Development of a photoelectrochemical sensor for detection of TBHQ antioxidant based on LiTCNE-TiO2 composite under visible LED light

作者：Monteiro Thatyara Oliveira; Yotsumoto Neto Sakae; Damos Flavio Santos^*; Silva Luz Rita de Cassia

来源：Journal of Electroanalytical Chemistry, 2016, 774: 36-41.

DOI：10.1016/j.jelechem.2016.05.013

• Photoelectrochemical sensor
• Visible LED light
• LiTCNE/TiO2
• TBHQ, BHA, BHT

In this work, a novel photoelectrochemical sensor for detection of tert-butylhydroquinone (TBHQ) based on anatase titanium dioxide (TiO2) nanoparticles sensitized with lithium tetracyanoethylenide-(LiTCNE/TiO2) was developed. The LiTCNE/TiO2 photoelectrochemical sensorshowed high anodic photocurrent to TBHQ-under visible LED light irradiation in comparison to pure anatase TiO2-nanopartides or pure LiTCNE. The LiTCNE/TiO2 composite shows a photocurrent to TBHQ about 28 times higher than that observed to TiO2 nanoparticles and 4-fold higher than that observed to LiTCNE modified electrode. The LiTCNE/TiO2 composite showed a low charge transfer, resistance in comparison to their individual components. Under optimized conditions, the photoelectrochemical sensor shows a linear response range from 0.4 up to 500 mu mol L-1 with a sensitivity of 0.01 mu A L mu mol(-1) and limit of detection of 100 nmol L-1 for the detectioh of TBHQ The photolectrochemical sensor showed high photocurrent to TBHQ in comparison to photocurrent response to butylated hydroxyanisole (BHA) and butyl-hydroxytoluene (BHT). The present-LiTCNE/FiO(2) photoelectrochemical sensor was successfully applied to biodiesel samples, with recovery values between 96.8% and 98.2%. The results obtained were found to be similar to those obtained using the spectrophotometric method with agreement at 95% confidence level.

• 出版日期2016-8-1