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

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• 作者：Thatyara Oliveira Monteiro ; Sakae Yotsumoto Neto ; Flá ; vio Santos Damos ; ^{flavio.damos@yahoo.com" class="auth_mail" title="E-mail the corresponding author} ; Rita de Cá ; ssia Silva Luz ; ^{rita_rcsluz@yahoo.com.br" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Photoelectrochemical sensor ; Visible LED light ; LiTCNE/TiO2 ; TBHQ ; BHA ; BHT
• 刊名：Journal of Electroanalytical Chemistry
• 出版年：2016
• 出版时间：1 August 2016
• 年：2016
• 卷：774
• 期：Complete
• 页码：36-41
• 全文大小：886 K

文摘

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 sensor showed high anodic photocurrent to TBHQ under visible LED light irradiation in comparison to pure anatase TiO₂ nanoparticles 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 μmol L^− 1 with a sensitivity of 0.01 μA L μmol^− 1 and limit of detection of 100 nmol L^− 1 for the detection of TBHQ. The photoelectrochemical sensor showed high photocurrent to TBHQ in comparison to photocurrent response to butylated hydroxyanisole (BHA) and butyl-hydroxytoluene (BHT). The present LiTCNE/TiO₂ 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.