Facile synthesis of novel 3D flower-like magnetic La@Fe/C composites from ilmenite for efficient phosphate removal from aqueous solution.
Facile synthesis of novel 3D flower-like magnetic La@Fe/C composites from ilmenite for efficient phosphate removal from aqueous solution.
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利用钛铁矿轻松合成新型 3D 花状磁性 La@Fe/C 复合材料，用于有效去除水溶液中的磷酸盐
DOI：
10.1039/c9ra05606h
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发表时间：
2019-09-09
期刊：
影响因子：
3.9
通讯作者：
Xie, Ruzhen
中科院分区：
文献类型：
--
作者：
Wang, Pengchen;Armutlulu, Andac;Jiang, Wenju;Lai, Bo;Xie, Ruzhen
在本研究中，通过微波辐射对钛铁矿进行碳热还原，成功合成了一种新型的三维花状La@Fe/C磁性复合材料。研究了复合材料的理化性能。结果表明，La@Fe/C具有三维花状形态，SBET和Vmic分别为114 m2 g−1和0.017 cm3 g−1。用XRD和XPS检测了吸附剂表面的零价铁和金属氧化物，这是用椰壳基碳对钛铁矿进行碳热还原，然后引入镧而形成的。合成的磁性La@Fe/C在竞争离子超过50倍的情况下也表现出显著的磷酸选择性，优于原始钛铁矿和椰子活性炭。吸附等温线和吸附动力学分别符合Langmuir模型和拟二阶模型。热力学研究表明，磷酸盐的吸附是自发的、吸热的。La@Fe/C复合材料的吸附再生循环实验表明，该复合材料具有良好的可回收性。研究结果表明，钛铁矿碳热还原后引入镧可以获得高效、可回收的磁性颗粒，用于废水中磷酸盐的去除。
In this study, a novel 3D flower-like La@Fe/C magnetic composite was successfully synthesized by carbothermal reduction of ilmenite via microwave radiation. The physico-chemical properties of the composite were investigated. The results showed that La@Fe/C features a 3D flower-like morphology with an SBET and Vmic of 114 m2 g−1 and 0.017 cm3 g−1, respectively. Zerovalent iron and metal oxides were detected by XRD and XPS on the surface of the adsorbent, which formed as a result of carbothermal reduction of ilmenite using coconut shell-based carbon followed by the introduction of lanthanum. This resultant magnetic La@Fe/C exhibited remarkable phosphate selectivity performance even in the presence of a 50-fold excess of competing ions, which is superior to the pristine ilmenite and coconut activated carbon. Adsorption isotherms and adsorption kinetics fitted well with the Langmuir model and pseudo-second-order model, respectively. A thermodynamic study indicated that the adsorption of phosphate was spontaneous and endothermic. The adsorption–regeneration cyclic experiments of the La@Fe/C composite demonstrated a good level of recyclability. These results indicated that carbothermal reduction of ilmenite followed by the introduction of lanthanum could result in highly efficient and recoverable magnetic particles for the removal of phosphate from wastewater.
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