One-step preparation of magnetic recyclable quinary graphene hydrogels with high catalytic activity

Zhang, Junshuai; Yao, Tongjie; Guan, Chenchen; Zhang, Nanxi; Cui, Tieyu; Wu, Jie; Zhang, Xiao

doi:10.1016/j.jcis.2016.12.019

Cited by 15 publications

(6 citation statements)

References 41 publications

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“…The catalytic performance of the Fe x O y /PdPt@CeO 2 nanoreactors was evaluated based on their ability to affect the reduction of methylene blue (MB) dye in the presence of NaBH 4 . It is noteworthy that this system has been used previously as a model reaction to evaluate the catalytic activity of other noble metal NP‐based catalysts . Figure S4a shows the UV/Vis spectrum of the original MB solution, which was dark‐blue in color with a maximum absorbance wavelength ( λ max ) of 665 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Core-level XPS spectra of (a) Ce 3d;(b) Fe 2p;(c) Pt 4f;(d) Pd 3d in the yolk/shell Fe x O y /PdPt@CeO 2 nanoreactors.Chem. AsianJ .2017, 12,1400 -1407 www.chemasianj.org am odel reactiont oe valuate the catalytic activity of other noble metal NP-based catalysts [42][43][44]. FigureS4a shows the UV/ Vis spectrum of the original MB solution, which was dark-blue in color with am aximum absorbance wavelength( l max )o f 665 nm.…”

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confidence: 99%

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Preparation of Magnetically Recyclable Yolk/Shell Fe_xO_y/PdPt@CeO₂ Nanoreactors with Enhanced Catalytic Activity

Yao

Guan

Zhang

et al. 2017

Chemistry An Asian Journal

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Noble metal nanoparticles (NPs) have recently received considerable attention from researchers working in the field of catalysis. However, the development of new methods allowing these materials to reach their maximum catalytic properties remains challenging. Nanoreactors could lead to dramatic improvements in activity with the help of the intrinsic confinement effect. In this study, we designed a series of yolk/shell Fe O /PdPt@CeO composites, where the Fe O NPs acted as a movable core, allowing for the uniform distribution of the PdPt alloys on the inner surface of the CeO shell. The high porosity and existence of hollow voids in the CeO shell allowed these Fe O /PdPt@CeO composites to be used as nanoreactors in catalytic reactions. As well this confinement effect, we identified two structural features that led to enhanced catalytic activity, including (i) the replacement of monometallic NPs with a bimetallic PdPt alloy and (ii) the replacement of a chemically inert support with a reactive CeO shell. The resulting nanoassembled catalysts displayed higher activities toward the catalytic reduction of dyes than the reference samples. Moreover, these catalysts were readily recovered and reused because of the magnetic Fe O core.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Preparation of Magnetically Recyclable Yolk/Shell Fe_xO_y/PdPt@CeO₂ Nanoreactors with Enhanced Catalytic Activity

Yao

Guan

Zhang

et al. 2017

Chemistry An Asian Journal

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“…The system showed the best catalytic activity for low cross-linking concentrations, which the authors suggest being associated to the enhancement of system affinity towards the substrate and due to the good dispersion of Fe 3 O 4 , having attained a detection limit of 1.5 × 10 −6 mol L −1 with a linear detection range of 1.5–9.8 × 10 −6 mol L −1 [ 57 ]. The reader is referred to other articles if has an interest in the exploration of catalysis with magnetogels [ 58 , 59 , 60 , 61 ].…”

Section: Properties and Applications Of Magnetogelsmentioning

confidence: 99%

Magnetogels: Prospects and Main Challenges in Biomedical Applications

et al. 2018

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Drug delivery nanosystems have been thriving in recent years as a promising application in therapeutics, seeking to solve the lack of specificity of conventional chemotherapy targeting and add further features such as enhanced magnetic resonance imaging, biosensing and hyperthermia. The combination of magnetic nanoparticles and hydrogels introduces a new generation of nanosystems, the magnetogels, which combine the advantages of both nanomaterials, apart from showing interesting properties unobtainable when both systems are separated. The presence of magnetic nanoparticles allows the control and targeting of the nanosystem to a specific location by an externally applied magnetic field gradient. Moreover, the application of an alternating magnetic field (AMF) not only allows therapy through hyperthermia, but also enhances drug delivery and chemotherapeutic desired effects, which combined with the hydrogel specificity, confer a high therapeutic efficiency. Therefore, the present review summarizes the magnetogels properties and critically discusses their current and recent biomedical applications, apart from an outlook on future goals and perspectives.

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“…Hollow-structured mesoporous materials with unique features of high surface area, high permeability, low density, confined inner cavity, and optical properties have been of great interest and received much research, which makes them a promising application in drug delivery systems [1][2][3], chemical and catalysts [4][5][6][7][8][9][10], biological sensors [11][12][13][14][15][16][17], and solar cells [18][19][20]. For example, the inner cavity of the hollow structure is very essential for drug delivery by offering a large volume transportation for DNA, drugs, and cosmetics [21,22].…”

Section: Introductionmentioning

confidence: 99%

Controllable Architecture of Mesoporous Double-Nanoshell SiO2/TiO2 Hollow Tube Based on Layer by Layer Method

Chen

Zhang

et al. 2021

Journal of Nanomaterials

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Double-shell tubular on-dimensional structure can be fabricated through a layer by layer method, in which the core template was removed to create the tubular shape. In this paper, we report, for the first time, the double nanoshell SiO2/TiO2 hollow tubes prepared through a layer-by-layer deposition method involving the sol-gel process for the SiO2 and TiO2 generation. During TEOS and TEOT hydrolysis/condensation for the SiO2 and TiO2 shell layer formation, cetyltrimethylammonium bromide (CTAB) is adopted both as the structure-directing template and as the mesopore-channel template distributing around the shell. The obtained double-nanoshell hollow tubes illustrate a large surface area and high pore volume. Also, mesoporous double-nanoshell SiO2/TiO2 hollow tubes have the inner and outer shell thickness of about 80 nm and 120 nm, respectively. Plus, the shell thickness of SiO2 and TiO2 is controllable depending on the used concentration of TEOS and TEOT during their sol-gel process. Therefore, the technique for the preparation of SiO2/TiO2 mesoporous double-nanoshell hollow tubes could provide new insights into the construction of mesoporous double-shell and hollow structure for other multicomponent and hierarchical hybrid systems.

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One-step preparation of magnetic recyclable quinary graphene hydrogels with high catalytic activity

Cited by 15 publications

References 41 publications

Preparation of Magnetically Recyclable Yolk/Shell Fe_xO_y/PdPt@CeO₂ Nanoreactors with Enhanced Catalytic Activity

Preparation of Magnetically Recyclable Yolk/Shell Fe_xO_y/PdPt@CeO₂ Nanoreactors with Enhanced Catalytic Activity

Magnetogels: Prospects and Main Challenges in Biomedical Applications

Controllable Architecture of Mesoporous Double-Nanoshell SiO2/TiO2 Hollow Tube Based on Layer by Layer Method

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One-step preparation of magnetic recyclable quinary graphene hydrogels with high catalytic activity

Cited by 15 publications

References 41 publications

Preparation of Magnetically Recyclable Yolk/Shell FexOy/PdPt@CeO2 Nanoreactors with Enhanced Catalytic Activity

Preparation of Magnetically Recyclable Yolk/Shell FexOy/PdPt@CeO2 Nanoreactors with Enhanced Catalytic Activity

Magnetogels: Prospects and Main Challenges in Biomedical Applications

Controllable Architecture of Mesoporous Double-Nanoshell SiO2/TiO2 Hollow Tube Based on Layer by Layer Method

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Preparation of Magnetically Recyclable Yolk/Shell Fe_xO_y/PdPt@CeO₂ Nanoreactors with Enhanced Catalytic Activity

Preparation of Magnetically Recyclable Yolk/Shell Fe_xO_y/PdPt@CeO₂ Nanoreactors with Enhanced Catalytic Activity