Preparação e caracterização de carvão ativado produzido a partir de resíduos do beneficiamento do café

Brum, Sarah Silva; Bianchi, Maria Lúcia; Silva, Vanésia Liane da; Gonçalves, Maraísa; Guerreiro, Mário César; Oliveira, Luiz C.A.

doi:10.1590/s0100-40422008000500019

Cited by 56 publications

(29 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The relative errors between the experimental and predicted values for the carbon yield and MB adsorption capacity are 3.69% and 9.07%, respectively, indicating that the process optimization is sufficiently accurate. The present study shows that ASAC's adsorption capacity for MB (Table 3) is quite remarkable when compared to previously reported adsorbents [11,[21][22][23]. the experimental response of q m values can be seen in Figure 1A and C. The heating time has only a weak effect on MB adsorption capacity.…”

Section: Process Optimizationsupporting

confidence: 63%

Microwave-assisted preparation of almond shell-based activated carbon for methylene blue adsorption

Yang

et al. 2016

Green Processing and Synthesis

View full text Add to dashboard Cite

This study reports the synthesis of a novel adsorbent, hereinafter named almond shell-based activated carbon (ASAC), from waste almond shells (AS) via exposure to microwave radiation and the use of ZnCl 2 as a chemical activator. Synthetic conditions were further elaborated using the response surface methodology to optimize the adsorption capacity of ASAC for methylene blue (MB) dye. The optimized ASAC preparation conditions were found to be as follows: a mass (ZnCl 2 /AS) ratio of 3:1 (w/w) and microwave heating time period of 15 min at 900 W. A maximum ASAC yield of 39.67% and a MB adsorption capacity of 314.20 mg/g were obtained. ASAC was also characterized by N 2 adsorption-desorption measurement, scanning electron microscopy (SEM), Fourier-transform infrared spectrometry (FTIR), X-ray photoelectron spectroscopy (XPS), and point of zero charge measurement. Optimized ASAC had a Brunauer-Emmett-Teller surface area of 839.60 m 2 /g and a total volume of 0.406 cm 3 /g. FTIR and XPS analysis exhibited a decline in oxygen-containing groups of ASAC as compared with AS. The adsorption behavior of ASAC for MB was fitted well to the pseudo-second-order model and the Langmuir isotherm model. These findings support the ease of preparation and cost effectiveness that make ASAC promising for use in environmental remediation.

show abstract

Section: Process Optimizationsupporting

confidence: 63%

Microwave-assisted preparation of almond shell-based activated carbon for methylene blue adsorption

Yang

et al. 2016

Green Processing and Synthesis

View full text Add to dashboard Cite

show abstract

“…The use of the residues in preparation or production of a higher valued material as an alternative transforming waste in raw material. Recently, many studies have reported the production of activated carbon (AC) from residues such as: Rice husk, [6]; Green Coconut Shell, [7];Babassu coconut, [8];Mukah coal, [9]; Residues of babassu, [10]; Coffee waste, [11];Oil palm, [12], etc. Many studies have discussed great potential of lignocellulosic as a renewable feedstock for preparation of Activated Carbon.…”

Section: Introductionmentioning

confidence: 99%

Preparation of activated carbon from babassu endocarpunder microwave radiation by physical activation

Salgado

Abioye

Junoh

et al. 2018

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

Abstract. Babassu endocarp were used to prepare activated carbons by physical activation via microwave radiation for the first time. The pyrolysis temperature was 600°C and the derived biochar were activated in CO 2atmosphere at 700, 750 and 800°C for 30 min. The material was characterized using scanning electron microscopy (SEM). The porous properties of the activated carbons obtained including the Brunauer-Emmett-Teller (BET) surface area, pore volume, and average pore diameter were determined by nitrogen adsorption isotherms at 77.32 K. The experimental results showed that most pores occurred during the activation predominantly as micropores. Endocarp babassu can be used as precursor to produce activated carbon with a rather well-developed porosity by pyrolysis and physical activation by two-steps with CO2 activation via microwaves radiation. The activated carbon, with a low production cost, could be suitable for applications in gaseous pollutant adsorption, adsorb iodine, methylene blue, and residual chlorine.

show abstract

“…In addition, there is an increase in C/H ratio and a decrease in O/C ratio. The C/H increase indicates an increase in condensation and flavoring reactions (BRUM et al, 2008;AVELAR et al, 2010;PEREIRA, 2010;COUTO et al, 2012).…”

Section: Resultsmentioning

confidence: 99%

“…AC is a highly porous carbonaceous material, with an elevated internal surface area and functional groups in its surface with an adsorption affinity for various contaminants. The AC is obtained from a controlled pyrolysis of a raw material, where temperatures vary from 400 to 1000°C (RIBEIRO, 2005;BRUM et al, 2008;AVELAR et al, 2010;COUTO et al, 2012;CARVAJAL-BERNAL et al, 2015;HÚMPOLA et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Activated carbon from bamboo (<i>Bambusa vulgaris</i>) waste using CO2 as activating agent for adsorption of methylene blue and phenol

et al. 2019

Self Cite

View full text Add to dashboard Cite

Activated carbon from bamboo (Bambusa vulgaris) waste using CO 2 as activating agent for adsorption of methylene blue and phenolCarvão ativado a partir de resíduos de bambu (Bambusa vulgaris) utilizando CO 2 como agente ativante para adsorção de azul de metileno e fenol Abstract Bamboo (Bambusa vulgaris) wastes were used as raw material for producing activated carbon. The materials were collected and turned into activated carbons by carbonization (500 °C, 1.67 °C.min -1 , 60 min) and activation (800 °C, 10 °C.min -1 , 60 min) processes with CO 2 (100 mL.min -1 ). The obtained material (CO 2 AC) was characterized by its yield, elemental analysis, ash content, surface area (S BET ), Boehm titration method, scanning electron microscopy and used as adsorbent for removing the methylene blue and phenol contaminants. The Langmuir and Freundlich isotherm models were selected for understanding the adsorption process. CO 2 AC produced showed yield of 21.6%, carbon content of 82.13% and S BET of 856.78 m 2 .g -1 , presenting rapid removal and high adsorption capacity for methylene blue (298.82 mg.g -1 ) and phenol (558.29 mg.g -1 )Santana, G. M.; Trugilho, P. F.; Borges, W. M. S.; Bianchi, M. L.; Paes, J. B.; Nobre, J. R. C.; Morais, R. M. 770

show abstract

Preparação e caracterização de carvão ativado produzido a partir de resíduos do beneficiamento do café

Cited by 56 publications

References 4 publications

Microwave-assisted preparation of almond shell-based activated carbon for methylene blue adsorption

Microwave-assisted preparation of almond shell-based activated carbon for methylene blue adsorption

Preparation of activated carbon from babassu endocarpunder microwave radiation by physical activation

Activated carbon from bamboo (<i>Bambusa vulgaris</i>) waste using CO2 as activating agent for adsorption of methylene blue and phenol

Contact Info

Product

Resources

About