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<p>A&#xa0;convenient method&#xa0;is proposed using a heat-treatable volatile template to prepare hierarchical porous biochar (HPB). <i>Litsea cubeba</i> leaves and ZIF-8 served as carbon source and volatile hard template, respectively. The good compatibility between ZIF-8 and biomass facilitated their uniform dispersion, and the thermal decomposition of ZIF-8 created abundant pores in the HPB. By using ZIF-8 with different sizes as “modulators”, the textural properties of HPB can be controlled. The HPB derived from 200&#xa0;nm-sized ZIF-8 exhibited ultra-high specific surface area, rich macro-meso-micro porous structure, and excellent electrocatalytic activity, which makes HPB-200 an effective electrochemical sensing platform. The sensor demonstrated an ultralow detection limit (0.2&#xa0;nM) of Ponceau 4R, showing significant application potential in the field of electroanalytical sensing.</p> Graphical Abstract <p></p>

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A novel hierarchical porous biochar based on ZIF-8 volatile hard template with high-efficiency electrochemical sensing performance for trace determination of Ponceau 4R

  • 期刊论文

  • 发表日期：

    2025年1月15日

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  • Qi Yu,
  • Jing Zhou,
  • Wenhai Wang,
  • Rumin Fu,
  • Wentao Yan,
  • Hui Chen,
  • Yansha Gao,
  • Guorong Fan,
  • Linyu Wang,
  • Zongde Wang,
  • Limin Lu

摘要

A convenient method is proposed using a heat-treatable volatile template to prepare hierarchical porous biochar (HPB). Litsea cubeba leaves and ZIF-8 served as carbon source and volatile hard template, respectively. The good compatibility between ZIF-8 and biomass facilitated their uniform dispersion, and the thermal decomposition of ZIF-8 created abundant pores in the HPB. By using ZIF-8 with different sizes as “modulators”, the textural properties of HPB can be controlled. The HPB derived from 200 nm-sized ZIF-8 exhibited ultra-high specific surface area, rich macro-meso-micro porous structure, and excellent electrocatalytic activity, which makes HPB-200 an effective electrochemical sensing platform. The sensor demonstrated an ultralow detection limit (0.2 nM) of Ponceau 4R, showing significant application potential in the field of electroanalytical sensing.

Graphical Abstract