A comparative study of Cu-anchored 0D and 1D ZnO nanostructures for the reduction of organic pollutants in water

Ali, Hazim M.; Hassan, Refat M.; Zeid, E. F. Abo; Al‐Hossainy, Ahmed F.; El-Aal, Mohamed Abd

doi:10.1039/d2ra02515a

Cited by 26 publications

(11 citation statements)

References 81 publications

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“…The 4-NP to 4-AP reduction procedures on the surface of NPs and NCs were adapted from a recent study. 18 To give a rich yellow color, 1.10 mL of 0.01 M (1.1 × 10 −4 M) 4-NP was mixed with 0.38 g/100 mL (0.1 M) of excess sodium borohydride (NaBH 4 ). In this case, NaBH 4 was used to reduce 4-NP to the 4-nitrophenolate ion.…”

Section: Methodsmentioning

confidence: 99%

Synthesis of copper–silver–zinc oxide nanocomposites for 4-nitrophenol reduction: doping and heterojunction

2023

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Section: Methodsmentioning

confidence: 99%

Synthesis of copper–silver–zinc oxide nanocomposites for 4-nitrophenol reduction: doping and heterojunction

2023

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“…To test the reduction potential of ZnO NPs and TNCs, the synthetic pollutants 4‐nitrophenol and methylene blue were used. According to a recent report, [54] with a slight concentration change, the ability of synthesized NPs and TNCs to catalyze the reduction of 4‐nitrophenol to 4‐aminophenol was tested. The experiment began with the preparation of a 0.01 M 4‐nitrophenol stock solution, which was then diluted to a concentration of 0.11 mM.…”

Section: Methodsmentioning

confidence: 99%

Synergistically Augmented ZnO via Cobalt and Copper Simultaneous Doping for Pollutant Reduction

et al. 2023

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Continuous electron‐hole transfer and the ability of nanoscale materials to absorb visible light are critical for pollutant catalytic reduction. Cobalt and copper co‐doped ZnO composites were shaped by the sol‐gel solution combustion (SG‐SC) approach. The x‐ray diffraction analysis confirmed the crystalline nature and interstitial doping of copper and cobalt in the zinc oxide lattice and the development of ZnO‐CuO local contact. The PL and DRS‐UV‐vis investigations showed the NCs’ superior charge transfer and considerable redshift (from 3.17 to 2.21 eV) properties over ZnO. TEM and SEM‐EDS analyses confirmed the foam‐type surface morphology, elemental composition, and dopant distribution. The NCs showed greater potency than ZnO NPs in the catalytic reduction reactions of 4‐nitrophenol and methylene blue. Thus, the SG‐SC approach has the potential for industrially scalable catalytic pollutant reduction applications.

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“…Procedure. The potential of NPs and NCs for 4-nitrophenol to 4-AP reduction was investigated using sodium borohydride (NaBH 4 ) as a reducing agent, as previously reported 45 with minor modifications. In detail, 1.10 mL of 0.01 M 4-NP was dissolved in 0.38 g/100 mL (0.1 M) of excess NaBH 4 to give a deep yellow color.…”

Section: Catalytic 4-nitrophenol Reductionmentioning

confidence: 99%

Cu/CuO-Doped ZnO Nanocomposites via Solution Combustion Synthesis for Catalytic 4-Nitrophenol Reduction

et al. 2023

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The synthesis of optoelectrically enhanced nanomaterials should be continuously improved by employing timeand energy-saving techniques. The porous zinc oxide (ZnO) and copper-doped ZnO nanocomposites (NCs) were synthesized by the time-and energy-efficient solution combustion synthesis (SCS) approach. In this SCS approach, once the precursor− surfactant complex ignition point is reached, the reaction starts and ends within a short time without the need for any external energy. The TGA−DTA analysis confirmed that 500 °C was the point at which stable metal oxide was obtained. The doping and heterojunction strategy improved the optoelectric properties of the NCs more than the individual constituents, which then enhanced the materials' charge transfer and optical absorption capabilities. The porosity, nanoscale crystallite size (15−50 nm), and formation of Cu/CuO-ZnO NCs materials were confirmed from the XRD, SEM, and TEM/HRTEM analyses. The obtained d-spacing values of 0.275 and 0.234 nm confirm the formation of ZnO and CuO crystals, respectively. The decrease in photoluminescence intensity for the doped NCs corroborates a reduction in electron−hole recombination. On the Mott−Schottky analysis, the positive slope for ZnO confirms the n-type character, while the negative and positive slopes of the NCs confirm the p-and n-type characters, respectively. A diffusion-controlled type of charge transfer process on the electrode surface was confirmed from the cyclic voltammetric analysis. Thus, the overall analysis shows the applicability of the less expensive and more efficient SCS for several applications, such as catalysis and sensors. To confirm this, an organic catalytic reduction reaction of 4-nitrophenol to 4-aminophenol was tested. Within three and a half minutes, the catalytic reduction result showed the great potential of NCs over ZnO NPs. Thus, the energy-and time-saving SCS approach has a great future outlook as an industrial pollutant catalytic reduction application.

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A comparative study of Cu-anchored 0D and 1D ZnO nanostructures for the reduction of organic pollutants in water

Abstract: Catalytic reduction of 4-NP over Cu/ZnO nanocomposites.

Cited by 26 publications

References 81 publications

Synthesis of copper–silver–zinc oxide nanocomposites for 4-nitrophenol reduction: doping and heterojunction

Synthesis of copper–silver–zinc oxide nanocomposites for 4-nitrophenol reduction: doping and heterojunction

Synergistically Augmented ZnO via Cobalt and Copper Simultaneous Doping for Pollutant Reduction

Cu/CuO-Doped ZnO Nanocomposites via Solution Combustion Synthesis for Catalytic 4-Nitrophenol Reduction

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