Adsorption of Cadmium Using Biochars Produced from Agro-Residues

López, Julián E.; Builes, Santiago; Salgado, Mario A. Heredia; Tarelho, L.A.C.; Arroyave, Catalina; Aristizábal, Adriana; Chávez, Eduardo Somarriba

doi:10.1021/acs.jpcc.0c02216

Cited by 41 publications

(46 citation statements)

References 67 publications

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“…A significant reduction of uranium (U(VI)) in aqueous solution employing biochar, produced at 850 °C from coffee espresso waste, was observed by Paschalidou et al (2020). López et al (2020) evaluated biochar produced at 550 °C from coffee husks and verified the immobilization of Cd in aqueous solution mainly due to the effect of precipitation. Chwastowski et al (2020) observed the efficiency of SCG biochar in the removal of Mn, Pb and Cd from aqueous solutions, which was more significant than that obtained for raw biomass.…”

Section: Soil and Plant Nutrition Articlementioning

confidence: 93%

Cadmium and lead adsorption and desorption by coffee waste-derived biochars

et al. 2022

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Biochar derived from coffee waste has been reported as a promising material for heavy metal sorption. However, if the intended use is environmental remediation, knowing the extent to which desorption may occur is critical. Thus, the objective of this work was to evaluate the efficiency of spent coffee ground (SCG) and coffee parchment (CP) biochars pyrolyzed at 700 °C under laboratory conditions, in the sorption of Cd and Pb from aqueous solutions, in a pH range from 2 to 10, and their retention after an induced desorption process with a 2.9 pH acetic acid solution. Both biochars were alkaline, and the initial pH of the solution had a large effect on the sorption capacity of SCG but a small effect on the sorption capacity of CP. The Pb sorption capacity was higher for CP (18.6 mg•g -1 ) than for SCG (11.4 mg•g -1 ), while both biochars had low Cd retention capacities (1.18 mg•g -1 ). Coffee parchment also showed the highest Pb retention (30% to 87%), while for Cd there was no difference between CP and SCG biochars. Our results showed that metal precipitation was the main mechanism for metal immobilization and CP biochar proved to be more reliable than SCG, mainly for Pb, due to its higher sorption capacity and lower metal release by desorption than SCG. These characteristics are particularly important for the use of biochar in environmental remediation.Besides that, the biochar production represents an eco-friendly destination for these feedstocks, contributing to the circular economy.

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Section: Soil and Plant Nutrition Articlementioning

confidence: 93%

Cadmium and lead adsorption and desorption by coffee waste-derived biochars

et al. 2022

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“…Lignocellulosic biomass is a residue of agro-industrial activities that has aroused great interest in the development of new adsorbent materials, precisely because of its large quantity and availability. Lignocellulosic waste, such as rice husk [9], palm fiber [10], and sugarcane biomass (SCB) [11], has been used for the production of adsorbent materials as well as activated carbon [12,13] and biochar (BC) [14][15][16]. BC is a product of the thermochemical transformation of lignocellulosic biomass, heated in a closed system with limited oxygen [17], and have been employed in the removal of organic compounds from wastewater, such as dye [18], medicines [19], and pesticides [9].…”

Section: Introductionmentioning

confidence: 99%

How the Carbonization Time of Sugarcane Biomass Affects the Microstructure of Biochar and the Adsorption Process?

Fonseca¹,

Oliveira²,

Martins³

et al. 2022

Sustainability

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Biochars (BCs) are very versatile adsorbents, mainly, in the effectiveness of adsorption of organic and inorganic compounds in aqueous solutions. Here, the sugarcane biomass (SCB) was used to produce biochar at different carbonization times: 1, 2, 3, 4, and 5 h, denominated as BC1, BC2, BC3, BC4, and BC5, respectively. The superficial reactivity was studied with adsorption equilibrium experiments and kinetics models; Methylene Blue (MB) was used as adsorbate at different pH values, concentrations, and temperatures. In summary, the carbonization time provides the increase of superficial area, with exception of BC4, which decreased. Equilibrium studies showed inflection points and fluctuations with different initial dye concentration and temperature; SCB showed the best adsorption capacity compared to the BCs at the three temperatures tested, varying with the increase of MB concentration, suggesting the dependence of these two main factors on the adsorption process. The proposed adsorption mechanism suggests the major influence of Coulomb interactions, H-bonding, and π-interactions on the adsorption of MB onto adsorbents, evidencing that the adsorption is led by physical adsorption. Therefore, the results led to the use of the SCB without carbonization at 200 °C, saving energy and more adsorbent mass, considering that the carbonization influences weight loss. This study has provided insights of the use of SCB in MB dye adsorption as a low-cost and eco-friendly adsorbent.

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“…Biochar is a carbon (C) rich porous material produced by thermochemical break down of organic materials in a low oxygen or anoxic environment, thus preventing combustion ( Lehmann and Joseph 2009 ). Common production methods are gasification, pyrolysis, hydrothermal ( Kwapinski 2019 ) and thermal carbonization ( López et al., 2020 ). All methods require heating of the biomass feedstock.…”

Section: Introductionmentioning

confidence: 99%