Studies on photocatalytic performance and supercapacitor applications of undoped and Cu-doped ZnO nanoparticles

Sivakumar, S.; Robinson, Yengkokpam; Mala, Nazir Ahmad

doi:10.1016/j.apsadv.2022.100344

Cited by 49 publications

(11 citation statements)

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“…The optical absorbance was measured ( Figure 8 a) to survey the energy absorption of the ZnO NPs. The band gap energy (E g ) of ZnO was estimated using Equation (2) [ 11 , 17 ]: (αhν) 2 = A(hν − E g ) where α, h, ν, and A are the absorption coefficient, Planck’s constant, frequency, and constant, respectively. The (αhν) 2 vs. hν curve, Figure 8 b, was used to calculate the E g value.…”

Section: Resultsmentioning

confidence: 99%

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Comparison of ZnO Nanoparticles Prepared by Precipitation and Combustion for UV and Sunlight-Driven Photocatalytic Degradation of Methylene Blue

Krobthong

Rungsawang

Wongrerkdee

2023

Toxics

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ZnO nanoparticles (NPs) were comparatively synthesized via precipitation and combustion techniques. The ZnO NPs synthesized via precipitation and combustion exhibited similar polycrystalline hexagonal wurtzite structures. The large crystal sizes of ZnO NPs were obtained from the ZnO precipitation in comparison with those from the ZnO combustion, while the particle sizes were in the same range. The functional analysis implied that the ZnO structures had surface defects. Moreover, absorbance measurement showed the same absorbance range in ultraviolet light. In the photocatalytic degradation of methylene blue, ZnO precipitation exhibited higher degradation performance than ZnO combustion. This was attributed to the larger crystal sizes of ZnO NPs, which provided an enduring carrier movement at semiconductor surfaces and reduced electron-hole recombination. Thus, the crystallinity of ZnO NPs can be considered an important factor in photocatalytic activity. Furthermore, precipitation is an interesting synthesizing method for preparing ZnO NPs with large crystal sizes.

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Section: Resultsmentioning

confidence: 99%

“…Precipitation and combustion are interesting methods because they are low-cost and rapid processes. ZnO was synthesized for precipitation using a variety of zinc sources, including Zn(CH 3 COO) 2 ·2H 2 O and Zn(NO 3 ) 2 ·6H 2 O [ 16 , 17 , 18 ]. These ZnOs had hexagonal wurtzite structures with a variety of morphologies.…”

Section: Introductionmentioning

confidence: 99%

Comparison of ZnO Nanoparticles Prepared by Precipitation and Combustion for UV and Sunlight-Driven Photocatalytic Degradation of Methylene Blue

Krobthong

Rungsawang

Wongrerkdee

2023

Toxics

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“…The phase and crystal structures of the pure ZnO, CZ-1, CZ-2, CZ-3, and CZ-4 samples were examined, and are shown in Figure 1a. The diffraction peaks corresponding to (100), (002), ( 101), ( 102), ( 110), ( 103), ( 200), (112), and (201) planes at 2θ values of 33,35,36,48,57,63,68,70, and 77°matched those of the hexagonal wurtzite structured ZnO (JCPDS no. 036-1451).…”

Section: Resultsmentioning

confidence: 99%

Biological Renewable Cellulose-Templated Zn_1–XCu_XO/Ag₂O Nanocomposite Photocatalysts for the Degradation of Methylene Blue

Lemecho,

Andoshe,

Gultom

et al. 2024

ACS Omega

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Herein, Cellulose-templated Zn 1−X Cu X O/Ag 2 O nanocomposites were prepared using biological renewable cellulose extracted from water hyacinth (Eichhornia crassipes). Cellulose-templated Cu-doped ZnO catalysts with different amounts of Cu as the dopants (1, 2, 3, and 4%) were prepared and denoted CZ-1, CZ-2, CZ-3, and CZ-4, respectively, for simplicity. The prepared catalysts were tested for the degradation of methylene blue (MB), and 2% Cu-doped ZnO (CZ-2) showed the best catalytic performance (82%), while the pure ZnO, CZ-1, CZ-3, and CZ-4 catalysts exhibited MB dye degradation efficiencies of 54, 63, 65, and 60%, respectively. The best catalyst (CZ-2) was chosen to further improve the degradation efficiency. Different amounts of AgNO 3 (10, 15, 30, and 45 mg) were used for the deposition of Ag 2 O on the surface of CZ-2 and denoted CZA-10, CZA-15, CZA-30, and CZA-45, respectively. Among the composite catalysts, CZA-15 showed remarkable degradation efficiency and degraded 94% of MB, while the CZA-10, CZA-30, and CZA-45 catalysts showed 90, 81, and 79% degradation efficiencies, respectively, under visible light within 100 min of irradiation. The enhanced catalytic performance could be due to the smaller particle size, the higher electron and hole separation and charge transfer efficiencies, and the lower agglomeration in the composite catalyst system. The results also demonstrated that the Cu-doped ZnO prepared with cellulose as a template, followed by the optimum amount of Ag 2 O deposition, could have promising applications in the degradation of organic pollutants.

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“…The resulting electron-hole pair reacts with water and oxygen to form highly reactive hydroxyl radicals and superoxide radical anions capable of mineralizing organic matter [9]. Based on the degradation profiles in figures 7(a) and 8(a), the photodegradation efficiency (D) can be determined using equation [46].…”

Section: Resultsmentioning

confidence: 99%

Crucial roles of structural, morphological, and optical properties in enhancing the photocatalytic performance of ZnO nanorods

Sugianto,

Astuti,

Ngurah Made

et al. 2023

Mater. Res. Express

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ZnO nanorods with different structural, morphological, and optical properties were fabricated using hydrothermal process by controlling hydrothermal reaction temperature. It has been presented that the structural, morphological and optical properties of the nanorods are strongly influenced by the hydrothermal reaction temperature. XRD results show that ZnO nanorods have a polycrystalline structure with hexagonal wurtzite. Increasing hydrothermal reaction temperature up to 100 C stimulates the vertically standing growth along the c-axis orientation on the substrate as shown in FESEM images. The growth is followed by the decrease of the transmittance and energy band-gap of the ZnO nanorods. The photocatalytic activity of ZnO nanorod was evaluated using the percentage degradation of Coomassie® Brilliant blue and Indigo carmine dyes as a function of irradiation time. The photodegradation efficiency of ZnO nanorods synthesized with hydrothermal reaction temperatures at 80, 90 and 100 °C for decolorization of Coomassie® Brilliant blue was 71%, 75% and 81%, respectively, while for Indigo carmine was 50%, 53% and 66%, respectively. The variations of efficiency values indicate that the structural, morphological, and optical properties of ZnO nanorods play an important role in photocatalytic activity.

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Studies on photocatalytic performance and supercapacitor applications of undoped and Cu-doped ZnO nanoparticles

Cited by 49 publications

References 50 publications

Comparison of ZnO Nanoparticles Prepared by Precipitation and Combustion for UV and Sunlight-Driven Photocatalytic Degradation of Methylene Blue

Comparison of ZnO Nanoparticles Prepared by Precipitation and Combustion for UV and Sunlight-Driven Photocatalytic Degradation of Methylene Blue

Biological Renewable Cellulose-Templated Zn_1–XCu_XO/Ag₂O Nanocomposite Photocatalysts for the Degradation of Methylene Blue

Crucial roles of structural, morphological, and optical properties in enhancing the photocatalytic performance of ZnO nanorods

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Studies on photocatalytic performance and supercapacitor applications of undoped and Cu-doped ZnO nanoparticles

Cited by 49 publications

References 50 publications

Comparison of ZnO Nanoparticles Prepared by Precipitation and Combustion for UV and Sunlight-Driven Photocatalytic Degradation of Methylene Blue

Comparison of ZnO Nanoparticles Prepared by Precipitation and Combustion for UV and Sunlight-Driven Photocatalytic Degradation of Methylene Blue

Biological Renewable Cellulose-Templated Zn1–XCuXO/Ag2O Nanocomposite Photocatalysts for the Degradation of Methylene Blue

Crucial roles of structural, morphological, and optical properties in enhancing the photocatalytic performance of ZnO nanorods

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Product

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Biological Renewable Cellulose-Templated Zn_1–XCu_XO/Ag₂O Nanocomposite Photocatalysts for the Degradation of Methylene Blue