scholarly journals Recycling of spent coffee grounds for useful extracts and green composites

RSC Advances ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 2682-2692
Author(s):  
Yihao Leow ◽  
Pek Yin Michelle Yew ◽  
Pei Lin Chee ◽  
Xian Jun Loh ◽  
Dan Kai
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Chemical Composition ◽  
Chemical Compounds ◽  
Green Composites ◽  
Spent Coffee Grounds ◽  
Coffee Grounds ◽  
Coffee Oil ◽  
Properties Of Composites

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.

scholarly journals Improving the Mechanical Ductility and Toughness of Injection-molded Polylactide Pieces by the Dual Incorporation of Liquor Waste Derived Spent Coffee Grounds and Oligomers of Lactic Acid

2021 ◽  
Author(s):  
Enrique Terroba-Delicado ◽  
Stefano Fiori ◽  
Sergio Torres-Giner ◽  
Jaume Gomez-Caturla ◽  
Nestor Montanes ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Chemical Interaction ◽  
Extrusion Process ◽  
Green Composites ◽  
Green Composite ◽  
Spent Coffee Grounds ◽  
Reinforcing Fillers ◽  
Coffee Grounds ◽  
Coffee Oil ◽  
The Impact

Abstract This work puts the Circular Bioeconomy’s concept into action, originally valorizing residues from the beverage liquor coffee industry into reinforcing fillers for green composites of polylactide (PLA). The as-received spent coffee grains derived from liquor waste were first milled to obtain the so-called spent coffee grounds (SCGs), which were then incorporated at 20 wt.% into PLA by extrusion. With the aim of improving the compatibility between the biopolyester and the lignocellulosic particles, two oligomers of lactic acid (OLAs), namely OLA2 and OLA2mal, being the latter functionalized with maleic anhydride (MAH), were both added during the extrusion process at 10 wt.%. The resultant compounded pellets were finally shaped into pieces by injection molding for characterization. Results showed that, as opposite to most claims published in the literature of PLA composites based on lignocellulosic fillers derived from soluble coffee wastes, the incorporation of liquor waste derived SCGs increased the ductility of the pieces by nearly 280% due to their high coffee oil content. The incorporation of OLA2 and OLA2mal contributed to improve the impact strength of the pieces by approximately 6% and 12.6%, respectively. The higher performance of OLA2mal was ascribed to a reduction of crystallinity in the green composite due to the chemical interaction by the MAH groups. However, the incorporation of SCGs into PLA slighlty reduced the thermal stability and yielded a dark-to-brown color, whereas it also delayed the disintegration rate of the pieces in controlled compost soil. Therefore, the results attained herein open up novel opportunities for the development of green composites of PLA with higher ductility and toughness through the valorization of liquor coffee wastes.

scholarly journals Biodiesel Production from Spent Coffee Grounds

2017 ◽  
Vol 25 (40) ◽  
pp. 113-121 ◽  
Author(s):  
Lenka Blinová ◽  
Alica Bartošová ◽  
Maroš Sirotiak
Keyword(s):  
Organic Solvents ◽  
Oil Extraction ◽  
Waste Material ◽  
Biodiesel Production ◽  
Spent Coffee Grounds ◽  
Drying Oil ◽  
Biodiesel Feedstock ◽  
Coffee Grounds ◽  
Coffee Oil

Abstract The residue after brewing the spent coffee grounds is an oil-containing waste material having a potential of being used as biodiesel feedstock. Biodiesel production from the waste coffee grounds oil involves collection and transportation of coffee residue, drying, oil extraction, and finally production of biodiesel. Different methods of oil extraction with organic solvents under different conditions show significant differences in the extraction yields. In the manufacturing of biodiesel from coffee oil, the level of reaction completion strongly depends on the quality of the feedstock oil. This paper presents an overview of oil extraction and a method of biodiesel production from spent coffee grounds.

scholarly journals On the Spent Coffee Grounds Biogas Production

2016 ◽  
Vol 64 (4) ◽  
pp. 1279-1282 ◽  
Author(s):  
Tomáš Vítěz ◽  
Tomáš Koutný ◽  
Martin Šotnar ◽  
Jan Chovanec
Keyword(s):  
Organic Matter ◽  
Anaerobic Digestion ◽  
Chemical Composition ◽  
Fermentation Process ◽  
Biogas Production ◽  
Processing Waste ◽  
Spent Coffee Grounds ◽  
Input Material ◽  
Coffee Grounds ◽  
The World

Due to the strict legislation currently in use for landfilling, anaerobic digestion has a strong potential as an alternative treatment for biodegradable waste. Coffee is one of the most consumed beverages in the world and spent coffee grounds (SCG) are generated in a considerable amount as a processing waste during making the coffee beverage. Chemical composition of SCG, presence of polysaccharides, proteins, and minerals makes from the SCG substrates with high biotechnological value, which might be used as valuable input material in fermentation process. The methane production ranged from 0.271–0.325 m3/kg dry organic matter.

scholarly journals Extrusion Compounding Process for the Development of Eco-Friendly SCG/PP Composite Pellets

2019 ◽  
Vol 11 (6) ◽  
pp. 1720 ◽  
Author(s):  
Joo Sohn ◽  
Youngjae Ryu ◽  
Chang-Seok Yun ◽  
Kun Zhu ◽  
Sung Cha
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Waste Biomass ◽  
Spent Coffee Grounds ◽  
Coffee Grounds ◽  
Petroleum Resources ◽  
Composite Pellets ◽  
Resource Circulation ◽  
American Society ◽  
The Impact

As the consumption of coffee increases worldwide, the amount of spent coffee grounds (SCG) is gradually increasing every year. Some of these grounds are recycled for composting, but most are discarded, which causes widespread financial and social costs. We developed a bio-based plastic pellet by blending polypropylene (PP) with waste biomass SCG to convert it into a sustainable, recyclable eco-friendly material. It was confirmed that extrusion compounding for SCG/PP composite pellets and injection molding with good formability are possible. To evaluate the formability of the composite pellets, American Society for Testing and Materials (ASTM) test specimens were prepared for evaluating mechanical properties by injection molding. As a result of the measurement of the test samples, the mechanical properties of SCG/PP composite pellets were generally lowered as the SCG content increased. However, the impact strength of SCG/PP composite based on the HOMO-PP matrix improved as the SCG content increased. In addition, Young’s modulus of SCG/PP increased as the SCG content increased. In the future, this study will be applied to manufacture of products that requires non-toxic products, such as disposable products and food containers, realizing commercialization of eco-friendly products and thereby replacing finite petroleum resources and practicing resource circulation and environmental protection.

The Physical and Mechanical Properties of Biocomposite Films Composed of Poly(Lactic Acid) with Spent Coffee Grounds

2019 ◽  
Vol 824 ◽  
pp. 87-93
Author(s):  
Nattawut Suaduang ◽  
Sukunya Ross ◽  
Gareth M. Ross ◽  
Supatra Pratumshat ◽  
Sararat Mahasaranon
Keyword(s):  
Lactic Acid ◽  
Physical And Mechanical Properties ◽  
Poly Lactic Acid ◽  
Biodegradable Films ◽  
Spent Coffee Grounds ◽  
Elongation At Break ◽  
Biocomposite Films ◽  
Coffee Grounds ◽  
Twin Screw ◽  
Coffee Oil

The aim of this research was to prepare and characterize biocomposite films from poly(lactic acid) (PLA) with spent coffee grounds (SCG). PLA can be derived from renewable resources. The SCG component consists of cellulose, hemicellulose and coffee oil 10.98%. SCG can simultaneously act as plasticizer and filler in the composites that can enhance the mixing process. The PLA/SCG biocomposite films were processed by a twin-screw extruder and blow film extruder. They were prepared by using various SCG concentrations (0%, 5%, 7.5% and 10% of SCG). The Scanning Electron Microscopy (SEM) results showed that the PLA matrix with SCG was miscible and had the SCG was well good distributed. Elongation at break was increased, when the amount of SCG was increased, with the results of PLA and PLA/SCG 10% being 5.07% and 6.63% respectively, while hardness, brittleness and tensile strength decreased. UV-vis spectrophotometric measurement of PLA/SCG biocomposite films showed a considerable reduction in transmission of all UV wavelengths (UV-A, -B and -C) and visible light with increasing SCG content. Hence, in this research, SCG can be used as filler in PLA films in order to produce biodegradable films and developed as agricultural film products. The PLA/SCG biocomposite films have shown good properties and are environmentally friendly.

Improvement of Mechanical Properties of Curaua Fiber Green Composites

2007 ◽  
Vol 334-335 ◽  
pp. 369-372
Author(s):  
Takanori Matsuo ◽  
Alexandre Gomes ◽  
Koichi Goda ◽  
Jun Ji Ohgi
Keyword(s):  
Mechanical Properties ◽  
Cyclic Load ◽  
Fracture Strain ◽  
Fiber Composites ◽  
Green Composites ◽  
High Concentration ◽  
Environment Friendly ◽  
Curaua Fibers ◽  
Curauá Fiber ◽  
Properties Of Composites

Environment-friendly green composites were developed by combining a biodegradable resin with curaua fibers. The composites were fabricated by three different methods, i.e. direct, pre-forming and prepreg sheets methods. Mechanical properties of composites fabricated by all three methods were evaluated through tensile test. Moreover, green composites reinforced by fibers treated with high concentration alkali solution were fabricated by pre-forming and prepreg sheets methods. The results showed that fracture strain of alkali-treated fiber composites increased twice to three times larger than that of untreated-fiber composites. Finally, effect of cyclic load application on tensile strength of curaua single fibers was investigated.

Sulfur-Containing Composite Material for the Concrete Production

2016 ◽  
Vol 712 ◽  
pp. 171-175 ◽  
Author(s):  
Irina Frolova ◽  
Viktor V. Tikhonov ◽  
Anna P. Poltoranina ◽  
Natalya Usoltseva ◽  
Shuang Cheng Fu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Composite Material ◽  
Fly Ash ◽  
Chemical Composition ◽  
Power Plant ◽  
Mechanical Characteristics ◽  
Combined Heat And Power ◽  
Concrete Production ◽  
Sulfur Containing

The chemical composition and particle size distribution as well as the physical-mechanical characteristics of fly ash of Krasnokamensk combined heat and power plant (CHPP) were determined. The revealed features provided the development of the technology of fly ash enrichment. The composite building material based on both fly ash of Krasnokamensk CHPP and technical sulfur was developed. Aluminum chloride was proposed to be used as modifier. The basic physical-mechanical properties of sulfur crushed stone were investigated.

Sign in / Sign up

Export Citation Format

Share Document