Electrochemical Detection of Cu Based on ZnO/PVA Nanocomposites and Doped by Cellulose Nanocrystals

Journal of Physics Conference Series, Journal Year: 2025, Volume and Issue: 2942(1), P. 012022 - 012022

Published: Feb. 1, 2025

Abstract River water must meet environmental and health standards for social uses such as drinking, bathing, agriculture, sanitation. However, many rivers are contaminated with hazardous substances like copper (Cu), which can be harmful in excess. This study aims to detect Cu samples using a Glassy Carbon Electrode (GCE) modified Zinc Oxide (ZnO), Polyvinyl Alcohol (PVA), doped Cellulose Nanocrystals (CNC). ZnO was selected its chemical stability, wide energy band gap, exciton binding energy. PVA, conductive polymer hydroxyl groups, used enhance the surface area, while CNC increased heavy metal adsorption. The ZnO/PVA/CNC nanocomposite synthesized via hydrothermal method characterized Scanning Electron Microscopy (SEM) Energy Dispersive X-ray Spectroscopy (EDS). Electrochemical properties were tested Cyclic Voltammetry (CV) Square Wave (SWV) Corrtest potentiostat. applied thin film modify working electrode GCE measurements. CV results showed limit of detection (LOD) 4.12 ppm coefficient determination (R2) 0.98758, SWV measurements produced an LOD 2.52 R2 0.81282. These findings demonstrate potential ZnO/PVA/CNC-modified electrodes detecting samples.

Language: Английский

GCE Modified by Graphene-doped ZnO/PVA Nanocomposites for Highly Sensitive Pb Detection

Journal of Physics Conference Series, Journal Year: 2025, Volume and Issue: 2942(1), P. 012018 - 012018

Published: Feb. 1, 2025

Abstract Heavy metals, including lead (Pb), have contaminated a number of rivers that provide drinking water to the residents West Java. Even at low amounts, is dangerous heavy metal. It crucial detect Pb in liquid samples for this reason. Using three electrodes—the Working Electrode (WE), Counter (CE), and Reference (RE)—an electrochemical approach was used presence Pb. A modification performed WE order improve sensitivity, selectivity, response time detection. This work modified using ZnO/PVA nanocomposites doped with graphene. ZnO frequently nanomaterial has been shown metal detection sensitivity. band-gap energy 3.37 eV high electron mobility about 3 cm 2 /V.s. also surface area, which makes it possible positively charged ions attach active sites. nanoparticles are treated PVA create flexible surfaces. To increase electrical conductivity nanocomposites, graphene can be as doping agent. In work, thin film synthesized from 0.1 grams ZnO, 1.5 PVA, 0.324 The contents then examined an Scanning Electron Microscope (SEM) Energy Dispersive Spectrophotometer (EDS), respectively. film’s characteristics were investigated through application Cyclic Voltammetry (CV) Square Wave (SWV). CV SWV technique results clearly indicate will involved redox reaction via M NaOH. peak anodic current oxidation increases concentration Pb, according two methods detecting concentrations 0, 0.5, 2, 3, 4, 5 ppm. These showed better sensitivity capabilities than those without.

Language: Английский

Detection of highly sensitive Escherichia coli (E. coli) bacteria using an electrochemical sensor based on zinc oxide/polyvinyl alcohol nanocomposite

Microchemical Journal, Journal Year: 2024, Volume and Issue: unknown, P. 112044 - 112044

Published: Oct. 1, 2024

Language: Английский