Development of a photoelectrochemical sensor for detection of TBHQ antioxidant based on LiTCNE-TiO2 composite under visible LED light
| Autor: | Rita de Cássia Silva Luz, Flavio Santos Damos, Thatyara Oliveira Monteiro, Sakae Yotsumoto Neto |
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| Rok vydání: | 2016 |
| Předmět: |
Detection limit
Photocurrent Anatase Chemistry General Chemical Engineering Composite number Analytical chemistry Nanoparticle chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Analytical Chemistry chemistry.chemical_compound Electrode Electrochemistry Lithium Butylated hydroxyanisole 0210 nano-technology Nuclear chemistry |
| Zdroj: | Journal of Electroanalytical Chemistry. 774:36-41 |
| ISSN: | 1572-6657 |
| DOI: | 10.1016/j.jelechem.2016.05.013 |
| Popis: | In this work, a novel photoelectrochemical sensor for detection of tert -butylhydroquinone (TBHQ) based on anatase titanium dioxide (TiO 2 ) nanoparticles sensitized with lithium tetracyanoethylenide (LiTCNE/TiO 2 ) was developed. The LiTCNE/TiO 2 photoelectrochemical sensor showed high anodic photocurrent to TBHQ under visible LED light irradiation in comparison to pure anatase TiO 2 nanoparticles or pure LiTCNE. The LiTCNE/TiO 2 composite shows a photocurrent to TBHQ about 28 times higher than that observed to TiO 2 nanoparticles and 4-fold higher than that observed to LiTCNE modified electrode. The LiTCNE/TiO 2 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/TiO 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. |
| Databáze: | OpenAIRE |
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