Absorption Behavior of Graphene Nanoplates toward Oils and Organic Solvents in Contaminated Water

La, Duong Duc; Nguyen, Tuan Anh; Tung, Ngo Trinh; Ninh, Ha Duc; Thi, Hoai Phuong Nguyen; Nguyen, Tham Thi; Nguyen, Duy Anh; Dang, Trung Thanh; Rene, Eldon R.; Chang, Soon Woong; Thị, Hiền Trần; Nguyen, Dinh Duc

doi:10.3390/su11247228

Cited by 10 publications

(4 citation statements)

References 35 publications

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“…Dioctyl phthalate (DOP) is widely utilized as a plasticizer in the natural rubber formula. Additionally, DOP, as one of the organic compounds demonstrated good bonding with the graphene surface via π-π interaction [36,37]. Thus, DOP was selected as one of the ideal organic compounds to modify the graphene's surface to improve the dispersibility of GNPs in the synthetic rubber matrix.…”

Section: Resultsmentioning

confidence: 99%

Dioctyl Phthalate-Modified Graphene Nanoplatelets: An Effective Additive for Enhanced Mechanical Properties of Natural Rubber

et al. 2022

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Graphene has been extensively considered an ideal additive to improve the mechanical properties of many composite materials, including rubbers, because of its novel strength, high surface area, and remarkable thermal and electron conductivity. However, the pristine graphene shows low dispersibility in the rubber matrix resulting in only slightly enhanced mechanical properties of the rubber composite. In this work, graphene nanoplatelets (GNPs) were modified with dioctyl phthalate (DOP) to improve the dispersibility of the graphene in the natural rubber (NR). The distribution of the DOP-modified GNPs in the NR matrix was investigated using scanning electron microscopy, X-ray diffraction, and Raman spectroscopy. The effect of the modified GNPs’ contents on the mechanical properties of the GNPs/NR composite was studied in detail. The results showed that the abrasion resistance of the graphene-reinforced rubber composite significantly improved by 10 times compared to that of the rubber without graphene (from 0.3 to 0.03 g/cycle without and with addition of the 0.3 phr modified GNPs). The addition of the modified GNPs also improved the shear and tensile strength of the rubber composite. The tensile strength and shear strength of the NR/GNPs composite with a GNPs loading of 0.3 phr were determined to be 23.63 MPa and 42.69 N/mm, respectively. Even the presence of the graphene reduced the other mechanical properties such as Shore hardness, elongation at break, and residual elongation; however, these reductions were negligible, which still makes the modified GNPs significant as an effective additive for the natural rubber in applications requiring high abrasion resistance.

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Section: Resultsmentioning

confidence: 99%

Dioctyl Phthalate-Modified Graphene Nanoplatelets: An Effective Additive for Enhanced Mechanical Properties of Natural Rubber

et al. 2022

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“…Thus, it is necessary to find effective and practical solutions to prevent the intrusion of PMs and E. coli into the human body. Many materials, such as metal-organic frameworks, carbon-based materials, and non-woven textiles have been employed to effectively filter PMs from polluted air [13][14][15][16]. Non-woven textiles have been widely used in many practical applications for PM filtering, such as protective masks and in-line filtering membranes [17,18].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Antibacterial Ag/Graphene-Integrated Non-woven Polypropylene Textile for Air Pollutant Filtering

La¹,

Pham

Lai

et al. 2023

Waste Biomass Valor

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Air pollution and infectious diseases (such as the COVID-19 pandemic) have attracted considerable attention from governments and scientists worldwide to find the best solutions to address these issues. In this study, a new simultaneous antibacterial and particulate matter (PM) filtering Ag/graphene-integrated non-woven polypropylene textile was fabricated by simply immersing the textile into a Ag/graphene-containing solution. The Ag/graphene nanocomposite was prepared by reducing Ag ions on the surface of graphene nanoplatelets (GNPs) using the leaf extract. The prepared Ag/graphene textile was characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), Energy Dispersive X-ray (EDX), and contact angle measurements. The results showed excellent integration of the Ag/GNP nanocomposite into the non-woven polypropylene textile matrix. The prepared textile exhibited superhydrophobicity with a contact angle of 152°. The maximum PM removal percentage of the Ag/GNP-integrated textile was determined to be 98.5% at an Ag/GNP content of 1.5% w/w and a silicon adhesive of 1% w/w. The Ag/GNP textile exhibited high antibacterial activity toward Escherichia coli with no sign of bacteria on the surface. Remarkably, the as-prepared Ag/GNP textile was highly durable and stable and could be reused many times after washing. Graphical Abstract

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“…Nanomaterials have been the subject of much research in recent years, and this is motivated by their superior mechanical properties and new applications in nanoscience, nanomanufacturing, and smart nanostructure technologies. There are different nanostructures among which graphene sheets have been of high interest to researchers due to a wide range of applications [1][2][3][4][5][6]. However, there are always complications in the design, manufacturing, and health monitoring of such structures on this scale.…”

Section: Introductionmentioning

confidence: 99%

Wave Analysis of Thick Rectangular Graphene Sheets: Thickness and Small-Scale Effects on Natural and Bifurcation Frequencies

2022

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Free vibration and wave analysis of thick rectangular graphene are studied by employing the wave propagation method. To consider small-scale effects and thickness of a plate in nanoscales, equations of motions are represented by the Eringen nonlocal theory coupled with the Mindlin plate theory of thick plates. To solve the governing equations of motion with the wave propagation technique, propagation and reflection matrices are derived. These matrices are combined to obtain exact natural frequencies of graphene sheets for all six possible boundary conditions. To check the accuracy and reliability of the method, natural frequencies are compared with the results of the literature, and excellent agreement is observed. Additionally, wave analysis of the graphene sheet is performed and different types of waves in the graphene sheet are captured. Deriving the dispersion relation of the graphene sheet, bifurcation frequencies (cut-off and escape frequencies) are analytically found. Finally, the effects of graphene sheet thickness and nonlocal parameter on the natural frequencies and bifurcation frequencies are investigated. It is observed that natural frequencies are highly dependent on the graphene sheet’s thickness and nonlocal parameter. More importantly, the number and order of bifurcation frequencies depend on these two parameters as well. Our findings are valuable for the sustainable design and fabrication of graphene-based sensors, in which structural health monitoring of embedded graphene sheets is of great importance.

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Absorption Behavior of Graphene Nanoplates toward Oils and Organic Solvents in Contaminated Water

Cited by 10 publications

References 35 publications

Dioctyl Phthalate-Modified Graphene Nanoplatelets: An Effective Additive for Enhanced Mechanical Properties of Natural Rubber

Dioctyl Phthalate-Modified Graphene Nanoplatelets: An Effective Additive for Enhanced Mechanical Properties of Natural Rubber

Fabrication of Antibacterial Ag/Graphene-Integrated Non-woven Polypropylene Textile for Air Pollutant Filtering

Wave Analysis of Thick Rectangular Graphene Sheets: Thickness and Small-Scale Effects on Natural and Bifurcation Frequencies

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