Simultaneous immobilization of Pb, Cd and As in soil by hybrid iron-, sulfate- and phosphate-based bio-nanocomposite: Effectiveness, long-term stability and bioavailablity/bioaccessibility evaluation

被引：22

作者：

Liao, Qi ^{[1
,2
]}

He, Lixu ^{[1
]}

Tu, Guangyuan ^{[1
]}

Yang, Zhihui ^{[1
,2
]}

Yang, Weichun ^{[1
,2
,3
]}

Tang, Jiaqi ^{[1
]}

Cao, Wei ^{[1
]}

Wang, Haiying ^{[1
,2
,3
]}

机构：

[1] Cent South Univ, Sch Met & Environm, Inst Environm Sci & Engn, Changsha 410083, Peoples R China

[2] Natl Engn Res Ctr Heavy Met Pollut Control & Trea, Changsha 410083, Peoples R China

[3] Water Pollut Control Technol Key Lab Hunan Prov, Changsha 410083, Peoples R China

来源：

CHEMOSPHERE | 2021年 / 266卷

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Simultaneous immobilization; Hybrid bio-nanocomposite; Multiple heavy metals and metalloids; Long-term stability; Bioavailablity/bioaccessibility; CONTAMINATED SOILS; HEAVY-METALS; RELATIVE BIOAVAILABILITY; PREDICTIVE CAPABILITIES; LEACHING BEHAVIOR; FUNGAL HYPHAE; PLANT-GROWTH; ACID-RAIN; LEAD; REMEDIATION;

D O I：

10.1016/j.chemosphere.2020.128960

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Here, the bio-nanocomposite (n-HFP + n-HFS)@An was developed to simultaneously immobilize Pb, Cd and As in the severely contaminated soil. The immobilization rates of diethylenetriaminepentaacetic acid (DTPA)/decarbonate-extracted bioavailable Pb, Cd and As were 59.87%, 31.28% and 62.30%, and the immobilization rates of their water-soluble forms were 63.12%, 60.02% and 89.39%, respectively. Moreover, the ten-year acid rain simulated leaching assay showed that the maximum cumulative release contents of Pb, Cd and As in the treated soil samples were decreased by 2.94, 2.46 and 40.60 times, comparing to the un-treated ones. Additionally, the results of SBRC (Solubility Bioaccessibility Research Consortium) revealed that the bioaccessible rates of the three metals in intestinal phase were lower than in gastric phase, and both of them decreased with increasing the immobilization time. The gastric bioaccessibility of Pb, Cd and As had a higher correlation with the contents of water-soluble forms, while the intestinal bioaccessibility was more strongly positively associated with the bioavailable forms. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：11