TiO2/ZnO nanocomposite photocatalyst:Synthesis, characterization and their applicationfor degradation of humic acid from aqueous solution

Zulfikar, Muhammad Ali; Chandra, Anggia D.; Rusnadi,; Setiyanto, Henry; Handayani, Nurrahmi; Wahyuningrum, Deana

doi:10.14456/sjst-psu.2020.57

Cited by 4 publications

(4 citation statements)

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“…Based on the measurement of the maximum wavelength based on the percent reflectance using UV-Vis DRS, the band gap value determines the optical characteristics of the produced TiO 2 . Determination of the TiO 2 band gap is carried out indirectly using the Kubelka-Munk equation as follows (Zulfikar et al 2020):…”

Section: Resultsmentioning

confidence: 99%

“…One approach to enable the effective operation of TiO 2 in the visible light spectrum involves the incorporation of dopants like ZnO and SiO 2 , forming a TiO 2 /ZnO/SiO 2 composite (Alshoaibi & Islam 2021). ZnO offers greater electron mobility and a prolonged lifetime for photogenerated electrons through the formation of heterojunctions, therefore TiO 2 /ZnO/SiO 2 composites can effectively work in the visible light area (Zulfikar et al 2020). Meanwhile, the addition of SiO 2 is intended to facilitate the formation of Ti-O-Si bonds, inhibiting the transformation of anatase into rutile, enhancing mechanical strength in TiO 2 thin films, and increasing the surface area of TiO 2 material and thereby enhancing photocatalytic activity efficiency (Wang et al 2021).…”

Section: Introductionmentioning

confidence: 99%

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Efficient Removal of Pb(II) Ion Using Tio2/Zno/Sio2 Nanocomposite from Aqueous Solutions Via Adsorption-Photocatalysis Process

Hadian,

Alni,

Patah

et al. 2024

JSM

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This research aims to investigate the usage of a TiO2/ZnO/SiO2 (TZS) composite prepared via a 24-h hydrothermal process at 180° C to remove Pb(II) through adsorption-photocatalysis. Pb(II) exposure has known health risks, making this study significant. The research explores the impact of pH, the nanocomposite quantity, and contact time in the process. Adsorption-photocatalysis was carried out in the dark for 60 min, followed by irradiation with a 160-watt mercury lamp. The adsorption process of Pb(II) ion removal adhered to the pseudo-second-order model regarding kinetics, while the adsorption isotherm corresponded to the Freundlich isotherm. Additionally, the assessment of photocatalysis kinetics showed that the removal of Pb(II) ions followed a pseudo-first-order model, resulting in a 99.58% elimination of Pb(II) ions. Post-adsorption-photocatalytic treatment, a yellowish precipitate was observed. The XRD pattern result of the yellowish precipitate confirmed the presence of PbO as the formed Pb phase. The study concludes that the TiO2/ZnO/SiO2 nanocomposite as adsorbent-photocatalyst is a highly effective, efficient, and promising method to remove Pb(II) contamination from aqueous solutions.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient Removal of Pb(II) Ion Using Tio2/Zno/Sio2 Nanocomposite from Aqueous Solutions Via Adsorption-Photocatalysis Process

Hadian,

Alni,

Patah

et al. 2024

JSM

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“…Removal of organic matter by photocatalysis with TiO2 or ZnO has been carried out for more than two decades. Some studies combined semiconductors for the photodegradation of synthesized humic acids (Wang et al, 2013;Zulfikar et al, 2020;Turkten and Bekbölet, 2020) or dissolved organic matter (Li et al, 2022) under solar irradiation or artificial light. Bah et al (2023) found that there are few studies on photocatalysis with sunlight as the irradiation source.…”

Section: Introductionmentioning

confidence: 99%

Study of the effectiveness of a ZnO–TiO2 formulation in the degradation of humic substances in mature leachate by solar photocatalysis Brazil

Nohara,

Izário Filho,

Siqueira

et al. 2023

Rev. ambiente água

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Treatment of landfill leachate is an important environmental issue, especially in developing countries such as Brazil. Advanced oxidation processes (AOPs) have been considered interesting treatment alternatives. In this study, ZnO–TiO2 mixtures were incorporated into a paint polymer matrix and fixed onto supports. Paints were applied by overlapping coat layers on plates, resulting in high film thickness (600 ± 80 µm). Treatment of mature leachate by an AOP was conducted in a plug flow reactor connected to a stirred tank under solar irradiation. The objective was to evaluate the degradation of humic acid (HA) and fulvic acid + humins (FAH). The highest HA and FAH removal efficiencies were 62% ± 4.9% and 16% ± 4.2%, respectively. The kinetic model provided a coefficient of determination (R2) of 0.974. Rate constants for HA and FAH removal were 2.96 and 1.03 × 10−3 min−1, respectively. Statistical models for HA and FAH degradation had R2 values of 0.96 and 0.99, respectively. Both approaches indicated that HA degradation is greater at acidic pH and higher TiO2 concentrations. FAH degradation was favored by acidic pH and higher ZnO concentrations. Statistical models showed the same mean difference in conversion between replicate runs of HA and FAH, suggesting a uniform diffusion of fractions through catalysts. Keywords: heterogeneous photocatalysis, humic and fulvic acid, landfill leachate treatment, titanium dioxide, zinc oxide.

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“…Photocatalyst materials are generally made in powder form to maximize contact with organic dyes 14,15) . A powdered catalyst, on the other hand, needs a water separation process after the photocatalyst is completed 16) .…”

Section: Introductionmentioning

confidence: 99%

Improved Photocatalytic Activity of ZnO Film Prepared via Green Synthesis Method Using Red Watermelon Rind Extract

Rini¹,

Rati²,

Fadillah³

et al. 2022

Evergreen

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In this study, the zinc oxide (ZnO) films have been prepared via the green-synthesis method with rind extract of red watermelon (Citrullus lanatus) as bio-stabilizer, at various acidity (pH) conditions. The ZnO films were prepared as thin films by spin-coating colloidal ZnO onto a glass substrate. The physical properties of ZnO films were characterized using UV-Vis spectrophotometer, XRD, SEM/EDX, and FTIR. The photocatalytic activity of ZnO films was evaluated systematically in the degradation process of methylene blue (MB). The sample prepared at pH 12 possesses the highest purities and exhibits the maximum degradation percentage of 94.61%, with a reaction rate constant of 0.019 min -1 . The efficiency of the ZnO photocatalyst has a strong correlation with the pH value in the synthesis process. Based on the results of this study, ZnO films prepared via green synthesis using Citrullus lanatus show an effective photocatalytic activity in degradation of MB, so that it could be developed in the photocatalytic process of water purification.

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TiO2/ZnO nanocomposite photocatalyst:Synthesis, characterization and their applicationfor degradation of humic acid from aqueous solution

Cited by 4 publications

References 0 publications

Efficient Removal of Pb(II) Ion Using Tio2/Zno/Sio2 Nanocomposite from Aqueous Solutions Via Adsorption-Photocatalysis Process

Efficient Removal of Pb(II) Ion Using Tio2/Zno/Sio2 Nanocomposite from Aqueous Solutions Via Adsorption-Photocatalysis Process

Study of the effectiveness of a ZnO–TiO2 formulation in the degradation of humic substances in mature leachate by solar photocatalysis Brazil

Improved Photocatalytic Activity of ZnO Film Prepared via Green Synthesis Method Using Red Watermelon Rind Extract

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