure Home Water, a CWF factory in Tamale, Ghana using stored rainwater and dugout water (a local surface water). The results indicated that using dugout vs. rainwater significantly affects the initial (p-value 0.0015) and sustained (p-value 0.0124) loss of silver, but that silver type does not have a significant effect. On average, dugout water removed 37.5μg/L more initial silver and had 1.1μg/L more silver in the filtrate than rainwater. Initially, filters achieved 1.9 log reduction values (LRVs) on average, but among different silver and water types this varied by as much as 2.5 LRV units. Overall, bacterial removal effectiveness was more challenging to evaluate, but some data suggest that the branched polyethylenimine silver nanoparticles provided improved initial bacterial removal over filters which were not painted with silver nanoparticles (p-value 0.038). [Display omitted] •Multilevel modeling is useful for analysis of environmental data.•Ag NP stabilizer does not significantly affect total Ag release from CWFs.•Water type significantly affects the release of total Ag from CWFs.•BPEI silver nanoparticles may provide improved coliform removal.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0048-9697 1879-1026 1879-1026
DOI:	10.1016/j.scitotenv.2016.05.076