KOH-super activated carbon from biomass waste: Insights into the paracetamol adsorption mechanism and thermal regeneration cycles

Spessato, Lucas; Bedin, Karen C.; Cazetta, André L.; Souza, Isis P.A.F.; Duarte, Vitor Anthony; Crespo, Lucas H.S.; Silva, Marcela C.; Pontes, Rodrigo M.; Almeida, Vitor C.

doi:10.1016/j.jhazmat.2019.02.102

Cited by 188 publications

(32 citation statements)

References 40 publications

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“…Those researcher groups also found a decrease in the adsorption of Cu by biochar after oxidation, attributing the effect to the addition of functional groups and the decrease in the surface area. In this work, the biochar aging process contributed to the significant increase in its adsorption capacity, these results are in agreement with the results obtained by other researchers, who state that during the carbon oxidation process, functional groups (carboxylates, phenols and CO bonds) are inserted on the surface of the material, which implies increasing its adsorption capacity, due to increased electrostatic attraction, caused by increased total surface acidity of the material (Güzel et al, 2017;Spessato et al, 2019;Eeshwarasinghe et al, 2019).…”

Section: /13supporting

confidence: 92%

Efficiency of H2O2-treated eucalyptus biochar on the removal of Cu(II), Cd(II) and Ni(II) from aqueous solution

Souza

Pimenta

Silva

et al. 2020

Agraria

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The present work had the goal to produce H 2 O 2 -treated biochar from eucalyptus wood and testing its efficiency in the removal of heavy metals from aqueous solutions. Oxidizing treatment was performed by reacting biochar with H 2 O 2 (10% m/m) during 4 hours at pH 8.0 and 80 °C. Fresh and H 2 O 2 -treated biochar samples were characterized by thermogravimetry and elemental analysis. Point of zero charge and specific surface area were determined. Adsorption kinetics tests with Cu were carried out and Langmuir and Freundlich isotherms were adjusted. Adsorption tests were conducted with a mixture of Cu, Ni and Cd cations in aqueous solution. The best adsorption capacity was achieved in acid pH. H 2 O 2 -treated biochar had adsorption capacity of 170.41 mg L -1 for Cu alone and 305.35 mg L -1 for the mixture of metals. Adsorption was best predicted by the Langmuir isotherm (R 2 = 0.9976). Despite the significant decrease in the specific surface area, the H 2 O 2 -treated biochar showed better performance in the adsorption of heavy metals compared to the original biochar, especially in the presence of more than one metallic cation.

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Section: /13supporting

confidence: 92%

Efficiency of H2O2-treated eucalyptus biochar on the removal of Cu(II), Cd(II) and Ni(II) from aqueous solution

Souza

Pimenta

Silva

et al. 2020

Agraria

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“…Considering the economy and environmental friendliness, the effective regeneration and stable adsorption performance of the adsorbent are important parameters for the wide application of the adsorbent in the adsorption process (Spessato et al 2019). The regeneration of AF 5 is achieved through a lye elution at room temperature for 3 h, using 4 wt% of NaOH as the eluent.…”

Section: Adsorption Regeneration Experimentsmentioning

confidence: 99%

Efficient removal of acetic acid by a regenerable resin-based spherical activated carbon

Sun

Zhao

et al. 2021

Water Science and Technology

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Carboxylic acids are the main pollutant of industrial wastewater during the Advanced Oxidation Process (AOPs). In this study, we here study a resin-based spherical activated carbon (RSAC, AF5) as an adsorbent and use acetic acid as a model substrate for adsorption investigation. The pH = 3, temperature = 298 K were fixed by batch technique. The pseudo-second-order kinetic model, the intraparticle and external models are fitted well, and it was found that the adsorption of acetic acid onto AF5 was controlled by liquid film diffusion. Freundlich model indicates the adsorption process is heterogeneous multi-molecular layer adsorption on the surface. AF5 shows good regenerative ability; the recovery rate of adsorption capacity is ∼88% after 5 cycles. And COD adsorption removal rate can be maintained 100% for over 35 h in an actual AOPs effluent, and it can be eluted for 100% after 8 h by 0.8wt% NaOH. The characterizations, including XRF, XRD, TG/DSC,FTIR, SEM and N2 adsorption, show that the excellent adsorption performance is mainly due to the microporous structure and large specific surface area (1,512.88 m2/g), the adsorption mechanism mainly including pore filling effect and electrostatic attraction. After five adsorption-recycles, AF5's pore characteristic does not change significantly. This study provided a scientific basis for the wastewater standard discharge process of AOPs coupled adsorption.

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“…Pore size of activated carbon was small and was mainly made up of micropores. Iodine value was related to development of micropores [ 8 ], which also showed that the development of micropores in activated carbon was better than that of pyrolytic carbon. Surface appearance of pyrolytic carbon and activated carbon was analyzed, respectively, under the scanning electron microscope (SEM).…”

Section: Resultsmentioning

confidence: 99%

Study on Reutilization of Pyrolytic Residues of Oily Sludge

Tang

Guan

2020

International Journal of Analytical Chemistry

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Pyrolytic residues of oily sludge are a kind of hazardous solid waste produced by high-temperature pyrolysis of oily sludge, which still contains a certain amount of mineral oil; improper disposal can cause secondary pollution. In order to reutilize the pyrolytic residues of oily sludge, the pyrolytic carbon in pyrolytic residues is recovered by a combination of physical flotation and chemical separation, and they are used for the treatment of oilfield wastewater and adsorption of oil. The results showed that the purity of the pyrolytic carbon is 95.93%; many pores of different sizes are distributed on the surface, with mainly mesoporous distribution. Specific surface area, pore volume, and average pore diameter reach 454.47 m2/g, 0.61 cm3/g, and 6.91 nm, respectively. Adsorption effect of pyrolytic carbon on COD and oil in oilfield wastewater is better than that of activated carbon at the same condition. With regard to adsorption on diesel and crude oil, the initial instantaneous adsorption rate of pyrolytic carbon is 3.8 times and 1.86 times faster than that of activated carbon, respectively. When pyrolytic carbon reaches saturated adsorption, cumulative adsorption of activated carbon on diesel and crude oil is much lower than that of pyrolytic carbon.

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KOH-super activated carbon from biomass waste: Insights into the paracetamol adsorption mechanism and thermal regeneration cycles

Cited by 188 publications

References 40 publications

Efficiency of H2O2-treated eucalyptus biochar on the removal of Cu(II), Cd(II) and Ni(II) from aqueous solution

Efficiency of H2O2-treated eucalyptus biochar on the removal of Cu(II), Cd(II) and Ni(II) from aqueous solution

Efficient removal of acetic acid by a regenerable resin-based spherical activated carbon

Study on Reutilization of Pyrolytic Residues of Oily Sludge

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