Study on Synthesis of Fluorescent Carbon Dots and Their Applications in Determination of Chlortoluron

KeyWord:carbon dots  plant soot  hydrothermal method  chlortoluron  fluorescence

Abstract:

      The carbon dots£¨CDs£©were synthesized by one step hydrothermal method using the plant soot as raw material.Effects of plant soot amount£¬concentration of H2O2 solution£¬pH value of reaction solution£¬reaction time and temperature were also discussed.The maximum excitation and emission wavelengths of CDs were 340 nm and 450 nm£¬respectively£¬and no red shift was observed with the increase of excitation wavelength.The Fourier-transform infrared£¨FTIR£© spectra characterization demonstrated that CDs contained lots of ¡ªCOOH and ¡ªOH groups on their surface.The synthesized CDs could be used as a tool for the detection on chlortoluron as their fluorescent intensity could be selectively quenched by chlortoluron.The linear range of the method for chlortoluron was 0.15-3.15 mg¡¤L-1£¬with a correlation coefficient£¨r2£© of 0.999 3 and a detected limit of 0.05 mg¡¤L-1.The proposed method was applied in the detection of chlortoluron in irrigation water samples with recoveries of 93.3%-112% and RSDs not more than 4.9%.Meanwhile£¬the influences of pesticides with similar structures to chlortoluron and common ions on the system were investigated£¬and the quenching mechanism for chlortoluron toward CDs was also discussed.