Green synthesis of carbon nanodots from agro-industrial residues

Afonso, Allan Jr. Gonçalves; Aquino, Felipe Thomaz; Dalmônico, Gisele M. L.; Nascimento, Matheus Vieira; Wrasse, Ernesto Osvaldo; Aguiar, Kelen Menezes Flores Rossi de

doi:10.1007/s42823-021-00260-3

Cited by 9 publications

(3 citation statements)

References 56 publications

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“…[37] Furthermore, many hydrophilic groups, such as carboxyl, hydroxyl, and amino groups, enable the CDs to be more biocompatible and highly dispersed in aqueous media. [38] Recently, Afonso et al [39] (2022) prepared carbon nanodots (CNDs) using perennial ryegrass as a carbon source, which contained carbonyl, hydroxyl, sulfur, and oxygen functional groups, without any chemical modifications. The CDs derived from natural compounds exhibit enhanced luminescence.…”

Section: Fourier Transform Infrared (Ft-ir) Characterization Of W-cqd...mentioning

confidence: 99%

Commercial Wheat and Oat Flour Derived Fluorescent Carbon Quantum Dots through Sustainable Hydrothermal Synthesis and Their Biological Activities

Kuppusamy,

Kim,

Park

et al. 2024

ChemistrySelect

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In this study, we utilized processed edible commercial wheat and oat flours to synthesize highly fluorescent carbon dots using green hydrothermal synthesis. The as‐synthesized carbon quantum dots (CQDs) were characterized using UV‐vis spectrophotometry, photoluminescence spectrophotometry, high‐resolution transmission electron microscopy, and Fourier transform infrared spectroscopy. The synthesized wheat‐CQDs (W‐CQDs) and oat‐CQDs (O‐CQDs) had monodispersed spherical shapes with average sizes of 3–8 and 5–10 nm, respectively, and exhibited strong fluorescence intensity and excitation‐dependent photoluminescence. The W‐CQDs and O‐CQDs were highly dispersed in aqueous solutions and exhibited bright green and blue fluorescence, respectively, under UV light (λex=380 and 370 nm). Both CQDs contained abundant functional groups, including amino, hydroxyl, and carboxyl groups, which may play a major role in biological applications. The W‐CQDs and O‐CQDs showed good free‐radical scavenging capacity in the 2,2‐diphenylpicrylhydrazyl (DPPH) and H2O2 assays. The anti‐inflammatory activities of W‐CQDs and O‐CQDs were more effective than that of the standard, with EC50 values of 1.8 and 1.3 mg/mL, respectively, in the protein denaturation assay. Additionally, the CQDs exhibited low cytotoxicity toward NIH3T3 fibroblast and human HeLa cervical cancer cells when treated with a 5‐mg/mL concentration. Therefore, green‐synthesized W‐CQDs and O‐CQDs are easily available, less cytotoxic, and applicable to therapeutic and cell nanocarrier purposes.

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Section: Fourier Transform Infrared (Ft-ir) Characterization Of W-cqd...mentioning

confidence: 99%

Commercial Wheat and Oat Flour Derived Fluorescent Carbon Quantum Dots through Sustainable Hydrothermal Synthesis and Their Biological Activities

Kuppusamy,

Kim,

Park

et al. 2024

ChemistrySelect

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“…The first-ever chitosan capped gold nanoparticles act as a Hg (II) sensor [71] when tested on agricultural soil which works on plug and play mode and is found to be compliant with the "gold standard." Similarly, ryegrass, which aids the one-step synthesis of carbon dots [72], was found to be useful for chelating heavy metals. Regarding chitosan-based nanocomposites, its association with the surface plasmon resonance phenomenon makes it popular in building a detector for glyphosate [73] and is considered a prominent herbicide highly polar and water-soluble.…”

Section: Soil Quality and Water Retentionmentioning

confidence: 99%

Bioinspired Advances in Nanomaterials for Sustainable Agriculture

Malini¹,

Raj²,

Madhumathy

et al. 2022

Journal of Nanomaterials

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Rising demand for food production and an intensified usage of hazardous substances on the farmland are the driving force behind the emergence of green nanotechnology. Eco-friendly nanomaterials synthesised using plant sources and microorganisms are expected to catalyse a revolution in the agricultural sector by introducing nano-enabled smart sensors for metals along with organic toxins, supplying micronutrients; balancing the plant hormones, soil quality, and moisture content; stimulating plant growth; and minimising the usage of toxic chemicals by nanofertilizers and nanopesticides. As no single nanocompound has proved to be completely sustainable, this review discusses a wide variety of sustainable routes to implement nanomaterials to increase productivity, protect, and monitor crops through innovative nano-aided agricultural practices. Nevertheless, as the progress of research and commercialization in this area is still marginal, an understanding of complex dynamic behaviour, careful evaluation with targeted delivery of these compounds in the environment, and strong governmental regulatory norms are necessary to realize the effectiveness of green nanotechnology for sustainable agriculture. This article outlines some major advancements in recent years related to the implementation of eco-friendly nanomaterials in the agricultural sector. A systematic and comprehensive approach to adopting green nanotechnology would certainly promote a sustainable movement resulting in a beneficial economic and ecological impact.

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“…25 Unclear mechanism of nanoparticle formation from molecular precursors stimulates speculative research on the synthesis of poorly characterized carbon nanodots (CNDs) from almost any organic compound. [26][27][28][29][30][31][32] Commonly CNDs have small (1-5 nm) particle size and spherical topology, and no obvious graphene nature of the core. 26,33 Contrary, chemistry of the nanoparticles synthesized from carbon macro objects is much clear.…”

Section: Introductionmentioning

confidence: 99%