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Kitchen Waste-Derived Oxygen-Doped Fluorescent Carbon Quantum Dots for Ultra-Trace Detection of Chromium(VI) in Environmental Water Matrices

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Developing a green sensor using agro-industrial and kitchen wastes is a novel approach to maintain sustainability and overcome the cost of the available chemical-based sensors. Hexavalent chromium determination is crucial for public health due to widespread sources and high toxicity, yet challenges remain in detection due to interference from nontarget ions and complex matrices. In this report, we synthesized garlic peel-derived water-dispersed blue-emitting carbon quantum dots, having an approximate diameter of 4 nm and functionalized with carbonyl, hydroxyl, and carboxylic acid groups. The prepared materials are useful for selective and sensitive detection of the most toxic hexavalent chromium ions in real water samples. The sensing method was validated linearly over a concentration range of 7–100 μM, with the limit of detection and the limit of quantification values of 95.14 and 317.92 ppb, respectively. This fluorescence sensing platform demonstrated a strong anti-interference capability under real and controlled laboratory experimental conditions. The effectiveness of the proposed fluorescence-quenching-based technique was also confirmed by benchmarking its results with inductively coupled plasma optical emission spectroscopy. The proposed sensor’s efficiency with environmental samples highlights it as a promising candidate for future market implementation.

Source: ACS Sustainable Resource Management

DOI: 10.1021/acssusresmgt.5c00310

Authors: Tuhin Mandal, Rabi Narayan Senapati, Ashish Kumar Ghosh, Reginald Ebhin Masto, Vikram Singh

Institutions: Central Institute of Mining and Fuel Research, Council of Scientific and Industrial Research, Academy of Scientific and Innovative Research, Indian Institute of Toxicology Research

Language: English

Topic: Carbon and Quantum Dots Applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDGs: Clean water and sanitation, Responsible consumption and production

Open Access status: bronze

Funders: Indian Institute of Technology Roorkee, Indian Institute of Technology (Indian School of Mines), Dhanbad, CSIR-Central Institute of Mining and Fuel Research