Fabrication of a Reusable Carbon Dot/Gold Nanoparticle/Metal–Organic Framework Film for Fluorescence Detection of Lead Ions in Water

Abstract

Solid-state sensing platforms are desirable for the development of reusable sensors to promote public health measures such as testing for drinking water contamination. A bioinspired metal–organic framework (MOF)-based material has been developed by imitating metal–protein interactions in biological systems to attain high sensitivity and selectivity to Pb2+ through fluorescence sensing. A zirconium terephthalate-type framework (also known as NH2-UiO-66) was modified with both gold nanoparticles and thiol-functionalized carbon dots to give HS-C/Au­(x)/UiO-66 composites with different Au content (x) and were subsequently adapted into films that show extraordinary sensitivity to Pb2+. The HS-C/Au(1.4)/UiO-66 film that consists of 1.4 wt % Au shows a quenching response with the limit of detection of 80 parts per trillion and sustained performance for five cycles. Moreover, the fluorescence response of the HS-C/Au­(x)/UiO-66 film to Pb2+ can be reversed from emission quenching to enrichment of fluorescence by increasing the Au content. The performance of the HS-C/Au­(x)/UiO-66 film as a solid-state sensor demonstrates its potential for application in reusable sensing devices to ensure public safety from Pb2+ contamination in drinking water.

Multidimensional MOF-derived carbon nanomaterials for multifunctional applications

“…15a). 192 The surface plasmon resonance of the metal NPs combines with the fluorescence signal where the film of its powder shows a significant change in fluorescence intensity, which is used to selectively detect the Pb( ii ) ions as shown in Fig. 15b.…”

Modification of Carbon Dots for Metal‐Ions Detection

“…Cara M. Doherty et al reported the HS-C/Au(x)/UiO-66 composite film as a solid-state sensor for Pb 2 + detection. [88] Pb 2 + could cause fluorescence quenching of the sensor HS-C/Au(x)/UiO-66 due to the energy Figure 6. The synthetic route of the CDs, CDs@Eu-MOFs and detection mechanism for Hg 2 + .…”

Comparative Evaluation of Bioefficiency and Photocatalytic Activity of Green Synthesized Bismuth Oxide Nanoparticles Using Three Different Leaf Extracts

“…Globally, water contamination and its treatment have emerged as a growing concern. In recent decades, remarkable efforts have been made to overcome the challenges of wastewater treatment, as the water pollution level has risen due to an influx of pathogenic microorganisms and toxic pollutants entering the regular water cycle in aquatic environments, which has dire implications for both terrestrial aquatic and ecosystems. − It is well documented in the literature that wastewater sources are one of the largest conceivable water resources, and their reuse is expected to offset the need for more clean water . In light of these facts, a number of technologies such as sedimentation, coagulation, filtration, adsorption, and membrane technologies have been developed for wastewater treatment; however, they have high operating costs and can introduce dangerous secondary contaminants into the biological system. , …”