In this research, an electrochemical sensor was fabricated employing the metal-organic framework (MOF) deposited glassy carbon electrode (GCE) for the sensing copper ions in water with high sensitivity. The porous nanostructured MOF was characterized through Transmission electron microscope, scanning electron microscope and X-ray diffraction analysis. The Bi-MOF nanostructure deposited GCE (Bi-MOF/GCE) was fabricated by drop-casting a suspension of Bi-MOF in water on GCE surface. The performance of modified electrode in the presence and absence of heavy metal ions such as Cd, Hg As, Pb and Cu was determined by the cyclic voltammetry in deionised water within the scan rate range of 25 and 300 mVs. The Bi-MOF/GCE displayed highest anodic and cathodic peak current for Cu ions than other metal ions, which was enhanced linearly within the scan rate range of 10-100 mV s. Under the employed experimental conditions, the fabricated Bi-MOF/GCE based electrochemical sensor showed an outstanding routine in the determination of copper with a lowest sensing limit of 1 × 10 M, wide linear range variation, strong interaction between metal ions and Bi-MOF. It has long-term stability and good reproducibility. The Bi-MOF/GCE electrode was successfully tested to detect Cu in tap water with acceptable results.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.fct.2022.113313 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Visual detection of ciprofloxacin using a multi-emission ratiometric fluorescence sensor based on the molecularly imprinted polymers doped with terbium(III) ions.
Talanta
January 2025
School of Pharmacy, Binzhou Medical University, Yantai, 264003, China. Electronic address:
Ciprofloxacin (CIP) is a commonly used antibiotic, but its abuse may cause bacterial resistance, posing a high risk to the environment and human health. Herein, based on the molecular imprinting technology, this study proposed a ratiometric fluorescence sensor employing the "post-doping" strategy, which aims to be rapid, selective, and visually easy-to-use for CIP detection to address antibiotic residues and environmental risks. Specifically, by exploiting the "antenna effect" of lanthanide metal ions (Ln), terbium (III) (Tb) chosen as a fluorescence-assisted functional monomer as well as the red emitting CdTe quantum dots (QDs) as the internal reference signal were introduced into multi-emission Tb-CdTe@SiO@MIPs (TbMIPs).
View Article and Find Full Text PDFDNAzyme-mediated isothermal catalytic hairpin assembly for rapid and enzyme-free amplified detection of lead(Ⅱ) ion.
J Hazard Mater
January 2025
Shanghai Engineering Research Center of Aquatic-Product Processing & Preservation, Shanghai Ocean University, Shanghai 201306, China; Laboratory of Quality and Safety Risk Assessment for Aquatic Product on Storage and Preservation (Shanghai), Ministry of Agriculture, Shanghai Ocean University, Shanghai 201306, China; Shanghai Ocean University, Shanghai 201306, China. Electronic address:
The detection of heavy metal ions, particularly lead (Pb²⁺), in environmental samples is crucial for public health and safety. Current nucleic acid signal amplification methods for Pb²⁺ detection often rely on biological enzymes and are limited in applicability due to high costs, prolonged detection times, and nonspecific adsorption. In this study, we introduce an enzyme-free, DNAzyme-mediated isothermal catalytic hairpin assembly (DMICHA) assay, which combines a DNAzyme-based Pb²⁺ recognition module with a signal amplification process utilizing isothermal catalytic hairpin assembly (CHA).
View Article and Find Full Text PDFNative ion channels play key roles in biological systems, and engineered versions are widely used as chemogenetic tools and in sensing devices . Protein design has been harnessed to generate pore-containing transmembrane proteins, but the capability to design ion selectivity based on the interactions between ions and selectivity filter residues, a crucial feature of native ion channels , has been constrained by the lack of methods to place the metal-coordinating residues with atomic-level precision. Here we describe a bottom-up RFdiffusion-based approach to construct Ca channels from defined selectivity filter residue geometries, and use this approach to design symmetric oligomeric channels with Ca selectivity filters having different coordination numbers and different geometries at the entrance of a wide pore buttressed by multiple transmembrane helices.
View Article and Find Full Text PDFManganese (Mn)-sensing riboswitches protect bacteria from Mn toxicity by upregulating expression of Mn exporters. The Mn aptamers share key features but diverge in other important elements, including within the metal-binding core. Although X-ray crystal structures of isolated aptamers exist, these structural snapshots lack crucial details about how the aptamer communicates the presence or absence of ligand to the expression platform.
View Article and Find Full Text PDFJunctional Role of Anionic Domain of Mussel Foot Protein Type 4 in Underwater Mussel Adhesion.
Biomacromolecules
January 2025
Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 37673, Republic of Korea.
Mussel byssi form a robust underwater adhesive system, anchoring to various surfaces in harsh marine environments. Central to byssus is foot protein type 4 (fp-4), a junction protein connecting collagenous threads to proteinaceous plaque. This study investigated an anionic plaque-binding domain of fp-4 (fp-4a) and its interactions with cationic foot proteins (fp-1, fp-5, and fp-151 as model substitutes for fp-2) and metal ions (Ca, Fe, and V).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!