Scholarlink

<p>Biochar is an efficient and cost–effective material for removing heavy metal pollutants from aqueous systems. In this study, biochar derived from crayfish shells pyrolyzed at 800&#xa0;°C (CBC) exhibited high adsorption capacities for Cd²⁺ (1,152.5&#xa0;mg/g) and Zn²⁺ (1,135.0&#xa0;mg/g), even under competitive binary conditions. BET analysis showed that CBC had a specific surface area of 20.07&#xa0;m²/g, with mesopores accounting for 98.56% of the total pore volume. SEM–EDS analysis revealed a significant decrease in Ca content after adsorption, indicating the involvement of calcium–based components in the removal process. The adsorption process followed pseudo–second–order kinetics and was well described by the Freundlich isotherm model. In the binary system, differences in adsorption behavior between Cd²⁺ and Zn²⁺ were observed, indicating the coexistence of competitive and interactive effects. Comprehensive characterization results (XRD, FTIR, SEM–EDS) suggested that ion exchange and precipitation were the dominant mechanisms, accompanied by contributions from surface complexation. The formation of CdCO₃ and ZnO phases further supported the role of chemically driven processes. These findings demonstrate that CBC is an effective adsorbent for Cd²⁺ and Zn²⁺ removal and provide useful insights for the development of biochar–based materials for treating multi–metal contaminated water.</p> Graphical Abstract <p></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

High-efficiency Removal and Mechanisms of Cadmium and Zinc by Crayfish Shell Biochar in a Competitive System

  • 期刊论文

  • 发表日期：

    2026年7月8日

查看全文
  • Xiran Qi,
  • Yuchen Yue,
  • Binhao Wang,
  • Tingting Zhu,
  • Ting Fan,
  • Xuezhi Wang,
  • Nuo Chen,
  • Xintong Lu,
  • Yuci Gao,
  • Haiyan Chen,
  • Wenling Ye

摘要

Biochar is an efficient and cost–effective material for removing heavy metal pollutants from aqueous systems. In this study, biochar derived from crayfish shells pyrolyzed at 800 °C (CBC) exhibited high adsorption capacities for Cd²⁺ (1,152.5 mg/g) and Zn²⁺ (1,135.0 mg/g), even under competitive binary conditions. BET analysis showed that CBC had a specific surface area of 20.07 m²/g, with mesopores accounting for 98.56% of the total pore volume. SEM–EDS analysis revealed a significant decrease in Ca content after adsorption, indicating the involvement of calcium–based components in the removal process. The adsorption process followed pseudo–second–order kinetics and was well described by the Freundlich isotherm model. In the binary system, differences in adsorption behavior between Cd²⁺ and Zn²⁺ were observed, indicating the coexistence of competitive and interactive effects. Comprehensive characterization results (XRD, FTIR, SEM–EDS) suggested that ion exchange and precipitation were the dominant mechanisms, accompanied by contributions from surface complexation. The formation of CdCO₃ and ZnO phases further supported the role of chemically driven processes. These findings demonstrate that CBC is an effective adsorbent for Cd²⁺ and Zn²⁺ removal and provide useful insights for the development of biochar–based materials for treating multi–metal contaminated water.

Graphical Abstract