Nanostructured Materials for the Assay of Organic/Inorganic Water Pollutants

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Environmental Nanoscience and Nanotechnology".

Deadline for manuscript submissions: closed (20 June 2024) | Viewed by 3661

Special Issue Editors


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Guest Editor
National Institute for Research and Development of Isotopic and Molecular Technologies, Donat Street, No. 67-103, 400293 Cluj-Napoca, Romania
Interests: nanomaterials; nanotechnology; carbon-based materials preparation and characterization; graphene; green chemistry; electrochemistry; detection protocols; sensors; graphene-based modified electrodes; electrochemical mechanisms; portable sensing solutions; food science; polyphenols; nanomedicine
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
National Institute for Research and Development of Isotopic and Molecular Technologies, Donat Street, No. 67-103, RO-400293 Cluj-Napoca, Romania
Interests: graphene synthesis by electrochemical methods; graphene-modified electrodes; electrochemical detection of biomolecules (e.g., adenine; guanine; dopamine); pharmaceutical drugs and organic polutants
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Environmental pollution is regarded as one of the most pressing issues threatening the ecology, biodiversity and human health. Water contamination has been a challenging problem to handle as a result of constant industrialization. Inorganic and organic pollutants are long-lasting hazardous contaminants that endanger biotic communities, including humans. As the human population grows and living standards improve, so does the need for fresh water. Therefore, water contamination is a major worldwide issue which requires continuous assessment and amendment of water resource policy at all levels. Thorough and strict water quality monitoring is essential part tailored to avoid the detrimental ecological impacts and custom-made composites or hybrid nanomaterials with target-specific characteristics are trustworthy and stable choices for environmental mitigation. In this given context, the aim of this Special Issue is to broaden the knowledge on water pollution, giving an insight on the sensitive detection and quantification tools for trace levels of water matrix contaminants, as well as on nanomaterials specifically designed for organic/inorganic pollutants assay. We invite authors to submit both original research, and review articles based on nanostructured materials applicability for the analysis of water samples; classic procedures recognized as safety control techniques; development and validation of new protocols and alternative methods that consist either of the involvement of innovative experimental setups or advanced data processing tools.

Dr. Lidia Magerusan
Dr. Stela-Maria Pruneanu
Guest Editors

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Keywords

  • nanostructured materials
  • water pollution
  • water analysis
  • electrochemical detection
  • carbon-base materials
  • organic pollutants
  • inorganic pollutants

Published Papers (3 papers)

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Research

15 pages, 2884 KiB  
Article
Electrochemical Detection of Glyphosate in Surface Water Samples Based on Modified Screen-Printed Electrodes
by Elisabeta-Irina Geana, Corina Teodora Ciucure, Amalia Soare, Stanica Enache, Roxana Elena Ionete and Livia Alexandra Dinu
Nanomaterials 2024, 14(11), 948; https://doi.org/10.3390/nano14110948 - 28 May 2024
Viewed by 620
Abstract
This study addresses the necessity to monitor the presence of glyphosate (Gly) in waters, highlighting the need for on-site detection of Gly by using electrochemical sensors in environmental and agricultural monitoring programs. Two approaches were employed: (1) modification with graphene decorated with gold [...] Read more.
This study addresses the necessity to monitor the presence of glyphosate (Gly) in waters, highlighting the need for on-site detection of Gly by using electrochemical sensors in environmental and agricultural monitoring programs. Two approaches were employed: (1) modification with graphene decorated with gold nanoparticles (AuNPs-Gr) and dispersed in either dimethylformamide (DMF) or a solution containing Nafion and isopropanol (NAF), and (2) molecularly imprinted polymers (MIPs) based on polypyrrole (PPy) deposited on gold SPEs (AuSPE). Electrochemical characterization revealed that sensors made of AuNPs-Gr/SPCE exhibited enhanced conductivity, larger active area, and improved charge transfer kinetics compared to unmodified SPEs and SPEs modified with graphene alone. However, the indirect detection mechanism of Gly via complex formation with metallic cations in AuNPs-Gr-based sensors introduces complexities and compromises sensitivity and selectivity. In contrast, MIPPy/AuSPE sensors demonstrated superior performance, offering enhanced reliability and sensitivity for Gly analysis. The MIPPy/AuSPE sensor allowed the detection of Gly concentrations as low as 5 ng/L, with excellent selectivity and reproducibility. Moreover, testing in real surface water samples from the Olt River in Romania showed recovery rates ranging from 90% to 99%, highlighting the effectiveness of the detection method. Future perspectives include expanding the investigation to monitor Gly decomposition in aquatic environments over time, providing insights into the decomposition’s long-term effects on water quality and ecosystem health, and modifying regulatory measures and agricultural practices for mitigating its impact. This research contributes to the development of robust and reliable electrochemical sensors for on-site monitoring of Glyphosate in environmental and agricultural settings. Full article
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24 pages, 4642 KiB  
Article
Electrochemical Detection of Cd2+, Pb2+, Cu2+ and Hg2+ with Sensors Based on Carbonaceous Nanomaterials and Fe3O4 Nanoparticles
by Ancuța Dinu (Iacob), Alexandra Virginia Bounegru, Catalina Iticescu, Lucian P. Georgescu and Constantin Apetrei
Nanomaterials 2024, 14(8), 702; https://doi.org/10.3390/nano14080702 - 18 Apr 2024
Viewed by 1017
Abstract
Two electrochemical sensors were developed in this study, with their preparations using two nanomaterials with remarkable properties, namely, carbon nanofibers (CNF) modified with Fe3O4 nanoparticles and multilayer carbon nanotubes (MWCNT) modified with Fe3O4 nanoparticles. The modified screen-printed [...] Read more.
Two electrochemical sensors were developed in this study, with their preparations using two nanomaterials with remarkable properties, namely, carbon nanofibers (CNF) modified with Fe3O4 nanoparticles and multilayer carbon nanotubes (MWCNT) modified with Fe3O4 nanoparticles. The modified screen-printed electrodes (SPE) were thus named SPE/Fe3O4-CNF and SPE/Fe3O4-MWCNT and were used for the simultaneous detection of heavy metals (Cd2+, Pb2+, Cu2+ and Hg2+). The sensors have been spectrometrically and electrochemically characterized. The limits of detection of the SPE/Fe3O4-CNF sensor were 0.0615 μM, 0.0154 μM, 0.0320 μM and 0.0148 μM for Cd2+, Pb2+, Cu2+ and Hg2+, respectively, and 0.2719 μM, 0.3187 μM, 1.0436 μM and 0.9076 μM in the case of the SPE/ Fe3O4-MWCNT sensor (following optimization of the working parameters). Due to the modifying material, the results showed superior performance for the SPE/Fe3O4-CNF sensor, with extended linearity ranges and detection limits in the nanomolar range, compared to those of the SPE/Fe3O4-MWCNT sensor. For the quantification of heavy metal ions Cd2+, Pb2+, Cu2+ and Hg2+ with the SPE/Fe3O4-CNF sensor from real samples, the standard addition method was used because the values obtained for the recovery tests were good. The analysis of surface water samples from the Danube River has shown that the obtained values are significantly lower than the maximum limits allowed according to the quality standards specified by the United States Environmental Protection Agency (USEPA) and those of the World Health Organization (WHO). This research provides a complementary method based on electrochemical sensors for in situ monitoring of surface water quality, representing a useful tool in environmental studies. Full article
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19 pages, 7872 KiB  
Article
Highly Sensitive Graphene-Based Electrochemical Sensor for Nitrite Assay in Waters
by Florina Pogăcean, Codruţa Varodi, Lidia Măgeruşan and Stela Pruneanu
Nanomaterials 2023, 13(9), 1468; https://doi.org/10.3390/nano13091468 - 25 Apr 2023
Cited by 10 | Viewed by 1368
Abstract
The importance of nitrite ions has long been recognized due to their extensive use in environmental chemistry and public health. The growing use of nitrogen fertilizers and additives containing nitrite in processed food items has increased exposure and, as a result, generated concerns [...] Read more.
The importance of nitrite ions has long been recognized due to their extensive use in environmental chemistry and public health. The growing use of nitrogen fertilizers and additives containing nitrite in processed food items has increased exposure and, as a result, generated concerns about potential harmful health consequences. This work presents the development of an electrochemical sensor based on graphene/glassy carbon electrode (EGr/GC) with applicability in trace level detection of nitrite in water samples. According to the structural characterization of the exfoliated material, it appears as a mixture of graphene oxide (GO; 21.53%), few-layers graphene (FLG; 73.25%) and multi-layers graphene (MLG; 5.22%) and exhibits remarkable enhanced sensing response towards nitrite compared to the bare electrode (three orders of magnitude higher). The EGr/GC sensor demonstrated a linear range between 3 × 10−7 and 10−3 M for square wave voltammetry (SWV) and between 3 × 10−7 and 4 × 10−4 M for amperometry (AMP), with a low limit of detection LOD (9.9 × 10−8 M). Excellent operational stability, repeatability and interference-capability were displayed by the modified electrode. Furthermore, the practical applicability of the sensor was tested in commercially available waters with excellent results. Full article
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