Details

Autor(en) / Beteiligte

• Huang, Zhiling
• Ying, Pengchen
• Huang, Lihui
• Xu, Qin
• Hu, Xiao-Ya

Titel

Molecularly imprinted polymer functionalized reduced graphene oxide: a new platform for the detection of hydroxyl radicals in the atmosphere

Ist Teil von

• Analytical methods, 2019-10, Vol.11 (4), p.5126-5133

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The hydroxyl radical (&z.rad;OH) is one of the most important oxidizing species in air whose concentration indicates the air quality. In this work, an indirect method was developed to determine &z.rad;OH based on the electrochemical signal of 2,5-dihydroxybenzoic acid (2,5-DHBA), a specific reaction product of salicylic acid and &z.rad;OH. The molecular imprinting technique was introduced into this work to improve the selectivity and sensitivity of this method. 2,5-DHBA was imprinted on reduced graphene oxide (rGO) via a simple electrochemical method by using pyrrole as the functional monomer. rGO not only provides abundant active sites for 2,5-DHBA imprinting but also improves the conductivity and mass transportation and increases the accessibility of active sites for 2,5-DHBA recognition. The differential pulse voltammetry (DPV) signals of 2,5-DHBA were used to evaluate the performance of the molecularly imprinted polymer (MIP) based sensor. The linear range for the concentration of 2,5-DHBA was from 5.0 × 10 −8 to 4.5 × 10 −5 M and the detection limit was down to 2.74 × 10 −9 M. A linearity for &z.rad;OH concentration ranging from 8.4 × 10 6 to 7.5 × 10 9 molecules per cm 3 was obtained. The low detection limit for &z.rad;OH was down to 4.6 × 10 5 molecules per cm 3 when using this sensor. The atmospheric &z.rad;OH concentration in Yangzhou has been successfully detected by this method. This work extended the molecularly imprinted polymers to the indirect detection of &z.rad;OH in the atmosphere with a simplified sample collection and detection process and good sensitivity. A simple electrochemical method based on MIP/graphene has been developed and successfully applied for atmospheric &z.rad;OH detection.