Plant-mediated gold and silver nanoparticles as detectors of heavy metal contamination

Nayak, Sneha; Goveas, Louella Concepta; Kumar, P. Senthil; Selvaraj, Raja; Vinayagam, Ramesh

doi:10.1016/j.fct.2022.113271

Cited by 26 publications

(4 citation statements)

References 112 publications

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“…AgNPs are usually synthesized using a chemical reduction from soluble silver(I) precursors (mostly AgNO 3 ), and many of these synthetic processes are carried out under harsh reaction conditions applying toxic hydrazine [ 45 ] or borohydride [ 113 , 163 , 166 ] reducing agents and/or (volatile) organic solvents [ 149 ]. Although there has been more recent focus towards green synthesis [ 31 , 38 , 189 ], in 64 of the 86 electrochemical sensors presented in this review the reduction of silver(I) to zero-valent form was assisted by electric current or inorganic reducing agents. It is important to emphasize that if the chemical reduction process using strong inorganic agents is precisely controlled, i.e., if no hazardous chemicals are released into the environment during the synthesis [ 44 ], such an approach does not necessarily contradict to the principles of green synthesis.…”

Section: Discussionmentioning

confidence: 99%

“…Atoms and molecules represent elementary building blocks for controlled bottom-up assembly into a nanostructured material. Therefore, this synthetic route is also referred to as the building-up approach [ 38 ]. Several bottom-up methods in solutions have the same denominator—a controlled reduction of Ag + ions from a silver precursor species to elemental silver.…”

Section: General Methods For the Synthesis Of Silver Nanoparticlesmentioning

confidence: 99%

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The Role of Silver Nanoparticles in Electrochemical Sensors for Aquatic Environmental Analysis

Ivanišević

2023

Sensors

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With rapidly increasing environmental pollution, there is an urgent need for the development of fast, low-cost, and effective sensing devices for the detection of various organic and inorganic substances. Silver nanoparticles (AgNPs) are well known for their superior optoelectronic and physicochemical properties, and have, therefore, attracted a great deal of interest in the sensor arena. The introduction of AgNPs onto the surface of two-dimensional (2D) structures, incorporation into conductive polymers, or within three-dimensional (3D) nanohybrid architectures is a common strategy to fabricate novel platforms with improved chemical and physical properties for analyte sensing. In the first section of this review, the main wet chemical reduction approaches for the successful synthesis of functional AgNPs for electrochemical sensing applications are discussed. Then, a brief section on the sensing principles of voltammetric and amperometric sensors is given. The current utilization of silver nanoparticles and silver-based composite nanomaterials for the fabrication of voltammetric and amperometric sensors as novel platforms for the detection of environmental pollutants in water matrices is summarized. Finally, the current challenges and future directions for the nanosilver-based electrochemical sensing of environmental pollutants are outlined.

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Section: Discussionmentioning

confidence: 99%

Section: General Methods For the Synthesis Of Silver Nanoparticlesmentioning

confidence: 99%

The Role of Silver Nanoparticles in Electrochemical Sensors for Aquatic Environmental Analysis

Ivanišević

2023

Sensors

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“…The ability of NPs to function as a biosensing element for metals has been investigated widely. Because of its high selectivity and sensitivity, the utilization of biogenic nanomaterials produced using straightforward techniques, such as green synthesis, for the detection of harmful heavy metal contamination is a viable strategy (Nayak et al, 2022). As a result of their ease of bioaccumulation and biomagnification in the food chain, heavy metals have been found to harm the health of all life forms (Uddandarao et al, 2019b).…”

Section: Crpnps Show Concentration-based Effects In Metal Biosensingmentioning

confidence: 99%

Novel carbon nanoparticles (CNPs) fromCatharanthus roseuspetals for metal ion sensing and root growth modulation

Omprabha,

Kaushal,

Gawande

et al. 2024

Preprint

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Nanoparticles are of major interest nowadays due to their distinctive properties. In this study, we present a microwave-assisted green synthesis of carbon nanoparticles from theCatharanthus roseuspetals. The nanoparticles exhibited a fluorescence emission in the 300 to 400 nm wavelength region and emitted a characteristic blue fluorescence. The extensive characterization using Bio-AFM showed that the size of nanoparticles was 25.38 nm. M-XRD and Zeta potential analysis confirmed that the nanoparticles were amorphous and exhibited a negative surface charge. The surface functional groups on the nanoparticles were highlighted by FTIR analysis. Metal sensing affinity of the synthesized CNPs and their effect on the plant growth was tested. These CNPs demonstrated the effective sequestration of metallic ions such as copper (Cu2+), iron (Fe2+), and nickel (Ni2+), indicating their potential to be used as biosensors in metal detection. It was found that the effect was proportionate to theCatharanthus roseuspetal nanoparticles (CRPNP) concentration, where it exhibits a great affinity for Fe2+.The effect of the nanoparticles analyzed on the root growth ofArabidopsis thalianashowed that CRPNP suppresses the primary root and lateral root numbers. These results demonstrate the use ofC. roseussynthesized CNPs in sustainable agriculture by targeting nutrient delivery.

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“…Metal oxide nanoparticle stability, controllability of size and shape, and prevention of aggregation are all strongly affected by phytochemicals. It is widely recognized that phytochemicals serve as reducing and capping agents during the green production of nanoparticles [27]. When creating nanoparticles, capping agents play an essential role as a dependable stabilizer to prevent excessive particle development.…”

Section: Introductionmentioning

confidence: 99%

Phytochemical Substances—Mediated Synthesis of Zinc Oxide Nanoparticles (ZnO NPS)

Alharbi,

Abaker,

Makawi

2023

Inorganics

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Artemisia absinthium (A. absinthium) leaf extract was successfully used to create zinc oxide nanoparticles (ZnO NPs), and their properties were investigated via several techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), Fourier transform infrared (FTIR), and ultraviolet–visible spectroscopy (UV–Vis spectroscopy). SEM analysis confirmed the spherical and elliptical shapes of the particles. Three different zinc peaks were observed via EDX at the energies of 1, 8.7, and 9.8 keV, together with a single oxygen peak at 0.5 keV. The XRD analysis identified ZnO NPs as having a hexagonal wurtzite structure, with a particle size that decreased from 24.39 to 18.77 nm, and with an increasing surface area (BET) from 4.003 to 6.032 m2/g for the ZnO (without extract) and green ZnO NPs, respectively. The FTIR analysis confirmed the groups of molecules that were accountable for the stabilization and minimization of the ZnO NPs, which were apparent at 3400 cm. Using UV–Vis spectroscopy, the band-gap energies (Egs) for the green ZnO and ZnO (without extract) NPs were estimated, and the values were 2.65 and 2.79 eV, respectively.

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Plant-mediated gold and silver nanoparticles as detectors of heavy metal contamination

Cited by 26 publications

References 112 publications

The Role of Silver Nanoparticles in Electrochemical Sensors for Aquatic Environmental Analysis

The Role of Silver Nanoparticles in Electrochemical Sensors for Aquatic Environmental Analysis

Novel carbon nanoparticles (CNPs) fromCatharanthus roseuspetals for metal ion sensing and root growth modulation

Phytochemical Substances—Mediated Synthesis of Zinc Oxide Nanoparticles (ZnO NPS)

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