Preparation and photocatalysis of ZnO/bentonite based on adsorption and photocatalytic activity

Jida, Sena Megersa; Zereffa, Enyew Amare

doi:10.1088/2053-1591/acbf0f

Cited by 4 publications

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The study conducted by [81] on the adsorption and photocatalysis of Methylene Blue using a sodium carbonate-activated bentonite adsorbent and a ZnO/bentonite photocatalyst demonstrates an impressive 99.54% degradation efficiency with a photocatalyst of an average size of 30.06 nm. However, it is important to note that this study overlooks the potential influence of the polymer fraction in the nanocomposite synthesis process.…”

Section: Synchronized Influence Of Clay Nature Octahedral Cavity Occu...mentioning

confidence: 99%

Establishing the Link across the Synthesis Reaction Kinetics, Structural Changes, and Photocatalytic Efficiency of an Enhanced Chitosan–Clay (1:3) Nanocomposite

Albouchi,

Lahbib,

Mejri

et al. 2024

Solids

View full text Add to dashboard Cite

This research investigates the influence of synthesis kinetics on the structural and photocatalytic properties of chitosan–clay nanocomposites (Cs/MMT) and chitosan–hectorite nanocomposites (Cs/HET), employing an optimized initial stoichiometry of 1:3. Utilizing a variety of analytical techniques, including X-ray diffraction (XRD), transmission electron microscopy (TEM), and Fourier-transform infrared spectroscopy (FTIR), the study explores the structural evolution of the nanocomposites and their photocatalytic performance using semiconductor catalysts TiO2 and ZnO. The findings emphasize the significant impact of reaction kinetics, particularly after 3 h of reaction time, on the structural features of the nanocomposites. Notably, Cs/MMT demonstrates greater crystalline stability compared to Cs/HET due to variations in octahedral cavity occupancy in the initial clays. FTIR and TEM analyses depict the progressive evolution of the nanocomposites during the reaction, shedding light on how reaction kinetics drive the formation of specific bonds within the nanocomposites. In terms of photocatalytic activity, this study provides insights into the complex dynamics of photocatalytic degradation, with a specific focus on the performance of TiO2 and ZnO under diverse experimental conditions. The superior efficacy of TiO2 as a catalyst, particularly when integrated with Cs/MMT nanocomposites, is unequivocally demonstrated, with degradation rates exceeding 80%. This preference stems from TiO2 consistently exhibiting higher degradation rates compared to ZnO, attributed to structural disparities between montmorillonite and hectorite, influencing catalyst–support interactions. The findings underscore the critical importance of selecting suitable catalyst and support matrix combinations for optimizing performance in specific applications.

show abstract

Section: Synchronized Influence Of Clay Nature Octahedral Cavity Occu...mentioning

confidence: 99%

Establishing the Link across the Synthesis Reaction Kinetics, Structural Changes, and Photocatalytic Efficiency of an Enhanced Chitosan–Clay (1:3) Nanocomposite

Albouchi,

Lahbib,

Mejri

et al. 2024

Solids

View full text Add to dashboard Cite

show abstract

Gd2O3/CdS Nanocomposites were Synthesized for Photocatalytic Elimination of Methyl Blue (MB) Dye Under Visible Light Irradiation

Abdrabou,

Ahmed,

Khairy

et al. 2024

Int J Environ Res

View full text Add to dashboard Cite

Water contamination with hazardous dyes is a serious environmental issue that concerns humanity. A green technology to resolve this issue is the use of highly efficient photocatalysts under visible light to degrade these organic molecules. Adding composite and modifying shape and size on semiconductor materials are attempts to improve the efficacy of these compositions. The optical, microstructural and photocatalytic features of the compositions were investigated by several characterization procedures such as XRD, XPS, SEM, and TEM. Here, modifies Scherrer equation, Williamson–Hall (W–H), and Halder–Wagner method (H–W) have been used to investigate the crystal size and the micro-strain from the XRD peak broadening analysis. The average crystal size according to Modified Scherrer’s formula was 6.04–10.46 nm for pristine CdS and CdS/Gd2O3@GO, respectively. While the micro-strain (ɛ) corresponds to 3.88, 4.63, 4.03, and 4.15 for CdS, Gd2O3, CdS/Gd2O3, and CdS/Gd2O3@GO. It was also shown that the modest difference in average crystal size acquired by the Modified Scherrer and Halder–Wagner (HW) forms was related to differences in average particle size classification. As a result, the Halder–Wagner method was accurate in estimating crystallite size for the compositions. The average roughness is slightly changed from 4.4 to 4.24 nm for CdS/Gd2O3 and CdS/Gd2O3@GO, respectively. A kinetics investigation further revealed that the photocatalytic degradation of MB dyes was accompanied by a Langmuir isotherm and a pseudo-second-order reaction rate. The highest adsorption capacity (qe) determined for (type 1) CdS, Gd2O3, CdS/Gd2O3, and CdS/Gd2O3@GO adsorption was 5, 0.067, 0.027, and 0.012 mgg−1, respectively. The R2 values originated from the pseudo-second-order (type 2) for CdS, Gd2O3, CdS/Gd2O3, and CdS/ Gd2O3@GO were 0.904, 0,928, 0.825, and 0.977. As a result, the initial sorption rate (h) is altered between types 1 and 2. In type 2, the pseudo-second-order rate constant (k2) ranges from 0.005 for CdS to 0.011 for CdS/Gd2O3@GO. The Langmuir Hinshelwood and pseudo-second-order kinetic models describe the photodegradation process. The results demonstrate that the developed compositions can be used as a long-term substance for dye removal.

show abstract

Fabrication of bentonite/ZIF-8 composites for photocatalytic removal of congo red in water

Salsabila,

Ediati,

Fansuri

et al. 2024

Case Studies in Chemical and Environmental Engineering

View full text Add to dashboard Cite

Preparation and photocatalysis of ZnO/bentonite based on adsorption and photocatalytic activity

Cited by 4 publications

References 39 publications

Establishing the Link across the Synthesis Reaction Kinetics, Structural Changes, and Photocatalytic Efficiency of an Enhanced Chitosan–Clay (1:3) Nanocomposite

Establishing the Link across the Synthesis Reaction Kinetics, Structural Changes, and Photocatalytic Efficiency of an Enhanced Chitosan–Clay (1:3) Nanocomposite

Gd2O3/CdS Nanocomposites were Synthesized for Photocatalytic Elimination of Methyl Blue (MB) Dye Under Visible Light Irradiation

Fabrication of bentonite/ZIF-8 composites for photocatalytic removal of congo red in water

Contact Info

Product

Resources

About