Surfactant-modified MFI-type nanozeolites: Super-adsorbents for nitrate removal from contaminated water

Hanache, Layla El; Sundermann, Lion; Lebeau, Bénédicte; Toufaily, Joumana; Hamieh, Tayssir; Daou, T. Jean

doi:10.1016/j.micromeso.2019.03.049

Cited by 40 publications

(28 citation statements)

References 47 publications

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“…while at high pressure, a type II and IV isotherm is observed showing the presence of interparticle mesoporosity. 31,49 These results show a significant increase in microporous volume for nanosponges due to the existence of secondary microporosity. Indeed, the total pore volume and BET surface area increase for hierarchical materials.…”

Section: Sorption Isothermsmentioning

confidence: 76%

Effect of zeolite morphology on charge separated states: ZSM-5-type nanocrystals, nanosheets and nanosponges

Duplouy

Moissette

Hureau

et al. 2020

Phys. Chem. Chem. Phys.

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Section: Sorption Isothermsmentioning

confidence: 76%

Effect of zeolite morphology on charge separated states: ZSM-5-type nanocrystals, nanosheets and nanosponges

Duplouy

Moissette

Hureau

et al. 2020

Phys. Chem. Chem. Phys.

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“…In this case, organic additives are added to the medium generally used for the zeolite synthesis, like organosilanes [ 24 ], organic surfactant agents (CTAB, etc) [ 25 ], or bifunctional organic agents. These can direct the synthesis of zeolites and inhibit crystal growth, creating nanosheets or nanosponges zeolite materials [ 26 , 27 , 28 , 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties

et al. 2021

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Hierarchical MOR-type zeolites were synthesized in the presence of hexadecyltrimethylammonium bromide (CTAB) as a porogen agent. XRD proved that the concentration of CTAB in the synthesis medium plays an essential role in forming pure hierarchical MOR-type material. Above a CTAB concentration of 0.04 mol·L−1, amorphous materials are observed. These hierarchical mordenite possess a higher porous volume compared to its counterpart conventional micrometer crystals. Nitrogen sorption showed the presence of mesoporosity for all mordenite samples synthesized in the presence of CTAB. The creation of mesopores due to the presence of CTAB in the synthesis medium does not occur at the expense of zeolite micropores. In addition, mesoporous volume and BET surface seem to increase upon the increase of CTAB concentration in the synthesis medium. The Si/Al ratio of the zeolite framework can be increased from 5.5 to 9.1 by halving the aluminum content present in the synthesis gel. These synthesized hierarchical MOR-type zeolites possess an improved catalytic activity for n-hexane cracking compared to large zeolite crystals obtained in the absence of CTAB.

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“…Adsorption is one other method that is simple and economically efficient for removing nitrate ions from water, due to its ease of handling, availability of a wide range of adsorbents, comfortable repair and maintenance (El Mouzdahir et al, 2007;Moreira et al, 2017). During the last years, many researchers have been directed to the development of various adsorbents for fast removal of nitrates (Satayeva et al 2018;Fan and Zhang 2018;Gouran-Orimi et al 2019;El Hanache et al 2019). Activated carbon has been the extensively used material for the treatement of contaminated water because it possesses a high sorption capacity, and is characterized by a very high porosity which allows them to develop a large surface of contact with the external environment (Ghasemi et al 2016;Piai et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Optimizing the removal of nitrate by adsorption onto activated carbon using response surface methodology based on the central composite design

Taoufik

Elmchaouri

Korili

et al. 2020

Journal of Applied Water Engineering and Research

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This study sheds light on the adsorption process for the removal of nitrate ions from synthetic aqueous solutions. This contaminant pose a potential risk to the environment and can cause health effects including cancers and methemoglobinemia in infants. When the adsorption process is carried out, the effect by the several operating parameters such as initial nitrate concentration, pH, mass of activated carbon, and contact time becomes apparent. The essential process variables are optimized using response surface methodology (RSM) based on the central composite design (CCD) experiments. For this purpose 31 experimental results are required to determine the optimum conditions. The ANOVA results obtained from the RSM studies are analyzed using a second-degree polynomial equation. The study of the determination of contour plots shows the interactions among the variables of the adsorption system. The optimum conditions for the removal of nitrates is found to be: initial nitrate concentration = 15 mg/L; initial pH 4.0; mass of activated carbon= 25 mg, and contact time = 70 min. At these optimized conditions, the maximum removal of nitrates is found to be 96.59 %. The experimental values were in excellent accord with the predicted ones by the proposed RSM models. This indicates that the quadratic models can be effectively used to predict the removal efficiency of nitrate ions by adsorption process. These low-cost adsorption methods can be effectively adopted for the removal of nitrate ions from industrial effluents.

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Surfactant-modified MFI-type nanozeolites: Super-adsorbents for nitrate removal from contaminated water

Cited by 40 publications

References 47 publications

Effect of zeolite morphology on charge separated states: ZSM-5-type nanocrystals, nanosheets and nanosponges

Effect of zeolite morphology on charge separated states: ZSM-5-type nanocrystals, nanosheets and nanosponges

Synthesis of Hierarchical MOR-Type Zeolites with Improved Catalytic Properties

Optimizing the removal of nitrate by adsorption onto activated carbon using response surface methodology based on the central composite design

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