Superior CO2 adsorption from waste coffee ground derived carbons

RSC Advances ◽  
2015 ◽  
Vol 5 (37) ◽  
pp. 29558-29562 ◽  
Author(s):  
Will Travis ◽  
Srinivas Gadipelli ◽  
Zhengxiao Guo
Keyword(s):  
Co2 Adsorption ◽  
Spent Coffee Grounds ◽  
Microporous Carbons ◽  
Surface Areas ◽  
Coffee Grounds ◽  
Coffee Ground

Utilising waste from spent coffee grounds KOH activated highly microporous carbons with surface areas of 2785 m2 g−1 and micropore volumes of 0.793 cm3 g−1 were synthesised that are capable of uptake capacities near 3 mmol g−1 at 50 °C and 1 bar.

scholarly journals Performance Optimisation of Fuel Pellets Comprising Pepper Stem and Coffee Grounds through Mixing Ratios and Torrefaction

Energies ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4667
Author(s):  
Sunyong Park ◽  
Hui-Rim Jeong ◽  
Yun-A Shin ◽  
Seok-Jun Kim ◽  
Young-Min Ju ◽  
...  
Keyword(s):  
Calorific Value ◽  
Basic Information ◽  
Spent Coffee Grounds ◽  
Mixing Ratios ◽  
Moisture Contents ◽  
Fuel Pellets ◽  
Coffee Grounds ◽  
Coffee Ground ◽  
Fuel Characteristics ◽  
By Products

Agricultural by-products have several disadvantages as fuel, such as low calorific values and high ash contents. To address these disadvantages, this study examined the mixing of agricultural by-products and spent coffee grounds, for use as a solid fuel, and the improvement of fuel characteristics through torrefaction. Pepper stems and spent coffee grounds were first dried to moisture contents of <15% and then combined, with mixing ratios varying from 9:1 to 6:4. Fuel pellets were produced from these mixtures using a commercial pelletiser, evaluated against various standards, and classified as grade A, B, or Bio-SRF. The optimal ratio of pepper stems to spent coffee grounds was determined to be 8:2. The pellets were torrefied to improve their fuel characteristics. Different torrefaction temperatures improved the mass yields of the pellets to between 50.87% and 88.27%. The calorific value increased from 19.9% to 26.8% at 290 °C. The optimal torrefaction temperature for coffee ground pellets was 230 °C, while for other pellets, it was 250 °C. This study provides basic information on the potential enhancement of agricultural by-products for fuel applications.

3D printing of spent coffee ground derived biochar reinforced epoxy composites

2021 ◽  
pp. 002199832110022
Author(s):  
Ahmed Alhelal ◽  
Zaheeruddin Mohammed ◽  
Shaik Jeelani ◽  
Vijaya K Rangari
Keyword(s):  
3D Printing ◽  
Flexural Modulus ◽  
Flexural Properties ◽  
Direct Write ◽  
Thermal And Mechanical Properties ◽  
Spent Coffee Grounds ◽  
Coffee Grounds ◽  
Spent Coffee Ground ◽  
Coffee Ground ◽  
3D Printed

Semi-crystalline carbon biochar is derived from spent coffee grounds (SCG) by a controlled pyrolysis process at high temperature/pressure conditions. Obtained biochar is characterized using XRD, SEM, and TEM techniques. Biochar particles are in the micrometer range with nanostructured morphologies. The SCG biochar thus produced is used as reinforcement in epoxy resin to 3 D print samples using the direct-write (DW) method with 1 and 3 wt. % loadings. Rheology results show that the addition of biochar makes resin viscous, enabling it to be stable soon after print; however, it could also lead to clogging of resin in printer head. The printed samples are characterized for chemical, thermal and mechanical properties using FTIR, TGA, DMA and flexure tests. Storage modulus improved with 1 wt. % biochar addition up to 27.5% and flexural modulus and strength increased up to 55.55% and 43.30% respectively. However, with higher loading of 3 wt. % both viscoelastic and flexural properties of 3D printed samples drastically reduced thus undermining the feasibility of 3D printing biochar reinforced epoxies at higher loadings.

scholarly journals Liberation of Protein and Antioxidative Compound from Spent Coffee Ground Through Protein Hydrolysis

2018 ◽  
Vol 34 (2) ◽  
pp. 95-103
Author(s):  
Noor Ariefandie Febrianto
Keyword(s):  
Antioxidant Activity ◽  
Incubation Time ◽  
Protein Hydrolysis ◽  
Spent Coffee Grounds ◽  
Coffee Grounds ◽  
Spent Coffee Ground ◽  
Coffee Ground ◽  
High Antioxidant Activity ◽  
Soluble Coffee ◽  
Antioxidative Compound

Spent coffee ground is a primary by-product obtained during soluble coffee processing and potential to be used as a high value product due to its proteincontent. The quite popular effort to utilize protein-contained material is to process it to hydrolysate which also possess antioxidant activity. This research was aimed to study the possibility of protein and antioxidative compound from spent coffee ground by means of enzymatic hydrolysis using crude papain enzymes. Crude papain was used in different concentration ranged from 2, 4 and 6% to incubate the spent coffee grounds for 2, 3, and 4 hours and then analyzed for its protein content and its antioxidant activity. Response surface methodology was employed to study the tendency of the effect of incubation time and enzymesconcentration towards hydrolysis results. The result showed that the use of crude papain was effective to liberate the protein and antioxidant compound from the spent coffee ground with its optimum condition utilized 6% of enzyme and 2 hours incubation time. At mentioned condition, it could extract up to 67.4% ofthe protein of the spent coffee ground and its hydrolysate possessed relatively high antioxidant activity.  

scholarly journals Fabrication and Properties of Hybrid Coffee-Cellulose Aerogels from Spent Coffee Grounds

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1942 ◽  
Author(s):  
Xiwen Zhang ◽  
Li Ping Kwek ◽  
Duyen K. Le ◽  
Men Shu Tan ◽  
Hai Minh Duong
Keyword(s):  
Absorption Capacity ◽  
Cotton Fibers ◽  
High Porosity ◽  
Oil Absorption ◽  
Spent Coffee Grounds ◽  
Water Contact ◽  
Coffee Grounds ◽  
Coffee Ground ◽  
Average Water ◽  
Hybrid Aerogels

A fully biodegradable hybrid coffee-cotton aerogel has been successfully developed from spent coffee grounds, 100% cotton fiber and polyvinyl alcohol (PVA) flakes via environmental friendly processes. The cotton fibers in coffee aerogel help to maintain the structure and improve the overall properties of the new hybrid coffee-cotton aerogel. The results show that increasing the concentration of fibers, while keeping the concentration of spent coffee grounds constant, the sinking of coffee ground particles in solution and shrinking effect on the aerogels are minimized and the overall mechanical and oil absorption properties are improved. The developed hybrid aerogels possess high porosity of 92–95% and super-hydrophobicity with an average water contact angle of 139°. Oil absorption capacity achieves 16 g/g with 0.50 wt.% of cotton fibers inside the coffee aerogel. Their thermal conductivity is in the range of 0.037–0.045 W/mK and compressive Young’s modulus achieves highest at 15.6 kPa. The properties of the hybrid aerogel indicate it as a potential material in several applications such as thermal insulation, oil absorption and filtration.

Pure and strontium carbonate nanoparticles functionalized microporous carbons with high specific surface areas derived from chitosan for CO2 adsorption

2019 ◽  
Vol 2 (3) ◽  
pp. 337-349 ◽  
Author(s):  
Gurwinder Singh ◽  
Steffi Tiburcius ◽  
Sujanya Maria Ruban ◽  
Dhanush Shanbhag ◽  
C. I. Sathish ◽  
...  
Keyword(s):  
Specific Surface ◽  
Co2 Adsorption ◽  
Strontium Carbonate ◽  
Microporous Carbons ◽  
Surface Areas ◽  
Specific Surface Areas

Preparation and properties of wool fabrics dyed with spent coffee ground extract

2017 ◽  
Vol 89 (1) ◽  
pp. 13-19 ◽  
Author(s):  
Eunmi Koh ◽  
Kyung Hwa Hong
Keyword(s):  
Antioxidant Ability ◽  
Bioactive Components ◽  
Spent Coffee Grounds ◽  
Natural Pigments ◽  
Wool Fabrics ◽  
Coffee Grounds ◽  
Spent Coffee Ground ◽  
Coffee Ground ◽  
Health Promoting ◽  
Solid Liquid

Spent coffee grounds (SCGs) are solid residues generated from coffee brewing and are mostly discarded as waste. However, SCGs are drawing much attention because they have many health-promoting compounds that exhibit anti-tumor, anti-allergic, antioxidant, and other activities. Therefore, we tried to use SCGs for fabric dyeing to apply functional and coloring effects to the fabrics. SCGs were extracted by a conventional solid–liquid method, and the extract was applied to wool fabrics through a laboratory infrared dyeing machine. It was found that the extract contained a significant number of bioactive components, such as tannins (ca. 0.61 mg/mL); caffeine (ca. 0.38 mg/mL); and phenolic compounds, including chlorogenic acid (ca. 0.21 mg/mL). The wool fabrics dyed with the SCG extract exhibited promising coloring effects, displaying deep-brown hues. In addition, the colorfastness to washing and light were superior to that of fabrics dyed with other natural pigments. In particular, the wool fabrics dyed with the SCG extract showed excellent antioxidant ability (≤86%) and high levels of ultraviolet blocking (≥98%).

scholarly journals Evaluation of Potency Spent Coffee Grounds for Make Black Compost

2020 ◽  
Vol 142 ◽  
pp. 04002
Author(s):  
Asmak Afriliana ◽  
Endar Hidayat ◽  
Mitoma Yoshiharu ◽  
Masuda Taizo ◽  
Hiroyuki Harada
Keyword(s):  
Lactic Acid ◽  
Mineral Content ◽  
Aerobic Condition ◽  
Spent Coffee Grounds ◽  
Good Characteristic ◽  
Carbon And Nitrogen ◽  
Coffee Grounds ◽  
Spent Coffee Ground ◽  
Coffee Ground ◽  
Abundant Element

The aim for this research is to make black compost from spent coffee grounds (SCG). The content of hemicellulose and lignin from SCG were 37.28% and 22.45%. For mineral content, Potassium (3 g/kg) is the most abundant element in spent coffee ground, followed by calcium (1.23 g/kg), magnesium (1.11 g/kg), phosphorus (0.89 g/kg) and natrium (0.7 g/kg). SCG also contains Carbon and Nitrogen ratios 1:19.5 which approaches the C / N ratio of the soil 1: 20. Composting process in aerobic condition for 2 months using Fungi, Bacillus and Lactic Acid Bacteria activator, produce black compost with good characteristic for plant and soil, such as C/N ratio under 1:10 and pH around 6 to 9.

scholarly journals Spent coffee grounds collected in Ho Chi Minh city: A good source of phenolic acids and fatty acids

2021 ◽  
pp. 321-329
Keyword(s):  
Fatty Acids ◽  
Phenolic Acids ◽  
Dry Weight ◽  
Ho Chi Minh City ◽  
Spent Coffee Grounds ◽  
Good Source ◽  
Water Extracts ◽  
Coffee Grounds ◽  
Spent Coffee Ground ◽  
Coffee Ground

Coffee is among the favorite drinks in Vietnam and many other countries. Production and consumption of coffee have released a huge amount of spent coffee ground. This study aimed to determine phenolic acids and fatty acids of spent coffee grounds collected in Ho Chi Minh city and how phenolic acid profile was affected by different environmentally friendly extractants. The results showed that average level of chlorogenic acid in ethanol/water extracts (840.4 779.9g/g) was significantly higher compared to water extracts (300.0g/g). Furthermore, the average total level of phenolic acids in ethanol/water extracts (1215.3g/g dry weight) was greater than that in the water extracts (779.9g/g dry weight). This indicated that ethanol/water outperformed water in regard to extraction of phenolic acids in the spent coffee grounds. Oil extracted from the spent coffee grounds was rich in linoleic acid (61g/g) and palmitic acid (47g/g). The findings of our study showed that the spent coffee grounds originating in Vietnam are a good source of phenolic acids and polyunsaturated fatty acids that could be utilized for food and nutraceutical production.

SPENT COFFEE GROUNDS FROM COFFEE VENDING MACHINES AS FEEDSTOCK FOR BIOGAS PRODUCTION

2018 ◽  
Vol 17 (10) ◽  
pp. 2401-2408 ◽  
Author(s):  
Rosa Marchetti ◽  
Ciro Vasmara
Keyword(s):  
Biogas Production ◽  
Spent Coffee Grounds ◽  
Vending Machines ◽  
Coffee Grounds
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