Optimizing Zeolitic Catalysis for Environmental Remediation

Kowenje, Chrispin O.; Osewe, Elly T

doi:10.1002/9781118998939.ch12

Cited by 2 publications

(3 citation statements)

References 19 publications

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“…5, the 3D zeolites (FAU and ZSM-5) clearly show relatively higher malathion degradation with half-lives between 6 to 28 h. The 2D ferrierite has an intermediate half-life of ca. 29 h, while the 1D mordenite presents t ½ between 30 and 32.5 h. According to [24], the channel dimensions of the zeolites strongly affect molecule removal. Besides size exclusion effects, molecules that do fit in the zeolitic channels, smaller molecules are removed more effectively when they fitted tightly within the channels, because of larger van der Waals interactions.…”

Section: Concentration Of Malathion As a Function Of The Time In Water Treated With The Zeolitesmentioning

confidence: 99%

“…This enhanced degradation means that faujasite catalysis is highly favored in such conditions. Besides, the generation of alkaline media of the zeolite suspensions, the zeolites could also nd adsorption properties [24]. Thus, these factors combined contributed to the hastened malathion dissipation rate.…”

Section: Concentration Of Malathion As a Function Of The Time In Water Treated With The Zeolites The Initial Malathion Concentration Was mentioning

confidence: 99%

“…Micropores structure dimensionality in zeolites (D), whether 1D, 2D, or 3D (Table the rate of molecule removal in the treatment media [24]. Fig.…”

Section: Of Malathionmentioning

confidence: 99%

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Effects of Different Types of Zeolites on the Degradation Kinetics of Malathion Pesticide in Water

Osewe

Shikuku

Pereira

et al. 2021

CSIJ

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The study examined the effects of selected types of zeolites as an environmentally benign and friendly way to degrade, S-1, 2-bis (ethoxycarbonyl) ethyl O, O-dimethylphosphorodithioate (malathion), used as a model pesticide, from river water. The effect of the size of zeolite channels and dimensionality (such as 1D, 2D, and 3D), Si/Al ratio, and operating pH were studied to find a suitable type of zeolite and conditions to optimize the pesticide degradation. Mordenite (MOR (1D): Si/Al=6.83, and Si/Al=10.72), ferrierite (FER (2D): Si/Al=10.71), ZSM-5 (MFI (3D): Si/Al=6.83 and Si/Al=10.72) and USY (FAU (3D): Si/Al=2.77) zeolites were individually mixed with a water sample collected from Monjolinho River in São Carlos (SP), Brazil and the degradation trend studied. The results showed that all the zeolites accelerated the degradation of malathion. Nevertheless, lower zeolite Si/Al ratio and larger 3D channels or cavities had a positive influence on the degradation rate. The FAU zeolite presented the stronger degradation of the malathion with a half-life of 16.5 followed by ZSM-5 with 24.8, ferrierite with 29.7, and finally mordenite with 30.3 hours.

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Section: Concentration Of Malathion As a Function Of The Time In Water Treated With The Zeolitesmentioning

confidence: 99%

Section: Concentration Of Malathion As a Function Of The Time In Water Treated With The Zeolites The Initial Malathion Concentration Was mentioning

confidence: 99%

See 1 more Smart Citation

Effects of Different Types of Zeolites on the Degradation Kinetics of Malathion Pesticide in Water

Osewe

Shikuku

Pereira

et al. 2021

CSIJ

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Surfactant‐Templated Zeolites: From Thermodynamics to Direct Observation

Mendoza-Castro

Serrano

Linares

et al. 2020

Adv Materials Inter

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Surfactant‐templating is a versatile method to introduce tailored intracrystalline mesoporosity in zeolites. This method has been proven to be extremely effective to finely control both the amount of mesoporosity and the size of their mesopores, while maintaining the main features of the original zeolite, such as crystallinity, acidity, and hydrothermal stability. By building on the knowledge generated during the last 30 years in the field of amorphous mesoporous materials, the surfactant‐templating method has been successfully applied to develop intracrystalline mesoporosity into a variety of zeolite structures including FAU, BEA, MOR, LTL, and MFI. The improvement in both the textural and diffusional properties of the zeolite results in excellent catalytic performances in different industrially relevant processes, ranging from fluid catalytic cracking to the synthesis of active pharmaceutical ingredients. As a result of the excellent catalytic performances shown by the surfactant‐templated mesoporous Y zeolite, this is currently being used in several refineries, being the first industrial and large‐scale application of hierarchical zeolites. In this progress report, the literature regarding the surfactant‐templating method in zeolites is critically reviewed.

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Optimizing Zeolitic Catalysis for Environmental Remediation

Cited by 2 publications

References 19 publications

Effects of Different Types of Zeolites on the Degradation Kinetics of Malathion Pesticide in Water

Effects of Different Types of Zeolites on the Degradation Kinetics of Malathion Pesticide in Water

Surfactant‐Templated Zeolites: From Thermodynamics to Direct Observation

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