Ag–Fe<sub>3</sub>O<sub>4</sub> nanocomposites@chitin microspheres constructed by in situ one-pot synthesis for rapid hydrogenation catalysis

Duan, Bo; Feng, Liqiang; He, Meng

doi:10.1039/c3gc42637h

Cited by 120 publications

(65 citation statements)

References 64 publications

(70 reference statements)

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“…Figure 4A showed X-ray The magnetic property of MCSM was analysed by VSM measurement at room temperature and demonstrated superparamagnetic behavior with 'S'-shaped hysteresis loop ( Figure 4B). 51,52 The saturation magnetization value of MCSM was found to be 27.6 emu, while the retentivity and coercivity values were 3.03 emu and 0.087 kOe, respectively. The hysteresis loop of control showed that the as-prepared MCSM has high thermal stability compared to the chitosan and very much suitable for the application in wastewater treatment.…”

Section: Introductionmentioning

confidence: 95%

Facile Synthesis of Silver Nanoparticles Decorated Magnetic-Chitosan Microsphere for Efficient Removal of Dyes and Microbial Contaminants

Ramalingam¹,

Khan

Mondal

et al. 2015

ACS Sustainable Chem. Eng.

124

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A facile and rapid synthesis of core-shell type magnetite-chitosan microsphere decorated with silver nanoparticles (MCSM) is described. The composition and structure of the as-synthesized microsphere characterized by various spectroscopic and microscopic techniques demonstrated formation of 3.63 µm MCSM with decoration of silver nanoparticles (AgNPs) having 16 ± 2.5 nm size. The thermogravimetric analysis (TGA) data showed good thermal stability, while vibrating sample magnetometer (VSM) analysis indicated the superparamagnetic behavior of the as-synthesized microsphere. The adsorptive removal and antimicrobial property of MCSM was explored for eco-friendly and cost effective water purification. The MCSM removed microbial contaminants and 99.5% of dyes from single as well as multi-component systems from water bodies efficiently. Furthermore, the dye removal capacity of MCSM was found to be higher compared to the other nanoadsorbents attributing to the high effective surface area of the microsphere and plenty of functional groups of shell structure of chitosan favored binding of dyes on MCSM. Moreover, the adsorbed dyes were desorbed from MCSM at higher pH values and regenerated MCSM was used for next cycle of dye removal. The magnetic behavior of MCSM facilitated easy separation using external magnetic field leading to recycling and reuse, while decoration of AgNPs on the microsphere inhibited the bacterial growth. The long term antibacterial activity of MCSM significantly improved the antifouling property to inhibit the biofilm formation on MCSM. The proposed core−shell type MCSM thus, provides a promising opportunity for cost-effective water purification.

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Section: Introductionmentioning

confidence: 95%

Facile Synthesis of Silver Nanoparticles Decorated Magnetic-Chitosan Microsphere for Efficient Removal of Dyes and Microbial Contaminants

Ramalingam¹,

Khan

Mondal

et al. 2015

ACS Sustainable Chem. Eng.

124

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“…Second, the separation of Ag NPs from the catalytic reaction systems by centrifugation or filtering is tedious and time-consuming, thus hampering the recovery and reusability of catalysts in aqueous solution. Moreover, the synthesis of Ag NPs always involves various hazardous and toxic reagents such as sodium borohydride and hydrazine hydrate [7][8][9][10][11]. Therefore, a novel design and synthesis of "green" Ag NPs with long-term stability and facile separation is highly desirable.…”

Section: Introductionmentioning

confidence: 99%

In situ synthesis of silver nanostructures on magnetic Fe₃O₄@organosilicon microparticles for rapid hydrogenation catalysis

Zhao

Gao

et al. 2015

RSC Adv.

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Novel protocol to prepare multifunctional magnetic organic-inorganic nanostructured catalyst of Fe 3 O 4 @organosilicon/Ag with tailored properties is developed. Such nanostructure design endows the catalyst with superparamagnetism (11.6 emu g -1 ), excellent oxidation resistance, and catalytic activity. Fe 3 O 4 nanoparticles (NPs) are encapsulated with porous organosilicon via improved self-assembly of flexible-bridged organosilicon precursor without templates. Subsequently, dispersed Ag NPs are in situ grown on the porous microparticles via silver mirror reaction. The as-prepared multifunctional catalysts are characterized by scanning electron microscopy, X-ray photoelectron spectroscopy, vibration sample magnetometer, X-ray diffraction, thermal gravimetric analysis, and nitrogen adsorption and desorption, respectively. The resultant hybrid microparticles possess microand nano-pores, and exhibit a small hysteresis loop and low coercivity.Meaningfully, they exhibit exceptional catalytic performance for the reduction of 4-nitrophenol in the presence of sodium borohydride and could be reused at least 9 times with excellent stability by means of convenient magnetic separation. The catalyst could be employed to reduce other dyes such as methylene blue, orange G and rhodamine B, and their corresponding reductions follow pseudo-first-order reaction. Therefore, the proposed structure design and scalable route for the synthesis of hierarchical catalyst can pave the way for synthesizing other catalyst systems to address the diverse reaction demands.

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“…16 In XRD pattern of Fe 3 O 4 ‐Ag/rGO‐1, one can see that five new peaks appear at 2θ = 38.1°, 44.1°, 64.4°, 77.3° and 81.3°, which are attributed to the (111), (200), (220), (311) and (222) crystal planes of the face centred cubic of Ag, verifying the coexistence of Fe 3 O 4 ‐Ag. Noted that the intensity of the diffraction peaks of rGO and Fe 3 O 4 in Fe 3 O 4 ‐Ag/rGO‐1 is much weaker than those of Ag, suggesting that the crystallization of rGO and Fe 3 O 4 is not as perfect as that of Ag . Strikingly, compared with Fe 3 O 4 ‐Ag/rGO‐2, the intensity of the diffraction peaks of Fe 3 O 4 ‐Ag/rGO‐1 is relatively lower, indicating the low‐crystalline state of Fe 3 O 4 and Ag in Fe 3 O 4 ‐Ag/rGO‐1.…”

Section: Resultsmentioning

confidence: 99%

Amorphizing of Ag Nanoparticles under Bioinspired One‐step Assembly of Fe₃O₄‐Ag/rGO Hybrids via Self‐redox Process with Enhanced Activity

Zhao

Jiang

et al. 2018

Applied Organom Chemis

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Efficient and reusable nanocatalysts fabricated via a facile assembly are highly desirable for the cost‐effective hydrogenation reduction. Inspired by a fishing process with a fishnet, multifunctional nanostructured catalysts are rationally designed to combine interesting features via the self‐redox assembly of Fe3O4‐Ag composites on reduced graphene oxide (rGO) (Fe3O4‐Ag/rGO). In detail, Fe3O4 nanoparticles (NPs) endow the ternary hybrids with superparamagnetism (21.42 emu g−1), facilitating catalysts to be separated from the reaction system. rGO could provide electron transfer pathways, enhancing catalytic activity. More interestingly, GO and Ag+ could behave as oxidants to oxidize Fe2+ for the in situ assembly of Fe3O4‐Ag/rGO without any addition of reductant/oxidant or organic solvents, and AgNPs endow the ternary hybrids with excellent catalytic behaviour. Meaningfully, the bioinspired process enables the ternary hybrids to possess more abundant micro−/nanopores, larger surface area, and more amorphization. They exhibit exceptional catalytic performance, and could be recycled with excellent activity by means of convenient magnetic separation (at least 7 times). Moreover, the ternary hybrids could degrade methylene blue under UV light due to different valence states of Fe in Fe3O4. Therefore, the proposed bioinspired assembly and structure design for hierarchical catalysts would pave a promising way to assemble other catalysts.

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Ag–Fe₃O₄ nanocomposites@chitin microspheres constructed by in situ one-pot synthesis for rapid hydrogenation catalysis

Abstract: Ag–Fe3O4@chitin microspheres were developed as a retrievable catalyst and a potential chromatography column packing material for organic synthesis.

Cited by 120 publications

References 64 publications

Facile Synthesis of Silver Nanoparticles Decorated Magnetic-Chitosan Microsphere for Efficient Removal of Dyes and Microbial Contaminants

Facile Synthesis of Silver Nanoparticles Decorated Magnetic-Chitosan Microsphere for Efficient Removal of Dyes and Microbial Contaminants

In situ synthesis of silver nanostructures on magnetic Fe₃O₄@organosilicon microparticles for rapid hydrogenation catalysis

Amorphizing of Ag Nanoparticles under Bioinspired One‐step Assembly of Fe₃O₄‐Ag/rGO Hybrids via Self‐redox Process with Enhanced Activity

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Ag–Fe3O4 nanocomposites@chitin microspheres constructed by in situ one-pot synthesis for rapid hydrogenation catalysis

Abstract: Ag–Fe3O4@chitin microspheres were developed as a retrievable catalyst and a potential chromatography column packing material for organic synthesis.

Cited by 120 publications

References 64 publications

Facile Synthesis of Silver Nanoparticles Decorated Magnetic-Chitosan Microsphere for Efficient Removal of Dyes and Microbial Contaminants

Facile Synthesis of Silver Nanoparticles Decorated Magnetic-Chitosan Microsphere for Efficient Removal of Dyes and Microbial Contaminants

In situ synthesis of silver nanostructures on magnetic Fe3O4@organosilicon microparticles for rapid hydrogenation catalysis

Amorphizing of Ag Nanoparticles under Bioinspired One‐step Assembly of Fe3O4‐Ag/rGO Hybrids via Self‐redox Process with Enhanced Activity

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Ag–Fe₃O₄ nanocomposites@chitin microspheres constructed by in situ one-pot synthesis for rapid hydrogenation catalysis

In situ synthesis of silver nanostructures on magnetic Fe₃O₄@organosilicon microparticles for rapid hydrogenation catalysis

Amorphizing of Ag Nanoparticles under Bioinspired One‐step Assembly of Fe₃O₄‐Ag/rGO Hybrids via Self‐redox Process with Enhanced Activity