Hydrophobicity and surface free energy to assess spent coffee grounds as soil amendment. Relationships with soil quality

Cervera‐Mata, Ana; Aranda, V.; Ontiveros-Ortega, A.; Comino, Francisco; Martín‐García, Juan Manuel; Vela-Cano, M.; Delgado, Gabriel

doi:10.1016/j.catena.2020.104826

Cited by 19 publications

(12 citation statements)

References 76 publications

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“…However, as the coffee amount increased from 1 to 5 wt%, the WCA of the seaweed film gradually increased from 39.31° to 44.63°. This decrease is most likely due to the hydrophobicity of coffee powder [ 31 ]. It is critical for the barrier properties of seaweed/coffee film to have a high WCA value.…”

Section: Resultsmentioning

confidence: 99%

Coffee Waste Macro-Particle Enhancement in Biopolymer Materials for Edible Packaging

et al. 2023

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Plastic pollution has raised interest in biodegradable and sustainable plastic alternatives. For edible food packaging, seaweed biopolymers have been studied for their film-forming properties. In this study, packaging films were developed using the solvent casting technique from natural red seaweed (Kappaphycus alvarezii) and coffee waste product. The physico-chemical and thermal properties of seaweed/coffee biopolymer films was obtained using dynamic light scattering (DLS), scanning electron microscopy (SEM), Fourier transmission irradiation (FT-IR), water contact angle measurement (WCA) and thermogravimetric analysis (TGA). The characterization study was carried out to improve the film’s morphological, thermal, and mechanical properties. The average particle size of coffee waste was found to be between 1.106 and 1.281 µm, with a zeta potential value of −27.0 mV indicating the compound’s strong negative charge. The SEM analysis revealed that the coffee filler was evenly dispersed in the polymer matrix, improving the film’s structural properties. The FT-IR result shows that coffee waste was successfully incorporated over the film matrix with the presence of a N-H bond. The hydrophobic property of the film was enhanced with the incorporation of coffee filler, indicating increased water contact angle compared to the neat film. The tensile properties of the biopolymer film were significantly improved at 4 wt% coffee powder with optimum tensile strength (35.47 MPa) with the addition of coffee waste powder. The incorporation of coffee waste into the seaweed matrix increased the functional properties of the fabricated biopolymer film. Thus, seaweed/coffee biopolymer film has the potential to be used in food packaging and other applications.

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Section: Resultsmentioning

confidence: 99%

Coffee Waste Macro-Particle Enhancement in Biopolymer Materials for Edible Packaging

et al. 2023

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“…This increase in the biological activity of the soil due to the addition of SCG has been recently reported by our research group (Cervera-Mata et al, 2022), seeing how SCG significantly increased CO 2 emissions into the atmosphere. In other works (Cervera-Mata et al, 2021), it has been shown that the addition of SCG stimulates the activity of fungi.…”

Section: Discussionmentioning

confidence: 86%

“…The modification of the physical properties of the soil by the addition of SCG seems to be related in part to the hydrophobicity. Thus, Cervera‐Mata et al (2021) compared the effect of SCG on the physical properties of a red soil rich in illite and kaolinitic clays with those of an alluvial soil rich in smectites. In both soils, these authors found that SCG modified soil parameters related to hydrophobicity: water drop penetration times, contact angle and surface free energy components.…”

Section: Discussionmentioning

confidence: 99%

“…They were later spread, air‐dried and stored in a dry place. Their main characteristics are shown in Table 1 (Cervera‐Mata et al, 2021). SCG are characterized by their high content of C (48 g kg −1 ) and K (3426 mg kg −1 ).…”

Section: Methodsmentioning

confidence: 99%

“…These authors emphasize that despite the phytotoxic effects of SCG, its proven effects on the physical and chemical fertility of soils, as well as its influence on the soil microbiota, make this form of SCG reuse advisable. Previously, our research group has evaluated the effect that the addition of this residue has on Mediterranean agricultural soils in relation to its physical, chemical, physicochemical and biological properties (Cervera‐Mata et al, 2018, 2021, 2022; Cervera‐Mata, Martín‐García, et al, 2019; Comino et al, 2020; Vela‐Cano et al, 2019). In summary, the main results obtained by the aforementioned authors were: (a) SCGs modify the C cycle by increasing its recalcitrant forms and increasing the content of humic and fulvic acids; (b) SCGs increase the contents of total N and the available forms of K and P; (c) they increase water retention at −33 and −1500 kPa, decrease bulk density, modify size and shape of soil aggregates and, increase total porosity and structural stability; (d) as negative effects of the addition of SCGs, there is a decreasing plant growth and a decrease in plant available water.…”

Section: Introductionmentioning

confidence: 99%

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