Spent coffee grounds: Present and future of environmentally friendly applications on industries-A review

Zhao, Nan; Liu, Zhongyang; Yu, Ting; Yan, Fujie

doi:10.1016/j.tifs.2023.104312

Cited by 8 publications

(3 citation statements)

References 138 publications

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“…Thus, it contributes to the generation of a significant amount of waste. The main solid residue of the coffee brewing process is known as spent coffee grounds (SCGs) [3]. It is assessed that about 60 million kg of this by-product is produced daily, worldwide [4].…”

Section: Introductionmentioning

confidence: 99%

“…A significant amount of SCGs are deposited in landfills or incinerated, leading to increased greenhouse gas emissions [5]. Moreover, SCGs contain various organic compounds, e.g., caffeine, polysaccharides, cellulose and tannins, that potentially can be transformed into toxic substances, causing environmental pollution [3,6].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, global attention has been focused on the potential for transformation into a valuable resource for various commercial applications [5]. It has been applied in the food, pharmaceutical and cosmetic industries [3]. Other applications are related to its adsorption capabilities; it has been used for bioremediation or production of adsorbents [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Pre-Treatment of Spent Coffee Grounds Using Hydrodynamic Cavitation

Szaja,

Montusiewicz,

Pasieczna-Patkowska

et al. 2024

Energies

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Spent coffee grounds (SCGs) constitute the main solid residue of the coffee brewing process. SCGs are generated in significant amounts daily, worldwide. The effective management of this waste through biological processes is still an unresolved problem. In this study, the application of hydrodynamic cavitation (HC) as a pre-treatment method for improving the biodegradability of SCGs suspended in municipal wastewater was proposed. An orifice plate with a conical concentric hole having inlet/outlet diameter of 3/10 mm was applied as the cavitation inducer. Three inlet pressures were chosen: 3, 5 and 7 bar. The effects in time intervals of 0, 5, 10, 20, 30 and 45 min were evaluated. The application of HC led to enhanced biodegradability for each case. The results of multi-criteria decision indicated that the most efficient combination in terms of biodegradability and energy usage was obtained at the pressure of 5 bar and duration of 20 or 30 min, depending on the adopted weights. The improvements of DOC/TOC (dissolved organic carbon/total organic carbon) ratio were 57% and 71%, as compared to the untreated samples. The release of caffeine was found at pressures of 5 and 7 bar. However, at 5 bar, this effect was noticed for the longest times, 30 and 45 min, respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pre-Treatment of Spent Coffee Grounds Using Hydrodynamic Cavitation

Szaja,

Montusiewicz,

Pasieczna-Patkowska

et al. 2024

Energies

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Nickel and Molybdenum Composites Decorated Nitrogen‐Doped Carbon Catalysts from Spent Coffee Grounds for Alkaline Hydrogen Evolution

Ge,

Zhang,

Meng

et al. 2024

ChemPlusChem

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Biomass‐derived materials can help develop efficient, environmentally friendly and cost‐effective catalysts, thereby improving the sustainability of hydrogen production. Herein, we propose a simple method to produce nickel and molybdenum composites decorated spent coffee grounds (SCG) as an efficient catalyst, SCG(200)@NiMo, for electrocatalytic hydrogen production. The porous carbon supporter derived form SCG provided a larger surface, prevented aggregation during the high temperature pyrolysis, optimized the electronic structure by N and provided a reducing atmosphere for the oxides reduction to form heterojunctions. The sieved SCG showed obvious improvement of HER performance and enhanced conductivity and long‐term durability. The obtained SCG(200)@NiMo exhibits the highest electrochemical performance for the hydrogen evolution reaction process, as evidenced by the overpotential of only 127 mV at a current density of ɳ10 and 97.7% catalytic activity retention even after 12 h of operation. This work may stimulate further exploration of efficient electrocatalysts derived from biomass.

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