检出限
荧光
墨鱼
硫黄
量子点
猝灭(荧光)
材料科学
硝基苯酚
碳量子点
热液循环
线性范围
碳纤维
化学
分析化学(期刊)
光化学
纳米技术
化学工程
色谱法
光学
有机化学
工程类
催化作用
复合材料
物理
复合数
食品科学
作者
Xiaotong Huang,Chao Yang,Yingxin Chen,Zhu Zebin,Lihua Zhou
出处
期刊:Analytical Methods
[The Royal Society of Chemistry]
日期:2021-01-01
卷期号:13 (44): 5351-5359
被引量:14
摘要
Para-nitrophenol (PNP) is an important raw material for organic synthesis and its extensive use has produced a series of environmental problems. Here, we develop a highly sensitive and selective fluorescent detection method for PNP with cuttlefish ink-based carbon quantum dots (CQDs). The cuttlefish ink, which is rich in eumelanin, is utilized as the only precursor to synthesize the CQDs via a one-step hydrothermal method. The resultant CQDs were co-doped with nitrogen and sulfur and exhibited excellent fluorescence properties. Two optimal emissions can be observed at the excitation/emission wavelengths of 320/385 nm and 390/465 nm, respectively. In the presence of PNP, the two emissions are remarkably quenched. PNP can be measured in the linear detection concentration range of 1.25-50 μM (Em = 385 nm and R2 = 0.9884) or 1.25-27.5 μM (Em = 465 nm and R2 = 0.9818) with a detection limit of 0.05 μM. Significantly, it is found that a much wider linear detection range of 0.05-125 μM with a lower detection limit of 0.039 μM (3σ/k) can be achieved when log(I385 nm + I465 nm) was utilized to quantify PNP. The investigations of the sensing mechanism suggested that the inner filter effect and photoinduced electron transfer of PNP and N,S-CQDs leads to fluorescence quenching. The sensing method is successfully applied for PNP detection in real water samples with satisfactory recoveries (91.18-103.14%). A new sustainable waste-prevention strategy of cuttlefish ink and a feasible alternative to PNP detection methods is provided in this article.
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