Catalytic degradation of hazardous textile dyes by iron oxide nanoparticles prepared from Raphanus sativus leaves’ extract: a greener approach

Balu, Periyasamy; Asharani, Indira Viswambaran; Thirumalai, Dhakshanamurthy

doi:10.1007/s10854-020-03616-z

Cited by 38 publications

(12 citation statements)

References 33 publications

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“…The band for the OH group of MR is present at 3,307 cm −1 , but in SS s it is displaced to 3,055 cm −1 . In the same way, the carboxylic acid band of MR appears at 1,725 cm −1 , [13] but within MR⋅⋅⋅OA it appears as a carboxylate band at 1,599 cm −1 . Also, in the MR⋅⋅⋅OA⋅⋅⋅ ( PhOH ) i products, the OH band is displaced from 3,043 to 3,049 cm −1 and the CO band from 1,223 to 1,230–1,233 cm −1 .…”

Section: Resultsmentioning

confidence: 68%

“…The 13 C NMR spectra of the supramolecular assemblies show a similar behavior as the signals for the phenol molecule appear displaced (Table 2); for example, the signal of C ipso appears originally at 155.38 ppm, but in the supramolecular complex it shifted to a lower field (higher ppm) due to a lower electron density from the straight inductive effect of the O atom at PhOH. The latter occurs because the lone-electron pairs are involved in the interactions leading to hydrogen bonds of the supramolecular assembly.…”

Section: Molecule or Complex Total Electronic Energymentioning

confidence: 73%

“…Also, displacements on the aromatic 13 C-NMR signals were observed: C4 is slightly displaced at a low field, whereas, in comparison, C2 is protected due to the formation of the supramolecular assembly. On the other hand, C5 and C6 are displaced at higher fields, according to the 1 H-NMR spectra; therefore, positions 2, 5, and 6 experience a strong π retrodonation from the COO À moiety because they belong to the same aromatic ring where the supramolecular interaction is occurring, i. e., are closer to the position where the chemical effect is happening.…”

Section: Synthesis and Characterizationmentioning

confidence: 96%

“…Complementarily, in the 13 C-NMR spectra, a displacement of the carbonyl signal to a higher frequency is observed due to the high electronegativity of the two oxygen atoms of the formed anionic head that deprotects the carbon nuclei (see Figure 2 in SI), i. e., the 13 C-NMR signal of MR's carboxylic C1 appears at 167.35 ppm, whereas, in the MR•••OA product, it is displaced at a low field of 174.70 ppm.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

“…Likewise, the displacements in the 1 H and 13 C NMR spectroscopies of the supramolecular surfactants MR•••OA•••(PhOH) i can be taken as evidence of the formation of supramolecular interactions. [10,11] The 1 H NMR signals for the free PhOH molecule appear as a triplet at 7.22 ppm, a triplet at 6.92 ppm, and a doublet at 6.83 ppm (see Figure 3 in SI).…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

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Quantum Design and Synthesis of a Gasoline Marker Based on a Phenol‐Functionalized Supramolecular Quaternary‐Salt Complex

Soto‐Castruita,

Cisneros‐Dévora,

Cerón‐Camacho

et al. 2023

ChemistrySelect

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We present the development of supramolecular surfactants (SSs) based on MR⋅⋅⋅OA⋅⋅⋅(PhOH)i complexes among methylene red (MR), oleyl amine (OA) and stoichiometric amounts of phenol (PhOH), aimed at obtaining markers for the identification of gasolines by harnessing their supramolecular interactions‐mediated stability and homogeneous distribution within gasoline, as well as their very‐characteristic nuclear magnetic resonance (NMR), Fourier‐transform infrared (FTIR), and UV‐visible (UV‐vis) signals. Density functional theory (DFT), together with the conductor‐like screening model (COSMO), reveal that the supramolecular interactions are due to a non‐ionic to ionic reaction under which the carboxylic proton is transferred from MR to OA, and that PhOH confers solubility to SSs withing gasoline by hiding their ionic heads. The proton transference was confirmed by 1H NMR and 13C NMR, FTIR, and thermogravimetric analysis spectroscopies, whereas the solubility in gasoline through UV‐vis absorbance measurements that, together with viscosity measurements, also revealed that the maximum content of PhOH for adequate performance is 3, in agreement with DFT‐COSMO calculations, which predict that for 3 the SSs’ interaction energy per additional PhOH becomes weaker. All theoretical and experimental results support the viability of MR⋅⋅⋅OA⋅⋅⋅(PhOH)i complexes as gasoline markers due to their full compatibility with gasoline and their well‐defined spectroscopic‐fingerprints.

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Section: Resultsmentioning

confidence: 68%

Section: Molecule or Complex Total Electronic Energymentioning

confidence: 73%

Section: Synthesis and Characterizationmentioning

confidence: 96%

Section: Synthesis and Characterizationmentioning

confidence: 99%

Section: Synthesis and Characterizationmentioning

confidence: 99%

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Quantum Design and Synthesis of a Gasoline Marker Based on a Phenol‐Functionalized Supramolecular Quaternary‐Salt Complex

Soto‐Castruita,

Cisneros‐Dévora,

Cerón‐Camacho

et al. 2023

ChemistrySelect

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Effect of extraction methods on phytochemical constituents and antioxidant activity of de‐kernelled Sclerocarya birrea seeds

et al. 2023

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BACKGROUNDMarula (Sclerocarya birrea) is an indigenous African fruit‐bearing tree with many commercial uses; however, de‐kernelled seeds generated from marula fruit‐processing are wasted. The phytochemical constituents of de‐kernelled marula seeds have not been investigated previously and its extract/tea may potentially serve as a promising source of antioxidants and phytochemicals. This study aimed to investigate the effect of different extraction methods (maceration and decoction) on the recovery of phenolic compounds, sugars, organic acids, and antioxidants from de‐kernelled marula seeds.RESULTSExtracts produced from decoction for 30 min contained the highest phenolic content (2253.93 ± 25.72 mg gallic acid equivalent kg‐1 extract), flavonoid content (1020.99 ± 23.90 mg rutin equivalent kg‐1 extract), as well as combined sugars and organic acids (1884.03 mg kg‐1 extract). Fourier‐transform infrared spectroscopy analysis confirmed the presence of functional groups typically present in phenolic compounds, sugars, and organic acids in the extracts obtained from decoction.CONCLUSIONThe characterization revealed that decoction extraction increased solubility, variety, and yield of phytochemical and antioxidant compounds recovered from de‐kernelled marula seeds. The highest concentrations of phytochemicals were obtained using the decoction method. This study may therefore pave the way for extract composition and future utilization of de‐kernelled marula seeds in the food industry. © 2023 Society of Chemical Industry.

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Metal Oxide-Based Nanomaterials for the Treatment of Industrial Dyes and Colorants

Vadiraj

Shivaraju

2022

Sustainable Textiles: Production, Processing, Manufacturing &Amp; Chemistry

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Catalytic degradation of hazardous textile dyes by iron oxide nanoparticles prepared from Raphanus sativus leaves’ extract: a greener approach

Cited by 38 publications

References 33 publications

Quantum Design and Synthesis of a Gasoline Marker Based on a Phenol‐Functionalized Supramolecular Quaternary‐Salt Complex

Quantum Design and Synthesis of a Gasoline Marker Based on a Phenol‐Functionalized Supramolecular Quaternary‐Salt Complex

Effect of extraction methods on phytochemical constituents and antioxidant activity of de‐kernelled Sclerocarya birrea seeds

Metal Oxide-Based Nanomaterials for the Treatment of Industrial Dyes and Colorants

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