Magnetically separable γ-Fe2O3 nanoparticles: An efficient catalyst for acylation of alcohols, phenols, and amines using sonication energy under solvent free condition

Bhosale, Manohar A.; Ummineni, Divya; Sasaki, Takehiko; Nishio–Hamane, Daisuke; Bhanage, Bhalchandra M.

doi:10.1016/j.molcata.2015.04.002

Cited by 57 publications

(22 citation statements)

References 66 publications

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“…To address these issues, magnetic separation using an external magnetic field is a useful recovery method since it is faster and more efficient as compared to filtration and decantation (Pang et al, 2014;Cao et al, 2015). Besides, magnetic separable catalysts were reported to have good dispersion in reaction suspension, high mechanical stability, and desirable paramagnetic nature for easy separation and reuse (Bhosale et al, 2015). Recently, iron-containing catalysts have attracted wide interest since it is less toxic to the environment as compared to the late-transition metals (Patra et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…The current study adopted mechanochemical process/mechanical milling as a prospective Fe 2 O 3 -TiO 2 synthesis route. This synthesis method omits the use of volatile organic solvents, toxic reagents, and harsh reaction conditions (Bhosale et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the latest research not only emphasized on the development of simple and green routes for catalyst fabrication, but also focused on the practical application of the synthesized catalyst (Bhosale et al, 2015). Thus, the primary objective of the present work was to effectively degrade real PPME using a magnetically retrievable and reusable photocatalyst synthesized from an environmentally friendly and facile process.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of industrial pulp and paper mill effluent using synthesized magnetic Fe 2 O 3 -TiO 2 : Treatment efficiency and characterizations of reused photocatalyst

Subramonian

Chai

2017

Journal of Environmental Management

119

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In this work, heterogeneous photocatalysis was used to treat pulp and paper mill effluent (PPME). Magnetically retrievable FeO-TiO was fabricated by employing a solvent-free mechanochemical process under ambient conditions. Findings elucidated the successful incorporation of FeO into the TiO lattice. FeO-TiO was found to be an irregular and slightly agglomerated surface morphology. In comparison to commercial P25, FeO-TiO exhibited higher ferromagnetism and better catalyst properties with improvements in surface area (58.40 m/g), pore volume (0.29 cm/g), pore size (18.52 nm), and band gap (2.95 eV). Besides, reusability study revealed that FeO-TiO was chemically stable and could be reused successively (five cycles) without significant changes in its photoactivity and intrinsic properties. Additionally, this study demonstrated the potential recovery of FeO-TiO from an aqueous suspension by using an applied magnetic field or sedimentation. Interactive effects of photocatalytic conditions (initial effluent pH, FeO-TiO dosage, and air flow-rate), reaction mechanism, and the presence of chemical oxidants (HO, BrO, and HOCl) during the treatment process of PPME were also investigated. Under optimal conditions (initial effluent pH = 3.88, [FeO-TiO] = 1.3 g/L, and air flow-rate = 2.28 L/min), the treatment efficiency of FeO-TiO was 98.5% higher than the P25. Based on Langmuir-Hinshelwood kinetic model, apparent rate constants of FeO-TiO and P25 were 9.2 × 10 and 2.7 × 10 min, respectively. The present study revealed not only the potential of using magnetic FeO-TiO in PPME treatment but also demonstrated high reusability and easy separation of FeO-TiO from the wastewater.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Photocatalytic degradation of industrial pulp and paper mill effluent using synthesized magnetic Fe 2 O 3 -TiO 2 : Treatment efficiency and characterizations of reused photocatalyst

Subramonian

Chai

2017

Journal of Environmental Management

119

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“…Binding energies of Fe 2p 3/2 and Fe 2p 1/2 330 were 710.7 and 724.5 eV respectively, verifying the presence of Fe 3+ . An absence of peaks 331 around 707 and 719 eV ruled out the presence of Fe 2+ , firmly supporting the addition of γ-Fe 2 O 3 332 phase into TiO 2 [42]. Peaks corresponding to Ti 4+ were centered at 458.6 and 464.4 eV, which 333 were analogous to Ti 2p 3/2 and Ti 2p 1/2 , respectively.…”

Section: Effect Of Milling Speedmentioning

confidence: 68%

Using one-step facile and solvent-free mechanochemical process to synthesize photoactive Fe2O3-TiO2 for treating industrial wastewater

Subramonian

Chai

2017

Journal of Alloys and Compounds

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15In this present study, Fe 2 O 3 -TiO 2 photocatalyst was synthesized and used to degrade real 16 industrial wastewater, namely pulp and paper mill effluent (PPME). Fe 2 O 3 -TiO 2 was synthesized 17 via ball milling at ambient conditions without incorporating any solvent. Comprehensive 18 characterization studies and photocatalytic evaluations of the synthesized Fe 2 O 3 -TiO 2 were 19 conducted in this study. It was verified that Fe 2 O 3 -TiO 2 possessed crystalline structures of γ-20 Fe 2 O 3 , anatase and rutile TiO 2 . Also, a good dispersion of Fe and O elements within the TiO 2 21 framework could be attained. A detection of Fe-O-Ti bond elucidated a substitution of Ti 4+ by 22 Fe 3+ in the TiO 2 lattice sites through mechanical milling, which ultimately enhanced the 23 2 photocatalytic activities of Fe 2 O 3 -TiO 2 . Moreover, Fe 2 O 3 -TiO 2 exhibited enhanced catalytic 24properties in terms of specific surface area (58.40 m 2 /g), porosity (0.29 cm 3 /g), band gap (2.95 25 eV), and charge separation in comparison with commercial P25. The present work also proved 26 that both characteristics and photoactivity of Fe 2 O 3 -TiO 2 were significantly affected by its 27 synthesis conditions (milling time, milling speed, and Fe 2 O 3 loading). The highest treatment 28 efficiency of PPME (62.3% of chemical oxygen demand or COD removal) was achieved using 29 Fe 2 O 3 -TiO 2 , which was synthesized at 20 min, 250 rpm and 1 mol% of milling time, milling 30 speed and Fe 2 O 3 loading, respectively. Noticeably, the photoactivity of the Fe 2 O 3 -TiO 2 was more 31 superior than the P25 (40.6% of COD removal). This study proved that mechanochemical 32 process enabled the green synthesis of Fe 2 O 3 -TiO 2 that could be used in treatment of real 33 industrial wastewater. 34 35

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“…Interestingly, other catalysts, such as γ‐Fe 2 O 3 (Table , entry 25), CeCl 3 (Table , entry 28), and Cu/Cu 2 O (Table , entry 29), didn′t promote the hydrogenation of compound 1 a at all. Therefore, we concluded that cerium(IV) was active for the hydrogenation of deactivated α‐keto amides into α‐hydroxy amides, whereas cerium(III) was ineffective.…”

Section: Resultsmentioning

confidence: 99%

Nanoceria‐Catalyzed Selective Synthesis of α‐Hydroxy Amides through the Reduction of an Unusual Class of α‐Keto Amides

Mishra

Bhanage

2018

Asian J Org Chem

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Herein, we report the preparation of ah eterogeneous, efficient, and recyclable ceria nanosphere (NS) catalyst, which was prepared by hydrothermal synthesis with oxalic acid as ac apping agent. The morphology and thermal stability of the catalystw ere studied by using SEM, XRD, and thermogravimetric analysis (TGA). This nanoceria catalyst was used for the chemoselective hydrogenation of deactivated a-keto amides by using NaBH 4 .T his reaction did not work in the absence of the nanoceria catalyst. As eries of substituted hydroxy amides were prepared in very good yields with low catalyst loading.

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Magnetically separable γ-Fe2O3 nanoparticles: An efficient catalyst for acylation of alcohols, phenols, and amines using sonication energy under solvent free condition

Cited by 57 publications

References 66 publications

Photocatalytic degradation of industrial pulp and paper mill effluent using synthesized magnetic Fe 2 O 3 -TiO 2 : Treatment efficiency and characterizations of reused photocatalyst

Photocatalytic degradation of industrial pulp and paper mill effluent using synthesized magnetic Fe 2 O 3 -TiO 2 : Treatment efficiency and characterizations of reused photocatalyst

Using one-step facile and solvent-free mechanochemical process to synthesize photoactive Fe2O3-TiO2 for treating industrial wastewater

Nanoceria‐Catalyzed Selective Synthesis of α‐Hydroxy Amides through the Reduction of an Unusual Class of α‐Keto Amides

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