In this study, chlorophyll-copper (ChlCu)-modified ZnO
nanorods (ChlCu/ZnO) were prepared, and then sodium ethylenediamine
tetraacetate
(EDTA) was used to remove part of Cu2+ in ChlCu, leaving
cavities with specific adsorption activity for Cu2+ in
E-ChlCu/ZnO. Appropriate EDTA treatment improved the photoactivity
of ChlCu/ZnO and the adsorption selectivity to Cu2+. However,
excessive EDTA treatment might lead to the collapse of the ChlCu structure,
resulting in a decrease in photoactivity. The E-ChlCu/ZnO sample with
8 h of ChlCu treatment and 2 h of EDTA treatment showed optimal photoactivity.
The as-prepared E-ChlCu/ZnO exhibited activity as a light-activated
nanozyme, which could oxidize 3,3′,5,5′-tetramethylbenzidine
(TMB) to blue under illumination, but when Cu2+ was present
in the solution, this colorimetric reaction was inhibited; therefore,
E-ChlCu/ZnO could be used for colorimetric detection of Cu2+. Because of the existence of specific cavities, E-ChlCu/ZnO showed
excellent detection selectivity, a wide linear detection range (0–1
and 1–15 μM), and a low detection limit (0.024 μM)
in the colorimetric
detection of Cu2+.
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