低共熔溶剂中氢氧化镧的形貌控制合成及表征

Morphology-Controlled Synthesis and Characterization of Lanthanum Hydroxide in Deep Eutectic Solvents

低共熔溶剂中使用沉淀法合成了纳米La(OH)3颗粒,并采用X射线衍射(XRD)、孔结构表征(BET)、扫描电镜(SEM)、透射电镜(TEM)等方法对La(OH)3纳米颗粒进行分析和表征。探究了不同的反应条件对La(OH)3形貌的影响,以磷酸二氢钾模拟废水进行了吸附试验。结果表明,以水和尿素-氯化胆碱为溶剂时,合成的La(OH)3形貌为颗粒状,颗粒直径为0.02~3.00μm;以乙二醇-氯化胆碱为溶剂时,合成的La(OH)3形貌为棒状,颗粒长度为80~180 nm。样品对磷酸二氢钾的最大吸附容量为58~86 mg/g,吸附磷酸二氢钾的吸附等温线更接近Langmuir模型。

Nano-La(OH)3 particles were synthesized using a precipitation method in deep eutectic solvents(DES).These materials were analyzed and characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and nitrogen adsorption(BET).The effects of different reaction conditions on the morphology of lanthanum hydroxide were explored.In addition,an adsorption test was performed with KH2PO4 simulated wastewater.The results show that the La(OH)3 particles synthesized with water and urea-choline chloride have a granular morphology,and the diameter is between 0.02μm and 3.00μm.When ethylene glycol-choline chloride is used as solvents,La(OH)3 have a rod morphology with particle length between 80 nm and 180 nm.The maximum adsorption capacity is between 58 mg/g and 86 mg/g and the adsorption isotherm of KH2PO4 is best fitted with Langmuir model.