Aplicação De Carvão Ativado De Bagaço De Cana-De-Açúcar Na Adsorção De Cd(ii) E Cu(ii)

Abreu, Marcela Breves de; Andrade, João Carlos de; Turbiani, Franciele Rezende Barboza; Gimenes, Marcelino Luiz; Machado, Nádia Regina Camargo Fernandes; Seixas, Fernanda Lini

doi:10.5151/enemp2015-ps-749

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…When analyzing the coefficients of determination (R 2 ), the treated sugarcane bagasse (SB NaOH ) showed better fit in Langmuir isotherm, where the herbicide molecules are adsorbed in monolayer. That result corroborate with the experiments of ABREU et al [58] with sugarcane biochar for the adsorption of Cadmium (Cd), and CARVALHO et al [59] who studied orange peel biochar for tetracycline removal. Analyzing the SB NaOH for the Langmuir model was noticed that the maximum adsorbed amount in the experiment (Table 2) was 13.720 mg.g -1 while the R L factor (separation factor at 100 mg.L -1 ) was 0.767 mgL -1 indicating that adsorption was favorable (0 <R L <1) that is the adsorbate prefer the solid phase than the liquid [47].…”

Section: Resultssupporting

confidence: 89%

Chemical treatment of sugarcane bagasse and its influence on glyphosate adsorption

et al. 2022

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Due to the production rates of sugarcane, nowadays, the sugarcane bagasse stemming in the sugar and alcohol industry is the agro-industrial waste produced in greater volume throughout in Brazil. In 2019, about 192 million tons of this waste were generated. The use of this waste has been the aim of researches around the world, with emphasis on applications that aim to meet the prerogatives of the concept of circular economy. Within this scenario, sugarcane bagasse (SB) was treated in an alkaline medium, forming an adsorbent material, SBNaOH. The effects of chemical treatment were evaluated for surface properties and for glyphosate removal in an aqueous medium. The adsorptive phenomenon was studied through isotherm tests. The results obtained were fitted to classical models of Langmuir, Freundlich and Dubinin-Radushkevich. The characterization indicated that the chemical treatment promoted an important change in the surface of the residue, increasing the surface area. SB and SBNAOH had a feasible behavior as adsorbent and good performance in the removal of the herbicide, presenting values greater than 65% of under all working conditions. The theoretical adsorption saturation governed by Dubinin-Radushkevich (qS) was in the order of 8.988 mg/g (R2=0.988) for SB at 120 minutes of contact and maximum adsorption capacity by Langmuir (Qmax) was 13.720 mg/g (R2=0.984) for SBNaOH at 40 minutes of contact. The process was governed by the exchange or sharing of electrons. The adsorbate is distributed heterogeneously on the SB surface, justifying the presence of active sites with greater ionic strength, and homogeneously on the SBNaOH surface (monolayer). In general, the treated sugarcane bagasse, coming from an agro-industrial residue, proved to be an alternative and promising biosorbent for the removal of glyphosate from aqueous systems, thus generating a new application of this residue.

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Section: Resultssupporting

confidence: 89%

Chemical treatment of sugarcane bagasse and its influence on glyphosate adsorption

et al. 2022

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“…The raw biochar has a basic nature (9.5) and the activated biochar has a slightly acidic nature (4.7). Abreu et al, [35] obtained similar pH values for activated charcoal from sugarcane bagasse (4.62). Coals of an acidic nature have the potential to adsorb protons.…”

Section: Biocharmentioning

confidence: 73%

Utilization of pequi Residual Biomass from the Brazilian cerrado for obtaining raw and activated biochars and bio-oil

Brito¹,

Santana²,

Rambo³

et al. 2020

IJAERS

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The pequi (Caryocar brasiliense Camb) is a fruit native to the Cerrado, with a production of 765 tons per year. However, their peels (76% of the fruit) are generally discarded. In this study, the physical-chemical characterization of the biomass of the pequi was carried out and physical activation processes were developed through slow pyrolysis and physical chemical activation with zinc chloride (ZnCl2) to produce bio-based products, including bio-oil (30.5%) and biochar (34%). Analytical techniques, such as mid-infrared spectroscopy, gas chromatography coupled with mass spectrometry, surface area, pore size, approximate and elementary analysis, helped to elucidate, identify and quantify such compounds. The biochars produced showed a low surface area of 30,30 m²/g (BET) and 39.11 m²/g (Langmuir), however the superior calorific power of activated carbon (29.59 kJ.g -1 ) and raw coal (26,92 kJ.g -1 ) highlight the potential of biochar for use as a solid fuel. Bio-oil, on the other hand, presented valuable chemicals in its fraction, such as vaccenic acid (21.23%), palmitic acid (19.73%) and furfural acid (7.04%).

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Aplicação De Carvão Ativado De Bagaço De Cana-De-Açúcar Na Adsorção De Cd(ii) E Cu(ii)

Cited by 2 publications

References 15 publications

Chemical treatment of sugarcane bagasse and its influence on glyphosate adsorption

Chemical treatment of sugarcane bagasse and its influence on glyphosate adsorption

Utilization of pequi Residual Biomass from the Brazilian cerrado for obtaining raw and activated biochars and bio-oil

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