Effects of reaction parameters on preparation of Cu nanoparticles via aqueous solution reduction method with NaBH4

2012 ◽  
Vol 22 (12) ◽  
pp. 2991-2996 ◽  
Author(s):  
Qing-ming LIU ◽  
De-bi ZHOU ◽  
Yu-ya YAMAMOTO ◽  
Kensuke KURUDA ◽  
Masazumi OKIDO
Keyword(s):  
Aqueous Solution ◽  
Reduction Method ◽  
Cu Nanoparticles ◽  
Reaction Parameters

Preparation of Cu nanoparticles with ascorbic acid by aqueous solution reduction method

2012 ◽  
Vol 22 (9) ◽  
pp. 2198-2203 ◽  
Author(s):  
Qing-ming LIU ◽  
Takehiro YASUNAMI ◽  
Kensuke KURUDA ◽  
Masazumi OKIDO
Keyword(s):  
Aqueous Solution ◽  
Ascorbic Acid ◽  
Reduction Method ◽  
Cu Nanoparticles

Sorption Profile of Hg(II) onto Mixed Phase of Copper Sulphide and Copper Sulphate

2011 ◽  
Vol 356-360 ◽  
pp. 537-546
Author(s):  
Yow Loo Au Yoong ◽  
Pei Lay Yap ◽  
Muralithran G. Kutty ◽  
Olaf Timpe ◽  
Malte Behrens ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Copper Sulphate ◽  
Surface Complexation ◽  
Mixed Phase ◽  
Copper Sulphide ◽  
Reaction Parameters ◽  
Sorption Behaviour ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Equilibrium Data

The use of surface oxidized covellite (CuS), namely mixed phase copper sulphide (CuS and CuSO4) was studied for the removal of mercury from aqueous solution under the effect of various reaction parameters (pH, time, Hg(II) concentration). From batch sorption studies, the equilibrium data revealed that the sorption behaviour of Hg(II) onto mixed phase copper sulphide follows well with Langmuir isotherm and the maximum sorption capacity (Qmax) determined ≈ 400mg Hg(II) /g of sorbent. Meanwhile, all the unreacted and reacted mixed phase copper sulphides were also characterized by Powder XRD, SEM and XPS techniques. The results indicated that the sorption of Hg(II) onto mixed phase copper sulphide occurs initially through the dissolution of surface oxidized CuSO4layer. After that, the surface complexation product formed and sorbed onto the surface of CuS. These outcomes suggest the potential ability of CuS in removing Hg(II) even if the CuS layer is being surrounded by oxidized layer of CuSO4.

scholarly journals Highly Active Trifloaluminate Ionic Liquids as Recyclable Catalysts for Green Oxidation of 2,3,6-Trimethylphenol to Trimethyl-1,4-Benzoquinone

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1469
Author(s):  
Piotr Latos ◽  
Agnieszka Siewniak ◽  
Natalia Barteczko ◽  
Sebastian Jurczyk ◽  
Sławomir Boncel ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Ionic Liquids ◽  
High Selectivity ◽  
Active Phase ◽  
Catalytic Performance ◽  
Reaction Parameters ◽  
Multiwalled Carbon ◽  
Highly Active ◽  
Recyclable Catalysts ◽  
Fold Excess

An effective method for the synthesis of 2,3,6-trimethyl-1,4-benzoquinone via the oxidation of 2,3,6-trimethylphenol as the key step in the in the preparation of vitamin E was presented. An aqueous solution of H2O2 was used as the oxidant and Lewis acidic trifloaluminate ionic liquids [emim][OTf]-Al(OTf)3, χAl(OTf)3 = 0.25 or 0.15 as catalysts. Trifloaluminate ionic liquids were synthesised by the simple reaction between 1-ethyl-3-methylimidazolium trifluoromethanesulfonate (triflate) [emim][OTf] and aluminium triflate used in sub-stoichiometric quantities. The influence of the reaction parameters on the reaction course, such as the amount and concentration of the oxidant, the amount of catalyst, the amount and the type of organic solvent, temperature, and the reaction time was investigated. Finally, 2,3,6-trimethyl-1,4-benzoquinone was obtained in high selectivity (99%) and high 2,3,6-trimethylphenol conversion (84%) at 70 °C after 2 h of oxidation using a 4-fold excess of 60% aqueous H2O2 and acetic acid as the solvent. The catalytic performance of trifloaluminate ionic liquids supported on multiwalled carbon nanotubes (loading of active phase: 9.1 wt.%) was also demonstrated. The heterogeneous ionic liquids not only retained their activity compared to the homogenous counterparts, but also proved to be a highly recyclable catalysts.

Removal of Indigo Blue in Aqueous Solution Using Fe/Cu Nanoparticles and C/Fe–Cu Nanoalloy Composites

2009 ◽  
Vol 207 (1-4) ◽  
pp. 307-317 ◽  
Author(s):  
Jésica Trujillo-Reyes ◽  
Víctor Sánchez-Mendieta ◽  
Arturo Colín-Cruz ◽  
Raúl A. Morales-Luckie
Keyword(s):  
Aqueous Solution ◽  
Cu Nanoparticles ◽  
Indigo Blue

Electroless Deposition of Copper Nanostructures in Aqueous Solution

2014 ◽  
Vol 1043 ◽  
pp. 114-118 ◽  
Author(s):  
Michael Tan ◽  
Lance de Jesus ◽  
Kathy Lois Amores ◽  
Ellaine Datu ◽  
Mary Donnabelle Balela
Keyword(s):  
Aqueous Solution ◽  
Electroless Deposition ◽  
Low Cost ◽  
Protective Agent ◽  
Cu Nanoparticles ◽  
One Dimensional ◽  
Cu Nanowires ◽  
Mean Diameter ◽  
Dimensional Growth ◽  
Cu Nanostructures

This paper reports a simple and low cost process for the synthesis of various Cu nanostructures by electroless deposition. Oxidation-stable Cu nanoparticles and nanowires were prepared in aqueous solution in the presence of protective agents. When gelatin is used as protective agent, only spherical Cu nanoparticles with a mean diameter in the range of 37 to 44 nm are formed in the solution. Smaller nanoparticles are prepared at a higher concentration of gelatin. When ethylene diamine is used instead of gelatin, one-dimensional growth of Cu nanowires is favored. Varying the amount of EDA and gelatin provides morphological control over the nanostructures.

scholarly journals Trends on Synthesis of Cu Nanoparticles by a Wet Reduction Method

2013 ◽  
Vol 20 (3) ◽  
pp. 11-18 ◽  
Author(s):  
Yong Moo Shin ◽  
Sang-Soo Chee ◽  
Jong-Hyun Lee
Keyword(s):  
Reduction Method ◽  
Cu Nanoparticles
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