Detection of 2,4-dichlorophenoxyacetic acid in water sample by organosilane based silica nanocomposites

• Published in: The Science of the total environment 2023-02, Vol.858, p.159594-159594, Article 159594
• Main Authors: Singh, Gurjaspreet, Sharma, Sanjay, Singh, Akshpreet, Mohit, Devi, Anita, Gupta, Sofia, Malik, Pooja, Khurana, Sumesh, Soni, Sajeev
• Format: Article
• Language: English
• Subjects: 2,4-Dichlorophenoxyacetic acid; Cycloaddition reaction; Fluorescence; Organosilane; Silica nanoparticles
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2022.159594

The present study aims to produce nanocomposites of silica based organosilane as sensitive and selective fluorescent sensor for the recognition of 2,4 dichlorophenoxyacetic acid (2,4-D). Hydrazone tethered triazole functionalized organosilane has been synthesized by the condensation reaction of 4-hydroxybenzaldehyde and phenyl hydrazine followed by Cu(I) catalysed cycloaddition of azide with alkyne. The prepared compound has been further grafted over silica surface and the synthesized materials were characterized by FT-IR, NMR (1H and 13C), XRD, mass spectrometry and FE-SEM spectral analyses. The prepared organosilane and its HSNPs have been utilized as an effective emission probe for the selective detection of 2,4 D with good linear relationship in the range of 0–160 μM and 0–115 μM and LOD value of 46 nM and 13.5 nM respectively. In the presence of other active species, the sensor shows minimal interference while the comparison with the previously reported techniques suggests it to be more desirable for the sensitive and selective detection of 2,4 D. Further, the real sample application for detection of 2,4 D was analyzed in field water and the HSNPs based sensing system gave recovery percentage of above 98 %. The present article involves synthesis and characterization of organosilane and its nanoparticles for the selective detection of 2,4 dichlorophenoxyacetic acid. [Display omitted] •Organosilane and its hybrid silica nanocomposites have been synthesized and well characterized.•Sensing studies surpassed the prepared molecules to be ideal receptor for 2,4 D recognition.•The probe also showed low limit of detection, wide linear range and negligible interference.•The detection of 2,4 D in field water paves the way for its application in real samples.