scholarly journals Study on Reduction of 4-nitrophenol by Magnetic Maize Straw Supported with Copper Nanoparticles

2021 ◽  
Author(s):  
Yang Yu ◽  
Hong Guo ◽  
Pengyuan Wang ◽  
Shangru Zhai ◽  
Jiazhi Han ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Aqueous Solution ◽  
Catalytic Activity ◽  
Copper Nanoparticles ◽  
Agricultural Waste ◽  
High Catalytic Activity ◽  
Cu Nanoparticles ◽  
Carboxylate Groups ◽  
Maize Straw ◽  
Self Aggregation

Abstract In this work, magnetic maize straw was prepared by the amidation process using renewable maize straw as starting material. After magnetic succinylated maize straw (Mag-S-MS) was mixed with cupric ions aqueous solution, Cu (II) could be captured by the amino and carboxylate groups. Then, the bonded Cu (II) was converted to valuable Cu nanoparticles (Cu NPS). It was characterized by SEM-EDS, XRD, XPS, and TGA, which indicated Cu NPS were formed successfully on Mag-S-MS without self-aggregation and oxidation. The above nanocomposites could be employed as a catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). The effect of the dosage of Cu NPS loaded-Mag-S-MS, the initial concentrations of NaBH4 and 4-NP were investigated, and a possible mechanism was discussed. The catalyst maintained relatively high catalytic activity after five cycle tests. Due to its superparamagnetic nature, it could be quickly collected from the aqueous solution under a magnetic field. These results could provide a method for using agricultural waste in nano catalytic reaction.

PtAu alloy nanoparticles supported on thermally expanded graphene oxide as a catalyst for the selective oxidation of glycerol

RSC Advances ◽  
2015 ◽  
Vol 5 (47) ◽  
pp. 37112-37118 ◽  
Author(s):  
Gao-Yuan Yang ◽  
Shuai Shao ◽  
Yi-Hu Ke ◽  
Chun-Ling Liu ◽  
Hui-Fang Ren ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Selective Oxidation ◽  
High Catalytic Activity ◽  
Alloy Nanoparticles

Thermally expanded graphene oxide supported PtAu alloy nanoparticles showed high catalytic activity in the oxidation of glycerol in base-free aqueous solution.

scholarly journals N,N-Dimethylformamide-stabilized copper nanoparticles as a catalyst precursor for Sonogashira–Hagihara cross coupling

RSC Advances ◽  
2017 ◽  
Vol 7 (37) ◽  
pp. 22869-22874 ◽  
Author(s):  
Hideo Oka ◽  
Katsuya Kitai ◽  
Takeyuki Suzuki ◽  
Yasushi Obora
Keyword(s):  
Catalytic Activity ◽  
Copper Nanoparticles ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
High Catalytic Activity ◽  
Catalyst Precursor ◽  
Cross Coupling Reaction

We found that DMF-stabilized Cu NPs have high catalytic activity in the Sonogashira cross-coupling reaction at low catalyst loadings (0.2 mol%).

Colloidal Co single-atom catalyst: a facile synthesis strategy and high catalytic activity for hydrogen generation

2020 ◽  
Vol 22 (4) ◽  
pp. 1269-1274 ◽  
Author(s):  
Junkai Wang ◽  
Zhenxia Huang ◽  
Lilin Lu ◽  
Quanli Jia ◽  
Liang Huang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Hydrogen Generation ◽  
Single Atom ◽  
High Catalytic Activity ◽  
Mixing Process ◽  
Facile Synthesis ◽  
On Demand ◽  
Synthesis Strategy ◽  
Facile Route

A facile route for on-demand hydrogen production via simply controlling the mixing process of a KBH4 solution and an aqueous solution of ISOBAM-104 stabilized Co2+ ions.

Decorating of Ag and CuO on Cu Nanoparticles for Enhanced High Catalytic Activity to the Degradation of Organic Pollutants

Langmuir ◽  
2017 ◽  
Vol 33 (31) ◽  
pp. 7606-7614 ◽  
Author(s):  
Yu Liang ◽  
Zhe Chen ◽  
Wen Yao ◽  
Pengyi Wang ◽  
Shujun Yu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Organic Pollutants ◽  
High Catalytic Activity ◽  
Cu Nanoparticles

In situ Synthesis of Reduced Graphene Oxide Supported CoMo Nanoparticles as Efficient Catalysts for Hydrogen Generation from NH3BH3

2018 ◽  
Vol 232 (3) ◽  
pp. 431-443 ◽  
Author(s):  
Xigang Du ◽  
Yonghua Duan ◽  
Jun Zhang ◽  
Gang Mi
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Reduced Graphene Oxide ◽  
Hydrogen Generation ◽  
Sodium Molybdate ◽  
High Catalytic Activity ◽  
Ambient Conditions ◽  
Reduced Graphene

AbstractCoMo nanoparticles (NPs) supported on reduced graphene oxide (RGO) were synthesized by a one-stepin situco-reduction of an aqueous solution of cobalt(II) chloride, sodium molybdate dihydrate and graphene oxide (GO) using NaBH4as the sole reductant under ambient conditions. The powder XRD, FTIR, EDS and TEM were employed to characterize the structure, size and composition of the CoMo/RGO catalysts. The as-synthesized Co0.9Mo0.1/RGO catalysts exhibited high catalytic activity for the hydrolytic dehydrogenation of ammonia borane (AB) at room temperature. The as-synthesized Co0.9Mo0.1/RGO nanocatalysts exhibited much higher catalytic activity than Co/RGO, Mo/RGO and the RGO-free Co0.9Mo0.1counterpart. Moreover, kinetic studies indicate that the catalytic hydrolysis of AB by Co0.9Mo0.1/RGO has first order kinetics with respect to the the catalyst concentration, but zero order kinetics with respect to the substrate concentration. The Co0.9Mo0.1/RGO catalyst has a turnover frequency (TOF) of 15.8 mol H2·(mol·Co0.9Mo0.1/RGO)−1·min−1at 25°C. Furthermore, the Co0.9Mo0.1/RGO show good recyclability for hydrogen generation from an aqueous solution of AB, which enables the practical reuse of the catalysts. Hence, this general method can be easily extended to the facile preparation of other RGO-based metallic systems.

scholarly journals Size tunable elemental copper nanoparticles: extracellular synthesis by thermoanaerobic bacteria and capping molecules

2015 ◽  
Vol 3 (3) ◽  
pp. 644-650 ◽  
Author(s):  
Gyoung Gug Jang ◽  
Christopher B. Jacobs ◽  
Ryan G. Gresback ◽  
Ilia N. Ivanov ◽  
Harry M. Meyer, III ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Copper Nanoparticles ◽  
Biological Process ◽  
Cu Nanoparticles ◽  
Extracellular Synthesis ◽  
Elemental Copper ◽  
Reducing Bacteria ◽  
Metal Reducing Bacteria

Elemental Cu nanoparticles in aqueous solution were synthesized by a biological process using anaerobic metal-reducing bacteria and chelator and capping molecules.

scholarly journals Nanochannel-based heterometallic {ZnIIHoIII}–organic framework with high catalytic activity for the chemical fixation of CO2

RSC Advances ◽  
2021 ◽  
Vol 11 (16) ◽  
pp. 9731-9739
Author(s):  
Tao Zhang ◽  
Hongtai Chen ◽  
Hongxiao Lv ◽  
Qiaoling Li ◽  
Xiutang Zhang
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Catalytic Performance ◽  
High Catalytic Activity ◽  
Chemical Fixation ◽  
Efficient Detection ◽  
Honeycomb Material ◽  
Excellent Catalytic Performance ◽  
Organic Framework

The robust, double-walled, honeycomb material {[ZnHo(TDP)(H2O)]·2DMF·4H2O}n exhibits an excellent catalytic performance in the chemical fixation of CO2 and the efficient detection of Fe(iii) ions in aqueous solution.

AgPd@Pd/TiO2 nanocatalyst synthesis by microwave heating in aqueous solution for efficient hydrogen production from formic acid

2015 ◽  
Vol 3 (20) ◽  
pp. 10666-10670 ◽  
Author(s):  
Masashi Hattori ◽  
Daisuke Shimamoto ◽  
Hiroki Ago ◽  
Masaharu Tsuji
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Hydrogen Production ◽  
Formic Acid ◽  
Microwave Heating ◽  
High Catalytic Activity

AgPd@Pd nanocatalysts loaded on TiO2 were fabricated in aqueous solution using MW heating to suppress alloying for high catalytic activity.

scholarly journals High catalytic activity of Rh nanoparticles generated from cobaltocene and RhCl3 in aqueous solution

2019 ◽  
Vol 6 (10) ◽  
pp. 2704-2708 ◽  
Author(s):  
Wenjuan Wang ◽  
Roberto Ciganda ◽  
Changlong Wang ◽  
Ane Escobar ◽  
Angel M. Martinez-Villacorta ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Catalytic Activity ◽  
Transfer Hydrogenation ◽  
High Catalytic Activity ◽  
Hydrolysis Of

Cobalticinium chloride-stabilized RhNPs are very efficient catalysts for hydrolysis of H3N-BH3, reduction of 4-NP, hydrogenation of benzene and transfer hydrogenation.

High Catalytic Activity of Peptide Nanofibres Decorated with Ni and Cu Nanoparticles for the Synthesis of 5-Substituted 1H-Tetrazoles and N-Arylation of Amines

2017 ◽  
Vol 70 (10) ◽  
pp. 1127 ◽  
Author(s):  
Arash Ghorbani-Choghamarani ◽  
Zahra Taherinia
Keyword(s):  
Catalytic Activity ◽  
Carboxylic Acids ◽  
Rapid Development ◽  
Environmentally Friendly ◽  
Aryl Halides ◽  
High Catalytic Activity ◽  
Benzoic Acids ◽  
Ni Nanoparticles ◽  
Cu Nanoparticles ◽  
Aryl Amines

A rapid development of a new methodology for decarboxylative N-arylation of carboxylic acids and the preparation of 5-substituted 1H-tetrazoles catalysed by peptide nanofibres decorated with Cu and Ni nanoparticles is presented. Compared with conventional aryl halides, benzoic acids are extremely interesting and environmentally friendly options for the synthesis of secondary aryl amines.

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