Abstract:Mechanical energy harvesting by piezoelectric materials to drive catalysis reactions received extensive attention for environmental remediation. In this work, SbSI/Sb2S3 nanocomposites were synthesized as a catalyst. ZrO2 balls were used as an alternative mechanical force to ultrasonic for stimulating the piezocatalyst for the first time. The kinetics and thermodynamics of the piezo degradation of methylene blue (MB) were studied deeply. Besides the effect of the type of mechanical force, the number of ZrO2 ba… Show more
“…The kinetics of piezo-desulfurization and characteristic constants of sulfur removal by piezocatalyst can be studied through kinetic measurements using pseudo-first-order, pseudo-second-order, and intra-particle diffusion. The Lagergren pseudo-first-order model is given as follows 26 , 40 : Figure 11 ( a ) piezo-desulfurization rates over time for 500 ppm TP in different temperatures in presence of d2 as catalyst, ( b ) piezo-desulfurization rates over time for 500 ppm TP without using catalyst, ( c ) Pseudo-first-order and pseudo-second-order fitting for piezo-removal of TP in different temperatures, ( d ) Activation energy for removal of TP by piezo catalyst based on Arrhenius equation. …”
Section: Resultsmentioning
confidence: 99%
“…Pseudo-second-order kinetic model assumes that the rate of degradation is second order 26 , 41 , 42 . where k 2 is the pseudo-second-order rate constant.…”
In order to advance desulfurization technology, a new method for excellent oxidative desulfurization of fuel at room temperature will be of paramount importance. As a novel desulfurization method, we developed piezo-catalysts that do not require adding any oxidants and can be performed at room temperature. A microwave method was used to prepare CeO2/Ce2O3/NiOx nanocomposites. Model and real fuel desulfurization rates were examined as a function of synthesis parameters, such as microwave power and time, and operation conditions, such as pH and ultrasonic power. The results showed that CeO2/Ce2O3/NiOx nanocomposites demonstrated outstanding piezo-desulfurization at room temperature for both model and real fuels. Furthermore, CeO2/Ce2O3/NiOx nanocomposites exhibited remarkable reusability, maintaining 79% of their piezo-catalytic activity even after 17 repetitions for desulfurization of real fuel. An investigation of the mechanism of sulfur oxidation revealed that superoxide radicals and holes played a major role. Additionally, the kinetic study revealed that sulfur removal by piezo-catalyst follows a second-order reaction kinetic model.
“…The kinetics of piezo-desulfurization and characteristic constants of sulfur removal by piezocatalyst can be studied through kinetic measurements using pseudo-first-order, pseudo-second-order, and intra-particle diffusion. The Lagergren pseudo-first-order model is given as follows 26 , 40 : Figure 11 ( a ) piezo-desulfurization rates over time for 500 ppm TP in different temperatures in presence of d2 as catalyst, ( b ) piezo-desulfurization rates over time for 500 ppm TP without using catalyst, ( c ) Pseudo-first-order and pseudo-second-order fitting for piezo-removal of TP in different temperatures, ( d ) Activation energy for removal of TP by piezo catalyst based on Arrhenius equation. …”
Section: Resultsmentioning
confidence: 99%
“…Pseudo-second-order kinetic model assumes that the rate of degradation is second order 26 , 41 , 42 . where k 2 is the pseudo-second-order rate constant.…”
In order to advance desulfurization technology, a new method for excellent oxidative desulfurization of fuel at room temperature will be of paramount importance. As a novel desulfurization method, we developed piezo-catalysts that do not require adding any oxidants and can be performed at room temperature. A microwave method was used to prepare CeO2/Ce2O3/NiOx nanocomposites. Model and real fuel desulfurization rates were examined as a function of synthesis parameters, such as microwave power and time, and operation conditions, such as pH and ultrasonic power. The results showed that CeO2/Ce2O3/NiOx nanocomposites demonstrated outstanding piezo-desulfurization at room temperature for both model and real fuels. Furthermore, CeO2/Ce2O3/NiOx nanocomposites exhibited remarkable reusability, maintaining 79% of their piezo-catalytic activity even after 17 repetitions for desulfurization of real fuel. An investigation of the mechanism of sulfur oxidation revealed that superoxide radicals and holes played a major role. Additionally, the kinetic study revealed that sulfur removal by piezo-catalyst follows a second-order reaction kinetic model.
“…Further, these electrons react with the MB molecules, leading to the generation of reactive oxygen species (ROS), such as hydroxyl radicals (•OH). These ROS are highly reactive and oxidize the MB molecules, leading to their degradation into smaller molecules . The combination of high-energy electrons and ROS ensures that all MB molecules are degraded, leading to a 100% degradation efficiency.…”
In this work, we report a facile fabrication of an interface-induced piezoelectric PVDF-ZnSnO 3 -MoS 2 (PZM) device for the rapid degradation of organic dyes, namely, crystal violet (CV) and methylene blue (MB) in wastewater. The piezocatalyst composite mold is fabricated with PVDF as a binder matrix and ZnSnO 3 /MoS 2 as piezoelectric cocatalysts to increase the selectivity and efficiency of the device. SEM micrographs display the formation of aggregated nanoparticle structures with a large number of active sites for superior catalytic activity. The structural studies reveal the increase in the β-phase of PVDF with the increased concentration of ZnSnO 3 and MoS 2 nanoparticles in the PZM mold. The optimized composite mold displays the superior performance of both CV and MB with 100% degradation in 14 and 6 min, respectively. Further, the superior performance of alkaline pH solution with an ultrasonic power of 50 W and a weight percentage of 20% was optimized to achieve maximum catalytic efficiency, selectivity, and stability to minimize the environmental impact. The fabricated piezocatalyst is found to be efficient and reusable after 7 degradation studies displaying high repeatability. The approach presented in this work can inspire a new strategy for designing efficient and scalable piezocatalytic materials for sustainable wastewater treatment.
“…As the ultrasonic power increases, the temperature of the reaction will also rise. Our previous study showed that increasing temperature resulted in a decrease in decontamination yield because dye degradation by piezo is exothermic 43 .…”
The purpose of this study is to improve the efficiency of decontamination using BaSO4 as a piezocatalyst. Three techniques are employed in this study to enhance the piezocatalytic activity of BaSO4. The first method involves coupling BaSO4 with BaTiO3. The acid red 151 and acid blue 113 decontamination rates improved from 56.7% and 60.9% to 61.3% and 64.4%, respectively, as a result of this strategy. Additionally, the composite of BaSO4 and BaTiO3 was doped with copper, iron, sulfur, and nitrogen. By doping BaTiO3, acid red 151 and acid blue 113 achieved 86.7% and 89.2% efficiency, respectively. Finally, the nanostructures were modified with sucrose. These strategies improved degradation efficiency for acid red 151 and acid blue 113 to 92.9% and 93.3%, respectively. The reusability results showed that the piezo-catalytic activity of the m-S–BaSO4–BaTiO3 catalyst did not show a significant loss after five recycles for the degradation of AB113.
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