Spent coffee waste as a renewable source for the production of sustainable poly(butylene succinate) biocomposites from a circular economy perspective

Gaidukova, Gerda; Platnieks, Oskars; Aunins, Arturs; Barkāne, Anda; Ingrao, Carlo; Gaidukovs, Sergejs

doi:10.1039/d1ra03203h

Cited by 32 publications

(24 citation statements)

References 66 publications

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“…Unlike the findings reported by Gaidukova et al, SCG in this case functioned as both fiber reinforcement and lubricant. [ 33 ] To clarify the former role, Figure 7B shows that the tensile strengths of TPS/SCG‐5 (2.02

\pm

0.08 MPa) and TPS/SCG‐10 (1.94

\pm

0.12 MPa) were modestly higher than that of pure TPS (1.92

\pm

0.06 MPa) along with an upgrade in its tensile modulus (rose by 28.3%) and ensuing brittleness. This took advantage of the compatibility between two hydrophilic materials, which was contrary to the deterioration effect of PP, PBS or PLA when combined with SCG.…”

Section: Resultsmentioning

confidence: 99%

Spent coffee grounds: An intriguing biowaste reinforcement of thermoplastic starch with potential application in green packaging

et al. 2022

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With respect to the explosion of single-use plastic packaging consumption during the COVID-19 pandemic, environmentally friendly substitutes are critically needful for sustainable development. Therefore, the present work focuses on the functional properties of bioplastic blends prepared through hot compressing molding of thermoplastic starch (TPS) and spent coffee grounds (SCG) in different ratios (0%-20% SCG) as the potential features of SCG were extensively employed in biocomposites for the first time. The insertion of dark brown SCG into TPS hindered UV transmission by 100% at 320 nm and 99.2% at 400 nm. Moreover, the samples with 15% and 20% SCG induced a surge in radical scavenging activity from 7.95% to over 92% at a concentration of 0.1 g/ml owing to the rich source of antioxidants in SCG. The lignin component and high carbon content also improved the thermal performance of TPS/SCG blends, enhancing thermal stability, delaying onset and maximum degradation temperatures, and achieving the HB rating in the UL-94 test. Compared to a pure TPS matrix, TPS blends incorporating up to 10% SCG exhibited improvement in elastic modulus without deterioration of tensile strength.

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\pm

0.08 MPa) and TPS/SCG‐10 (1.94

\pm

0.12 MPa) were modestly higher than that of pure TPS (1.92

\pm

Section: Resultsmentioning

confidence: 99%

Spent coffee grounds: An intriguing biowaste reinforcement of thermoplastic starch with potential application in green packaging

et al. 2022

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“…SCG is usually used as a natural amendment for farming purposes [5], but it is also used to produce biodiesel, biogas, bioethanol, and various extraction products for cosmetics and medical industry [6,7]. From the aspect of circular economy, SCG is a cheap raw material that can be used as a filler in composite materials [8].…”

Section: Abstract: Biobased Materials; Waste Coffee; Itaconic Acid; S...mentioning

confidence: 99%

Biobased composite materials obtained from unsaturated polyester resins and waste coffee

Pantić¹

2022

Proceedings of the 35th International Congress on Process Engineering

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Replacing styrene with biobased monomers to produce fully biobased unsaturated polyester resins (UPRs) turned out to be quite a challenging task. Styrene has been recognized as a hazardous and a potentially carcinogenic substance for human health. Using dimethyl itaconate as an alternative reactive diluent to styrene, which can be obtained from renewable resources, enables low viscosity for easy manipulation of mentioned UPRs. Fully biobased UPRs in question were based on itaconic acid, succinic acid, and propylene glycol, which were then diluted with dimethyl itaconate. Having in mind that UPRs can be used as a matrix for composite materials, this paper examines the effect of different weight ratios of spent coffee grounds as a filler. To determine the application of thus obtained composite materials, characterization consisted of examining mechanical properties based on viscosity measurements, uniaxial stretching experiments, FTIR spectroscopy and gel content analysis.

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“…Hence, this leaves up to 94% as waste, which includes by-products from the process as well as water from the drying of the seeds [ 4 ], and spent coffee grounds, which comply to the largest contribution for coffee bio-waste, with approximately six million tons being produced yearly worldwide [ 5 ]. This type of waste is underutilized with large amounts ending in landfills which in turn can ultimately create serious environmental concerns [ 5 ], and constitutes a direct cost to producers, since it can lead to CO 2 and other greenhouse gas emissions, and the release of chemicals such as caffeine, polyphenols, and tannins into the environment [ 2 , 6 ]. Additionally, similarly to other organic wastes, spent coffee grounds’ degradation involves great oxygen consumption due to its high carbon content [ 7 ], and there is an eminent risk of spontaneous combustion [ 5 ], heightening the need for its further valorization.…”

Section: Introductionmentioning

confidence: 99%

Valorization of Spent Coffee Grounds as a Natural Source of Bioactive Compounds for Several Industrial Applications—A Volatilomic Approach

Andrade

Perestrelo

Câmara

2022

Foods

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Coffee is one of the most popular beverages worldwide, whose production and consumption result in large amounts of waste, namely spent coffee grounds, constituting an important source of compounds for several industrial applications. This work focused on the establishment of the volatile fingerprint of five spent coffee grounds from different geographical origins using headspace solid-phase microextraction coupled with gas chromatography-mass spectrometry (HS-SPME/GC-MS), as a strategy to identify volatile organic metabolites (VOMs) with potential application in the food industry as antioxidant, anti-inflammatory, and antiproliferative agents. One hundred eleven VOMs belonging to different chemical families were identified, of which 60 were found in all spent coffee grounds analyzed. Furanic compounds (34%), nitrogen compounds (30%), and esters (19%) contributed significant to the total volatile fingerprint. The data obtained suggest that spent coffee grounds have great potential to be used as raw material for different approaches in the food industry towards the development of new food ingredients or products for human consumption, in addition to pharmaceutical and cosmetic applications, namely as antioxidant (e.g., limonene, carvacrol), antimicrobial (e.g., pyrrole-2-carboxaldehyde, β-myrcene) and anti-inflammatory (e.g., furfural, 2-furanmethanol) agents, promoting their integral valorization within the circular bioeconomy concept.

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Spent coffee waste as a renewable source for the production of sustainable poly(butylene succinate) biocomposites from a circular economy perspective

Abstract: Spent coffee waste from espresso machines was used as a renewable filler for the melt processing of sustainable poly(butylene succinate) biocomposites with enhanced exploitation properties.

Cited by 32 publications

References 66 publications

Spent coffee grounds: An intriguing biowaste reinforcement of thermoplastic starch with potential application in green packaging

Spent coffee grounds: An intriguing biowaste reinforcement of thermoplastic starch with potential application in green packaging

Biobased composite materials obtained from unsaturated polyester resins and waste coffee

Valorization of Spent Coffee Grounds as a Natural Source of Bioactive Compounds for Several Industrial Applications—A Volatilomic Approach

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