Preparation of Thiol groups Functionalized Gold Nanoparticles Stirring Bar and Its Application in Determination of Pb£¨¢ò£© and Cd£¨¢ò£©

KeyWord:gold nanoparticles  thiol groups functionalized  stir bar sorption  heavy mental ions

Abstract:

      In order to achieve the selective adsorption of heavy metal ions in environmental aqueous solution£¬a thiol groups functionalized gold nanoparticles metal stirring bar£¨AuNPs-SH-SBSE£© was fabricated by self assembling 1,8 octanedithiol on surface of the etched stainless steel deposited with gold nanoparticles£¨AuNPs£©.The extraction and separation properties of the stirring bar were evaluated with Pb£¨¢ò£© and Cd£¨¢ò£© by ICP-OES.Effects of adsorption time£¬pH value and desorption solvent on the adsorption were investigated.The results showed that£¬using equilibrium time of 30 min and an optimum pH of 8ª±0£¬6ª±0 mL 1ª±5 mol/L HNO3 as eluate£¬the maximal adsorption capacity of the stirring bar toward Pb£¨¢ò£© and Cd£¨¢ò£© reached to 98ª±5% and 87ª±4%£¬respectively.Under the optimal conditions£¬the method was successfully applied in the determination of trace Pb£¨¢ò£© and Cd£¨¢ò£© in real samples.There existed linearities for Pb£¨¢ò£© and Cd£¨¢ò£© in the ranges of 0ª±1-50 mg/L and 0ª±2-20 mg/L£¬with their limits of detection£¨S/N=3£© of 24 ng/L and 3ª±6 ¦Ìg/L£¬respectively.The recoveries at two spiked levels of 2ª±0 ¦Ìg/L and 5ª±0 ¦Ìg/L were in the ranges of 85ª±4%-105ª±0% and 74ª±2%-97ª±8%£¬with their RSDs£¨n=3£© of 3ª±8%-8ª±2% and 4ª±2%-10ª±6%£¬respectively.The method was simple£¬rapid and sensitive£¬and could be applied in the separation and detection of Pb£¨¢ò£© and Cd£¨¢ò£© in environmental water.