化工新型材料

化工新型材料 ›› 2022, Vol. 50 ›› Issue (2) : 206-210. DOI: 10.19817/j.cnki.issn1006-3536.2022.02.041

科学研究

MgO/La₂O₃CO₃复合材料对磷酸盐的吸附特征

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Phosphorus adsorption characteristics of MgO/La₂O₃CO₃ composite

Zhao Changxin¹, Nie Fangui¹, Cheng Fulong^1,2, Wu Xiaoqun¹, Liu Fang¹, Pan Jie^1,2

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Received
2020-10-17
Issue Date	Revised Date
2022-03-21	2020-10-17

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摘要

采用水热法制备了MgO/La₂O₂CO₃复合材料(ML)。采用X射线衍射仪和扫描电子显微镜对其结构及表面形貌进行了表征,利用Zeta电位仪测定了其零点电位点,并探究了接触时间、初始磷酸盐浓度和初始pH对磷酸盐吸附效果的影响。结果表明,ML呈现板块状堆叠而成的层状结构,零点电位点为4.52。准二级动力学模型和Freundlich模型更适合描述ML对磷酸盐的吸附过程。由Langmuir模型拟合得到最大吸附量可达110.24mg/g。其对磷酸盐的吸附量随pH的升高逐渐下降。

Abstract

The MgO/La₂O₂CO₃ composite material (ML) was prepared by hydrothermal method.X-ray diffraction and scanning electron microscopy were used to characterize its structure and surface morphology.The zeta potentiometer was used to determine its zero potential point,and the effect of contact time,initial phosphate concentration and initial pH were investigated for phosphate adsorption.The results showed that ML presented a layered structure of stacked plates.The zero potential point of MLwas 4.52.The quasi-second-order kinetic model and Freundlich model were more suitable to describe the adsorption process of ML to phosphate.The maximum adsorption capacity obtained by Langmuir model fitting reached 110.24mg/g.The adsorption capacity of ML to phosphate gradually decreased with the increase of pH.

关键词

氧化镁 / 碳酸氧化镧 / 复合材料 / 吸附 / 磷酸盐

Key words

MgO / La₂O₂CO₃ / composite material / adsorption / phosphate

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MgO/La₂O₃CO₃复合材料对磷酸盐的吸附特征[J]. 化工新型材料, 2022, 50(2): 206-210 DOI:10.19817/j.cnki.issn1006-3536.2022.02.041

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