Effect of reducing agents in the conversion of Cu 2 O nanocolloid to Cu nanocolloid

Andal, V.; Buvaneswari, G.

doi:10.1016/j.jestch.2016.09.003

Cited by 29 publications

(33 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cu NPs are still stable after a period of 11 hr; afterwards the colloidal suspensions changed their colors from dark brown to yellow and a bathochromic shift, decreasing the signal intensity (shown in the insert of Figure 1). This color change corresponds to the oxidation of metallic copper, in agreement with previous reports indicating that copper oxide has an intense yellow color [54], with a unique absorption band of between 400–500 nm of significant intensity, corresponding to the oxide (c band) [55]. The b and c bands belong to O–Cu–O and Cu–O–Cu charge transfer bands [56], and after 11 hr, both bands increase in intensity.…”

Section: Resultssupporting

confidence: 92%

Easy, Quick, and Reproducible Sonochemical Synthesis of CuO Nanoparticles

et al. 2019

View full text Add to dashboard Cite

Copper oxide nanoparticles (CuO NPs) were synthesized in air by reducing copper (II) sulfate pentahydrate salt (CuSO4·5H2O) in the presence of sodium borohydride. The reaction was stabilized with Hexadecyltrimethylammonium bromide (CTAB) in a basic medium and using ultrasound waves. Different molar ratios of CTAB:Cu2+ and NaBH4:Cu2+ were explored, to optimize the synthesis conditions, and to study the stability, size, and Zeta potential of the colloidal suspension. Optimum conditions to generate spherical, stable, and monodispersed nanoparticles with hydrodynamic diameters of 36 ± 1.3 nm were obtained, using 16 mM CTAB and 2 M NaBH4 (molar ratios Cu2+:CTAB:NaBH4 of 1:6:10). X-ray diffraction (XRD) was implemented, and a monoclinic CuO crystal system was formed. This demonstrated a monoclinic crystal system corresponding to CuO. The diffraction peaks were identified and confirmed according to their selected area electron diffraction (SAED) patterns.

show abstract

Section: Resultssupporting

confidence: 92%

Easy, Quick, and Reproducible Sonochemical Synthesis of CuO Nanoparticles

et al. 2019

View full text Add to dashboard Cite

show abstract

“…A fine copper powder might therefore be required. 7 The synthesis of copper metal from copper oxide can largely be achieved by either chemical reduction 8,9 or thermal treatment methods which include thermal decomposition or reduction of the oxide in the presence of a reactive gas at elevated temperatures. The reduction occurs in the sequence CuO → Cu 4 O 3 → Cu 2 O →Cu, in which Cu 4 O 3 is a metastable state.…”

Section: Introductionmentioning

confidence: 99%

Reduction of copper oxide powder by an inductively coupled thermal plasma

Bissett

Makhofane

Lötter

2022

SATNT

View full text Add to dashboard Cite

Additive manufacturing (AM) methods can be utilised to manufacture complex, custom Ti6Al4V components for medical implants. Infection at the bone-implant interface is a key reason for implant rejection. Advanced titanium implants with biocompatibility and antibacterial properties can be manufactured by modifying the titanium alloy with copper, which in small concentrations (< 1 at % copper) is a proven, non-toxic antibacterial agent. Copper can be embedded into the titanium implant during the AM process creating antibacterial functionality. In order to produce sufficiently fine metallic copper powder, copper oxide can be reduced, either by chemical reduction or thermal treatment methods. These include thermal decomposition or reduction of the oxide in the presence of a reactive gas at elevated temperatures. Making use of thermal treatment methods such as thermal plasma reduction, the process conditions can be tuned to manipulate the morphology and average particle size of the powders. The purpose of this study was to investigate the thermal plasma reduction of copper oxide to copper metal making use of the Tek-15 radio-frequency inductively coupled thermal plasma system at Necsa. In the presence of hydrogen, the black copper (II) oxide powder was converted to a dark red powder, while a yellow / orange coloured powder was obtained without hydrogen being present. A change in composition was observed using SEM-EDS and was confirmed by XRD analysis.

show abstract

“…The application of Cu 0 has recently been extended to more value-added products such as catalysts, antibacterial agents, optical materials, and gas sensors [ 3 , 4 , 5 , 6 ]. To satisfy the performance standards for these products, the Cu 0 particles should be nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Copper Nanoparticles from Cu2+-Spiked Wastewater via Adsorptive Separation and Subsequent Chemical Reduction

Hong

Ryu

2021

Nanomaterials

View full text Add to dashboard Cite

Copper in ionic form (Cu2+) should be removed from wastewater because of its harmful effects on human health. Meanwhile, Cu-metal nanoparticles (Cu0 NPs) are widely used in various applications such as catalysts, optical materials, sensors, and antibacterial agents. Here, we demonstrated the recovery of Cu2+ from wastewater and its subsequent transformation into Cu0 NPs, a value-added product, via continuous adsorption followed by chemical reduction by hydrazine. To separate and enrich Cu2+ from wastewater, a biosorbent that exhibits excellent selectivity and adsorption capacity toward Cu2+, i.e., polyethyleneimine-grafted cellulose nanofibril aerogel (PEI@CNF), was packed into a column and used to treat 20 mg/L Cu2+ wastewater at a flow rate of 5 mL/min. The Cu2+ adsorption reached equilibrium at 72 h, and the Cu2+-saturated column was eluted using 0.1 M of HCl. After five consecutive elutions of Cu2+ from the adsorbent column, a Cu2+-enriched solution with a concentration of 3212 mg/L was obtained. The recovered Cu2+ concentrate was chemically reduced to obtain Cu0 NPs by reaction with hydrazine as a reductant in the presence of sodium dodecyl sulfate (SDS) as a stabilizer. The solution pH and hydrazine/Cu2+ ratio strongly affected the reduction efficiency of Cu2+ ions. When 0.1 M of SDS was used, spherical 50–100 nm Cu0 NPs were obtained. The results demonstrate that Cu2+-spiked wastewater can be converted into Cu0 NPs as a value-added product via adsorption followed by chemical reduction.

show abstract

Effect of reducing agents in the conversion of Cu 2 O nanocolloid to Cu nanocolloid

Cited by 29 publications

References 27 publications

Easy, Quick, and Reproducible Sonochemical Synthesis of CuO Nanoparticles

Easy, Quick, and Reproducible Sonochemical Synthesis of CuO Nanoparticles

Reduction of copper oxide powder by an inductively coupled thermal plasma

Synthesis of Copper Nanoparticles from Cu2+-Spiked Wastewater via Adsorptive Separation and Subsequent Chemical Reduction

Contact Info

Product

Resources

About