Regenerable magnetic aminated lignin/Fe3O4/La(OH)3 adsorbents for the effective removal of phosphate and glyphosate

Changsong Li; Yijing Li; Qiang Li; Junling Duan; Juying Hou; Qin Hou; Shiyun Ai; Houshen Li; Yuechao Yang

doi:10.1016/j.scitotenv.2021.147812

Regenerable magnetic aminated lignin/Fe₃O₄/La(OH)₃ adsorbents for the effective removal of phosphate and glyphosate

Sci Total Environ. 2021 Sep 20:788:147812. doi: 10.1016/j.scitotenv.2021.147812. Epub 2021 May 17.

Authors

Changsong Li¹, Yijing Li², Qiang Li¹, Junling Duan¹, Juying Hou¹, Qin Hou¹, Shiyun Ai¹, Houshen Li³, Yuechao Yang⁴

Affiliations

¹ College of Chemistry and Material Science, Shandong Agricultural University, Taian, Shandong, 271018, PR China.
² College of Chemistry and Material Science, Shandong Agricultural University, Taian, Shandong, 271018, PR China; College of Resources and Environment, Shandong Agricultural University, Taian, Shandong 271018, PR China. Electronic address: yjli@sdau.edu.cn.
³ College of Chemistry and Material Science, Shandong Agricultural University, Taian, Shandong, 271018, PR China. Electronic address: hsli@sdau.edu.cn.
⁴ College of Resources and Environment, Shandong Agricultural University, Taian, Shandong 271018, PR China; National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, National Engineering & Technology Research Center for Slow and Controlled Release Fertilizers, Taian, Shandong 271018, PR China. Electronic address: yangyuechao2010@163.com.

PMID: 34023609
DOI: 10.1016/j.scitotenv.2021.147812

Abstract

Phosphates and organophosphorus cause environmental pollution, and excessive phosphate leads to water eutrophication. Glyphosate, an organophosphorus herbicide, harms the environment and human health. In this study, regenerable magnetic AL/Fe₃O₄/La(OH)₃ adsorbents were developed by modifying Fe₃O₄ and La(OH)₃ on aminated lignin (AL) for phosphate and glyphosate removal. The adsorption capacity for phosphate and glyphosate reached 60.36 mg g^-1 and 83.87 mg g^-1 when the initial concentrations were 150 mg L^-1 and 250 mg L^-1, respectively. The thermodynamic data showed that adsorption is a spontaneous and endothermic process. Adsorption can be applied at pH values ranging from 3 to 11 and is more suitable under acidic conditions. Fe₃O₄ and La(OH)₃ both enhanced the adsorption capacities of phosphate and glyphosate. Phosphate and glyphosate compete slightly when coexisting in the adsorption process at low concentrations. Due to the magnetic properties of Fe₃O₄, the adsorbents can be separated rapidly and effectively with an external magnetic field. 89% adsorption capacity remained after four adsorption-desorption recycles. Thus, AL/Fe₃O₄/La(OH)₃ shows potential for phosphate and glyphosate removal as an effective and reusable adsorbent.

Keywords: Adsorption; Glyphosate; Lanthanum; Magnetic; Phosphorus.