Tetracycline Fluorescent Sensor Using Tomato Stalk Carbon Dots #Sciencefather #Researcherawards

Introduction

Biomass-derived carbon dots (CDs) have emerged as a promising class of eco-friendly nanomaterials for sensitive and selective detection of environmental contaminants. In this study, tomato straw waste was effectively converted into fluorescent CDs with remarkable optical properties, enabling their application in sensing technologies. By incorporating a molecularly imprinted polymer (MIP) layer, the material gains highly selective binding capabilities, making it ideal for the detection of tetracycline (TC), a widely used antibiotic and a major environmental pollutant. This work demonstrates not only the valorization of agricultural residues but also the advancement of sustainable nanotechnology for environmental monitoring.

Biomass-Derived Carbon Dots: Structure and Fluorescent Properties

Carbon dots synthesized from tomato straws exhibit excellent fluorescence stability, uniform particle size, and high quantum yield. Their abundant surface functional groups enable strong interaction with polymers, making them suitable for composite formation. The conversion of biomass into CDs also reduces environmental impact, offering a green alternative to chemically derived nanomaterials. Their superior optical behavior forms the foundation for advanced sensing applications.

Fabrication of the CDs@SiO2-MIP Composite Sensor

The construction of the sensor involves immobilizing a silica-based molecularly imprinted polymer onto the surface of CDs. This SiO2-MIP layer contains cavities that match the shape, size, and functional groups of tetracycline molecules. The integration of MIPs onto CDs effectively combines selective adsorption sites with strong fluorescent signals, producing a hybrid sensor with enhanced recognition capabilities and stable performance under various environmental conditions.

Fluorescence Quenching Mechanism for Tetracycline Detection

The sensing mechanism relies on fluorescence quenching, where the fluorescence intensity of CDs decreases as tetracycline binds to the molecularly imprinted cavities. This “off-fluorescent” response results from the specific interaction between TC and recognition sites formed during imprinting. The fluorescence quenching is consistent and concentration-dependent, making the sensor highly sensitive and suitable for real-time environmental monitoring.

Analytical Performance and Detection Sensitivity

Under optimized experimental conditions, the CDs@SiO2-MIP sensor demonstrates an impressive linear detection range from 1.00 × 10⁻⁷ to 5.00 × 10⁻⁴ mol/L. The limit of detection (LOD) is as low as 9.33 × 10⁻⁸ mol/L, highlighting its potential for trace-level identification of tetracycline in environmental samples. The sensor’s excellent selectivity is due to the highly specific imprinted sites, which distinguish TC from structurally similar molecules.

Environmental Significance and Future Prospects

This study introduces a sustainable strategy to transform biomass waste into valuable nanomaterials for environmental pollutant detection. The CDs@SiO2-MIP sensor offers a simple, low-cost, and highly efficient method for monitoring tetracycline contamination in water systems. Future research may explore multi-target sensing platforms, scaling up production, and integrating the sensor into portable devices for on-site environmental assessment.

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#Sciencefather, #Reseacherawards, #CarbonDots, #BiomassNanomaterials, #MolecularImprinting, #TetracyclineDetection, #FluorescentSensor, #EnvironmentalMonitoring, #Nanotechnology, #SustainableMaterials, #TomatoStrawCDs, #EcoFriendlySensors, #FluorescenceQuenching, #AnalyticalChemistry, #EnvironmentalPollutants, #AntibioticResidues, #GreenSynthesis, #SiO2MIP, #NanoSensors, #WaterQualityAnalysis, #PollutantDetection, #EnvironmentalSafety,

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