Achieving Dual-Functionality by Surface Coating of Zeolite with Stearic Acid: Combining Breathability and Odor Control Properties in Polyethylene/Zeolite Composite Films

Söylemez, Celal; Türkmen, İlker; Özen, İlhan

doi:10.1007/s13233-020-8154-5

Cited by 3 publications

(5 citation statements)

References 19 publications

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“…Regarding the selection of the zeolites, to be effective as adsorbents it is essential to consider their chemical affinity with the substances that should be adsorbed [19][20][21][22][23][24][25][27][28][29]33], as well as the dimensions of these latter with respect to the zeolites' pore size. In particular, it was reported in the literature [19] that excellent adsorbent performances can be obtained if the ratio between the zeolite pore size (D PORE ) and the kinetic molecular diameter of VOCs (D VOC ) is in the range 1.7 < D PORE /D VOC < 3.…”

Section: Main Characteristics Of the Recycled Plastics And Zeolitesmentioning

confidence: 99%

“…Another very promising deodorization technique concerns the adsorption of VOCs by materials with a porous structure [19][20][21][22][23][24][25][26][27][28]. The main parameters that control this process are the adsorbent's specific surface area, the pore structure and the adsorbent/adsorbate affinity.…”

Section: Introductionmentioning

confidence: 99%

“…The effectiveness of several porous adsorbents, such as active charcoal as well as zeolite, towards many volatile compounds, had been widely demonstrated in the cases of fluid streams flowing through beds made of these adsorbents' particles [19,[21][22][23][24][25][27][28][29]. On the contrary, the assessment of the zeolites' effectiveness as VOC adsorbents during the polymer extrusion process [16,26,27,30,31], thus at completely different boundary conditions (high temperatures and short contact times), needs more extensive investigations.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Melt Compounding with Zeolites as an Effective Deodorization Strategy for Mixed Plastic Wastes and Comparison with Degassing

et al. 2023

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The emission of off-odors from mechanically recycled plastics severely limits their re-introduction into the market for the production of new objects, for the same use or even for less demanding applications, thus hindering the implementation of an effective circular economy for plastics. The addition of adsorbing agents during the extrusion of polymers represents one of the most promising strategy to reduce the odorous emissions of plastics, due to its characteristics of cost-effectiveness, flexibility and low energy consumption. The novelty of this work lies in the assessment of zeolites as VOC adsorbents during the extrusion of recycled plastics. They appear more suitable than other types of adsorbents, due to their ability to capture and “hold” the adsorbed substances at the high temperatures of the extrusion process. Moreover, the effectiveness of this deodorization strategy was compared with the traditional degassing technique. Two types of mixed polyolefin wastes, coming from completely different collection and recycling processes, were tested: Fil-S (Film-Small), deriving from post-consumer flexible films of small size, and PW (pulper waste), which is the residual plastic waste obtained from the paper recycling process. The melt compounding of the recycled materials with two micrometric zeolites (zeolite 13X and Z310) resulted as more effective in the off-odors removal with respect to degassing. In particular, the highest reduction (−45%) of the Average Odor Intensity (AOI) was measured for both PW/Z310 and Fil-S/13X systems at 4 wt% of the zeolites’ amount, compared with the corresponding untreated recyclates. Finally, by combining degassing and melt compounding with zeolites, the best result was obtained for the composite Fil-S/13X, whose Average Odor Intensity resulted as quite close (+22%) to the one of the virgin LDPE.

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Section: Main Characteristics Of the Recycled Plastics And Zeolitesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of Melt Compounding with Zeolites as an Effective Deodorization Strategy for Mixed Plastic Wastes and Comparison with Degassing

et al. 2023

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“…Membrane materials include an inflatable membrane structure; these membranes can create a mass transfer barrier against volatile gases on the soil surface [ 11 ]. Some adsorbents, such as porous materials, have abundant adsorption sites that provide the ability to contain gas molecules [ 12 ]. Although these two materials are efficient in terms of VOCs control, they still lack applications in contaminated soil plots.…”

Section: Introductionmentioning

confidence: 99%

SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

Yu,

Xuan

2024

Toxics

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Volatile organic compounds (VOCs) are prevalent soil contaminants. During the ex situ soil remediation process, VOCs may overflow from the soil and cause gas to diffuse into the atmosphere. Moreover, some VOCs, such as trichloromethane, are categorized by the EPA as emerging contaminants, imparting toxicity to organs, and the endocrine and immune systems, and posing a huge threat to human health and the environment. To reduce VOCs’ emissions from contaminated soil, aqueous foam suppression is a prospective method that provides a durable mass transfer barrier for VOCs, and it has been widely used in odor control. Based on an aqueous foam substrate, in order to enhance the foam’s stability and efficiency of suppression, SiO2–TiO2-modified nanoparticles have been used as stabilizing agents to improve the mechanical strength of liquid film. The nanoparticles are endowed with the ability to photocatalyze after the introduction of titanium dioxide. From SEM imaging, IR, and a series of morphological characterization experiments, the dispersibility of the SiO2–TiO2-modified nanoparticles was significantly improved under the polar solvent, which, in turn, increased the foam duration. The foam dynamic analysis experiments showed that the foam liquid half-life was increased by 4.08 h, and the volume half-life was increased by 4.44 h after adding the novel synthesized nanoparticles to the bulk foam substrate. From the foam VOC suppression test, foam with modified nanoparticles was more efficient in terms of VOCs’ suppression, in contrast with its nanoparticle-free counterparts, due to the longer retention time. Moreover, in a bench-scale experiment, the SiO2–TiO2 nanoparticles foam worked against dichloroethane, n–hexane, and toluene for almost 12 h, with a 90% suppression rate, under UV irradiation, which was 2~6 h longer than that of UV-free SiO2–TiO2 nanoparticles, the KH–570-modified nanosilica foam, and the nanoparticle-free bulk foam. XPS and XRD results indicate that in SiO2–TiO2 nanoparticles, the proportion of titanium valence was changed, providing more oxygen vacancies compared to raw titanium dioxides.

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“…Recently, various 2D materials, including zeolites, − metal–organic frameworks (MOFs), − graphene, − MXenes, − h-BN, − TMDs, − and other nanosheet materials, − are widely used for high separation performance membranes due to their 2D layered structure, which makes them easy to prepare and modify to separate different molecules. − However, conventional polymer films cannot exist stably in complex environments, such as high temperatures, strong acids/bases, organic solvents, or corrosive environments . While the porous ceramic membrane overcomes the above shortcomings, the preparation process is complicated, the price is very expensive, and the brittleness is large, as it is easily broken during the pressure driving process .…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Graphene Oxide Membranes for Nanofiltration

Yang

Xiao

Shen

et al. 2022

ACS Appl. Nano Mater.

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Advanced membrane separation technology plays an important role in achieving excellent water treatment, which can help solve the freshwater crisis. However, there remains a trade-off between membrane permeability and selectivity. An emerging candidate to address this issue is graphene oxide (GO), a two-dimensional (2D) laminated graphene derivative with abundant oxygen functional groups. Furthermore, the transport channels of GO-based membranes can be artificially modified and manipulated, exhibiting great promise for GO in the field of water purification and molecular separation. This review comprehensively summarizes the research advances on 2D GO-based membranes for high-performance nanofiltration (NF). It begins with an elaboration on the preparation methods of GO-based membranes, followed by a detailed summary of the chemical modification and physical manipulation of transport channels. Then we reviewed the current research progress of theoretical calculation and molecular dynamics simulation. Also, the high NF performance of GO-based membranes is presented. Finally, the remaining challenges and future prospects in order to develop advances in membrane technology are provided.

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Achieving Dual-Functionality by Surface Coating of Zeolite with Stearic Acid: Combining Breathability and Odor Control Properties in Polyethylene/Zeolite Composite Films

Cited by 3 publications

References 19 publications

Assessment of Melt Compounding with Zeolites as an Effective Deodorization Strategy for Mixed Plastic Wastes and Comparison with Degassing

Assessment of Melt Compounding with Zeolites as an Effective Deodorization Strategy for Mixed Plastic Wastes and Comparison with Degassing

SiO2–TiO2 Nanoparticle Aqueous Foam for Volatile Organic Compounds’ Suppression

Recent Advances in Graphene Oxide Membranes for Nanofiltration

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