Scholarlink

<p>Cadmium (Cd) contamination in aquatic systems is a widespread environmental issue. In this study, a solid waste iron tailings and biochar hybrid (Fe-TWBC) was successfully synthesized derived from co-pyrolysis of peanut shell and tailing waste (Fe-TW). Characterization analyses showed that the metal oxides from solid waste iron tailings successfully loaded onto the biochar surface, with more functional groups in Fe-TWBC. The Fe-TWBC had a maximum capacity of 95.06&#xa0;mg·g<sup>−1</sup> on Cd<sup>2+</sup> adsorption, which was 1.40 times to pristine BC (70.46&#xa0;mg·g<sup>−1</sup>) and 2.53 times to Fe-TW (37.51&#xa0;mg·g<sup>−1</sup>). The adsorption behavior followed the pseudo-second-order kinetics and Freundlich models. DFT calculations revealed that the O-top of Fe–O group was the most chemically reactive site for Cd<sup>2+</sup> adsorption with the high adsorption energy values of − 4.05&#xa0;eV, short O-Cd bond lengths (2.133&#xa0;Å), low electrostatic potentials in small blue regions near the O atom of Fe–O group, low energy gap (0.22 eV) and large electrophilic Fukui index (f<sup>−</sup> = 0.18). Overall, these findings suggest that Fe-TWBC is effective in removing Cd<sup>2+</sup> from aqueous solution and promotes the utilization of biowaste and solid waste iron tailing waste for cleaner production.</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

Adsorption properties and mechanisms of Cd by co-pyrolysis composite material derived from peanut biochar and tailing waste

  • 期刊论文

  • 发表日期：

    2025年1月3日

查看全文
  • Xiaoqing Zhang,
  • Jiong Li,
  • Xin Li,
  • Zhihua Chen,
  • Dajun Ren,
  • Shuqin Zhang

摘要

Cadmium (Cd) contamination in aquatic systems is a widespread environmental issue. In this study, a solid waste iron tailings and biochar hybrid (Fe-TWBC) was successfully synthesized derived from co-pyrolysis of peanut shell and tailing waste (Fe-TW). Characterization analyses showed that the metal oxides from solid waste iron tailings successfully loaded onto the biochar surface, with more functional groups in Fe-TWBC. The Fe-TWBC had a maximum capacity of 95.06 mg·g−1 on Cd2+ adsorption, which was 1.40 times to pristine BC (70.46 mg·g−1) and 2.53 times to Fe-TW (37.51 mg·g−1). The adsorption behavior followed the pseudo-second-order kinetics and Freundlich models. DFT calculations revealed that the O-top of Fe–O group was the most chemically reactive site for Cd2+ adsorption with the high adsorption energy values of − 4.05 eV, short O-Cd bond lengths (2.133 Å), low electrostatic potentials in small blue regions near the O atom of Fe–O group, low energy gap (0.22 eV) and large electrophilic Fukui index (f− = 0.18). Overall, these findings suggest that Fe-TWBC is effective in removing Cd2+ from aqueous solution and promotes the utilization of biowaste and solid waste iron tailing waste for cleaner production.