article · Chinese Journal of Analytical Chemistry
A zinc and iron layered double hydroxide combined with polyaniline creates a cost-effective nanocomposite designed for detecting heavy metal pollutants in water. Used as a modifier for carbon paste electrodes, the material enables the electrochemical detection of lead ions across a linear concentration range of 1 to 80 micromolar. Electrochemical testing established a detection limit of 167.8 nanomolar and a quantification limit of 559.4 nanomolar for dissolved lead. Cost evaluations indicate the modified carbon paste electrode costs roughly 1.25 US dollars to produce, which is under 0.1 percent of the expense involved in using standard laboratory equipment like inductively coupled plasma or atomic absorption spectrometry to monitor metal removal. This low-cost material offers an efficient alternative for water analysis without requiring bulky, expensive off-site laboratory instrumentation.
Standard analytical techniques for detecting toxic heavy metals in water rely on expensive, stationary laboratory instruments that require specialised operation. Developing an electrode coating that costs just 1.25 US dollars allows sensitive monitoring of toxic lead at nanomolar levels. This approach provides an affordable route for routine water quality testing, making pollution monitoring far more accessible for environmental protection and industrial waste management.
The material is aimed at on-site wastewater monitoring, enabling portable, low-cost water quality testing devices that use disposable electrodes. Potential users include environmental testing agencies, wastewater treatment plant operators, and industrial facilities monitoring heavy metal discharge. While the nanocomposite has been synthesised, characterised, and tested at laboratory scale for electrochemical performance, development into a field-ready portable sensor remains at an applied research stage.
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There is an urgent need to develop multifunctional cost-effective nanomaterials and nanocomposites that can be used in numerous applications while showing high efficiency and cheaper implementation compared to conventional techniques and/or materials. In this work, zinc/iron layered double hydroxide (LDH) and polyaniline (PANI) were synthesized as a model LDH/conductive polymer nanocomposite, which is a promising family of cheap multifunctional materials. This electrochemical properties of this nanocomposite was investigated for detection of heavy metal (HM) ions in water streams, using lead as a model HM . In the present work, zinc/iron LDH and PANI was assigned as carbon paste electrode modifier. The composite was fully characterized using various characterization techniques including X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier transform InfraRed (FTIR). The electrochemical redox reactions of lead (II) ions at the modified electrode interface were investigated using cyclic voltammetry (CV), differential pulse voltammetry (DPV), Accordingly, a linear relation of Pb2+ ions was achieved in the concentration range 1–80 µM with limit of detection (LOD) was 167.8 nM and limit of quantification (LOQ) was 559.4 nM. Furthermore, the cost of using such material for lead removal using a typical adsorption study was compared to using conventional inductively coupled plasma (ICP) or atomic absorption spectrometry (AAS) equipment for tracking HM removal during the adsorption process. Cost analysis revealed that the final overall cost of the modified carbon paste electrode is estimated as 1.25 USD. This cost represents less than 0.1% of the total cost required to conduct the same adsorption study using a typical ICP or AAS equipment. This composite can pave the road towards portable measurements for onsite detection of wastewater pollutants using cheap disposable-electrodes as compared to massive expensive off site equipment such as ICP and AAS.
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DOI: 10.1016/j.cjac.2024.100368
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