Chen Si, Xu Yongchun, Tang Yu, Chen Wei, Chen Shubin, Hu Lili, Boulon Georges
Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences Shanghai 201800 China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences Beijing 100049 China.
RSC Adv. 2020 Dec 16;10(72):44361-44372. doi: 10.1039/d0ra07761e. eCollection 2020 Dec 9.
The magnetic nano-adsorbent FeO@Mg/Al-CO-LDH (Mg/Al-type layered double hydroxide) with a CO interlayer anion has been synthesized successfully on FeO nanoparticles a urea hydrothermal method. It is confirmed that the nano-adsorbent can adsorb PO rapidly and efficiently in multi-ion solutions; meanwhile, it did not adsorb any F and Cl, even with a high amount of the nano-adsorbent or a longer adsorption time. This behaviour is beneficial for applications to remove PO in phosphorus-rich solutions, and especially can be utilized to determine trace F and Cl anions in phosphorus-rich solutions by physical and chemical analysis methods including ion chromatography without serious interference from PO for trace determinations. Herein, the hydrothermally synthesized FeO@Mg/Al-CO-LDH was characterized SEM, TEM, SAED, XRD, FTIR, magnetic hysteresis loop analysis and adsorption-desorption isotherm analysis. The structure and stability, adsorption mechanism, magnetic saturation value, specific surface area, total pore volume, phosphate adsorption capacity and recyclability are discussed. Using the optimized pretreatment conditions, FeO@Mg/Al-CO-LDH was utilized successfully to adsorb PO in real samples and determine trace F and Cl accurately by ion chromatography; this would be very beneficial for continuous analysis and on-line tests by physical and chemical analysis methods without interference from PO in phosphorus-rich samples, leaving F and Cl even if in a trace content.
采用尿素水热法在FeO纳米颗粒上成功合成了具有CO层间阴离子的磁性纳米吸附剂FeO@Mg/Al-CO-LDH（Mg/Al型层状双氢氧化物）。证实该纳米吸附剂能在多离子溶液中快速高效地吸附PO；同时，即使使用大量的纳米吸附剂或延长吸附时间，它也不吸附任何F和Cl。这种行为有利于在富磷溶液中去除PO的应用，尤其可用于通过包括离子色谱在内的物理和化学分析方法测定富磷溶液中的痕量F和Cl阴离子，而不会受到PO对痕量测定的严重干扰。在此，对水热合成的FeO@Mg/Al-CO-LDH进行了扫描电子显微镜（SEM）、透射电子显微镜（TEM）、选区电子衍射（SAED）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、磁滞回线分析和吸附-脱附等温线分析。讨论了其结构与稳定性、吸附机理、磁饱和值、比表面积、总孔体积、磷酸盐吸附容量和可回收性。利用优化的预处理条件，FeO@Mg/Al-CO-LDH成功用于实际样品中PO的吸附，并通过离子色谱准确测定痕量F和Cl；这对于通过物理和化学分析方法进行连续分析和在线测试非常有益，不会受到富磷样品中PO的干扰，即使F和Cl含量痕量也能检测到。
