The impregnation of ZnO onto ZSM-5 derived from red mud for photocatalytic degradation of methylene blue (original) (raw)
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Characterization and Kinetic Study of Methylene Blue Photocatalytic on ZnO/ZSM-5
Indonesian Journal of Chemical Science, 2023
Photodegradation of organic pollutants depends significantly on the structure of metal oxide-based semiconductor photocatalysts. ZnO/ZSM-5 has shown the potential to significantly improve its photocatalytic efficiency for removing waterborne pollutants. ZnO/ZSM-5 has been reported to be an active catalyst for degrading methylene blue. These methods commonly involve various catalytic reactions, with the Langmuir-Hinshelwood process being used to describe the reaction kinetics. A kinetic study on the photocatalytic degradation of methylene blue using ZnO/ZSM-5 was conducted under UV-LED lamp irradiation. ZnO/ZSM-5 was characterized using XRD, SEM, and N2 adsorption-desorption, and it was prepared via the impregnation method. The interaction between ZnO/ZSM-5 and methylene blue solutions over a period of 30 to 180 minutes was monitored using a UV-Vis spectrophotometer. The photocatalytic degradation of methylene blue followed first-order rate kinetics. The Langmuir-Hinshelwood (L-H) kinetic analysis revealed that the photocatalytic reaction constant (kc) was 4.207 L.mg-1. menit-1 , and the Langmuir-Hinshelwood constant (K) was 261.509 L.mg-1 .
ZnO INCORPORATED ON NATURAL ZEOLITE FOR PHOTODEGRADATION OF METHYLENE BLUE
Rasayan Journal of chemistry, 2020
Zinc oxide was incorporated into natural zeolite (ZnO-NZ) by cation exchange followed by co-precipitation and calcination processes. The effect of the amount of ZnO loaded in the zeolite framework on the properties and photoactivity was studied. The resulted photocatalysts were characterized and were examined their photodegradation efficiency for methylene blue (MB) degradation under ultraviolet light. The results showed that ZnO was successfully incorporated and well distributed into the zeolite frameworks. The ZnO-NZ photocatalysts showed a higher specific surface area and wider bandgap than the bare ZnO. The photodegradation activity of ZnO-NZ for MB is twice as high as the bare ZnO. Moreover, the photodegradation activity for MB depends on the amount of ZnO loaded in the ZnO-NZ. Optimum MB photodegradation of 83.05% was obtained by using ZnO-NZ having 6.1% of ZnO fraction.
Photocatalytic Degradation of Methylene Blue using Zinc Oxide Synthesized by Hydrothermal Method
Academic Perspective Procedia
ZnO nanoparticals (ZnO-NPs) were synthesized by hydrothermal method at low temperatures over a range of different hydrothermal time periods and different calcination temperatures. The synthesized ZnO-NPs were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and nitrogen adsorption-desorption isotherms (BET). The XRD results showed that all ZnO-NPs were hexagonal wurtzite phase. The photocatalytic activities of the ZnO-NPs were tested through the degradation of methylene blue under UV light. The highest methylene blue (MB) degradation was found to be 99% with zinc oxide synthesized at 48 hours hydrothermal process time and 300 °C calcination temperature conditions during 3 hours degredation time. As a result, the synthesized by hydrothermal method at low temperatures ZnO-NPs have potential applications in the treatment of wastewater.
ZnO/montmorillonite for photocatalytic and photochemical degradation of methylene blue
Applied Clay Science, 2011
Synthesis of a ZnO/montmorillonite photocatalyst based on an Indonesian natural montmorillonite was conducted using a sol-gel intercalation method. The physicochemical properties of the material were determined by XRD, N 2 adsorption-desorption, SEM, TEM and UV-Vis diffuse reflectance. The activity was evaluated in photocatalytic and photochemical degradation of methylene blue (MB) with and without H 2 O 2 . Characterization showed that the ZnO particles were successfully distributed in montmorillonite support and ZnO/montmorillonite had lower band gap energy. The increased adsorption of MB on ZnO/montmorillonite resulted in faster photodegradation. The kinetics of the reaction obeyed the Langmuir-Hinshelwood model.
Journal of Ecological Engineering, 2021
The increasing growth of the textile industry does not only provide benefits in the economic sector but also has the potential to damage the environment, because it generates the dye wastewater which is hard to eliminate. Procion red is one of the synthetic textile dyes that is toxic to the aquatic environment and it needs to be processed properly. The photocatalytic method of processing dye wastewater is the most effective, because it can remove the harmful pollutants in the dye wastewater. This study aimed to prepare and characterize the ZnO-Zeolite nanocomposites for photocatalytic applications tested with a 50 mg/L procion red dye sample. The nanocomposites consisted of the ZnO semiconductors and synthetic zeolite adsorbents prepared by using the sol-gel method. The dye degradation test was carried out under the irradiation conditions with ultraviolet (UV) lamp. Apart from the ZnO-Zeolite nanocomposite, testing was also carried out with the synthetic zeolite and ZnO. The results...
Photocatalytic degradation of Methylene Blue using ZnO nano-particles
TiO 2-zeolite photocatalyst has been prepared by impregnation of TiO 2 onto acid-activated natural zeolite. The XRD data confirmed that natural zeolite used in this work is predominated with mordenite and clinoptilolite types, whereas anatase type can be attributed to TiO 2. The highest performance of TiO 2-zeolite, which is indicated by the surface area of 13.304 m 2 /g and band gap energy of 3.15 eV, is obtained when 10 mmol of TiO 2 is impregnated onto the zeolite. The ability of this photocatalyst is evaluated by examining degradation of methylene blue (MB) in the presence of UV source. The effects of MB concentration, pH and UV irradiation time on the degradation are studied in a batch reactor. It is interesting since the addition of H 2 O 2 can improve the degradation efficiency of MB. The optimum result is achieved at pH 11, duration of UV irradiation of 50 min, showing degradation amount of 98.25%. Surprisingly, the chemical oxygen demand (COD) in the degraded MB aqueous solution can be reduced about 77.9%, exhibiting the improvement of water quality. No loss of the activity of the degradation efficiency after reusability of this TiO 2-zeolite photocatalyst for at least 4 times.
Room Temperature Synthesis of Nanostructured ZnO: Active Visible Photocatalyst in the Degradation of Methylene Blue, 2021
Nanostructured ZnO was prepared using a facile solution-phase method at room temperature without need to calcination. Oxidation of zinc sulfate by sodium hypochlorite in the presence of polyethylene glycol (PEG) and sodium hydroxide (NaOH) gave pure nanostructured zinc oxide (ZnO-NPs). The structure and physicochemical properties of the material were determined by X-ray powder diffraction (XRD), Fourier-transform infrared spectroscopy (IR), Energy Dispersive X-ray Spectroscopy (EDS), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), UV-Vis diffuse reflectance and their optical Properties. ZnO particles were successfully distributed in two-dimensional sheet with a nanometric thickness and a random distribution. The activity was evaluated for photocatalytic degradation of methylene blue (MB) by a study of experimental conditions such as the effect of the mass of the catalyst, the effect of the initial concentration of the dye and the effect of the volume of the oxidizing agent. The kinetics of the reaction follow a pseudo-first order.
Facile synthesis of ZnO nanoparticles for the photocatalytic degradation of methylene blue
Journal of Sol-Gel Science and Technology, 2017
ZnO nanoparticle photocatalysts with a grain size range of 20-100 nm were prepared via a simple sol-gel method and characterized by X-ray powder diffractometry, scanning electron microscopy, gas adsorption, photoluminescence, UV-visible diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. As-synthesized ZnO samples were highly crystallized with hexagonal wurtzite structure, and the grain size was between 20 and 100 nm and increased with the annealing temperature. It was found that the band gap of ZnO nanoparticles narrowed to visible light region, i.e.,~2.69 eV, which increased with the calcining temperature. The sample with a high concentration of oxygen vacancy exhibits excellent photocatalytic activity toward methylene blue (MB) degradation under solar light irradiation, at which the highest photodegradation with a react constant k value of 0.12 min −1 was achieved. In addition, MB solution was decomposed within 30 min, and after 9 cycles, the catalyst maintains more than 95% photodegradation. Moreover, the intermediate process experiment demonstrated that •O 2 − and h + are the main active intermediate species during the photocatalytic processes.
Acta Polytechnica
In this paper, the photocatalytic degradation of procion red dye, one of the most frequently used dyes in the textile industry, was studied. The objective of the research is to study the ZnO-Zeolite nanocomposite application to degrade procion red dye by using different irradiation sources. The adsorption isotherm was also investigated. The ZnO-Zeolite nanocomposite was prepared by a sol-gel process. Photodegradation test was applied under the sunlight irradiation, ultraviolet (UV) lamp, and in a darkroom. The dye degradation was also examined by the synthetic zeolite and ZnO for a comparison. Another objective of this study is to analyse the appropriate adsorption isotherm to describe the degradation process of procion red dye by using ZnO-Zeolite nanocomposite. The adsorption ability of the nanocomposite was described by Langmuir and Freundlich isotherms. The adsorption of the nanocomposite was reported to depend on the degradation time. The highest photodegradation result of 98.2...
Journal of Water and Environmental Nanotechnology, 2019
ZnO and 2%Fe-ZnO nanomaterials were prepared by using a low-cost sol-gel method. The synthesized nanomaterials were characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX). The XRD and SEM studies reveal that the synthesized nanomaterials have a hexagonal wurtzite structure with average crystalline size ~ 22-23 nm. EDX analysis confirmed the composition and purity of synthesized nanomaterial. The photocatalytic activity of synthesized nanomaterials was monitored using the spectrophotometric method. Also, the photocatalytic removal of methylene blue (MB) dye from its aqueous solution by using ZnO and 2%Fe-ZnO nanopowder under UV light irradiation was studied. The effect of various parameters such as pH of dye solution, dye concentration, contact time and catalyst dose were investigated. Results of the current study demonstrated that, the maximum degradation using ZnO was 86 % and that for 2%Fe-ZnO was 92 % (under the optimum condition initial dye concentration=10 mg/L and pH =2). This study showed that 2%Fe-ZnO is a promising and better photocatalysts than ZnO.