Fabrication of La-MHTC Composites for Phosphate Removal: Adsorption Behavior and Mechanism

被引：1
|
作者：
Song X.-B. [1 ,2 ]
He S.-Y. [2 ]
Feng Y.-F. [2 ]
Hua Y. [2 ]
Tang W.-Y. [1 ]
Zhu Q.-R. [1 ,2 ]
Xue L.-H. [2 ]
Yang L.-Z. [2 ]
机构：
[1] School of Chemical Engineering, Nanjing Univesity of Science and Technology, Nanjing
[2] Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing
来源：
Huanjing Kexue/Environmental Science | 2020年 / 41卷 / 02期
关键词：
Biochar; Hydrothermal; La-loaded; Magnetism; Nano-materials;
D O I：
10.13227/j.hjkx.201906088
中图分类号：
学科分类号：
摘要：
Lanthanum (La)-based materials have shown great potential for phosphate removal owing to the strong affinity between La and phosphate. In this study, magnetic hydrothermal biochar immobilized La(OH)3 (La-MHTC) were prepared and used as phosphate adsorbents. Hydrochar was produced by the hydrothermal carbonization process (220℃, 2 h). Magnetic La-MHTC with different La-to-Fe mass ratios were synthesized by the co-precipitation method. Subsequently, La-MHTC was applied to remove phosphate from wastewater. Results indicate that La-MHTC (with a La-to-Fe mass ratio of 2: 1) exhibited excellent magnetic properties for easy recovery and high phosphate adsorption capacity up to 100.25 mg•g-1. Effective phosphate removal was obtained over a wide pH range of 3-10.The absorption isotherm and kinetics were better fitted by the Langmuir model and the pseudo second-order model, respectively, which showed a fast adsorption rate and exhibited superior La utilization efficiency. The La-MHTC has strong selectivity for phosphate in the presence of coexisting ions (Cl-, NO3 -, and SO4 2-). The adsorption-desorption experiment suggested its excellent stability and cyclic utilization. In addition, La-MHTC was applied to treat real domestic wastewater, efficiently reducing the phosphate concentration (from 0.87 mg•L-1 to 0.05 mg•L-1). Electrostatic attraction and inner-sphere complexation between La(OH)3 and P via ligand exchange were the main mechanisms of phosphate adsorption by La-MHTC. © 2020, Science Press. All right reserved.
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页码：773 / 783
页数：10
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