Cucurbit[6]uril Glued Magnetic Clay Hybrid as a Catalyst for Nitrophenol Reduction

Trivedi, Maitrayee U.; P, chandra kanth; Misra, Nirendra M.; Pandey, Manoj Kumar

doi:10.1007/s10562-019-02853-0

Cited by 15 publications

(7 citation statements)

References 46 publications

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“…Therefore, the introduction of suitable nanocatalysts is vital in realizing the degradation of 4-NP. In the reaction system, BH 4 − ions generated by the ionization of NaBH 4 act as electron donors and hydrogen suppliers [44][45][46] Cu + in the presence of BH4 − anion. The changes of valence state between Cu + -Cu 2+ and Fe 2+ -Fe 3+ ion pairs in CuFe2O4 can enhance catalytic activity, which is the distinct advantage over CoFe2O4 and NiFe2O4 [48].…”

Section: Resultsmentioning

confidence: 99%

Recyclable Magnetic Cu/CuFe2O4 Nanocomposites for the Rapid Degradation of 4-NP

et al. 2020

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Magnetic Cu/CuFe2O4 nanocomposites were prepared by the one-pot thermal decomposition of acetylacetone compounds. Adjusting the molar ratios of Fe to Cu was used to control the content of Cu in the synthetic process. XRD, TEM, XPS and UV-Vis were employed to reveal detailed structural and catalytic activities of Cu/CuFe2O4 nanocomposites. Magnetic measurements demonstrated that Cu/CuFe2O4 nanocomposites possessed a considerable magnetic saturation. Cu/CuFe2O4 nanocomposites showed superb efficiency in the degradation of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). 4-NP could be reduced by Cu/CuFe2O4 nanocomposites within 40 s in the attendance of NaBH4. Cu nanocrystals played an indispensable rose in the enhancement of catalytic performance. The synergistic effect of Cu and CuFe2O4 nanocrystals achieved the high-efficiency catalytic reduction for 4-NP. After six recycling experiments, the efficiency of Cu/CuFe2O4 nanocomposites was almost stable. Our work advances a straightforward strategy to synthesize efficient and recoverable Cu/CuFe2O4 nanocomposites, which has promising utilizations in the purifying of nitrophenolic contamination.

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Section: Resultsmentioning

confidence: 99%

Recyclable Magnetic Cu/CuFe2O4 Nanocomposites for the Rapid Degradation of 4-NP

et al. 2020

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“…prepared iridium‐doped electrocatalysts by utilizing cucurbit[6]uril as the carbon source precursor, which exhibited a high Faradaic efficiency and superior turnover frequency [31] . In addition to the high thermal stability, Q[6] also exhibits excellent stability in strongly acidic or basic media [32] . Recently, a cucurbit[6]uril‐supported silicotungstic acid (Q[6]‐STA) catalyst was used for the esterification of butylparaben (BP) and propyl gallate (PG).…”

Section: Introductionmentioning

confidence: 99%

“…[31] In addition to the high thermal stability, Q [6] also exhibits excellent stability in strongly acidic or basic media. [32] Recently, a cucurbit [6]uril-supported silicotungstic acid (Q [6]-STA) catalyst was used for the esterification of butylparaben (BP) and propyl gallate (PG). The catalyst enhanced the stability of STA and improved its catalytic efficiency.…”

Section: Introductionmentioning

confidence: 99%

Production of Ethyl Levulinate from Biomass‐Derived Carbohydrates and Food/Kitchen Waste Catalyzed by Cucurbit[6]uril‐Sulfate

Zhang

Zhao

et al. 2022

ChemistrySelect

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The research on production of fuels and value‐added chemicals from sustainable feedstocks is of considerable significance. In this study, a solid acid, cucurbit[6]uril‐sulfate (Q[6]‐sulfate) was prepared as an efficient catalyst to produce ethyl levulinate (EL) from various feedstocks, including biomass‐derived carbohydrates (fructose, glucose, and sucrose), expired fructan‐probiotic granules and kitchen waste. Compared to homogeneous mineral/organic acids, the application of solid acid Q[6]‐sulfate reduced the acidic waste effluent and alleviated the corrosion of equipment. Q[6]‐sulfate exhibited higher catalytic efficiency than conventional sulfonic solid acids. After optimizing reaction conditions, EL yields of 97.3 %, 97.1 %, and 76.3 % were obtained from fructose, glucose, and sucrose, respectively. Furthermore, EL was successfully produced by the Q[6]‐sulfate‐catalyzed ethanolysis of expired fructan‐probiotic granules and kitchen waste, and maximum yields of 89.5 % and 43.7 % were obtained respectively. This work provides a sustainable route for the catalytic production of EL and the valorization of biomass‐derived carbohydrates and food/kitchen waste.

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“…The inner cavity of CB[ n ] is hydrophobic and accessible through two identical carbonyl portals to form inclusive complexes with the cationic guests. CB[ n ]s are also unique candidates for nanoparticle-capping, where they bind over the nanoparticle surface and also provide an available cavity for guest binding. − The complexation of CB[ n ] with azo dyes, textile dyes, and reactive dyes , was studied by Buschmann and Karcher to understand the binding mechanism and its probable application in wastewater treatment. Among homologues of CB[ n ], CB[6] is a suitable adsorbent for wastewater treatment due to its better thermal stability, good binding nature, and poor solubility in water .…”

Section: Introductionmentioning

confidence: 99%

Cucurbituril-Functionalized Nanocomposite as a Promising Industrial Adsorbent for Rapid Cationic Dye Removal

Trivedi

Patel

et al. 2021

ACS Omega

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A supramolecular cucurbit[6]uril (CB[6])-enriched magnetic montmorillonite (CBCM) nanocomposite was prepared and characterized. CB[6] played a prominent role as a capping agent, helping in better distribution of the nanoparticles, and as a binder between nanoparticles. Montmorillonite provided structural stability and fortified ultrafast adsorption toward dyes. Its application in the removal of cationic dyes from wastewater was systematically assessed. Process parameters such as pH, initial dye concentration, dosage, temperature, and time were optimized. Kinetics and isotherms of the process were described using pseudo-second-order kinetics and the Langmuir isotherm, respectively. CBCM exhibited rapid dye removal capacity in short reaction times with q max of 199.20, 78.31, and 55.62 mg g–1 and K2 of 0.0281, 0.0.0823, and 0.0953 L mg–1 min–1 for crystal violet, methylene blue, and rhodamine B, respectively. Benefiting from the synergetic effects of montmorillonite surface hydrophobicity, abundant carbonyl groups of CB[6], and magnetic properties of copper ferrite, CBCM demonstrated outstanding dye removal capacity, negligible leaching at saturation, and high tolerance toward harsh conditions. This intrinsic nature is expedient in prolonged industrial operations. To demonstrate industrial viability, syringe filtration and continuous flow fixed-bed column operations were validated. The CBCM fixed-bed column demonstrated stable dye removal efficiency with 10–100 mg mL–1 dye at 10–50 mL min–1 flow rates. Utilizing the magnetic and catalytic activities of the copper ferrite nanoparticles, CBCM was recycled using a magnet, regenerated, and reused for several cycles. CB[6] remarkably improved the performance of the nanocomposite and made it suitable for different effluent treatment techniques. This may pave a sustainable way toward the efficient onsite treatment of effluent at the industrial scale.

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Cucurbit[6]uril Glued Magnetic Clay Hybrid as a Catalyst for Nitrophenol Reduction

Cited by 15 publications

References 46 publications

Recyclable Magnetic Cu/CuFe2O4 Nanocomposites for the Rapid Degradation of 4-NP

Recyclable Magnetic Cu/CuFe2O4 Nanocomposites for the Rapid Degradation of 4-NP

Production of Ethyl Levulinate from Biomass‐Derived Carbohydrates and Food/Kitchen Waste Catalyzed by Cucurbit[6]uril‐Sulfate

Cucurbituril-Functionalized Nanocomposite as a Promising Industrial Adsorbent for Rapid Cationic Dye Removal

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