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Fabrication of a Lignin-Based Magnetic Nanocomposite Adsorbent to Recover Phosphorus in Water for Agricultural Reuse

文献类型： 外文期刊

作者： Li, Tiantian 1 ; Tong, Zhaohui 1 ; Zheng, Qingzhu 3 ; Bao, Hanxi 1 ; Partow, Arianna 1 ; Meng, Shanyu 1 ; Li, Lixia 1 ; L 1 ;

作者机构： 1.Univ Florida, Dept Agr & Biol Engn, Gainesville, FL 32611 USA

2.Univ Florida, Inst Food & Agr Sci, Trop Res & Educ Ctr, Dept Soil & Water Sci, Homestead, FL 33031 USA

3.Qingdao Agr Univ, Coll Resources & Environm, Qingdao Engn Res Ctr Rural Environm, Qingdao 266109, Peoples R China

4.Beijing Acad Agr & Forestry Sci BAAFS, Inst Plant Nutr & Resource, Beijing 100097, Peoples R China

关键词： nanobiosorbent; phosphorus removal; phosphorus recycle; lignin-based; magnetic nanocomposite

期刊名称：ACS SUSTAINABLE CHEMISTRY & ENGINEERING （ 影响因子：8.198； 五年影响因子：8.471 ）

ISSN： 2168-0485

年卷期： 2021 年 9 卷 31 期

页码：

收录情况： SCI

摘要： Phosphorus (P) is an essential nutrient for crops, but its excess in discharge water harms both surface water and groundwater quality. A cost-effective and eco-friendly adsorbent is desirable to meet circular economy criteria by effectively removing P from water and being safely recycled for agricultural use. Thus, this study aims to synthesize an amine-functionalized magnetic lignin nanocomposite biosorbent by first grafting poly(ethyleneimine) on epoxidized lignin followed by coprecipitation with iron. This biosorbent shows an adsorption performance of 43 mg g(-1), which is 20 times greater than the unmodified lignin reported in a previous research study and six times more than the magnetic iron metal. A series of characterization methods confirm the chemical features and the formation of a nanostructure. The pH, coexisting anions, and salt concentrations affect the P removal efficiency. The mechanism studies show that the electrostatic interaction between NH3+ functional groups and P, surface precipitation, and ligand exchange all count for P removal, which indicates the heterogeneous adsorption of P onto the sorbent surface by both chemisorption and physisorption. The seedling study confirms that the nanocomposite after P adsorption has better root development and biomass accumulation as a recycled fertilizer.

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