Natural and recycled materials for sustainable membrane modification: Recent trends and prospects

Al-Shaeli, Muayad; Al-Juboori, Raed A.; Aani, Saif Al; Ladewig, Bradley P.; Hilal, Nidal

doi:10.1016/j.scitotenv.2022.156014

Cited by 30 publications

(18 citation statements)

References 303 publications

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“…Secondary composites using recovered fibers are usually created based on thermoplastic materials, such as LDPE [46]. The strength values of the fibers themselves [11] are 2-3 orders higher than their matrixes [27], so the bonding of their components plays a decisive role in strengthening composites.…”

Section: -4-reinforcement With the Recovered Fibersmentioning

confidence: 99%

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Thermal Regeneration and Reuse of Carbon and Glass Fibers from Waste Composites

et al. 2022

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This article aims to develop a method for regenerating and reusing carbon and glass fibers extracted from unrecyclable scraps of carbon plastics, printer parts, and laminating coating. A comparison of known methods of fiber regeneration revealed the advantages of thermal treatment: absence of costs of reagents and complex equipment; better preservation of composition; and strength of fibers. Based on the results of thermographic analysis of wastes in nitrogen and air, the destruction temperatures of their organic matrices were determined (200-460°С), and the use of calcination instead of pyrolysis was justified. The appearance and surface quality of the regenerated fibers are characterized by optical and electron microscopy. It has been established that quantitative extraction of pure carbon and glass fibers from waste crushed to 1 cm is efficient by their calcination at 700 °C for 0.5 h and 500 °C for 1 h, respectively. The principle of creating new composites with the obtained fibers based on the similarity of their composition and binding materials (matrices) has been proposed. It was shown that the introduction of 1 wt% of fibers into slag blocks and active carbon pellets considerably increases their compressive strength, but the bending strength does not change due to dispersed reinforcement. Possible improvement of mechanical properties of products requires reagent treatment of the fiber surface or the introduction of binder additives. Calculations show that the developed method of recycling composite waste can produce 2.3 tons/hour of reinforced building materials that are good for the environment and the economy, excluding expenses for landfill waste disposal and reducing the cost of the product by replacing the primary fiber for the secondary one. Doi: 10.28991/ESJ-2022-06-05-04 Full Text: PDF

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Section: -4-reinforcement With the Recovered Fibersmentioning

confidence: 99%

“…A representative review of PCM waste management technologies was performed by specialists at the All-Russian Research Institute of Aviation Materials (VIAM) [26,27]. Total Russian production of the PCM since 2020 was estimated at 118,000 tons per year.…”

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Thermal Regeneration and Reuse of Carbon and Glass Fibers from Waste Composites

et al. 2022

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Section: Introductionmentioning

confidence: 99%

“…33 Thus, efforts to directly transform plastic waste into value-added products, such as polymeric membranes, is a step forward toward more sustainable industrial practices, specifically in the membrane industry. 6,34,35 Several works have reported the successful utilization of plastic waste for membrane fabrication. Pulido et al 36 fabricated polyethylene terephthalate (PET) ultrafiltration membranes from plastic waste by NIPS, showing good performance even at temperatures up to 100 °C and high resistance towards harsh solvents.…”

Section: Introductionmentioning

confidence: 99%

Bio-based solvents for polyolefin dissolution and membrane fabrication: from plastic waste to value-added materials

et al. 2023

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“…This occurs in concrete due to supplementary cementitious materials and chemical admixtures. Gum Arabic's effect on concrete, admixtures are used in concrete for a variety of reasons, including preventing water bleeding to the surface, improving the mix's workability, accelerating or delaying the initial setting of the concrete, improving water tightness, producing non-skid concrete, inhibiting the set of cement paste, improving early strength gains, producing a colored surface, and making the concrete more resistant to deterioration caused by repealing [9]. Gum Arabic is one of the admixtures used in concrete to change its characteristics.…”

Section: Introductionmentioning

confidence: 99%

Gum Arabic as an Admixture in Modified Concrete Mixed with Calcined Kaolin

2022

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The use of calcined kaolin (CK) as a cementitious material in construction has attracted the interest of various researchers due to its environmental, mechanical, and physical qualities, all of which contribute to the lowering of cement usage. Studies have reported numerous problems associated with its use in concrete, apart from the ecological benefit that CK can provide. For instance, there is an issue of increased water demand due to smaller particle size, which generates much more heat in concrete, which has a detrimental effect on the mechanical and physical properties of concrete. This paper presents the analysis of an investigation aimed at using gum Arabic (GA) as a biopolymer admixture and calcined kaolin as a partial replacement of cement to improve the mechanical properties and durability of concrete. GA proportions ranged from 0 to 1% by weight of cement. Calcined kaolin (CK) was used to replace 5, 10, 15, 20, 25, and 30% of the cement content, respectively. Compressive strength, splitting tensile strength, density, strength loss, and weight loss tests were all performed to validate the structural performance of the modified concrete. The compressive tests, performed after 28 days from the time the mixture was made, demonstrated that the maximum percentage of CK that could replace cement without affecting the mechanical properties of concrete was 20%. Beyond 20%, concrete does not exhibit good compressive strength properties. The results also revealed decreased compressive strength and splitting tensile strength tests as the percentage of CK increased. After 56 days, compressive strength at 5% CK and 10% CK increased slightly by 0.743% and 1.162 %, respectively, compared to the control sample. The inclusion of 0.8%GA increased the compressive strength by 8.94% compared to the control sample (0%CK + 0%GA + 100%OPC) after 56 days. The results of durability tests showed that 0.6% GA had a higher compressive strength than other percentages containing GA. Doi: 10.28991/CEJ-2022-08-05-010 Full Text: PDF

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Natural and recycled materials for sustainable membrane modification: Recent trends and prospects

Cited by 30 publications

References 303 publications

Thermal Regeneration and Reuse of Carbon and Glass Fibers from Waste Composites

Thermal Regeneration and Reuse of Carbon and Glass Fibers from Waste Composites

Bio-based solvents for polyolefin dissolution and membrane fabrication: from plastic waste to value-added materials

Gum Arabic as an Admixture in Modified Concrete Mixed with Calcined Kaolin

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