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<p>This work reports the use of wood wastes (WWs) to generate clean energy through gasification. WW chips were fed into two gasifiers, which generated 24.7 kWe and 1.2 kWe of electrical energy. Each gasifier generated synthesis gas (CO + H<sub>2</sub>) and biochar as solid residue. Furthermore, biochar samples were employed as low-cost adsorbent for textile dyes and were characterized through porosity (BET), scanning electron microscopy (SEM), thermogravimetry (TGA), infrared spectroscopy (FTIR), X-ray diffraction, and point of zero charge techniques. Biochar morphological structure exhibited a great uniformity, as seen in SEM images. Porosity assessment showed that specific surface area was 403.77 m<sup>2</sup>/g, 538.90 m<sup>2</sup>/g, and 506.71 m<sup>2</sup>/g for the three biochar samples, and the average pore diameter was 25.0&#xa0;Å. A 2<sup>2</sup> factorial planning was carried out to investigate the effects of agitation velocity and particle size over the adsorption of methylene blue dye. Kinetic studies were carried out, and the constant rate for pseudo-second-order model ranged from 0.08 to 0.54&#xa0;g/mg/min. Equilibrium experiments were performed and the maximum adsorption capacity for the three biochar samples were 337.25&#xa0;mg/g, 291.14&#xa0;mg/g, and 1478.00&#xa0;mg/g in agreement with Langmuir isotherm. Real textile wastewater was collected from laundry effluent and its fate after adsorption onto the three samples of biochars was analyzed through phytotoxicity assessment, which showed germination index varying from 50 to 98%. Therefore, the results were very promising for wood residue biochars, with maximum adsorption capacity similarly to commercial activated carbon (192&#xa0;mg/g).</p> Graphical Abstract <p></p>

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The fate of wood wastes: from the gasification and its application as adsorbent of textile pollutants

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • Luiz Martins Pereira Neto,
  • Tiago José Marques Fraga,
  • Maryne Patrícia da Silva,
  • Fernando Cartaxo Rolim Neto,
  • Maurício Alves da Motta Sobrinho

摘要

This work reports the use of wood wastes (WWs) to generate clean energy through gasification. WW chips were fed into two gasifiers, which generated 24.7 kWe and 1.2 kWe of electrical energy. Each gasifier generated synthesis gas (CO + H2) and biochar as solid residue. Furthermore, biochar samples were employed as low-cost adsorbent for textile dyes and were characterized through porosity (BET), scanning electron microscopy (SEM), thermogravimetry (TGA), infrared spectroscopy (FTIR), X-ray diffraction, and point of zero charge techniques. Biochar morphological structure exhibited a great uniformity, as seen in SEM images. Porosity assessment showed that specific surface area was 403.77 m2/g, 538.90 m2/g, and 506.71 m2/g for the three biochar samples, and the average pore diameter was 25.0 Å. A 22 factorial planning was carried out to investigate the effects of agitation velocity and particle size over the adsorption of methylene blue dye. Kinetic studies were carried out, and the constant rate for pseudo-second-order model ranged from 0.08 to 0.54 g/mg/min. Equilibrium experiments were performed and the maximum adsorption capacity for the three biochar samples were 337.25 mg/g, 291.14 mg/g, and 1478.00 mg/g in agreement with Langmuir isotherm. Real textile wastewater was collected from laundry effluent and its fate after adsorption onto the three samples of biochars was analyzed through phytotoxicity assessment, which showed germination index varying from 50 to 98%. Therefore, the results were very promising for wood residue biochars, with maximum adsorption capacity similarly to commercial activated carbon (192 mg/g).

Graphical Abstract