纳米棒
选择性
乙二胺
铜
检出限
吸附
材料科学
比色法
核化学
无机化学
锌
化学
纳米技术
色谱法
催化作用
物理化学
有机化学
冶金
作者
Shiyu Hu,Guohao Yan,Liying Zhang,Shasha Yi,Zhongtao Zhang,Yu Wang,Deliang Chen
标识
DOI:10.1021/acsami.2c08946
摘要
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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