Synthesis and characterization of microporous activated carbon from coffee grounds using potassium hydroxides

Laksaci, Hamza; Khelifi, A.; Trari, M.; Addoun, A.

doi:10.1016/j.jclepro.2017.01.102

Cited by 141 publications

(38 citation statements)

References 36 publications

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“…42 A hysteresis loop of type H4 was found at the high relative pressure (>0.4 P/P 0 ), which is attributed to the existence of slitshaped mesopores. 43 Besides, the isotherm also characterised with a type IV shape in the medium pressure (0.3-0.8 P/P 0 ) and a sharp increase in adsorption at a high relative pressure ($0.9 P/P 0 ), which further imply the occurrence of capillary condensation in the mesopores and existence of wider pores. 44 From Fig.…”

Section: Characteristicsmentioning

confidence: 85%

Fabrication of cotton textile waste-based magnetic activated carbon using FeCl₃ activation by the Box–Behnken design: optimization and characteristics

Zhang

Yuan

et al. 2018

RSC Adv.

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Section: Characteristicsmentioning

confidence: 85%

Fabrication of cotton textile waste-based magnetic activated carbon using FeCl₃ activation by the Box–Behnken design: optimization and characteristics

Zhang

Yuan

et al. 2018

RSC Adv.

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“…Commercial ACs are mostly obtained from biomass waste [19,20]. Besides, many researches have been developed on the employ of biomass as a precursor of carbon active such as residues derives form tea, coffee or grapes and olives bones [6,21,22]. Within its wide variety of applications, the most common is the use of AC to removal several pollutants from wastewater due to its simplicity and low cost [9,18,[23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Extraction of Polyphenols and Synthesis of New Activated Carbon from Spent Coffee Grounds

Ramón-Gonçalves¹,

Alcaraz²,

Ferreras³

et al. 2019

Preprint

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A valorization process of spent coffee grounds (SCG) was studied. Thus, a two-stage process, a stage of extraction of the polyphenols and a stage of obtaining activated carbon (AC) by a carbonization process, was performed. The extraction was carried out with a hydro-alcoholic solution in a pressure reactor, modifying time and temperature. To optimize the extraction of polyphenols, a two-level factorial design with three replications at the central values was used. The best results were obtained by performing the extraction at 80 °C during 30 min, using a mixture of EtOH:H2O 1:1 (v/v) as extraction solution. Caffeine and chlorogenic acid were the most abundant compounds in the analyzed extracts, ranging from 0.09 to 4.8 mg∙g-1 and 0.06 to 9.7 mg∙g-1, respectively. The precursor obtained in the extraction stage were transformed into AC. An experimental design was realized in order to analyze the influence of different variables in the AC obtained process (reaction time and amount of potassium hydroxide used). Actived carbons with BET specific surface (SBET) comprised between 1600 m2∙g-1 and 2330 m2∙g-1 had a microporous surface. Under the optimum conditions, the obtained AC presented a maximum adsorption capacity of methylene blue (qm) between 411 mg∙g-1 and 813 mg∙g-1.

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“…Analysis of metallic content shows decreases between 5 and 30% for almost all metals after the conversion into CS, except for K and P. The content of these two metals decreased by 40% and 86%, respectively. It may be attributed to the carbonization temperature above their ebullition points which is 758.8 °C for K and 280.5 °C for P [41,42]. For MCS, the activation process led to decreases between 1 and 22% in metallic content.…”

Section: Metal Chemical Analysismentioning

confidence: 98%

Evaluating adsorbent properties of drinking water treatment plant sludge-based carbons activated by K2CO3/CH3COOH: a low-cost material for metal ion remediation

et al. 2019

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Sludge reclaimed from drinking water treatment plant was carbonized and chemically activated by K 2 CO 3 and CH 3 COOH. The proposal was to evaluate its adsorbent properties as a low-cost alternative material for metal ion remediation. Morphological, physicochemical, and chemical characteristics have been presented and comprehensively discussed. Main findings revealed a surface area rich in mesopores and loaded with weakly acidic functional groups, also presenting an eroded aspect. Carbonization of the sludge's organic content increased the concentration of nitrogenic and oxygenated functional surface groups. Chemical activation by K 2 CO 3 and CH 3 COOH increased adsorption and desorption capacity, pore volume, and pore size by two, three, and over tenfolds, respectively. Uptake of cations increased by 51% and, for anions, around 27%. Association of carbonization with sequenced activation processes converted drinking water treatment plant sludge into an excellent and promising alternative adsorbent material. and activation is available on the literature. Considering the lack of studies regarding the production of activated carbons from DWTP sludge, this study reports the conversion of this widely available feedstock through carbonization and chemical activation.Activated carbons (AC) are scientifically known for having high sorption capacity for different types of chemical species [28], a characteristic of an adsorbent material with large surface area, porous structure, and chemically active surface [29]. Additionally, the high concentration of metals in raw water treatment sludge and, consequently, in its char, may also improve ion-solution interaction. Activated carbons usually have their surface functional groups bonded to complex aromatic rings, behaving similarly to aromatic hydrocarbons [30]. As so, a thermochemical modification would then improve these characteristics in the AC's surface chemistry, as a function of the usage purpose. Overall, the chemical activation of carbonized materials'

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Synthesis and characterization of microporous activated carbon from coffee grounds using potassium hydroxides

Cited by 141 publications

References 36 publications

Fabrication of cotton textile waste-based magnetic activated carbon using FeCl₃ activation by the Box–Behnken design: optimization and characteristics

Fabrication of cotton textile waste-based magnetic activated carbon using FeCl₃ activation by the Box–Behnken design: optimization and characteristics

Extraction of Polyphenols and Synthesis of New Activated Carbon from Spent Coffee Grounds

Evaluating adsorbent properties of drinking water treatment plant sludge-based carbons activated by K2CO3/CH3COOH: a low-cost material for metal ion remediation

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Synthesis and characterization of microporous activated carbon from coffee grounds using potassium hydroxides

Cited by 141 publications

References 36 publications

Fabrication of cotton textile waste-based magnetic activated carbon using FeCl3 activation by the Box–Behnken design: optimization and characteristics

Fabrication of cotton textile waste-based magnetic activated carbon using FeCl3 activation by the Box–Behnken design: optimization and characteristics

Extraction of Polyphenols and Synthesis of New Activated Carbon from Spent Coffee Grounds

Evaluating adsorbent properties of drinking water treatment plant sludge-based carbons activated by K2CO3/CH3COOH: a low-cost material for metal ion remediation

Contact Info

Product

Resources

About

Fabrication of cotton textile waste-based magnetic activated carbon using FeCl₃ activation by the Box–Behnken design: optimization and characteristics

Fabrication of cotton textile waste-based magnetic activated carbon using FeCl₃ activation by the Box–Behnken design: optimization and characteristics