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A nitrogen doped carbon quantum dot-enhanced chemiluminescence method for the determination of Mn2+
Analytical Methods ( IF 3.1 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1039/c7ay02806g
Junmei Zhang 1, 2, 3, 4 , Xiaoxia Chen 1, 2, 3, 4 , Yue Li 1, 2, 3, 4 , Suqin Han 1, 2, 3, 4 , Yao Du 3, 4, 5, 6 , Haizhen Liu 3, 4, 5, 6
Affiliation  

Nitrogen doped carbon quantum dots (NCQDs) were synthesized via an ultrasonic method with ascorbic acid as the carbon source and ammonia as the nitrogen source. The synthesized NCQDs could significantly enhance the chemiluminescence (CL) reaction between luminol and KMnO4 under alkaline conditions based on its catalysis. The increased CL intensity also depended on the synthetic temperature and time of NCQDs. Trace amounts of Mn2+ could cause a visible restraining of the CL intensity of the NCQD–KMnO4–luminol system because of the formation of complexes between Mn2+ and some groups such as NH– and CH2– on the surface of NCQDs, which resulted in the aggregation of NCQDs and scavenging of O2˙ free radicals and then the catalytic capacity reduction of NCQDs. Under optimum conditions, the decrease in CL intensity was proportional to the concentration of Mn2+ in the range of 0.3 to 50.0 µM. The detection limit (3σ) was 43.0 nM. The feasibility of the method was also demonstrated for determining Mn2+ concentration in water samples.

中文翻译:

氮掺杂碳量子点增强化学发光法测定Mn 2+

以抗坏血酸为碳源,氨为氮源,通过超声法合成了氮掺杂碳量子点(NCQDs)。在碱性条件下,合成的NCQDs可以催化鲁米诺与KMnO 4之间的化学发光(CL)反应。CL强度的增加还取决于NCQD的合成温度和时间。痕量的Mn 2+可能会导致NCQD–KMnO 4 –鲁米诺系统的CL强度的可见抑制,因为Mn 2+与某些基团(例如NH–和CH 2)之间形成了络合物- NCQDs的表面上,这导致NCQDs的聚集和的O-清除上2 ˙ -自由基,然后NCQDs的催化能力降低。在最佳条件下,CL强度的降低与Mn 2+的浓度在0.3至50.0 µM的范围内成正比。检出限()为43.0 nM。还证明了该方法用于测定水样品中Mn 2+浓度的可行性。
更新日期:2018-01-05
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