Mesoporous halloysite nanotubes modified by CuFe2O4 spinel ferrite nanoparticles and study of its application as a novel and efficient heterogeneous catalyst in the synthesis of pyrazolopyridine derivatives

Maleki, Ali; Hajizadeh, Zoleikha; Salehi, Peyman

doi:10.1038/s41598-019-42126-9

Cited by 105 publications

(62 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4). All the four ferrites showed a similar hysteresis loop at a high relative pressure fit for type IV of adsorption isotherm corresponding to the mesoporous materials 18 . The hysteresis loop at a high relative pressure (P/P 0 ) in the range of 0.5-1.0 showed that the mesopores are irregular in the photocatalyst which was further confirmed by the Barrett, Joyner, and Halenda pore size distribution (inset images in Supplementary Fig.…”

Section: Resultsmentioning

confidence: 78%

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Gupta

Ghaffari

Kim

et al. 2020

Sci Rep

159

View full text Add to dashboard Cite

in this study, we report a surfactant-mediated synthesis of ferrites (Mfe 2 o 4 : M = co, ni, cu, Zn) using the co-precipitation-oxidation method. The band gap calculated from UV-Visible diffuse reflectance spectra were found in the range of 1.11-1.81 eV. These ferrite nanocatalysts were studied for the photocatalytic degradation of multiple organic dyes in a 32 W UV-C/H 2 o 2 system. All the four ferrites showed an excellent dye degradation rate in the range of 2.065-2.417 min −1 at neutral pH. in the optimized condition, NiF was found to degrade 89%, 92%, 93%, and 78% of methylene blue, methyl orange, bromo green, and methyl red, respectively within 1 min of UV-irradiation. A 40% TOC removal was recorded after 5 min of degradation reaction, which increased to 60% after 50 min. Mechanism elucidated by scavenger studies and fluorescence spectroscopy revealed that • oH and holes were the primary reactive radicals responsible for the degradation process. ferrite photocatalysts showed an insignificant performance loss in seven consecutive cycles. The photocatalyst was found efficient in the presence of a high concentration of salts. thus, it was concluded that these photocatalysts are highly suitable for the remediation of dye-contaminated wastewater. The ever-increasing population, coupled with rapid urbanization and industrialization, have deteriorated the quality of life. Excessive contamination of water bodies could be a severe threat to both human beings and other life forms. Organic dyes are considered as one of the major pollutants discharged into the environment by textile, printing, food, and leather industries 1. Though a large segment of these synthetic dyes is non-toxic or less toxic, their presence in water increases the oxygen demand, which in turn affects aquatic animals 2. Among the dyes consumed in industries, up to 70% belong to azo dye family (those with azo-functional group "-N = N-"). Azo dyes have genotoxic, mutagenic, and carcinogenic effects on living beings 3. Some of the azo dyes are known to be carcinogenic in the non-cleaved state, and for many of the azo dyes, their cleaved products such as benzidine are known to induce tumors 4. Conventional biological, chemical, and physical methods like adsorption 5,6 , chemical precipitation 7 , and microbial degradation 8 have been established for the remediation of dye-contaminated wastewater. The practical application of these processes suffers due to high operational cost, sludge production, or formation of secondary pollutants. For a complete or partial degradation of organic dyes (into non-toxic byproducts), degradation by adopting the photocatalytic process is one of the viable options. In recent years, advanced oxidation processes based on the generation of highly reactive hydroxyl radicals have gained momentum for the degradation of toxic organic pollutants 9. Though the Fenton process is easier to operate, it suffers badly due to a slow regeneration of Fe 2+ ions 10. Thus, the ultraviolet radiation or electrochemical method is generally cou...

show abstract

Section: Resultsmentioning

confidence: 78%

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Gupta

Ghaffari

Kim

et al. 2020

Sci Rep

159

View full text Add to dashboard Cite

show abstract

“…In recent years, the modication of HNTs by magnetic nanoparticles has been frequently reported in the scientic literature. [8][9][10] The modied nanocomposites have been utilized in some areas such as reduction of nitrophenol, dyes removal. 11,12 The metals-containing nanocatalysts with their applicable properties have been mostly employed to assist diverse chemical reactions, such as oxidation and reduction reactions, coupling, cross-coupling, multicomponent reactions, click and cycloaddition reactions under the convenient and benign procedure.…”

Section: Introductionmentioning

confidence: 99%

Cu(ii) immobilized on Fe₃O₄@HNTs–tetrazole (CFHT) nanocomposite: synthesis, characterization, investigation of its catalytic role for the 1,3 dipolar cycloaddition reaction, and antibacterial activity

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…As a result, a reusable, eco‐friendly and efficient Lewis acid catalyst has been successfully used for one‐pot synthesis of imidazole derivatives. In addition, the simplicity of the preparation and performance of the present nanocatalyst make this protocol as an effective and attractive approach for the future works and large scale industrial production …”

Section: Characterization Of the Zns‐znfe2o4 Hybrid Nanocatalystmentioning

confidence: 99%

Design and preparation of ZnS‐ZnFe₂O₄: a green and efficient hybrid nanocatalyst for the multicomponent synthesis of 2,4,5‐triaryl‐1H‐imidazoles

Varzi

Maleki

2019

Applied Organom Chemis

Self Cite

View full text Add to dashboard Cite

In the present work, a new protocol was introduced for the preparation of an efficient hybrid nanocatalyst ZnS-ZnFe 2 O 4 via the co-precipitation method as well as its application in the synthesis of 2,4,5-triaryl-1H-imidazoles derivatives starting from various aromatic aldehydes, benzil and ammonium acetate under ultrasonic irradiation in ethanol. ZnS-ZnFe 2 O 4 was characterized by Fourier transform infrared (FT-IR) spectroscopy, energy-dispersive X-ray spectroscopy (EDS) analysis, scanning electron microscopy (SEM) image, X-ray diffraction (XRD) pattern and vibrating sample magnetometer (VSM) curve. This method has advantages such as high efficiency of the heterogeneous catalyst, the use of environmentally-friendly solvent, high yields, short reaction times and easy isolation of the products and chromatography-free purification. Our outcomes illustrated that the present nanocatalyst with nearly spherical and Cauliflowerlike morphology and average particle size of 36 nm could be applied as an effective and magnetically recyclable catalyst without any significant decreasing of activity. Furthermore, the synergic effect of bimetallic Lewis acids was studied for the synthesis of imidazole derivatives.

show abstract

Mesoporous halloysite nanotubes modified by CuFe2O4 spinel ferrite nanoparticles and study of its application as a novel and efficient heterogeneous catalyst in the synthesis of pyrazolopyridine derivatives

Cited by 105 publications

References 35 publications

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Cu(ii) immobilized on Fe₃O₄@HNTs–tetrazole (CFHT) nanocomposite: synthesis, characterization, investigation of its catalytic role for the 1,3 dipolar cycloaddition reaction, and antibacterial activity

Design and preparation of ZnS‐ZnFe₂O₄: a green and efficient hybrid nanocatalyst for the multicomponent synthesis of 2,4,5‐triaryl‐1H‐imidazoles

Contact Info

Product

Resources

About

Mesoporous halloysite nanotubes modified by CuFe2O4 spinel ferrite nanoparticles and study of its application as a novel and efficient heterogeneous catalyst in the synthesis of pyrazolopyridine derivatives

Cited by 105 publications

References 35 publications

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Photocatalytic Degradation of Organic Pollutants over MFe2O4 (M = Co, Ni, Cu, Zn) Nanoparticles at Neutral pH

Cu(ii) immobilized on Fe3O4@HNTs–tetrazole (CFHT) nanocomposite: synthesis, characterization, investigation of its catalytic role for the 1,3 dipolar cycloaddition reaction, and antibacterial activity

Design and preparation of ZnS‐ZnFe2O4: a green and efficient hybrid nanocatalyst for the multicomponent synthesis of 2,4,5‐triaryl‐1H‐imidazoles

Contact Info

Product

Resources

About

Cu(ii) immobilized on Fe₃O₄@HNTs–tetrazole (CFHT) nanocomposite: synthesis, characterization, investigation of its catalytic role for the 1,3 dipolar cycloaddition reaction, and antibacterial activity

Design and preparation of ZnS‐ZnFe₂O₄: a green and efficient hybrid nanocatalyst for the multicomponent synthesis of 2,4,5‐triaryl‐1H‐imidazoles