Abstract
In this work, chitosan dithiocarbamate (CSDTC) derivative was successfully synthesized by mixing chitosan with carbon disulfide and ammonia at 45°C. Then, CSDTC (40μL, 1.0mg/mL) was added into Au NPs solution to obtain the chitosan dithiocarbamate functionalized gold nanoparticles (CSDTC-Au NPs). The Cd2+ ion was quickly induced the aggregation of CSDTC-Au NPs at PBS pH 8.0, which facilitates to develop a simple and selective colorimetric method for detection of Cd2+ ion. As a result, the characteristic surface plasmon resonance (SPR) peak of CSDTC-Au NPs at 523nm was red-shifted to 685nm, yielding a color change from red to blue. Under the optimized conditions, a linear relationship (R2=0.9991) was observed between the absorbance ratio at A685nm/A523nm and the concentration of Cd2+ in the range of 50–500μM. The limit of detection was found to be 63nM. Furthermore, CSDTC-Au NPs was applied to determine Cd2+ ion in water samples (drinking, tap, canal, river and industrial efluent).
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