Valorization of coffee grounds into activated carbon using physic—chemical activation by KOH/CO 2

Laksaci, Hamza; Khelifi, A.; Belhamdi, Badreddine; Trari, M.

doi:10.1016/j.jece.2017.09.036

Cited by 43 publications

(35 citation statements)

References 29 publications

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“…This improves the microporosity of the activated carbon and increases the adsorption for large organic molecules. The results showed that MB adsorbs better than phenol with adsorption capacities of 390 and 211 mg/g, respectively [136].…”

Section: Timementioning

confidence: 99%

“…These materials include a wide range of carbonaceous substances with different properties and characteristics (porosity, specific surface, chemical nature of the surface, density, etc.). Activated carbon can be produced from any substance with a high carbon content, whether of a vegetable, fossil, or material of a synthetic nature; examples include date stones [134,135], coffee grounds [133,136,137], almond shell [138], coconut shell [139], corncob wastes [140], Acacia glauca sawdust [141], waste potato residue [142,143], rice husk [144], sunflower piths [145], tomato stem [146], banana peel [147], etc.…”

Section: Activated Carbonmentioning

confidence: 99%

“…The results showed that these pollutants were better adsorbed on the activated carbon obtained with KOH, which has a microporosity and a specific surface area greater than that obtained with K 2 CO 3 [206]. In the same context, Laksaci et al [136] studied the influence of the combination of CO 2 with KOH on the morphological properties and the sorption capacities of adsorbents from coffee grounds for phenol and MB. Activation by KOH under CO 2 flow considerably improves the porous structure of the adsorbents.…”

Section: Timementioning

confidence: 99%

“…Activation by KOH under CO 2 flow considerably improves the porous structure of the adsorbents. Indeed, the use of CO 2 makes it possible to increase the diameter of the pores and develop a narrow distribution of the size of the pores [136]. This improves the microporosity of the activated carbon and increases the adsorption for large organic molecules.…”

Section: Timementioning

confidence: 99%

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Current State of Porous Carbon for Wastewater Treatment

et al. 2020

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Porous materials constitute an attractive research field due to their high specific surfaces; high chemical stabilities; abundant pores; special electrical, optical, thermal, and mechanical properties; and their often higher reactivities. These materials are currently generating a great deal of enthusiasm, and they have been used in large and diverse applications, such as those relating to sensors and biosensors, catalysis and biocatalysis, separation and purification techniques, acoustic and electrical insulation, transport gas or charged species, drug delivery, and electrochemistry. Porous carbons are an important class of porous materials that have grown rapidly in recent years. They have the advantages of a tunable pore structure, good physical and chemical stability, a variable specific surface, and the possibility of easy functionalization. This gives them new properties and allows them to improve their performance for a given application. This review paper intends to understand how porous carbons involve the removal of pollutants from water, e.g., heavy metal ions, dyes, and organic or inorganic molecules. First, a general overview description of the different precursors and the manufacturing methods of porous carbons is illustrated. The second part is devoted to reporting some applications such using porous carbon materials as an adsorbent. It appears that the use of porous materials at different scales for these applications is very promising for wastewater treatment industries.

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Section: Timementioning

confidence: 99%

Section: Activated Carbonmentioning

confidence: 99%

Section: Timementioning

confidence: 99%

Section: Timementioning

confidence: 99%

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Current State of Porous Carbon for Wastewater Treatment

et al. 2020

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“…Consequently, the leftover of coffee drink; that is, the coffee residue, is abundantly available. Because it has no commercial value, coffee residue could be a sustainable resource of activated carbon for wastewater treatment (Laksaci et al 2017). Moreover, without proper solid waste management and disposal, the waste material may well lead to other environmental issues.…”

Section: Introductionmentioning

confidence: 99%

Coffee residue-based activated carbons for phenol removal

Palanisami

Azmi

Zaini

et al. 2021

Water Practice and Technology

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This work was aimed to evaluate the adsorptive properties of activated carbons from coffee residue for phenol removal. The coffee residue was activated using H3PO4 and KOH, and the resultant activated carbons were characterized for surface area and functional groups. The values of surface area were recorded as 1,030 m2/g and 399 m2/g for H3PO4- and KOH-activated carbons, respectively. The maximum capacity for phenol removal is comparable for both activated carbons at 43 mg/g. The pores might be inaccessible due to electrostatic repulsion by surface functional groups and hydroxyl anions. The second stage in a two-stage adsorber design is necessary to accomplish the process with high performance and minimum dosage of activated carbon. Coffee residue is a promising activated carbon precursor for phenol removal.

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Modification, Production, and Methods of KOH‐Activated Carbon

2022

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This review covers research on the use of potassium hydroxide (KOH) to produce and modify activated carbon. The methods employed for activation by considering the activation process, carbonization, temperature, activation time, and KOH ratio to material are described and how the surface area, surface morphology, and functional groups are affected by the KOH ratio. Characterization techniques and preparation conditions are summarized. The activated carbon pore structure mainly depends on the burn‐off size and the time for activation is linked to the overall activation reaction rate. The increase in surface area and pore size depends on the ratio of KOH, showing that KOH affects the surface chemistry of the activated carbon. The sorbent‐sorbate interactions are strongly influenced by different parameters, which were also calculated in this review and used to evaluate such interactions.

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Valorization of coffee grounds into activated carbon using physic—chemical activation by KOH/CO 2

Cited by 43 publications

References 29 publications

Current State of Porous Carbon for Wastewater Treatment

Current State of Porous Carbon for Wastewater Treatment

Coffee residue-based activated carbons for phenol removal

Modification, Production, and Methods of KOH‐Activated Carbon

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