Heterogeneous catalytic ozonation of clofibric acid using Ce/MCM-48: Preparation, reaction mechanism, comparison with Ce/MCM-41

Li, Shangyi; Tang, Yiming; Chen, Weirui; Hu, Zhe; Li, Xukai; Li, Laisheng

doi:10.1016/j.jcis.2017.05.042

Cited by 39 publications

(16 citation statements)

References 48 publications

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“…They found that the active sites were surface protonated hydroxyl groups from the influence of initial pH and Ce/MCM-48 catalysts generated more hydroxyl radicals than Ce/MCM-41. Moreover, they investigated the degradation pathway of CA at different pH [131] (Figure 12). Roshani et al [132] studied the catalytic ozonation of benzotriazole (BTZ) using Mn/Al 2 O 3 , Cu/Al 2 O 3 and Mn-Cu/Al 2 O 3 as catalyst, respectively, they found that a higher level of mineralization of BTZ rather than in uncatalyzed ozonation over a wide range of pH values.…”

Section: Metal or Metal Oxides On Supportsmentioning

confidence: 99%

“…Roshani et al [132] studied the catalytic ozonation of benzotriazole (BTZ) using Mn/Al 2 O 3 , Cu/Al 2 O 3 and Mn-Cu/Al 2 O 3 as catalyst, respectively, they found that a higher level of mineralization of BTZ rather than in uncatalyzed ozonation over a wide range of pH values. In deionized water, the catalytic activity followed the order of Cu Li et al [131] synthesized mesoporous MCM-48 and Ce loaded MCM-48 (Ce/MCM-48) to improve the ozonation effectiveness of clofibric acid in aqueous solution. They compared the catalytic capability among Ce/MCM-48, Ce/MCM-41 and MCM-48 by catalytic ozonation of Total Organic Carbon (TOC) and found that the removal efficiency followed the order of Ce/MCM-48 (64%) > Ce/MCM-41 (54%) > MCM-48 (24%) > single ozonation (23%).…”

Section: Metal or Metal Oxides On Supportsmentioning

confidence: 99%

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Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

et al. 2019

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Catalytic ozonation is believed to belong to advanced oxidation processes (AOPs). Over the past decades, heterogeneous catalytic ozonation has received remarkable attention as an effective process for the degradation of refractory organics in wastewater, which can overcome some disadvantages of ozonation alone. Metal oxides, metals, and metal oxides supported on oxides, minerals modified with metals, and carbon materials are widely used as catalysts in heterogeneous catalytic ozonation processes due to their excellent catalytic ability. An understanding of the application can provide theoretical support for selecting suitable catalysts aimed at different kinds of wastewater to obtain higher pollutant removal efficiency. Therefore, the main objective of this review article is to provide a summary of the accomplishments concerning catalytic ozonation to point to the major directions for choosing the catalysts in catalytic ozonation in the future.

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Section: Metal or Metal Oxides On Supportsmentioning

confidence: 99%

Section: Metal or Metal Oxides On Supportsmentioning

confidence: 99%

Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

et al. 2019

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“…Development of efficient technologies for the removal of these recalcitrant organic chemicals (ROCs) is needed (Güm and Akbal, 2017; Nawaz et al, 2017). The application of catalytic ozonation process (COP) has been investigated for the development of an efficient method for the removal of ROCs from water (Li et al, 2017). The catalysts in the process facilitate the decomposition of ozone into more active species such as free radicals, and/or for the adsorption of chemicals that can react with dissolved ozone (Dong et al, 2008; Chen et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Catalytic Ozonation of Recalcitrant Organic Chemicals in Water Using Vanadium Oxides Loaded ZSM-5 Zeolites

Wang

Yoza

et al. 2019

Front. Chem.

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The discharge of wastewater having recalcitrant chemical compositions can have significant and adverse environmental effects. The present study investigates the application of a catalytic ozonation treatment for the removal of recalcitrant organic chemicals (ROCs) from the water. Novel catalytic materials using vanadium (V) oxides deposited onto the surface of NaZSM-5 zeolites (V/ZSM) were found to be highly efficient for this purpose. The highly-dispersed V oxides (V 4+ and V 5+ ) and Si-OH-Al framework structures were determined to promote the surface reaction and generation of hydroxyl radicals. The constructed V1/ZSM 450 (0.7 wt% of V loading and 450°C of calcination) exhibited the highest activity among the developed catalyst compositions. The V1/ZSM 450 -COP increased the mineralization rate of nitrobenzene and benzoic acid by 50 and 41% in comparison to single ozonation. This study demonstrates the enhanced potential of V/ZSM catalysts used with catalytic ozonation process (COP) for the treatment of chemical wastewaters.

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“…The ZSM‐5 microporous structure is consistent with these results. When the CTAB content increased to about 5%, an apparent type IV N 2 adsorption–desorption isotherm curve with a hysteresis loop was observed, which is characteristic of mesoporous MCM‐41 molecular sieves . The average pore size was 3.8 nm and the specific surface area was about 318 m 2 /g.…”

Section: Resultsmentioning

confidence: 97%

Effect of the template on the hydrothermal synthesis of mixed molecular sieves for methanol dehydration

Zhang

2018

Env Prog and Sustain Energy

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In this work, microporous–mesoporous H‐ZSM‐5/MCM‐41 mixed molecular sieves catalyst was successfully synthesized using a hydrothermal synthesis technology. Mesoporous MCM‐41 sieves were obtained by partial alkali treatment of microporous H‐ZSM‐5. The effect of the amount of template (i.e., cetyltrimethyl ammonium bromide, CTAB) on the preparation process of catalyst was investigated. The catalyst was characterized using X‐ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and N2 adsorption–desorption. Methanol dehydration to dimethyl ether was selected to evaluate the catalytic performance of H‐ZSM‐5/MCM‐41. The content of mesoporous MCM‐41 in the mixed molecular sieve catalyst as well as its particle and pore sizes increased with the amount of CTAB, thereby enhancing the catalytic activity of the final material while keeping constant the microporous ZSM‐5 loadings. Thus, the amount of mesoporous MCM‐41 in the mixed molecular sieve catalyst reached a maximum at a CTAB loading of 10%, with the resultant material showing a maximum specific surface area of 335 m2/g and a mean pore size of 3.8 nm. Additionally, this material showed optimum catalytic activity (84% methanol conversion at 220°C). © 2018 American Institute of Chemical Engineers Environ Prog, 37: 1901–1907, 2018

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Heterogeneous catalytic ozonation of clofibric acid using Ce/MCM-48: Preparation, reaction mechanism, comparison with Ce/MCM-41

Cited by 39 publications

References 48 publications

Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

Application of Heterogeneous Catalytic Ozonation for Refractory Organics in Wastewater

Catalytic Ozonation of Recalcitrant Organic Chemicals in Water Using Vanadium Oxides Loaded ZSM-5 Zeolites

Effect of the template on the hydrothermal synthesis of mixed molecular sieves for methanol dehydration

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