A novel technique for Cd removal from soil based on alginate-derived floatable spheres

被引：26

作者：

Hu, Tian ^{[1
]}

Chen, Wen-Zhao ^{[1
]}

Bu, Huaitian ^{[2
]}

Li, Wei-Xiong ^{[1
]}

Li, Zeng-Lin ^{[1
]}

Liu, Bu-Ning ^{[1
]}

Lan, Ling-Min ^{[1
]}

Guo, Chuigen ^{[1
]}

Wang, Qingwen ^{[1
]}

Jiang, Gang-Biao ^{[1
]}

机构：

[1] South China Agr Univ, Coll Mat & Energy, Key Lab Biobased Mat & Energy, Minist Educ, Guangzhou 510642, Peoples R China

[2] SINTEF Ind, Dept Mat & Nanotechnol, Forskningsveien 1, N-0373 Oslo, Norway

来源：

CHEMICAL ENGINEERING JOURNAL | 2021年 / 414卷

基金：

中国国家自然科学基金;

关键词：

Activation-removal soil Cd; Recyclable and recoverable; Soil remediation system; Ecological friendliness; Alginate-derived; CONTAMINATED SOIL; BIOCHAR AMENDMENT; HEAVY-METALS; IN-SITU; CADMIUM; REMEDIATION; CARBON; PHYTOREMEDIATION; PERFORMANCE; ADSORPTION;

D O I：

10.1016/j.cej.2021.128777

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This paper proposes a fast, facile and eco-friendly strategy for removing Cd from soil. By combining two types of floatable alginate-derived multifunctional spheres: magnetic hollow carbon composite (MHCC) and calcium alginate aerogel (CAA) spheres, the fixed state Cd in soil is activated and removed sequentially. MHCC spheres activate and desorb the solid phase anchored Cd into mobile Cd2+ ions, and CAA spheres effectively absorb the free Cd2+ ions from the liquid phase via the massive absorption sites of carboxy and hydroxy groups. The remediation results of 5-round successive MHCC-CAA treatments (1.5 g MHCC-0.45 g CAA in 60 g soil) show that 44.02% of Cd is removed from the soil. MHCC spheres demonstrate excellent recyclability of 88.87 and 94.45% in flooding and non-flooding soil, respectively. The texture, cation exchange capacity (CEC) and pH value of the remediated soil suggest that the MHCC-CAA system has little interference on the soil properties. No remarkable hindrance of microbial growth by MHCC or CAA spheres is observed in the eco-toxicological test, indicating the ecological friendliness of MHCC-CAA remediation system.

引用

页数：13

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[31] Certification of trace metal extractable contents in a sediment reference material (CRM 601) following a three-step sequential extraction procedure [J].