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<p>In this study, the bead-like Fe/chitosan-bentonite adsorbents were prepared from a combination of bentonite and chitosan by phase inversion, followed by different quantities of iron immersion to remove hydrogen sulfide (H<sub>2</sub>S). The beads have been characterized using advanced methods including SEM, EDS, XRD, FTIR, nitrogen adsorption isotherms, and mechanical strength. The H<sub>2</sub>S removal efficiency of the material was investigated in the continuous fixed-bed column system under various temperature conditions, different dosages of used materials, and varying H<sub>2</sub>S concentrations in the gas stream, to assess its potential for biogas purification. The results indicated that the adsorption capacity of Fe/chitosan-bentonite beads impregnated with 0.09&#xa0;M FeCl<sub>3</sub>.6H<sub>2</sub>O solution gradually increased with increasing these parameters and reached the highest of 24.4 mg_H<sub>2</sub>S/g_materials at conditions of 30&#xa0;°C, 0.3&#xa0;g of adsorbents, and 1100&#xa0;ppm H<sub>2</sub>S. Moreover, two procedures used to evaluate the material's regeneration ability include blowing air through the materials and exposing them to air after the samples adsorbed H<sub>2</sub>S. As a result, this material can achieve over 90% regeneration after 12&#xa0;h of continuous air blowing or exposure to air, demonstrating its sustainable application.</p> Graphical abstract <p></p>

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Phase inversion synthesis of Fe/chitosan-bentonite beads for H2S adsorptive removal

  • 期刊论文

  • 发表日期：

    2025年4月11日

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  • Nguyen Manh Hung,
  • Nguyen Thi Truc Phuong,
  • Nguyen Tan Phat,
  • Nguyen Van Dung,
  • Ngo Tran Hoang Duong,
  • Tran Thuy Tuyet Mai,
  • Nguyen Quang Long

摘要

In this study, the bead-like Fe/chitosan-bentonite adsorbents were prepared from a combination of bentonite and chitosan by phase inversion, followed by different quantities of iron immersion to remove hydrogen sulfide (H2S). The beads have been characterized using advanced methods including SEM, EDS, XRD, FTIR, nitrogen adsorption isotherms, and mechanical strength. The H2S removal efficiency of the material was investigated in the continuous fixed-bed column system under various temperature conditions, different dosages of used materials, and varying H2S concentrations in the gas stream, to assess its potential for biogas purification. The results indicated that the adsorption capacity of Fe/chitosan-bentonite beads impregnated with 0.09 M FeCl3.6H2O solution gradually increased with increasing these parameters and reached the highest of 24.4 mg_H2S/g_materials at conditions of 30 °C, 0.3 g of adsorbents, and 1100 ppm H2S. Moreover, two procedures used to evaluate the material's regeneration ability include blowing air through the materials and exposing them to air after the samples adsorbed H2S. As a result, this material can achieve over 90% regeneration after 12 h of continuous air blowing or exposure to air, demonstrating its sustainable application.

Graphical abstract