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Nano-FeS incorporated into stable lignin hydrogel: A novel strategy for cadmium removal from soil

文献类型： 外文期刊

作者： Liu, Yonglin 1 ; Huang, Yongdong 2 ; Zhang, Cong 3 ; Li, Wenyan 1 ; Chen, Chengyu 1 ; Zhang, Zhen 1 ; Chen, Huayi 1 ; Wan 1 ;

作者机构： 1.South China Agr Univ, Coll Nat Resources & Environm, Joint Inst Environm Res & Educ, Guangzhou 510642, Peoples R China

2.Guangdong Acad Agr Sci, Publ Monitoring Ctr Agroprod, Guangzhou 510640, Peoples R China

3.Nanjing Tech Univ, Inst Adv Mat, Nanjing 211816, Peoples R China

4.Minist Agr & Rural Affairs, Key Lab Southern Farmland Pollut Prevent & Contro, Hunan Div GRG Metrol & Test, Changsha 410000, Hunan, Peoples R China

关键词： Lignin hydrogel; Nanoparticle; Heavy metal; Cd removal from soil; Arable soil remediation

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2020 年 264 卷

页码：

收录情况： SCI

摘要： Strategies for reducing cadmium (Cd) content in polluted farmland soils are currently limited. A type of composite with nanoparticles incorporated into a hydrogel have been developed to efficiently remove heavy metals from sewage, but their application in soils faces challenges, such as organic hydrogel degradation due to oxygen exposure and slow Cd2+ release from soil constituents. To overcome these challenges, a composite with superior stability for long-term application in soil is required. In this study, ferrous sulfide (FeS) nanoparticle@lignin hydrogel composites were developed. The lignin-based hydrogels inherited lignin's natural mechanical and environmental stability and the FeS nanoparticles efficiently adsorbed Cd(2+ )and enhanced Cd2+ desorption from soils by producing H+. The high sorption capacity (833.3 g kg(-1)) of the composite was attributed to four proposed mechanisms, including cadmium sulfide (CdS) precipitation via chemical reaction (84.06%), lignin complexation (13.19%), hydrogel swelling (0.61%), and nanoparticle sorption (2.15%). In addition, Fe2+ displaced from the composite was gradually oxidized to form solid iron oxide hydroxide, which increased Cd2+ sorption. The composite significantly reduced the total, surfactant-soluble, and fixed Cd in heavily and lightly polluted paddy soils by 22.4-49.6%, 13.5-68.6%, and 40.1-16.6%, respectively, in 7 days. (C) 2020 Elsevier Ltd. All rights reserved.

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