Enhanced sunlight photocatalytic degradation of methylene blue by rod-like ZnO-SiO2 nanocomposite

Stanley, R.; Jebasingh, J. Alphas; S, Manisha Vidyavathy

doi:10.1016/j.ijleo.2018.11.084

Cited by 27 publications

(7 citation statements)

References 36 publications

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“…Figure 4 and Table 1 indicates the final solutions were analyzed by Uv-vis spectrophotometer in order to determine the absorbances treated by both catalysts and compared to control sample. ZnSi-5 materials under sunlight irradiation display higher degradation of MB than ZnSi-10, showing the ability to reduce the MB in line with results from previous researches [18,[24][25][26], where Zn2SiO4 was reported as an effective photocatalyst to degrade methyl orange (MO) in aqueous solution [27]. Therefore, this result stipulates another example of the utility of Zn2SiO4 mixed with silica crystalline used as catalyst for MB degradation.…”

Section: Resultssupporting

confidence: 88%

“…Meanwhile, the resulting solid materials were collected and characterized (XRD and SEM) in an attempt to verify the properties. Furthermore, catalytic activities of ZnSi-5 or ZnSi-10 were evaluated in order to remove MB following a slight modification in the process [24]. For instance, 5 mL of methylene blue (MB, 5 mg L -1 ) and 25 mg of ZnSi-5 or ZnSi-10 were mixed in separate transparent bottles and kept for 1 hour for adsorption-desorption equilibrium.…”

Section: Methodsmentioning

confidence: 99%

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ZnO-SiO2 and Zn2SiO4 Synthesis Utilizing Oil Palm Leaves for Degradation of Methylene Blue Dye in Aqueous Solution

Robkhob

Imboon

et al. 2020

J. Idn. Chem. Soc.

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A new approach was developed for the green synthesis of ZnO-SiO2 composite and Zn2SiO4 using zinc nitrate and sustainable silica precursor, oil palm (Elaeis guineensis) leaves (OPL). The products were synthesized at two different reaction temperatures through calcination in an open-air furnace at 500 and 1000 °C, respectively, and further identified with an X-ray diffractometry (XRD) analysis. The composite indicated by the presence of peaks at 2θ = 31.7°, 34.4°, 36.3°, 47.6°, 56.6°, and 62.9°, corresponds to ZnO and also revealed amorphous SiO2 at 2θ = 21°. Conversely, Zn2SiO4 was acknowledged at 2θ 25.6°, 31.50°, 34.0°, 39.5°, 48.9°, 56.5° and 65.6°, with crystalline silica at 2θ = 21.9°. The results showed the morphology of both products exhibited similar agglomeration based on scanning electron microscopy (SEM) analysis. Both products (ZnO-SiO2 composite and Zn2SiO4) possessed the capacity to degrade methylene blue (MB) under sunlight irradiation with efficiency of 85.9% and 69.3%, respectively.

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Section: Resultssupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

ZnO-SiO2 and Zn2SiO4 Synthesis Utilizing Oil Palm Leaves for Degradation of Methylene Blue Dye in Aqueous Solution

Robkhob

Imboon

et al. 2020

J. Idn. Chem. Soc.

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“…In the past, ZnO-based nanomaterials were found to possess photocatalytic properties capable of degrading MB in water, and various ZnO-based materials have been utilized as photocatalysts for the degradation of MB. Numerous ZnO-based nanoparticles, nanocomposites, and compounds formed by mixing with different materials have also been utilized as photocatalysts for the degradation of MB [ 10 , 11 , 12 ]. Similarly, a nanostructured ZnO film deposited on a Si substrate using reactive magnetron sputtering was utilized as a photocatalyst for the degradation of MB [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Degradation Effect of Methylene Blue for ZnO Nanorods Synthesized on Silicon and Indium Tin Oxide Substrates

et al. 2023

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In the context of ZnO nanorods (NRs) grown on Si and indium tin oxide (ITO) substrates, this study aimed to compare their degradation effect on methylene blue (MB) at different concentrations. The synthesis process was carried out at a temperature of 100 °C for 3 h. After the synthesis of ZnO NRs, their crystallization was analyzed using X-ray diffraction (XRD) patterns. The XRD patterns and top-view SEM observations demonstrate variations in synthesized ZnO NRs when different substrates were used. Furthermore, cross-sectional observations reveal that ZnO NRs synthesized on an ITO substrate exhibited a slower growth rate compared to those synthesized on a Si substrate. The as-grown ZnO NRs synthesized on the Si and ITO substrates exhibited average diameters of 110 ± 40 nm and 120 ± 32 nm and average lengths of 1210 ± 55 nm and 960 ± 58 nm, respectively. The reasons behind this discrepancy are investigated and discussed. Finally, synthesized ZnO NRs on both substrates were utilized to assess their degradation effect on methylene blue (MB). Photoluminescence spectra and X-ray photoelectron spectroscopy were employed to analyze the quantities of various defects of synthesized ZnO NRs. The effect of MB degradation after 325 nm UV irradiation for different durations can be evaluated using the Beer–Lambert law, specifically by analyzing the 665 nm peak in the transmittance spectrum of MB solutions with different concentrations. Our findings reveal that ZnO NRs synthesized on an ITO substrate exhibited a higher degradation effect on MB, with a rate of 59.5%, compared to NRs synthesized on a Si substrate, which had a rate of 73.7%. The reasons behind this outcome, elucidating the factors contributing to the enhanced degradation effect are discussed and proposed.

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“…The use of solar energy as renewable energy resource for photodecomposition is intended here as cost-effective technique. In this concern we have developed solar energy collectors which will help to improve the decomposition process faster, reducing expenses and minimizing toxic residues [22][23] in water.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of toxic Malachite Green dye by ZnO and ZnO/SiO2 nanocomposites under Solar Radiation –a green practice

Chatterjee¹,

Kumar²,

Rajesh³

et al. 2023

Preprint

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ZnO/SiO2 nanocomposites (NCs) have been prepared and evaluated in decomposing carcinogenic malachite green (MG)) under collected sunlight using parabolic solar collector. ZnO/SiO2 NCs and ZnO nanoparticles (NPs) were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and UV-Visible spectroscopy. XRD provides the structure of ZnO NPs as Hexagonal Wurzite with particle diameters in the range of 14–18 nm and nanocomposites are in the range of 14–19 nm. The average particle size estimated from TEM images was 17 for ZnO NPs and 21 nm for NCs. The band gap energy value is 3.30 eV for NCs, red shifted as compared to bulk ZnO (3.37 eV). BET surface area measurement shows microporous structure and increase in surface area for nanocomposites. Kinetic studies reveal pseudo first order reaction with faster photodecomposition for nanocomposites at optimum catalyst concentration of 0.5 gm/100ml at neutral pH. The maximum photodegradation efficiency reached up to 98.8% for ZnO/SiO2 NCs and 96.8% for ZnO NPs within just 40 minutes under collected sunlight irradiation. We have achieved 40% enhancement in photodegradation efficiency using solar collector as compared to natural sunlight. This study establishes the increase in photodegradation efficiency of ZnO/SiO2 nanocomposites as heterogeneous photocatalyst utilizing collection of solar energy as a renewable resource in a cost effective manner.

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Enhanced sunlight photocatalytic degradation of methylene blue by rod-like ZnO-SiO2 nanocomposite

Cited by 27 publications

References 36 publications

ZnO-SiO2 and Zn2SiO4 Synthesis Utilizing Oil Palm Leaves for Degradation of Methylene Blue Dye in Aqueous Solution

ZnO-SiO2 and Zn2SiO4 Synthesis Utilizing Oil Palm Leaves for Degradation of Methylene Blue Dye in Aqueous Solution

Comparison of the Degradation Effect of Methylene Blue for ZnO Nanorods Synthesized on Silicon and Indium Tin Oxide Substrates

Photodegradation of toxic Malachite Green dye by ZnO and ZnO/SiO2 nanocomposites under Solar Radiation –a green practice

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