Plasma O2modifies the structure of synthetic zeolite-A to improve the removalof cadmium ions from aqueous solutions

Fahmy, Alaa; Elzaref, Ahmed S.; Youssef, H.; Shehata, Hassan; Wassel, Magdy A.; Friedrich, Jörg; Poncin-Epaillard, Fabienne; Debarnot, Dominique

doi:10.3906/kim-1808-14

Cited by 12 publications

(4 citation statements)

References 31 publications

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“…However, in the case of O 2 plasma, in addition to the surface activation of the PVC membrane, functionalization of the polymer is predicted to occur because of the chemically active nature of O 2 gas (Figures 2a and 2b). This must lead to consumption of the active sites on the PVC surface [32], and therefore reduction of active sites and hindrance of the grafting process ( Figure 2b). For that reason, Ar plasma was selected for the surface treatment in this study.…”

Section: Results and Discussion 21 Chemical Composition Of Membranesmentioning

confidence: 99%

Surface modification of polyvinyl chloride by polyacrylic acid graftas a polyelectrolyte membrane using Ar plasma

Fahmy¹,

Abu-Saied²,

Organ³

et al. 2019

Turk J Chem

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This work reports the synthesis and properties of a new membrane based on polyvinyl chloride (PVC) grafting with polyacrylic acid (PAA) using argon (Ar) plasma. The membranes of PVC were synthesized by solutioncasting method, where PAA was deposited as an ultrathin film onto PVC using dielectric barrier discharge at atmospheric pressure with Ar gas. The surface characteristics and chemical composition of the modified membranes were analyzed by water contact angle, scanning electron microscopy, and Fourier transform infrared spectroscopy. Moreover, the electrochemical properties of the membrane were investigated via ion exchange capacity for the purpose of using it as a polyelectrolyte membrane.

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Section: Results and Discussion 21 Chemical Composition Of Membranesmentioning

confidence: 99%

Surface modification of polyvinyl chloride by polyacrylic acid graftas a polyelectrolyte membrane using Ar plasma

Fahmy¹,

Abu-Saied²,

Organ³

et al. 2019

Turk J Chem

Self Cite

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“…Compared to the traditional thermal treatment method, non-thermal plasma is fast, clean, energy-saving, convenient, and relatively low-cost [18] despite improving the activity, life, and selectivity of materials [31]; therefore, it is viewed as an ideal treatment method. At present, the non-thermal plasma is generally applied for activating the adsorbents/catalysts or assisting the purification process for enhancing the removal efficiency of the VOCs or NO x .…”

Section: Application Of Non-thermal Plasma Over Zeolite-based Materialsmentioning

confidence: 99%

Application of Unconventional External-Field Treatments in Air Pollutants Removal over Zeolite-Based Adsorbents/Catalysts

Cheng,

Ren,

Yao

et al. 2023

Catalysts

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Zeolite-based materials are widely used as adsorbents and catalysts for purifying air pollutants like NOx and VOCs due to abundant pore structure, regular pore distribution, and numerous ion exchange sites. Thermal treatment is a necessary procedure for both removing impurities in pores and promoting the metal active dispersed evenly before the zeolite-based adsorbents/catalysts were applied for purifying the NOx/VOCs. Nevertheless, the conventional thermal field treatment (i.e., high-temperature calcination, high-temperature purging, etc.) takes large energy consumption. In contrast, unconventional external-field treatments such as non-thermal plasma and microwave show significant advantages of high efficiency, low energy consumption as well and low pollution, which were used to substitute the traditional thermal treatment in many fields. In this paper, the roles of non-thermal plasma or microwave in the adsorption/catalysis of the NOx/VOCs are reviewed from three aspects assisting activation of materials, cooperative catalysis process, and assisting zeolites synthesis. The reasons for unconventional treatments in improving textural properties, active sites, performance, etc. of zeolite-based materials were illuminated in detail. Moreover, the influences of various parameters (i.e., power, time, temperature, etc.) on the above aspects are elaborated. It is hoped that this review could provide some advanced guidance for the researchers to develop highly efficient materials.

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“…Electrical discharges in plasma above or in a liquid also initiate redox processes [ 31 ]. Therefore, plasma-based processes are generally considered to be combined with other AOPs, including ozonation, UV photolysis and pyrolysis [ 32 ]. They have the advantages of not requiring temperature and pressure and being energy saving and ecological, and therefore environmentally friendly [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

Removal of Pb(II), Cd(II) and Ni(II) Ions from Groundwater by Nonthermal Plasma

et al. 2022

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The removal of Pb(II), Cd(II) and Ni(II) ions from aqueous solutions by means of nonthermal plasma with a dielectric barrier discharge is investigated. Aqueous solutions with metal ion concentrations from 10 to 100 mg/dm3 in spring water were used. In the first stage, the optimization of the solution flow rate, generator modulation frequency and duty cycle was made in terms of the removal efficiency of the considered metals. The removal was then investigated as a function of the number of passes of the solution through the cold plasma reactor. The effect of the initial concentration of ions in the solution was studied. Techniques such as composite central design, least squares method and Fourier transform infrared spectroscopy were used. The physical and chemical parameters of the solutions, such as electrical conductivity, pH, temperature, concentration of metal ions and the content of other substances (e.g., total organic carbon), were measured, and the presence of microorganisms was also examined. It was found that each pass of the solution through the cold plasma reactor causes a decrease in the concentration of Cd(II) and Ni(II); the concentration of Pb(II) drops rapidly after one pass, but further passes do not improve its removal. The removal percentage was 88% for Cd(II) after six passes and 72% for Pb(II) after one pass, whereas 19% for Ni(II). The purification mechanism corresponds to the precipitation of metal ions due to the increasing pH of the solution after exposure to cold plasma.

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Plasma O2modifies the structure of synthetic zeolite-A to improve the removalof cadmium ions from aqueous solutions

Cited by 12 publications

References 31 publications

Surface modification of polyvinyl chloride by polyacrylic acid graftas a polyelectrolyte membrane using Ar plasma

Surface modification of polyvinyl chloride by polyacrylic acid graftas a polyelectrolyte membrane using Ar plasma

Application of Unconventional External-Field Treatments in Air Pollutants Removal over Zeolite-Based Adsorbents/Catalysts

Removal of Pb(II), Cd(II) and Ni(II) Ions from Groundwater by Nonthermal Plasma

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