Rapid reduction of GO by hydrogen spill-over mechanism by in situ generated nanoparticles at room temperature and their catalytic performance towards 4-nitrophenol reduction and ethanol oxidation

Uniform Ni/SiO2 magnetic hollow microspheres were prepared by an in situ thermal decomposition and reduction route. Tiny Au nanoparticles (5 nm) were linked to Ni/SiO2 microspheres. The as-prepared Ni/SiO2@Au catalysts exhibited excellent catalytic activity for 4-nitrophenol reduction.

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Facile in situ redox synthesis of Au@Fe2O3 nanocomposites with multifunctional catalytic activity

Zeitschrift für Physikalische Chemie ◽

10.1515/zpch-2020-1628 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Zhuo Chen ◽

Xiao-jun Wei ◽

Jun Liu ◽

Xiao-meng Lv

Keyword(s):

Catalytic Activity ◽

Benzyl Alcohol ◽

Hybrid Composites ◽

Synthesis Method ◽

Catalytic Performance ◽

High Catalytic Activity ◽

Oxidation Of Benzyl Alcohol ◽

Nitrophenol Reduction ◽

Dispersed Gold

AbstractUsing freshly synthesized Fe(OH)2 matrix and HAuCl4 as precursor, l-lysine as stabilizer and linker, Au nanoparticles coated onto γ-Fe2O3 substrate were in-situ synthesized at room temperature. The Au@Fe2O3 hybrid composites with small highly dispersed gold particles (∼3 nm) exhibited high catalytic activity towards 4-nitrophenol reduction and the oxidation of benzyl alcohol. The results indicated the rate constant for 4-nitrophenol reduction was 5.3 × 10−2 s−1, and displayed efficient catalytic performance in terms of turnover number (TOF) of 134.8 h−1 for the oxidation of benzyl alcohol at 90 ± 1 °C. Furthermore, the facial electrode potential-driven in situ synthesis method paved the way of other metal nanoparticles over Fe2O3.

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Comparison of the catalytic performance of Au/TiO2 prepared by in situ photo-deposition and deposition precipitation methods for CO oxidation at room temperature under visible light irradiation

Catalysis Science & Technology ◽

10.1039/d1cy01829a ◽

2021 ◽

Author(s):

Qiuzhong Li ◽

Caijie Wu ◽

Ke Wang ◽

Xiaoxiao Wang ◽

Xun Chen ◽

...

Keyword(s):

Heat Treatment ◽

Visible Light ◽

Co Oxidation ◽

Visible Light Irradiation ◽

Room Temperature ◽

Catalytic Performance ◽

Light Irradiation ◽

Deposition Method

A Au/TiO2-PD sample was prepared by the mild in situ photo-deposition method and follow by heat treatment. As compared to the Au/TiO2-DP prepared by deposition precipitation, this Au/TiO2-PD sample owned...

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Ultra-Fast Degradation of p-Aminophenol by a Nanostructured Iron Catalyst

Molecules ◽

10.3390/molecules23092166 ◽

2018 ◽

Vol 23 (9) ◽

pp. 2166 ◽

Cited By ~ 2

Author(s):

Rocio Benavente ◽

David Lopez-Tejedor ◽

Carlos Perez-Rizquez ◽

Jose Palomo

Keyword(s):

Aqueous Solution ◽

Hydrogen Peroxide ◽

Room Temperature ◽

Iron Catalyst ◽

Catalytic Performance ◽

Environmental Pollutant ◽

Optimal Conditions ◽

Mentha X Piperita ◽

Liquid Extract

Full degradation of p-aminophenol in aqueous solution at room temperature by using a heterogeneous nanostructured iron hybrid catalyst in the presence of hydrogen peroxide is described. A nanostructured iron catalyst was prepared by in situ formation of iron carbonate nanorods on the protein network using an aqueous solution of an enzyme, lipase B from Candida antarctica (CAL-B). A second kind of iron nanostructured catalyst was obtained by the sunsequent treatment of the hybrid with an aqueous liquid extract of Mentha x piperita. Remarkable differences were observed using TEM imaging. When M. piperita extract was used, nanoparticles appeared instead of nanorods. Catalytic activity of these iron nanocatalysts was studied in the degradation of the environmental pollutant p-aminophenol (pAP) under different operating parameters, such as pH, presence of buffer or hydrogen peroxide concentration. Optimal conditions were pH 4 in acetate buffer 10 mM containing 1% (v/v) H2O2 for FeCO3NRs@CALB, while for FeCO3NRs@CALB-Mentha, water containing 1% (v/v) H2O2, resulted the best. A complete degradation of 100 ppm of pAP was achieved in 2 and 3 min respectively using 1 g Fe/L. This novel nanocatalyst was recycled five times maintaining full catalytic performance.

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In Situ Growth of Pd Nanosheets on g-C3 N4 Nanosheets with Well-Contacted Interface and Enhanced Catalytic Performance for 4-Nitrophenol Reduction

Small ◽

10.1002/smll.201801812 ◽

2018 ◽

Vol 14 (33) ◽

pp. 1801812 ◽

Cited By ~ 29

Author(s):

Kai Gu ◽

Xueting Pan ◽

Weiwei Wang ◽

Junjie Ma ◽

Yun Sun ◽

...

Keyword(s):

Catalytic Performance ◽

In Situ Growth ◽

Nitrophenol Reduction

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Synthesis of core–shell Au–Pt nanodendrites with high catalytic performance via overgrowth of platinum on in situ gold nanoparticles

Journal of Materials Chemistry A ◽

10.1039/c4ta04940c ◽

2015 ◽

Vol 3 (1) ◽

pp. 368-376 ◽

Cited By ~ 41

Author(s):

Yijing Li ◽

Wenchao Ding ◽

Mingrui Li ◽

Haibing Xia ◽

Dayang Wang ◽

...

Keyword(s):

Gold Nanoparticles ◽

Room Temperature ◽

Catalytic Performance ◽

Core Shell

Well-dispersed, core–shell Au–Pt nanodendrites were synthesized via overgrowth of platinum on in situ 5.5 nm gold nanoparticles at room temperature.

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Otoconia perfect/imperfect crystals

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100167949 ◽

1994 ◽

Vol 52 ◽

pp. 42-43

Author(s):

César D. Fermin ◽

Dale Martin

Keyword(s):

Image Processing ◽

Room Temperature ◽

Phosphotungstic Acid ◽

Gallus Domesticus ◽

Crystal Matrix ◽

Organic Templates ◽

Image Processing Algorithms ◽

Processing Algorithms ◽

Diffraction Patterns

Otoconia of higher vertebrates are interesting biological crystals that display the diffraction patterns of perfect crystals (e.g., calcite for birds and mammal) when intact, but fail to produce a regular crystallographic pattern when fixed. Image processing of the fixed crystal matrix, which resembles the organic templates of teeth and bone, failed to clarify a paradox of biomineralization described by Mann. Recently, we suggested that inner ear otoconia crystals contain growth plates that run in different directions, and that the arrangement of the plates may contribute to the turning angles seen at the hexagonal faces of the crystals.Using image processing algorithms described earlier, and Fourier Transform function (2FFT) of BioScan Optimas®, we evaluated the patterns in the packing of the otoconia fibrils of newly hatched chicks (Gallus domesticus) inner ears. Animals were fixed in situ by perfusion of 1% phosphotungstic acid (PTA) at room temperature through the left ventricle, after intraperitoneal Nembutal (35mg/Kg) deep anesthesia. Negatives were made with a Hitachi H-7100 TEM at 50K-400K magnifications. The negatives were then placed on a light box, where images were filtered and transferred to a 35 mm camera as described.

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