In situ green synthesis of highly fluorescent Fe₂O₃@CQD/graphene oxide using hard pistachio shells via the hydrothermal‐assisted ball milling method

Abstract

In this study, highly photoluminescent and photocatalytic Fe2O3@carbon quantum dots/graphene oxide nanostructures were synthesized using ball milling‐assisted hydrothermal synthesis with hard pistachio shells. Different analyses, such as X‐ray diffraction, energy dispersive X‐ray spectroscopy, and Fourier transform infrared spectroscopy were used to study the product structure. Scanning electron microscopy and transmission electron microscopy images were used to study product size and morphology. Optical properties of the as‐synthesized nanomaterials were investigated using ultraviolet–visible light and photoluminescence analyses. To increase photoluminescence intensity, ethylene diamine tetraacetic acid, polyethylene glycol, polyvinylpyrrolidone, and acetylacetonate anions were used to modify the product surface. Thermal stability of the product was studied using thermal gravimetric analysis. Finally, photocatalytic activity and surface adsorption of the product were investigated; the produce was found to be highly photoluminescent with high photocatalytic and surface activities.

Tagetes erecta as an organic precursor: synthesis of highly fluorescent CQDs for the micromolar tracing of ferric ions in human blood serum

“…Furthermore, the peak at ∼23° may be due to the presence of an oxygen-containing functional group and is in accord with other research studies. 31 …”

“…S3 †) has also been carried out, as an indicator to optimize the synthesis criteria for TE-CQDs. The FT-IR spectra of TE-CQDs and its precursor exhibits absorption band at $3322 cm À1 , 2930 cm À1 , 2849 cm À1 , 1734 cm À1 , 1707 cm À1 , 1567 cm À1 , 1015 cm À1 , and 831 cm À1 ascribes to O- 31,39,58 respectively. The presence of symmetric and asymmetric stretching of CH 2 reveals that the carbon quantum dots primarily consist of hydrocarbons.…”

“…Furthermore, the peak at $23 may be due to the presence of an oxygen-containing functional group and is in accord with other research studies. 31 XPS measurement has been carried out to elaborate the surface chemical compositions of the as-synthesized TE-CQDs sample. Fig.…”

“…4,28,29 Beyond troubling ambiguity with the selection of appropriate synthesis route, a true and big issue has been the preference of environment friendly and cost-effective precursor also. To nd a way around, diverse precursors including green/biowaste/ sustainable sources such as banana juice, coffee grounds, cellulose, 3,30 Catharanthus roseus, 7 pistachio shells, 31 waste paper, 32 ethylenediamine, 33 rice husk, 34 watermelon juice, 35 gelatine, 36 bamboo, 37 etc. have been used as rich carbon source replacing hazardous chemicals.…”

Effect of Synthesis Process, Synthesis Temperature, and Reaction Time on Chemical, Morphological, and Quantum Properties of Carbon Dots Derived from Loblolly Pine

“…Figure 2 shows the TEM image of CDBU and CDTD at 180 ℃ and 3 h. The nearly spherical form of the produced CDs, as seen by TEM observation, could be explained by the presence of CD structures [55]. They are uniformly scattered and typically have diameters between 2 and 10 nm.…”