Dysprosium Removal from Water Using Active Carbons Obtained from Spent Coffee Ground

Alcaraz, Lorena; Escudero, María Esther; Llorente, Irene; Urbieta, A.; Fernández, Paloma; López, Félix A.

doi:10.20944/preprints201908.0076.v1

Cited by 13 publications

(2 citation statements)

References 20 publications

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“…Among all the potential uses of activated carbons, such as catalyst or catalyst support [Sadashiv Bubanale and Shivashankar, 2017 ], pollutant adsorption (Alguacil et al, 2018 ; Alcaraz et al, 2019 , 2020 ), or hydrogen production (Tsyntsarski et al, 2015 ; Prabu et al, 2019 ), their application in energy storage as electrodes for electrochemical double-layer capacitors (EDLCs) (Chang and Zainal, 2019 ) has attracted an immense interest from the scientific community.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED: Activated Carbons From Winemaking Biowastes for Electrochemical Double-Layer Capacitors

et al. 2020

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Revalorizing organic biowaste is critical to achieve a full circular economy, where waste is transformed into resources. One of the main strategies is to produce activated carbons and use them as functional materials for electrochemical energy storage. In this study, winemaking wastes, bagasse (BAG), and cluster stalks (CS) were recovered and used in the preparation of activated carbons by a hydrothermal process. Then, they were chemically activated using KOH and investigated for electrochemical capacitor applications. The activation treatment resulted in microporous structures, characterized by a type I isotherm for low partial pressures (P/P 0), and a type IV for higher pressures, as observed by Brunauer-Emmett-Teller surface analysis, with specific surfaces of 1,861 and 2,662 m 2 •g −1 for BAG and CS, respectively. These microporous structures were also investigated by means of scanning electron microscopy, revealing a high porous degree. Micro-Raman spectroscopy and X-ray photoelectron spectroscopy measurements displayed bands associated to disorder of the structure of the carbonaceous material. The electrochemical performance of the resulting materials was investigated for electrochemical energy storage applications, as supercapacitor electrode, in 1 M KOH aqueous electrolyte. These biowaste-derived materials displayed electrochemical double-layer capacitance, with 129 F•g −1 at 10 A•g −1 in the 0.1 to −1.0 V vs. saturated calomel electrode. For that reason, they are pinpointed as potential negative electrodes for electrochemical double-layer supercapacitors and hybrid or asymmetric supercapacitors.

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Section: Introductionmentioning

confidence: 99%

RETRACTED: Activated Carbons From Winemaking Biowastes for Electrochemical Double-Layer Capacitors

et al. 2020

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“…It influences the characteristics of activated carbon, depending on the characteristics of biomass used. Several studies conducted one-step activation in which indicating good achievements related to the pore characteristics of activated carbon (16,17). Moreover, KOH as an activator has been highly used due to its strong basic properties to produce incredible surface area in line with the increase of temperature of carbonisation (18).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of potassium hydroxide-treated activated carbon via one-step activation method

Harimisa

Jusoh

Tan

et al. 2022

J. Phys.: Conf. Ser.

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Physicochemical activation has been popular currently due to the incredible surface area of activated carbon produced. In the process, the step of activation has a significant role in influencing the characteristics of activated carbon. Previously, several studies conducted one-step activation in which potassium hydroxide (KOH) was impregnated with the precursors derived from agricultural biomass and wastes. Currently, the materials have been interesting due to their renewable and low-cost properties. This paper reviews the recent studies regarding the variables and the effect of one-step activation towards properties of KOH-impregnated adsorbents which were synthesized from agricultural biomass and wastes. The variables of one-step activation and pore development are compared in this paper. It was found that the increase of pore characteristics follows the increased amount of KOH concentration, ratio, carbonizing temperature and time until reaching the optimum level of variables. One-step activation has been proved by the studies to the successful activation of activated carbon with different excellent surface area, even up to approximately 2800 m2/g. In the future, it will be a great challenge to develop the efficient processes of synthesizing activated carbon with improved optimization to achieve incredible and maximum results of the surface area.

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Graphene oxide and polyethyleneimine cooperative construct ionic imprinted cellulose nanocrystal aerogel for selective adsorption of Dy(III)

Zheng

Sun

et al. 2021

Cellulose

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Because of dysprosium's unique physical and chemical properties and limited supply, the price of rare earth dysprosium has been high in recent years. Therefore, the study of the method of high e ciency selective separation of dysprosium has the double value of scienti c research and practical economy. In this paper, we used periodic cellulose nanocrystals as the basic structure, polyethylenimine and graphene oxide were introduced, combined with imprinting technology, to construct porous imprinted aerogel and use it for selective adsorption of Dy(III). The physical and chemical properties were characterized by SEM, TEM, FT-IR and TGA. It was proved that both polyethylenimine and graphene oxide were crosslinked effectively with cellulose nanocrystals. Adsorption experiments showed that the composite imprinted aerogel could selectively adsorb dysprosium effectively, and the maximum adsorption capacity for Dy(III) was 36.495 mg g − 1 . The reproducibility experiment showed that aerogel had good regeneration ability. In conclusion, cellulose nanocrystals aerogel, which is environmentally friendly, e cient and repeatable, is expected to provide a new direction for the recovery of rare earth elements.

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Dysprosium Removal from Water Using Active Carbons Obtained from Spent Coffee Ground

Cited by 13 publications

References 20 publications

RETRACTED: Activated Carbons From Winemaking Biowastes for Electrochemical Double-Layer Capacitors

RETRACTED: Activated Carbons From Winemaking Biowastes for Electrochemical Double-Layer Capacitors

Synthesis of potassium hydroxide-treated activated carbon via one-step activation method

Graphene oxide and polyethyleneimine cooperative construct ionic imprinted cellulose nanocrystal aerogel for selective adsorption of Dy(III)

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