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- W2795484200 abstract "This study demonstrates that silver (Ag+) impregnated graphene oxide (GO) reduces anion and natural organic matter (NOM) competition for bromide (Br−) adsorption sites compared with Ag+ impregnated powdered activated carbon (PAC). We impregnated two GO (Tour and Modifier Hummers [MH] method) and one PAC with silver ions. Batch studies were conducted to assess Br− removal in model waters with Br−, chloride (Cl−), bicarbonate (HCO3−), and/or NOM and natural surface waters. In buffered ultrapure water, Tour-Ag, MH-Ag, and PAC-Ag all removed >85% of Br−, while sorbents without Ag+ removed <3% of Br−. In all water matrices, Tour-Ag removed >75% of Br−, MH-Ag removed >50%, and PAC-Ag removed >30%, highlighting that GO-Ag is more effective at removing Br− from water than PAC-Ag (p < 0.05). Scanning electron microscopy and energy dispersive X-ray spectroscopy analysis show that Br− is evenly dispersed on the surface of GO-Ag, indicating possible attachment to oxygen groups and silver on the GO surface. A leaching test of GO-Ag in buffered water showed that ∼20% of Ag+ loaded onto GO leaches into solution, of which only 1–3% remains when Br− is spiked into solution, indicating possible complexation and precipitation as AgBr. GO-Ag and PAC-Ag were introduced separately in combination with alum during coagulation and flocculation operations. Both MH-Ag and Tour-Ag showed high removal of Br−, demonstrating that GO-Ag could supplement current technologies used in water treatment facilities when Br− removal is needed." @default.
- W2795484200 created "2018-04-13" @default.
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- W2795484200 date "2018-09-01" @default.
- W2795484200 modified "2023-09-25" @default.
- W2795484200 title "Removal of Bromide from Surface Water: Comparison Between Silver-Impregnated Graphene Oxide and Silver-Impregnated Powdered Activated Carbon" @default.
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- W2795484200 doi "https://doi.org/10.1089/ees.2017.0485" @default.
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