Recycling of spent coffee grounds for useful extracts and green composites

Leow, Yihao; Yew, Pek Yin Michelle; Chee, Pei Lin; Loh, Xian Jun; Kai, Dan

doi:10.1039/d0ra09379c

Cited by 53 publications

(41 citation statements)

References 38 publications

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“…When increasing from 30 wt % SCGs to 60 wt % SCGs, the mechanical strength, in general, tends to decrease. is is completely consistent with the general rule [8,10]. Patil International Journal of Chemical Engineering [23,25,26].…”

Section: Mechanical Propertiessupporting

confidence: 85%

“…is may be related to successful oil removal during NaOH treatment. e absence of oil along with reduced particle size may allow for better homogeneity in epoxy, improved surface interaction between SCGs-epoxy [8]. e mechanical properties obtained give similar values to other biosynthetic materials, confirming feasibility of using used coffee composites production facilities [5,8,11,23,25].…”

Section: Fire-retardant Propertymentioning

confidence: 53%

“…is is completely normal because when the surface of SCGs has not been modified much, the compatibility will decrease. Phase separation is highly efficient when the surface of the SCGs is modified and the input content is at the right level [8]. e dispersion of ESCG particles is homogeneous as depicted in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

“…Research results show that when adding used coffee grounds to epoxy resin, some mechanical properties are slightly reduced but not much, and some other mechanical properties are also significantly improved. Coffee grounds can be said as the best material for composites [8,9]. Suaduang et al studied the inclusion of coffee grounds in polylactic acid at the concentrations of 5 wt.%, 7.5 wt.%, and 10 wt.%.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid Biocomposites Based on Used Coffee Grounds and Epoxy Resin: Mechanical Properties and Fire Resistance

Nguyen

2021

International Journal of Chemical Engineering

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Studies on using biomaterials hybridized with other materials to produce biomaterials have been paid more attention due to their low cost, abundance, renewability, and degradability. Therefore, these materials are ecofriendly and nontoxic to humans. A large number of used coffee grounds (SCGs) are often discarded and replacements are necessary for dealing with environmental problems. This work developed sustainable materials by reusing SCGs. Used coffee grounds were mixed with epoxy resin at different amounts: 30 wt %, 40 wt %, 50 wt %, and 60 wt %. SCGs were treated with 0.5 N NaOH, at SCGs/NaOH ratio of 1 : 2. SEM images showed that the material with 30 wt % SCGs has good compatibility without phase division on the SCGs-epoxy interface. Results of mechanical properties of epoxy composites with 30 wt % SCGs are as follows: tensile strength of 44.81 ± 10 MPa, flexural strength of 80.07 ± 0.16 MPa, compressive strength of 112.56 ± 0.11 MPa, and Izod strength and impact of 8.21 ± 0.19 kJ/m2. In terms of flame-retardant properties, the oxygen index is limited to 20.8% ± 0.20 and the burning rate according to UL94HB is 27.02 ± 0.29 mm/min. The obtained results indicate that it is possible to produce biohybrid composites from epoxy resin and SCGs. This work offers an ecofriendly alternative method to use the waste of the coffee industry. It contributes to improvements of the general characteristics of composites such as mechanical, thermal, and flame-retardant properties. This work proved that SCGs have a high potential to be used in a wide range of composite materials for civil engineering applications.

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Section: Mechanical Propertiessupporting

confidence: 85%

Section: Fire-retardant Propertymentioning

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hybrid Biocomposites Based on Used Coffee Grounds and Epoxy Resin: Mechanical Properties and Fire Resistance

Nguyen

2021

International Journal of Chemical Engineering

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“…За аналітичними даними в Україні протягом 2019 року було відкрито на 16% більше кав'ярень, ніж в 2018 році [2]. За даними аналітичної компанії Pro-Consulting, не дивлячись на кризу, пов'язану з пандемією COVID- [8].…”

unclassified

Сучасні Методи Утилізації Кавового Шламу, Як Елемет Природоохоронних Технологій

Макас¹

2021

Scientific Practice: Modern and Classical Research Methods

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Крусір Галина Всеволодівна д-р. техн. наук, проф., завідувач кафедри екології та природоохоронних технологій Одеська Національна Академія Харчових Технологій УКРАЇНА Кава це напій, що виготовляють зі смаженого насіння плодів «бобові»

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Utilization of spent coffee grounds as fillers to prepare polypropylene composites for food packaging applications

Song

Yang

Cheng

et al. 2023

Microscopy Res & Technique

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Biomass‐derived wastes as the additive of nondegradable plastics have been paid more attention due to the ever‐growing environmental pollution and energy crisis. Herein, the spent coffee grounds (SCG) have been used as fillers in polypropylene (PP) after the heat treatment to realize its recycling utilization. The effect of the heat treatment atmosphere on the properties of the obtained SCG and SCG/PP composites has been investigated systematically. The results show that the residual coffee oil can be removed more thoroughly under an air atmosphere than under a nitrogen atmosphere at a relatively low cost and an eco‐friendly process. The lower residual oil rate of SCG is beneficial to improve the comminution and further enhance the affinity with the PP matrix. The obtained SCG/PP composites hold lower water absorption, higher hydrophobicity, and better mechanical properties, implying their potential applications in the field of food packaging.Research Highlights Spent coffee grounds have been used as fillers in PP after the heat treatment. The heat treatment in the air is more favorable for the removal of the coffer oil of SCG. The low residual oil rate in SCG can improve its comminution and affinity with PP. The SCG/PP composites hold excellent performances for food packaging applications.

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Recycling of spent coffee grounds for useful extracts and green composites

Abstract: Spent coffee grounds are mostly discarded as waste. Here we recycle them for chemical compounds and as composite material fillers. Our study evaluated the chemical composition of coffee oil extracts and mechanical properties of composites formed.

Cited by 53 publications

References 38 publications

Hybrid Biocomposites Based on Used Coffee Grounds and Epoxy Resin: Mechanical Properties and Fire Resistance

Hybrid Biocomposites Based on Used Coffee Grounds and Epoxy Resin: Mechanical Properties and Fire Resistance

Сучасні Методи Утилізації Кавового Шламу, Як Елемет Природоохоронних Технологій

Utilization of spent coffee grounds as fillers to prepare polypropylene composites for food packaging applications

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