A microwave-based technique as a feasible method to detect plastic pollutants in experimental samples

VishnuRadhan, Renjith; Lonappan, Anil; Eldho, T. I.

doi:10.1016/j.jhazmat.2022.128224

Cited by 8 publications

(2 citation statements)

References 60 publications

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“…The polystyrene NPs detected in this paper are nonpolar plastics with high resistivity and low dielectric constants, most of which are stabilized in DI water as nonconductive particles, and a few particles are ionized due to the groups they carry. 43 As shown in Figure 6, the amino group of PS-NH 2 appears mainly in the form of ions in the solution, and −NH 2 will be strongly hydrolyzed in water to produce structurally stable PS-NH 3 + and OH − , finally achieving a stable ionization equilibrium, and the charged property of such NPs will enhance their microwave response. PS-SO 3 H is more stable than PS-NH 2 due to the strong electrostatic repulsion between particles, 33 and is also an organic compound containing a sulfonic acid group that can weakly ionize in solution.…”

Section: Design and Analysis Of Ipd-based Microwave Sensing Chipmentioning

confidence: 99%

Integrated Passive Sensing Chip for Highly Sensitive and Reusable Detection of Differential-Charged Nanoplastics Concentration

Wang,

Fu,

et al. 2023

ACS Sens.

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In this work, a new type, highly sensitive, and reusable nanoplastics (NPs) microwave detection method is proposed, which can be used to rapidly analyze NPs with different surface charges and sizes. The effective dielectric constant of NPs varies according to the different concentrations, particle sizes, and surface charges of NPs in aqueous solution. The feasibility of the microwave method for differential-charged NPs detection is verified using a complementary split ring resonator sensor manufactured on a cost-effective printed circuit board, which shows a high sensitivity only for positively charged NPs (PS-NH2) detection. To achieve microwave detection of both positively and negatively charged NPs (PS-SO3H), a microscale spiral-coupled resonator sensing chip is manufactured through integrated passive technology, which demonstrates extremely low detection limits and high sensitivity for both PS-NH2 and PS-SO3H, with different concentrations, particle sizes, and charges. In addition, for NPs solution doped with methyl orange, the device can still perform stable measurements, overcoming the inability of traditional NPs molecular element determination and optical detection methods to detect NPs aqueous solution with organic matter doping and color presence. The proposed microwave detection method could also be extended to sensing detection for detecting other hazardous environmental substances.

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Section: Design and Analysis Of Ipd-based Microwave Sensing Chipmentioning

confidence: 99%

Integrated Passive Sensing Chip for Highly Sensitive and Reusable Detection of Differential-Charged Nanoplastics Concentration

Wang,

Fu,

et al. 2023

ACS Sens.

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“…Recently, there has been a large number of scientific reviews promising to elucidate not only the effects of MNP pollution on risks to human health [ 49 ] and the environment [ 50 ], but also many methodologies for the trace detection of MNPs in aquatic [ 51 , 52 ], sedimentary [ 53 , 54 ], freshwater, and coastal ecosystems [ 55 ], as well as other environments [ 56 , 57 ], in wastewater [ 58 ], and on beaches [ 59 ]. Furthermore, several researchers have investigated a variety of analytical technologies for the trace detection of MNPs, including fluorescence microscopy [ 18 , 60 – 62 ], impedance spectroscopy [ 63 ], microwave-based techniques [ 64 ], hyperspectral imaging [ 65 , 66 ], Fourier transform infrared spectroscopy (FTIR) [ 67 , 68 ], near-infrared (NIR) hyperspectral imaging and chemometrics [ 69 ], semi-automated analysis [ 70 ], a thermo analytical method [ 71 ], and mass- or particle-based analysis [ 72 ]. However, these thermal analysis methodologies often require additional procedures to separate analytes in the sample preparation, leading to time-consuming and toxic organic solvents, as well as further adverse effects on the environment.…”

Section: Introductionmentioning

confidence: 99%

Advanced microplastic monitoring using Raman spectroscopy with a combination of nanostructure-based substrates

Kim

Lee

et al. 2022

J Nanostruct Chem

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Micro(nano)plastic (MNP) pollutants have not only impacted human health directly, but are also associated with numerous chemical contaminants that increase toxicity in the natural environment. Most recent research about increasing plastic pollutants in natural environments have focused on the toxic effects of MNPs in water, the atmosphere, and soil. The methodologies of MNP identification have been extensively developed for actual applications, but they still require further study, including on-site detection. This review article provides a comprehensive update on the facile detection of MNPs by Raman spectroscopy, which aims at early diagnosis of potential risks and human health impacts. In particular, Raman imaging and nanostructure-enhanced Raman scattering have emerged as effective analytical technologies for identifying MNPs in an environment. Here, the authors give an update on the latest advances in plasmonic nanostructured materials-assisted SERS substrates utilized for the detection of MNP particles present in environmental samples. Moreover, this work describes different plasmonic materials—including pure noble metal nanostructured materials and hybrid nanomaterials—that have been used to fabricate and develop SERS platforms to obtain the identifying MNP particles at low concentrations. Plasmonic nanostructure-enhanced materials consisting of pure noble metals and hybrid nanomaterials can significantly enhance the surface-enhanced Raman scattering (SERS) spectra signals of pollutant analytes due to their localized hot spots. This concise topical review also provides updates on recent developments and trends in MNP detection by means of SERS using a variety of unique materials, along with three-dimensional (3D) SERS substrates, nanopipettes, and microfluidic chips. A novel material-assisted spectral Raman technique and its effective application are also introduced for selective monitoring and trace detection of MNPs in indoor and outdoor environments. Graphical abstract

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Overview of Microwave NDT Techniques for Fibre-Reinforced Polymer Composites

Li,

Soutis,

Gibson

2024

Appl Compos Mater

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A microwave-based technique as a feasible method to detect plastic pollutants in experimental samples

Cited by 8 publications

References 60 publications

Integrated Passive Sensing Chip for Highly Sensitive and Reusable Detection of Differential-Charged Nanoplastics Concentration

Integrated Passive Sensing Chip for Highly Sensitive and Reusable Detection of Differential-Charged Nanoplastics Concentration

Advanced microplastic monitoring using Raman spectroscopy with a combination of nanostructure-based substrates

Overview of Microwave NDT Techniques for Fibre-Reinforced Polymer Composites

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