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Electrochemical sensors of environmental pollutants based on carbon electrodes modified by ordered mesoporous silica

Abstract : In this thesis, we present the electrochemical detection of herbicides i.e. paraquat and isoproturon in aqueous samples. These herbicides are used worldwide extensively for weed control in different crops. Their intensive use is a source of environmental contamination and their toxicity is a threat to Human health. Electrochemical sensing is a promising and advantageous technique as compared to conventional detection methods due to its properties such as rapid analysis, ease of operation, cost effectiveness and high sensitivity as a result of working electrode modification. Here, we modified electrodes modified with mesoporous silica thin films to act as herbicide sensors. These electrodes were modified by electrochemically assisted self-assembly process, a well-established process for electrode modification by our group. In the first part adhesion of mesoporous silica film at carbon electrodes was improved with the help of a primary amine which acted as molecular glue for better attachment of these films at electrodes surface. In the next part these modified electrodes were used for electrochemical detection of above stated herbicides. Modified electrodes showed enhanced sensitivity and low limit of detection as compared to unmodified ones. Effect of different solution parameters as well as film thickness and electrode geometry was also studied and found to have critical impact on sensitivity of the system
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Submitted on : Friday, September 7, 2018 - 3:02:07 PM
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  • HAL Id : tel-01870374, version 1

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Tauqir Nasir. Electrochemical sensors of environmental pollutants based on carbon electrodes modified by ordered mesoporous silica. Analytical chemistry. Université de Lorraine, 2018. English. ⟨NNT : 2018LORR0089⟩. ⟨tel-01870374⟩

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