The effect of the Cu+/Cu2+ ratio on the redox reactions by nanoflower CuNiOS catalysts

Chen, Xiaoyun; Kuo, Dong‐Hau; Saragih, Albert Daniel; Zongyan, Wu; Abdullah, Hairus; Lin, Juan

doi:10.1016/j.ces.2018.02.016

Cited by 61 publications

(25 citation statements)

References 77 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This may be caused by the generation of high‐valence species which is more favorable with the existence of lattice oxygen and oxygen vacancies. It was reported that the redox reaction involved electron or hole transport between Cu + and Cu 2+ and a lower Cu + /Cu 2+ ratio favored the oxidation reaction . Meanwhile, the rate of redox reactions was controlled by coexisting Cu 2+ and Fe 3+ .…”

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of CuMgFe Layered Double Hydroxides for Efficient Catalytic Phenol Hydroxylation under Mild Conditions

Shen

Liang

et al. 2020

ChemistrySelect

View full text Add to dashboard Cite

A series of CuMgFe layered double hydroxides (denoted as X/CuMgFe–LDHs) with different Cu contents were synthesized by co‐precipitation as catalysts for phenol hydroxylation under mild conditions. The as‐prepared samples were analyzed by X‐ray diffraction (XRD), scanning electron microscopy (SEM), inductively coupled plasma emission spectroscopy (ICP‐ES), N2 adsorption–desorption, Fourier transform infrared (FT‐IR), thermogravimetric differential scanning calorimetry (TG‐DSC), X‐ray photoelectron spectroscopy (XPS) and hydrogen temperature‐programmed reduction (H2‐TPR) to investigate the morphologies and physicochemical properties. As presented by the characterization results, introducing a certain amount of copper not only increased the amount of active metal centers but also formed more oxygen vacancies and lattice oxygen to promote electron transport between the double layers in LDHs. However, the excess copper would significantly disrupt the X/CuMgFe–LDH framework, declining the activity. Therefore, the 20/CuMgFe–LDH sample presented the best catalytic performance among all the catalysts in terms of activity, which was correlated with the layered structure, low‐temperature reducibility, oxygen species and low Cu+/Cu2+ and Fe2+/Fe3+ ratios. The catalyst could maintain good stability even after recycling for five times. Finally, a possible mechanism for phenol hydroxylation via Cu+–OV–Fe2+ and Cu2+–O–Fe3+ redox cycles on CuMgFe–LDHs was proposed.

show abstract

Section: Resultsmentioning

confidence: 99%

Facile Synthesis of CuMgFe Layered Double Hydroxides for Efficient Catalytic Phenol Hydroxylation under Mild Conditions

Shen

Liang

et al. 2020

ChemistrySelect

View full text Add to dashboard Cite

show abstract

“…The mechanism for the Cr (VI) reduction was proposed in our previous work . Here, we used RhB as an example to explore the rapid reduction of organic dye in the Cu Mg OS–NaBH 4 –organic dyes system.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 7e shows the high-resolution Cr2p XPS spectrum on CuMgOS-3 after reduction of Cr (VI). The peaks located at 573.0 eV and 575.9 eV could be assigned to the Cr (0) and Cr (III) peaks, [48,49] respectively. The Cr (0) and Cr (III) molar ratios on the catalysts were quantitatively calculated, and contained 78.4% Cr (0) and 21.6% Cr (III).…”

Section: Reduction Of Heavy Metalsmentioning

confidence: 99%

“…prepared Cu‐doped ZnOS oxysulfide alloy films with high hole concentration of 4.3 × 10 19 cm −3 and its applications in spintronic devices. In our previous work, Cu Ni OS, Cu In OS, Zn Ni OS, Cu Mn OS and Cu Ni SeS catalysts were synthesized for reduction of 4‐nitrophenol with NaBH 4 , reduction of Cr (VI) under dark, hydrogen evolution under lower‐power UV light, or degradation of methylene blue (MB) in the dark . Comparing with other component metals, the bimetal oxysulfide catalysts displayed excellent catalytic activity, which can be contributed to the synergistic effect between the constituents and the additional degrees of freedom to boost its catalytic performance .…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work, CuNiOS, CuInOS, ZnNiOS, CuMnOS and CuNiSeS catalysts were synthesized for reduction of 4-nitrophenol with NaBH 4 , reduction of Cr (VI) under dark, hydrogen evolution under lower-power UV light, or degradation of methylene blue (MB) in the dark. [45][46][47][48][49][50][51] Comparing with other component metals, the bimetal oxysulfide catalysts displayed excellent catalytic activity, which can be contributed to the synergistic effect between the constituents and the additional degrees of freedom to boost its catalytic performance. [37,[51][52][53] The presence of two distinct metals in bimetal oxysulfide catalyst systems can provide an active center for the reaction, and offer a suitable situation for the reactant molecules to stimulate the catalytic process.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tubular bimetal oxysulfide CuMgOS catalyst for rapid reduction of heavy metals and organic dyes

Chen

Kuo

Zhang

et al. 2019

Applied Organom Chemis

Self Cite

View full text Add to dashboard Cite

Tubular bimetal oxysulfide CuMgOS catalyst was prepared using a feasible method at a low process temperature of 95°C. X‐ray diffractometry, X‐ray photoelectron spectrometry, field emission‐scanning electron microscopy, transmission electron microscopy, UV–Vis diffuse reflectance spectroscopy, photoluminescence emission spectrum, and nitrogen adsorption–desorption isotherms were used for CuMgOS characterizations. The CuMgOS reduction activities were investigated through the reduction of heavy metals of Cr (VI), Pb (II) and Hg (II) solutions, and the organic dyes of rhodamine‐B (RhB), methyl orange (MO) and methylene blue (MB) solutions under dark. The results showed that the CuMgOS prepared with an appropriate N2H4 amount for a suitable Cu (I)/Cu (II) ratio exhibited fast reduction activity without adding any reagents, with which the 100 mL Cr (VI), Pb (II) and Hg (II) solutions of 50 ppm were 100% reduced by 20 mg CuMgOS within 4 min, 6 min and 4 min, respectively. The 100 mL RhB, MO and MB solutions of 50 ppm were 100% reduced by 10 mg CuMgOS within 4 min, 5 min and 1 min, respectively, under the existence of NaBH4. CuMgOS displayed excellent chemical stability for the re‐use tests on heavy metal ions and organic dyes. The excellent performance is attributed to CuMgOS bimetal oxysulfide catalyst with active surface reaction centers to interact with reactants, and the carrier hopping between Cu (I) and Cu (II).

show abstract

Activated Carbon Anchoring Site Enrichment Through B and N Codoping for Boosting Bi₂Mo_2.5(S,O)₁₀ Oxysulfide Catalyst Stability and Visible‐Light‐Driven Hydrogen Evolution

Abdeta,

Wedajo,

et al. 2024

Advanced Sustainable Systems

View full text Add to dashboard Cite

Boron and nitrogen can enter the carbon lattice and provide structural disorder, porous structure, and active sites for better catalyst dispersions and activity. Herein, Bi2Mo2.5(S,O)10 oxysulfide (BiMoOS) anchored on unmodified and surface‐modified activated carbon (AC) via B and N doping is synthesized for efficient PHER, aiming that B and N doping into carbon framework can modify the surface textural features which act as anchoring sites for the host Bi2Mo2.5(S,O)10 and boost its photocatalytic activity by increasing specific surface area via preventing aggregation through a uniform distribution. Thus, the BiMoOS@B─N─AC catalyst achieved excellent stability and PHER performance (564.2 µmol h−1 H2 under visible light). The doped B and N in AC create structural disorder/defects, active sites and induce electron delocalization in B─N─AC, used as the anchoring sites for BiMoOS catalysts and stimulate the adsorption and activation kinetics of the H2O molecules, and also provide a highly conductive network that enhances charge transport and stability of BiMoOS@B─N─AC. With the advantages of the modified B─N─AC, the oxygen vacancy‐anchored BiMoOS exhibited superb PHER. Hence, B and N co‐doping into the carbon lattice is a promising approach to enriching the anchoring site for boosting metallic nanocatalyst stability and catalytic performance.

show abstract

The effect of the Cu+/Cu2+ ratio on the redox reactions by nanoflower CuNiOS catalysts

Cited by 61 publications

References 77 publications

Facile Synthesis of CuMgFe Layered Double Hydroxides for Efficient Catalytic Phenol Hydroxylation under Mild Conditions

Facile Synthesis of CuMgFe Layered Double Hydroxides for Efficient Catalytic Phenol Hydroxylation under Mild Conditions

Tubular bimetal oxysulfide CuMgOS catalyst for rapid reduction of heavy metals and organic dyes

Activated Carbon Anchoring Site Enrichment Through B and N Codoping for Boosting Bi₂Mo_2.5(S,O)₁₀ Oxysulfide Catalyst Stability and Visible‐Light‐Driven Hydrogen Evolution

Contact Info

Product

Resources

About

The effect of the Cu+/Cu2+ ratio on the redox reactions by nanoflower CuNiOS catalysts

Cited by 61 publications

References 77 publications

Facile Synthesis of CuMgFe Layered Double Hydroxides for Efficient Catalytic Phenol Hydroxylation under Mild Conditions

Facile Synthesis of CuMgFe Layered Double Hydroxides for Efficient Catalytic Phenol Hydroxylation under Mild Conditions

Tubular bimetal oxysulfide CuMgOS catalyst for rapid reduction of heavy metals and organic dyes

Activated Carbon Anchoring Site Enrichment Through B and N Codoping for Boosting Bi2Mo2.5(S,O)10 Oxysulfide Catalyst Stability and Visible‐Light‐Driven Hydrogen Evolution

Contact Info

Product

Resources

About

Activated Carbon Anchoring Site Enrichment Through B and N Codoping for Boosting Bi₂Mo_2.5(S,O)₁₀ Oxysulfide Catalyst Stability and Visible‐Light‐Driven Hydrogen Evolution