Activated Bio-Carbons Prepared from the Residue of Supercritical Extraction of Raw Plants and Their Application for Removal of Nitrogen Dioxide and Hydrogen Sulfide from the Gas Phase

Bazan-Woźniak, Aleksandra; Nowicki, Piotr; Wolski, Robert; Pietrzak, Robert

doi:10.3390/ma14123192

Cited by 10 publications

(14 citation statements)

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“…These features have ensured that carbonaceous materials have been used for years and that new applications are still being found [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. The number of possible precursors that can be used to produce this type of carbonaceous adsorbents is also increasing [ 18 , 19 , 20 , 21 , 22 , 23 ]. The rapid development of industry and ongoing urbanization, the increasing amount of chemicals and exhausted gases emitted to water, atmosphere and soil, as well as the ecological aspects that are so important nowadays, are an inspiration to look for new solutions in this field.…”

Section: Introductionmentioning

confidence: 99%

Biochars and Activated Biocarbons Prepared via Conventional Pyrolysis and Chemical or Physical Activation of Mugwort Herb as Potential Adsorbents and Renewable Fuels

et al. 2022

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The main objective of this study was to prepare a series of biochars and activated biocarbons via conventional pyrolysis as well as chemical or physical activation of solid residue after solvent extraction of wild growing plant (popular weed)–mugwort. The influence of the variant of the thermochemical treatment of the precursor on such parameters as elemental composition, textural parameters, acidic-basic character of the surface as well as adsorption abilities of the prepared carbonaceous materials was checked. Moreover, the suitability of the biochars prepared as renewable fuels was also investigated. It has been shown that the products obtained from the mugwort stems differ in many respects from the analogous materials obtained from mugwort leaves. The products were micro/mesoporous materials with surface area reaching 974.4 m2/g and total pore volume–1.190 cm3/g. Surface characterization showed that chemical activation with H3PO4 results in the acidic character of the adsorbents surface, whereas products of pyrolysis and especially physical activation show strongly alkaline surface properties. All the adsorbents were used for methylene blue and iodine adsorption from the aquatic environment. To understand the nature of the sorption process, the Langmuir, Freundlich and Temkin isotherm models were employed. The Langmuir model best described the experimental results, and the maximum sorption capacity calculated for this model reached 164.14 mg of methylene blue per gram of adsorbent. In case of iodine removal, the maximum capacity reached 948.00 mg/g. The research carried out for the biochars prepared via conventional pyrolysis showed that the value of their heat of combustion varies in the range from 21.74 to 30.27 MJ/kg, so they can be applied as the renewable fuels.

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Section: Introductionmentioning

confidence: 99%

Biochars and Activated Biocarbons Prepared via Conventional Pyrolysis and Chemical or Physical Activation of Mugwort Herb as Potential Adsorbents and Renewable Fuels

et al. 2022

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Section: Resultsmentioning

confidence: 52%

“…The biocarbons obtained in this study show higher sorption capacities towards H 2 S than the other biomaterials investigated earlier by our group ( Table 9 ) [ 46 ]. The biocarbons obtained by physical activation of the residues of supercritical extraction of marigold flowers and hop cones [ 46 ] were able to adsorb 29.6 and 17.1 mg H 2 S, respectively. The measurements were made in the mix wet conditions, so at first, the samples were wetted for 30 min in a stream of air of 70% humidity and then adsorption of H 2 S was carried out in wet conditions.…”

Section: Resultsmentioning

confidence: 52%

Microporous Biocarbons Derived from Inonotus obliquus Mushroom and Their Application in the Removal of Liquid and Gaseous Impurities

Bazan-Woźniak

Cielecka‐Piontek

Nosal‐Wiercińska

et al. 2022

IJMS

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Biocarbons were obtained by physical and chemical activation of the residue of the extraction of chaga fungi (Inonotus obliquus). The residue was subjected to heat treatment carried out in a microwave oven and in a quartz tubular reactor. The materials were characterized by elemental analysis, low-temperature nitrogen adsorption, determination of pH, and the contents of acidic and basic oxygen functional groups on the surface of biocarbons by the Boehm method. The final biocarbon adsorbents have surface areas varying from 521–1004 m2/g. The physical activation of the precursor led to a strongly basic character of the surface. Chemical activation of Inonotus obliquus promoted the generation of acid functional groups. All biocarbons were used for methyl red sodium salt adsorption from the liquid phase. The sorption capacities of biocarbons towards the organic dye studied varied from 77 to 158 mg/g. The Langmuir model was found to better describe the experimental results. The results of the kinetic analysis showed that the adsorption of methyl red sodium salt on the biocarbons followed the pseudo-second-order model. The acidic environment was conducive to the adsorption of the dye on the obtained biocarbons. Moreover, thermodynamic studies confirmed that the organic dye adsorption on the biocarbons was a spontaneous endothermic process. The biocarbons obtained were also tested as adsorbents of hydrogen sulfide in dry and wet conditions. The sorption capacities towards hydrogen sulfide varied in the range of 21.9–77.9 mg. The results have shown that the adsorption of hydrogen sulfide depends on the process conditions and the activation procedure of biocarbons (method of activation and thermochemical treatment of samples). It has been shown that the initial material used can be a new precursor for obtaining cheap and—more importantly—universal bioadsorbents characterized by high effectiveness in the removal of air and water pollutants.

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“…As far as copper species are concerned, in the solutions of pH close to 6, the dominant species are Cu 2+ ions, whereas in the pH range between 6 and 10, cationic species like CuOH + and Cu(OH) 2 2+ are observed [29]. At higher pH values (7)(8)(9)(10)(11)(12), precipitation of copper(II) hydroxide takes place, while at pH above 9, anionic forms, i.e., Cu(OH) 3 − and Cu(OH) 4 2− , are also possible. In our experiment, the initial water solutions of pH higher than 6 grew increasingly turbid with increasing pH; moreover, in the neutral and basic environments, a sediment appeared on the bottom of the flask.…”

Section: The Effect Of Ph On Metal Adsorption From One-and Two-component Solutionsmentioning

confidence: 99%

“…Phosphorus-enriched carbon materials show excellent cation-exchanging properties. In turn, nitrogen-doped activated carbons are very effective in H 2 S, SO 2 , CO 2 , NO 2 , or VOCs' removal from gas stream as well as in the removal of copper and lead ions, amines, phenol, and its derivatives' adsorption from aqueous solutions [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Removal of Heavy Metal Ions from One- and Two-Component Solutions via Adsorption on N-Doped Activated Carbon

et al. 2021

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This paper deals with the adsorption of heavy metal ions (Cu2+ and Zn2+) on the carbonaceous materials obtained by chemical activation and ammoxidation of Polish brown coal. The effects of phase contact time, initial metal ion concentration, solution pH, and temperature, as well as the presence of competitive ions in solution, on the adsorption capacity of activated carbons were examined. It has been shown that the sample modified by introduction of nitrogen functional groups into carbon structure exhibits a greater ability to uptake heavy metals than unmodified activated carbon. It has also been found that the adsorption capacity increases with the increasing initial concentration of the solution and the phase contact time. The maximum adsorption was found at pH = 8.0 for Cu(II) and pH = 6.0 for Zn(II). For all samples, better fit to the experimental data was obtained with a Langmuir isotherm than a Freundlich one. A better fit of the kinetic data was achieved using the pseudo-second order model.

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Activated Bio-Carbons Prepared from the Residue of Supercritical Extraction of Raw Plants and Their Application for Removal of Nitrogen Dioxide and Hydrogen Sulfide from the Gas Phase

Cited by 10 publications

References 48 publications

Biochars and Activated Biocarbons Prepared via Conventional Pyrolysis and Chemical or Physical Activation of Mugwort Herb as Potential Adsorbents and Renewable Fuels

Biochars and Activated Biocarbons Prepared via Conventional Pyrolysis and Chemical or Physical Activation of Mugwort Herb as Potential Adsorbents and Renewable Fuels

Microporous Biocarbons Derived from Inonotus obliquus Mushroom and Their Application in the Removal of Liquid and Gaseous Impurities

Removal of Heavy Metal Ions from One- and Two-Component Solutions via Adsorption on N-Doped Activated Carbon

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