TY - JOUR
T1 - Effects and mechanisms of water matrix on surface-enhanced Raman scattering analysis of arsenite on silver nanofilm
AU - Xu, Zhonghou
AU - Meng, Xiaoguang
AU - Zhang, Yuejin
AU - Li, Fasheng
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2016/5/20
Y1 - 2016/5/20
N2 - Ag nanofilm was synthesized using a modified mirror reaction and used as surface-enhanced Raman scattering (SERS) substrate for analysis of arsenite (As(III)). The SERS substrate can detect 20 and 50 μg L-1 As(III) spiked in aged tap water and groundwater respectively. The effect of nine common ions (Na+, K+, Ca2+, Mg2+, NO3-, CO32-, HPO42-, SO42-and Cl-) in natural water on SERS of 0.5 mg L-1 As(III) was investigated. Na+ and K+ (100 mg L-1) had no obvious negative effects on the SERS intensity of 0.5 mg L-1 As(III), but Ca2+ and Mg2+ significantly decreased that of 0.5 mg L-1 As(III) as their concentrations increased to 1 and 10 mg L-1 respectively. NO3-, SO42-and CO32-(HPO42-) had negligible, medium and significant inhibition on the SERS of As(III) respectively. The inhibition effect of Ca2+ might be through the formation of surface complexes with As(III) on SERS substrate. The inhibition effect of CO32-, HPO42-and SO42- could be explained by the competitive adsorption of anions with As(III) for adsorption sites of Ag nanofilm. It was confirmed that Cl- can activate the SERS of As(III) alone and in the presence of Ca2+, CO32-, HPO42-and SO42-. The activation effect of Cl- on SERS of As(III) could be attributed to charge transfer (CE) mechanism.
AB - Ag nanofilm was synthesized using a modified mirror reaction and used as surface-enhanced Raman scattering (SERS) substrate for analysis of arsenite (As(III)). The SERS substrate can detect 20 and 50 μg L-1 As(III) spiked in aged tap water and groundwater respectively. The effect of nine common ions (Na+, K+, Ca2+, Mg2+, NO3-, CO32-, HPO42-, SO42-and Cl-) in natural water on SERS of 0.5 mg L-1 As(III) was investigated. Na+ and K+ (100 mg L-1) had no obvious negative effects on the SERS intensity of 0.5 mg L-1 As(III), but Ca2+ and Mg2+ significantly decreased that of 0.5 mg L-1 As(III) as their concentrations increased to 1 and 10 mg L-1 respectively. NO3-, SO42-and CO32-(HPO42-) had negligible, medium and significant inhibition on the SERS of As(III) respectively. The inhibition effect of Ca2+ might be through the formation of surface complexes with As(III) on SERS substrate. The inhibition effect of CO32-, HPO42-and SO42- could be explained by the competitive adsorption of anions with As(III) for adsorption sites of Ag nanofilm. It was confirmed that Cl- can activate the SERS of As(III) alone and in the presence of Ca2+, CO32-, HPO42-and SO42-. The activation effect of Cl- on SERS of As(III) could be attributed to charge transfer (CE) mechanism.
KW - Arsenite
KW - Speciation
KW - Surface-enhanced raman scattering
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U2 - 10.1016/j.colsurfa.2016.02.042
DO - 10.1016/j.colsurfa.2016.02.042
M3 - Article
AN - SCOPUS:84959261969
SN - 0927-7757
VL - 497
SP - 117
EP - 125
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
ER -