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<p>The enrichment and recovery of rare earth ions is an effective way to achieve sustainable utilization of wastewater resources. Using a simple ultrasound assisted synthesis method, nano hydroxyapatite (HAP) was introduced into ZIF-67 at room temperature to synthesize HAP/ZIF-67 composite materials with rich functional groups. XRD, FT-IR, SEM, XPS, and BET were used to characterize HAP/ZIF-67 composite materials. The effects of pH, contact time, adsorbent dose, ambient temperature, and initial concentration on the adsorbent were investigated through static adsorption experiments with repeated cycles. The results show that the synergistic effect of the Co–OH, –NH–, –C=N– functional groups in ZIF-67 and the Ca–OH and PO<sub>4</sub><sup>3−</sup> groups in nano-HAP improves the adsorption capacity of the composite material. Under the optimal conditions, HAP/ZIF-67 reached saturation of Ce(III) adsorption within 20&#xa0;min with a maximum adsorption capacity of 461.55&#xa0;mg/g and an adsorption rate of 92.31%. The adsorption characteristic of Ce<sup>3+</sup> on HAP/ZIF-67 composites is more consistent with the Langmuir isotherm model and pseudo-second-order model, which indicate a single-layer, surface-homogeneous chemisorption process for Ce(III) adsorption. The adsorption process is a spontaneous heat absorption process according to thermodynamic research. The main mechanism of HAP/ZIF-67 adsorption of Ce(III) is surface complexation. After four elution experiments, HAP/ZIF-67 adsorbent has good reusability, indicating that HAP/ZIF-67 is a promising adsorbent in the field of rare earth ion recovery.</p>

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Study on the Efficient Adsorption of Ce(III) by Hydroxyapatite Composite Zeolite Imidazolium Framework-67

  • 期刊论文

  • 发表日期：

    2025年6月7日

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  • Dan Xu,
  • Yuanyuan Qin,
  • Yuhua Huang,
  • Jiaming Wang,
  • Xiao Liu,
  • Feiyan Liu,
  • Xiancai Li,
  • Xiaohua Cao

摘要

The enrichment and recovery of rare earth ions is an effective way to achieve sustainable utilization of wastewater resources. Using a simple ultrasound assisted synthesis method, nano hydroxyapatite (HAP) was introduced into ZIF-67 at room temperature to synthesize HAP/ZIF-67 composite materials with rich functional groups. XRD, FT-IR, SEM, XPS, and BET were used to characterize HAP/ZIF-67 composite materials. The effects of pH, contact time, adsorbent dose, ambient temperature, and initial concentration on the adsorbent were investigated through static adsorption experiments with repeated cycles. The results show that the synergistic effect of the Co–OH, –NH–, –C=N– functional groups in ZIF-67 and the Ca–OH and PO43− groups in nano-HAP improves the adsorption capacity of the composite material. Under the optimal conditions, HAP/ZIF-67 reached saturation of Ce(III) adsorption within 20 min with a maximum adsorption capacity of 461.55 mg/g and an adsorption rate of 92.31%. The adsorption characteristic of Ce3+ on HAP/ZIF-67 composites is more consistent with the Langmuir isotherm model and pseudo-second-order model, which indicate a single-layer, surface-homogeneous chemisorption process for Ce(III) adsorption. The adsorption process is a spontaneous heat absorption process according to thermodynamic research. The main mechanism of HAP/ZIF-67 adsorption of Ce(III) is surface complexation. After four elution experiments, HAP/ZIF-67 adsorbent has good reusability, indicating that HAP/ZIF-67 is a promising adsorbent in the field of rare earth ion recovery.