title: Electrogenerated chemiluminescence detection of trace level pentachlorophenol using carbon quantum dots.
abstract: Pentachlorophenol (PCP) is an environmental pollutant of serious concern due to its high toxicity and long persistence property. Fast and sensitive detection of PCP is therefore of great interest. In this work, carbon quantum dots (QDs) are synthesized by hydrothermal reaction, and characterized by fluorescence spectrophotometer, fourier transform infrared (FT-IR) spectroscopy, UV/vis/NIR spectrophotometer and scanning electron microscopy (SEM). The carbon QDs show stable and intensive electrogenerated chemiluminescence (ECL) in the presence of the coreactant S2O8(2-). Under the scanning potential of -1.2 to 0.5 V, PCP reacts with the excited C˙(-), resulting in a decrease in ECL. The detection of trace level PCP is therefore achieved using the carbon QDs and Pt working electrode. Parameters that may affect the ECL intensity including the pH of solution, ionic strength, concentrations of coreactant and carbon QDs are optimized. Under the optimal conditions, a detection limit of 1.3 × 10(-12) g L(-1) is achieved with a linear range of 10 pg L(-1)∼1.0 μg L(-1).
authors: State Key Lab of Chemo/Biosensing & Chemometrics, College of Chemistry & Chemical Engineering, Hunan University, Changsha 410082, China.
authors: Jiezhen
authors: J
authors: Li
authors: Niya
authors: N
authors: Wang
authors: ThanhThuy
authors: T
authors: Tran T
authors: Chen'an
authors: C
authors: Huang
authors: Lan
authors: L
authors: Chen
authors: Lijuan
authors: L
authors: Yuan
authors: Liping
authors: L
authors: Zhou
authors: Rui
authors: R
authors: Shen
authors: Qingyun
authors: Q
authors: Cai
mesh_terms: D002244:Carbon / Q000737:chemistry; D004785:Environmental Pollutants / Q000032:analysis*; D049449:Luminescence; D008163:Luminescent Measurements / Q000379:methods; D010416:Pentachlorophenol / Q000032:analysis* / Q000737:chemistry; D045663:Quantum Dots; D017550:Spectroscopy, Fourier Transform Infrared; D013431:Sulfates / Q000737:chemistry
chemical_list: D004785:Environmental Pollutants; D013431:Sulfates; D002244:Carbon; D010416:Pentachlorophenol