Liu Long, Chang Sheng, Wang Yan, Zhao Hexiang, Wang Shuteng, Zheng Chengfeng, Ding Yingying, Ren Shixue, Zhang Jiguo, Guo Yuan-Ru
Key Laboratory of Bio-based Material Science & Technology (Ministry of Education), College of Material Science and Engineering, Northeast Forestry University Harbin 150040 China
Harbin Center for Disease Control and Prevention Harbin 150056 China.
RSC Adv. 2021 Jul 21;11(41):25258-25265. doi: 10.1039/d1ra03647e. eCollection 2021 Jul 19.
An FeO/carboxymethyl cellulose (FeO/CMC) magnetic biosorbent was prepared using the ion-imprinting technology, where La(iii) was used as the template ion. The morphology and structure of FeO/CMC were characterized by SEM, FTIR and XRD. It is found that nano FeO with inverse spinel structure can distribute in CMC and endow the composite with good magnetic properties. The adsorption performance such as adsorption capacity, influence of pH and initial concentration were fully explored. The prepared FeO/CMC is revealed to have good adsorption properties with of 61.5 mg g, in line with the pseudo-second-order kinetic model. When handling the multi-ion coexistence solution of Cu(ii), Ni(ii) and Cd(ii), FeO/CMC shows high selective adsorption for La(iii). Meanwhile, cycling experiments find that the adsorption capacity is only slightly reduced (less than 5%) after 5-time reuse. Good adsorption properties, high selectivity and easy recovery give the newly-synthesized FeO/CMC biosorbent broad application potential in the treatment of La(iii)-containing wastewater.
采用离子印迹技术制备了一种以镧（Ⅲ）为模板离子的FeO/羧甲基纤维素（FeO/CMC）磁性生物吸附剂。通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）对FeO/CMC的形貌和结构进行了表征。结果发现，具有反尖晶石结构的纳米FeO能够分散在CMC中，并赋予该复合材料良好的磁性。对其吸附性能，如吸附容量、pH值和初始浓度的影响等进行了充分研究。所制备的FeO/CMC表现出良好的吸附性能，吸附量为61.5 mg/g，符合准二级动力学模型。在处理Cu（Ⅱ）、Ni（Ⅱ）和Cd（Ⅱ）多离子共存溶液时，FeO/CMC对La（Ⅲ）表现出高选择性吸附。同时，循环实验发现，经过5次重复使用后，吸附容量仅略有降低（小于5%）。良好的吸附性能、高选择性和易于回收使得新合成的FeO/CMC生物吸附剂在含La（Ⅲ）废水处理中具有广阔的应用潜力。
