Magnetic NaA zeolites synthesized from dual solid wastes enables selective efficient recovery of Rare Earth ions from neodymium iron boron electroplating wastewater

使用 Cu 靶材，扫描速度为 8 °/min，角度范围为 5-60°，通过 X 射线衍射（XRD，Miniflex600X，日本）分析样品的物相组成。通过扫描电子显微镜（SEM，Zeiss Sigma500，德国）观察样品的微观结构，观察前喷金。通过傅里叶变换红外光谱 （FT-IR， Shimadzu-IRTracer100， Japan） 分析样品的化学键振动，波数范围为 400~4000 cm-1，分辨率为 2 cm−1。在室温下，用振动样品磁力计（VSM，Lake Shore 8600 VSM，美国）测量样品的磁滞回线，磁场范围为 2 T.比表面积和孔结构分析：样品的 N2 吸附-脱附曲线通过物理吸附仪（Micromeritics-ASAP2460，美国）测试。样品前处理工艺为：在 250 °C 下真空脱气 8 h，测试温度为 77 K。最终样品的比表面积 （SBET） 通过 Brunauer-Emmett-Teller （BET） 方法计算。

The phase composition of the samples was analyzed via X-ray diffraction (XRD, Miniflex600X, Japan) using a Cu target, with a scanning speed of 8 °/min and a 2θ angle range of 5–60°. The microstructure of the samples was observed using a scanning electron microscope (SEM, Zeiss Sigma500, Germany), with gold sputtering performed prior to observation. The chemical bond vibrations of the samples were analyzed via Fourier-transform infrared spectroscopy (FT-IR, Shimadzu-IRTracer100, Japan), with a wavenumber range of 400–4000 cm⁻¹ and a resolution of 2 cm⁻¹. The hysteresis loops of the samples were measured at room temperature using a vibrating sample magnetometer (VSM, Lake Shore 8600 VSM, USA) with a magnetic field range of 2 T. Specific surface area and pore structure analysis: The N₂ adsorption-desorption isotherms of the samples were tested using a physical adsorption analyzer (Micromeritics-ASAP2460, USA). The sample pretreatment process was as follows: vacuum degassing was conducted at 250 °C for 8 h, and the test temperature was set at 77 K. The specific surface area of the final samples (SBET) was calculated via the Brunauer-Emmett-Teller (BET) method.