Green and ligand-free gold nanoparticles in Padina australis extract for colorimetric detection of Cu2+in water

被引：9
|
作者：
Wu, Lihua [1 ]
Huang, Gangan [1 ]
Xie, Ting [1 ]
Zhang, Anran [1 ]
Fu, Yunzhi [1 ]
机构：
[1] Hainan Univ, Sch Sci, Haikou 570228, Peoples R China
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2023年 / 658卷
关键词：
Padina australis extract; AuNPs; Cu2+; Colorimetric detection; SENSOR; BIOSYNTHESIS; PROBE; IONS; ALGA; XPS;
D O I：
10.1016/j.colsurfa.2022.130773
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The green and ligand-free gold nanoparticles (P-AuNPs) from Padina australis extract were easily and quickly prepared. A colorimetric probe based on P-AuNPs was designed for easy and visual detection of Cu2+ in domestic water with excellent sensitivity. The -OH and -NH2 in polysaccharides and proteins of Padina australis had played a reduced and protected role for AuNPs and also been easy to complex Cu2+ because of chelation. The complexed Cu2+ dragged P-AuNPs closely to aggregation, causing the red sol to turn blue. Also, the UV-vis spectrum was red-shifted, and a new peak developed. The limits of UV-vis detection are as low as 0.43 & mu;M. The absorbance ratio (A630/A520) showed an excellent linear relationship with Cu2+ concentration (R2 = 0.9926) with a range of 20-60 & mu;M by UV-vis.
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页数：8
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