La-Fe改性蛭石对水中磷酸盐的高效去除:吸附行为及内在机制
Performance and mechanism of La-Fe modified vermiculite adsorbent for efficient phosphorus removal
李铃 1莫创荣 1邓冬祝 1廖丹伶 1曹传麒 1许雪棠2
作者信息
- 1. 广西大学 资源环境与材料学院,南宁 530000
- 2. 广西大学 化学化工学院,南宁 530000
- 折叠
摘要
蛭石(VE)作为吸附剂具有很强的吸附性及离子交换能力,价格低廉、丰富易得,对环境无害.近年来,许多关于蛭石吸附的研究获得报道,但由于疏水性弱且缺乏活性位点使其在磷酸盐吸附方面表现不佳.本文制备了 Le-Fe双金属改性蛭石提升对磷酸盐的吸附性能.结果表明:La、Fe原子比为1∶2时改性蛭石(La-Fe/VE-2)具有优异的磷吸附能力,最大吸附容量为185.09 mg P/g,且在pH=3～9的范围内能实现高效吸附.La-Fe/VE-2具有较强的抗阴离子干扰性能,在中低浓度磷酸盐溶液(50～100 mg P/L)条件下仍然保持较高的吸附率(＞90％).材料表征结果显示,La和Fe成功负载在蛭石上,静电吸附和配体交换是主要吸附机制.综上所述,双金属改性蛭石对磷酸盐亲和力强,是一种很有前途的除磷吸附剂.
Abstract
Vermiculite(VE)as an adsorbent had strong adsorption and the capability of ion exchange,which was inexpensive,abundant,available and environmental friendly.In recent years,many studies on vermiculite adsorp-tion have been reported,but the weak hydrophobicity and lack of active sites made it perform poorly in phosphate adsorption.In this paper,Le-Fe bimetallic modified vermiculite(La-Fe/VE)was prepared to enhance the adsorp-tion performance of phosphate.The results shows that vermiculite at the atomic ratio of La and Fe of 1∶2(La-Fe/VE-2)has excellent phosphorus adsorption capacity with a maximum adsorption capacity of 185.09 mg P/g and it can achieve highly efficient adsorption in the pH range of 3 to 9.La-Fe/VE-2 has highly resistant to interference from anions,and maintains high adsorption rate(＞90％)at low and medium concentrations of phosphates(50-100 mg P/L).Characterization analyses of the materials conclusively establishes the successful deposition of La and Fe onto the vermiculite substrate.The primary adsorption mechanisms are identifies as electrostatic attraction and ligand exchange.In summary,bimetallic-modified vermiculite has a pronounced affinity for phosphate and is a promising adsorbent for phosphorus removal.
关键词
蛭石/镧/磷酸盐/吸附/改性材料Key words
vermiculite/lanthanum/phosphate/adsorption/modified materials引用本文复制引用
出版年
2024
NETL
NSTL
万方数据