Department of Applied Chemistry, College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, 361005, China.
Mikrochim Acta. 2019 Apr 15;186(5):288. doi: 10.1007/s00604-019-3404-y.
Carbon dots doped with nitrogen and copper have been synthesized via a hydrothermal method. They possess favorable peroxidase-like catalytic activity over a wide range of pH values and temperatures. Specifically, they were used to catalyze the oxidation of ortho- and para-phenylenediamine (OPD and PPD) by HO. The resulting products possess different colors (yellow for OPD and brown for PPD), which can be visually discriminated. The corresponding typical absorption peaks of oxidized products for OPD and PPD are at 413 nm and 500 nm, respectively. The method displays excellent discrimination ability and selectivity over potential interferents. The detection limits are 1.1 μM for OPD and 1.9 μM for PPD. The respective linear ranges are from 5 to 200 μM for OPD and from 2.5 to 700 μM for PPD. The method was applied to the quantification of OPD and PPD in spiked natural waters. Graphical abstract Schematic presentation of the synthesis of nitrogen and copper co-doped carbon dots (N,Cu-CDs) and their application as an enzyme mimic for colorimetric discrimination of ortho-, meta- and para-phenylenediamine (OPD, MPD and PPD).
氮铜共掺杂碳点通过水热法合成。它们在较宽的 pH 值和温度范围内具有良好的过氧化物酶样催化活性。具体来说，它们被用于催化 HO 对邻苯二胺（OPD 和 PPD）和对苯二胺（MPD）的氧化。反应产物具有不同的颜色（OPD 为黄色，PPD 为棕色），可以通过肉眼进行区分。相应的 OPD 和 PPD 氧化产物的典型吸收峰分别在 413nm 和 500nm。该方法对潜在干扰物具有出色的区分能力和选择性。OPD 和 PPD 的检测限分别为 1.1μM 和 1.9μM。各自的线性范围分别为 OPD 的 5 至 200μM 和 PPD 的 2.5 至 700μM。该方法已应用于加标天然水中 OPD 和 PPD 的定量分析。
