Scholarlink

<p>The preparation conditions of magnetic biochar (MBC) significantly influence its performance and application. In this study, MBC with different iron ion loading concentrations (0.2, 0.4, 0.8, and 1.6&#xa0;mol/L, denoted as MBC-1 to MBC-4) was synthesized via the coprecipitation method to investigate the changes in properties and evaluate its effects on sludge anaerobic digestion. The results showed that MBC prepared at iron ion concentrations of 0.8&#xa0;mol/L (MBC-3) and 1.6&#xa0;mol/L (MBC-4) exhibited superior physicochemical properties, including higher specific surface area, larger pore volume, lower impedance, and enhanced electron transfer capability. Anaerobic digestion results indicated that MBC addition significantly enhanced methane production, with cumulative methane yields of MBC-3 and MBC-4 increased by 31% and 36%, respectively, compared to the control. Although the cumulative methane production of the MBC-4 group was slightly higher, a significant increase in iron addition did not bring a significant increase in methane gain. Its electron transfer activity (INT-ETS) did not further enhance with the increase in iron ion loading. Overall, considering material performance, electron transfer efficiency, methane enhancement, and preparation cost, MBC prepared with an iron ion concentration of 0.8&#xa0;mol/L exhibited optimal comprehensive performance and application potential in sludge anaerobic digestion.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Effect of iron ion loading concentration on magnetic biochar from walnut shells to promote anaerobic digestion process of sludge

  • 期刊论文

  • 发表日期：

    2026年2月19日

查看全文
  • Ao Zheng,
  • Juan Mei,
  • Quan Chen,
  • Jiao Wu

摘要

The preparation conditions of magnetic biochar (MBC) significantly influence its performance and application. In this study, MBC with different iron ion loading concentrations (0.2, 0.4, 0.8, and 1.6 mol/L, denoted as MBC-1 to MBC-4) was synthesized via the coprecipitation method to investigate the changes in properties and evaluate its effects on sludge anaerobic digestion. The results showed that MBC prepared at iron ion concentrations of 0.8 mol/L (MBC-3) and 1.6 mol/L (MBC-4) exhibited superior physicochemical properties, including higher specific surface area, larger pore volume, lower impedance, and enhanced electron transfer capability. Anaerobic digestion results indicated that MBC addition significantly enhanced methane production, with cumulative methane yields of MBC-3 and MBC-4 increased by 31% and 36%, respectively, compared to the control. Although the cumulative methane production of the MBC-4 group was slightly higher, a significant increase in iron addition did not bring a significant increase in methane gain. Its electron transfer activity (INT-ETS) did not further enhance with the increase in iron ion loading. Overall, considering material performance, electron transfer efficiency, methane enhancement, and preparation cost, MBC prepared with an iron ion concentration of 0.8 mol/L exhibited optimal comprehensive performance and application potential in sludge anaerobic digestion.