We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Determination of Pb 2+ by Colorimetric Method Based on Catalytic Amplification of Ag Nanoparticles Supported by Covalent Organic Frameworks.
- Authors
Yao, Dongmei; Bi, Huiling; Gong, Huimin; Lai, Hongfang; Lu, Sufen
- Abstract
In this paper, covalent organic frameworks (COFs) are prepared by solvothermal synthesis using 1,3,5-benzenetricarboxaldehyde and benzidine as ligands. Then, using COFs as a template, AgCOFs with high catalytic activity is prepared by in situ loading silver nanoparticles (AgNC) on the surface of COFs by sodium borohydride reduction method. AgCOFs are characterized by TEM, SEM, FTIR and XRD. At the same time, the catalytic ability of AgCOFs for trisodium citrate-AgNO3 nanosilver reaction is studied. The results show that AgCOFs can catalyze the reaction of trisodium citrate-AgNO3 to generate silver nanoparticles (AgNPs). The solution color of the system gradually changes from colorless to yellow, and the absorbance value increases. Based on the catalytic reaction of AgCOFs and the regulation effect of nucleic acid aptamer reaction on AgCOFs, a new "on–off–on" colorimetric analysis platform is constructed and applied to the detection of trace Pb2+ in water samples. This analytical platform is simple, sensitive and selective. Finally, the catalytic mechanism of the system is discussed to verify the feasibility of constructing a colorimetric analysis platform.
- Subjects
COLORIMETRY; COLORIMETRIC analysis; SILVER nanoparticles; NANOPARTICLES; SODIUM borohydride; GOLD nanoparticles; NUCLEIC acids
- Publication
Nanomaterials (2079-4991), 2022, Vol 12, Issue 16, p2866
- ISSN
2079-4991
- Publication type
Article
- DOI
10.3390/nano12162866