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One-step synthesis of phytic acid-assisted hydrochar boost selective sorption and in situ passivation of lanthanum

文献类型： 外文期刊

作者： Pei, Xiaodong 1 ; Gao, Hailong 2 ; Shang, Cenyao 1 ; Huang, Junxia 1 ; Ge, Mengting 1 ; Xie, Huifang 1 ; Feng, Yanfang 3 ; Wang, Bingyu 1 ;

作者机构： 1.Nanjing Univ Sci & Technol, Sch Environm & Biol Engn, Jiangsu Key Lab Chem Pollut Control & Resources Re, Nanjing 210094, Peoples R China

2.Jiangsu Prov Assessment Ctr Ecol & Environm, Nanjing 210036, Peoples R China

3.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agroenvironm Downstream Yangtze Plain, Natl Agr Expt Stn Agr Environm,Minist Agr & Rural, Nanjing 210014, Peoples R China

关键词： Hydrochar; Phytic acid assistance; Lanthanum; Sorption selectivity; Soil passivation

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 2022影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2024 年 917 卷

页码：

收录情况： SCI

摘要： The rare earth metal element lanthanum (La) possesses carcinogenic, genotoxic, and accumulative properties, necessitating urgent development of an efficient and cost-effective method to remove La. However, current sorbents still encounter challenges such as poor selectivity, low sorption capacity, and high production costs. This study therefore proposes a promising solution: the creation of phytic acid-assisted sludge hydrochars (P-SHCs) to eliminate La from water and soil environments. This method harnesses phytic acid's exceptional binding ability and the economical hydrothermal carbonization process. P-SHCs exhibit robust sorption affinity, fast sorption kinetics, and excellent sorption selectivity for La when compared with pristine hydrochars (SHCs). This advantage arises from the remarkable binding ability of phosphate functional groups (polyphosphates) on PSHCs, forming P-O-La complexes. Moreover, P-SHCs demonstrate sustained sorption efficiency across at least five cycles, with a slight decrease attributed to the loss of phosphorus species and mass during recycling. Furthermore, P-SHCs demonstrated superior economic feasibility, with a higher estimated cost-benefit ratio than that of other sorbents. Our study further validates the exceptional passivation capability of P-SHCs, showcasing relative stabilization efficiency ranging from 37.6 % to 79.6 % for La contamination. Additionally, acting as soil passivation agents, P-SHCs foster the enrichment of specific soil microorganisms such as Actinobacteria and Proteobacteria, capable of solubilizing phosphorus and resisting heavy metals. These findings present novel ideas and technical support for employing P-SHCs in combatting environmental pollution stemming from rare earth metals.

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