Efficacy of zero-valent copper (Cu0) nanoparticles and reducing agents for dechlorination of mono chloroaromatics

Raut, Sandesh S.; Kamble, Sanjay P.; Kulkarni, Prashant S.

doi:10.1016/j.chemosphere.2016.06.031

Cited by 40 publications

(41 citation statements)

References 30 publications

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“…This decrease in rate constant may be due to metal surface oxidation or metal hydroxide/oxide deposition, which decreases the number of nanoparticles adsorptive and reactive sites [25]. According to Raut et al [32], these reuse studies are crucial to evaluate the catalytic effect repeatability and the degradation method savings.…”

Section: Initial Ph Influence (Ph 0 )mentioning

confidence: 99%

“…Other materials have been used as alternatives to iron, such as copper [28]. Although the studies with zero-valent copper nanoparticles (nZVC) are still scarce, the use of this material is highly attractive in degradation processes of organic compounds [30][31][32]. The redox potential of copper ( 0 = +0.34 V) is higher than iron's ( 0 = -0.44 V); copper acts as a good electron donor in solution and, therefore, participates in organic pollutants degradation by electrochemical reactions [32,33].…”

Section: Introductionmentioning

confidence: 99%

“…The use of copper nanoparticles on organic pollutants degradation processes have shown to be effective [31][32][33][34]. Studies demonstrate that metallic nanoparticles are capable of promoting the degradation of dyes, which occurs by reductive [35,36] or oxidative processes [34,37].…”

Section: Introductionmentioning

confidence: 99%

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Degradation of the Reactive Blue 4 Dye in Aqueous Solution Using Zero-Valent Copper Nanoparticles

Marcelo

Puiatti

Nascimento

et al. 2018

Journal of Nanomaterials

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The degradation of the Reactive Blue 4 (RB4) dye by zero-valent copper nanoparticles (nZVC) was investigated. Degradation rates of approximately 90% were reached within 10 minutes of reaction. Total Organic Carbon (TOC) analysis shows that the dye molecules undergo mineralization, therefore indicating the degradation process is oxidative. Experimental tests, held in the presence of tertiary butyl alcohol, acting as a hydroxyl radicals (∙OH) captor, and copper (I) oxide, demonstrated that the reaction mechanism is governed by the concentration of Cu (I) instead of ∙OH. The second-order kinetics model was the most appropriate one to explain the experimental data. Higher values of the reaction rate constant were obtained in higher temperatures and higher nZVC doses and in lower RB4 initial concentrations. The initial pH in more acidic conditions (3 and 4) was kinetically more favorable to the degradation reaction; the activation energy was estimated to be 42 kJ mol−1 based on calculations using the experimental data. Finally, the recovered nanoparticles were utilized on a new reaction cycle, showing a small loss of their efficiency and catalytic activity.

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Section: Initial Ph Influence (Ph 0 )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Degradation of the Reactive Blue 4 Dye in Aqueous Solution Using Zero-Valent Copper Nanoparticles

Marcelo

Puiatti

Nascimento

et al. 2018

Journal of Nanomaterials

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“…The nZVC were prepared with adjustments to the methodology reported by Raut et al 19 The mass of CuSO 4 .5H 2 O (8.846 g) was transferred to 100 mL of ethanol-water mixture (4:1, v/v) (0.354 mol L -1 ) and the system was stirred for 20 min. After stirring, sodium borohydride solution (1.080 mol L -1 ) was added dropwise to the mixture at a rate of about 2 drops per second with constant stirring, for about 1 h. After metal reduction, the copper nanoparticles were filtered, washed with water and ethanol and then stored in freezer (at -20 °C).…”

Section: Nzvc Synthesismentioning

confidence: 99%

“…Copper is a mild hydrogenation catalyst 16,21 and was used to promote the contaminants dehalogenation such as dichloromethane 16 and chloroaromatic compounds 19 in the presence of sodium borohydride. In addition, ZVC is a good electron donor 17 and can participate in degradation processes via electrochemical reactions.…”

Section: Introductionmentioning

confidence: 99%

Removal of Beta-Lactams Antibiotics through Zero-Valent Copper Nanoparticles

Oliveira¹,

Nascimento²,

Guimarães³

et al. 2018

J. Braz. Chem. Soc.

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The removal of the beta-lactam antibiotics (ceftriaxone and cefadroxil) through zero-valent copper nanoparticle (nZVC) was studied in this work. Excellent removal degrees (> 85%) were obtained for both analytes in only 20 min of reaction. Studies were performed in both oxic and anoxic conditions, and in the presence of t-butyl alcohol (TBA), an inhibitor of radicals. The results did not show significant changes. Therefore, the hydroxyl radicals are not the main species responsible for the removal. Total organic carbon cefadroxil analysis indicated a removal of 57% after 180 min of reaction. Studies involving Cu + indicated that probably these are the principal species responsible for the removal of antibiotics. Kinetic studies have shown that two-phase reaction occurred in the antibiotics removal process and both phases followed pseudo-first order kinetic model. The first mechanism is related to the antibiotics degradation by Cu + species and the second mechanism is related to the antibiotics adsorption by hydroxides/oxides of Cu 2+ species.

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Production of Heterocyclic Primary Amines from Heterocyclic Aldehydes on Ni‐Mo/ZrO₂

et al. 2022

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Ni-Mo/ZrO 2 catalysts with Ni-Mo loadings of 10 wt % were prepared by a sol-gel method on a ZrO 2 support and subsequently applied in the simple reductive amination of heterocyclic aldehydes. Among the various catalysts prepared, Ni-Mo/ZrO 2 catalysts with Ni:Mo = 2:1 exhibited the highest metal dispersion and the smallest Ni particle size. The results showed that the catalyst has good catalytic performance, in which the yield of furfurylamine can reach 96.6 %. Initially, oximes were synthesized from the corresponding aldehydes and hydroxylamine hydrochloride, and then heterocyclic primary amines were synthesized by simple hydroreductive amination of the oximes with a 12 % methanolic solution of NH 3 in the presence of an Ni-Mo/ZrO 2 catalyst. The methanolic solution of NH 3 was found to be more effective in inhibiting the formation of secondary and tertiary amines.

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Efficacy of zero-valent copper (Cu0) nanoparticles and reducing agents for dechlorination of mono chloroaromatics

Cited by 40 publications

References 30 publications

Degradation of the Reactive Blue 4 Dye in Aqueous Solution Using Zero-Valent Copper Nanoparticles

Degradation of the Reactive Blue 4 Dye in Aqueous Solution Using Zero-Valent Copper Nanoparticles

Removal of Beta-Lactams Antibiotics through Zero-Valent Copper Nanoparticles

Production of Heterocyclic Primary Amines from Heterocyclic Aldehydes on Ni‐Mo/ZrO₂

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Efficacy of zero-valent copper (Cu0) nanoparticles and reducing agents for dechlorination of mono chloroaromatics

Cited by 40 publications

References 30 publications

Degradation of the Reactive Blue 4 Dye in Aqueous Solution Using Zero-Valent Copper Nanoparticles

Degradation of the Reactive Blue 4 Dye in Aqueous Solution Using Zero-Valent Copper Nanoparticles

Removal of Beta-Lactams Antibiotics through Zero-Valent Copper Nanoparticles

Production of Heterocyclic Primary Amines from Heterocyclic Aldehydes on Ni‐Mo/ZrO2

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Production of Heterocyclic Primary Amines from Heterocyclic Aldehydes on Ni‐Mo/ZrO₂