A highly porous animal bone-derived char with a superiority of promoting nZVI for Cr(VI) sequestration in agricultural soils

被引：50
作者：
Liu, Kai [1 ,2 ]
Li, Fangbai [1 ,2 ]
Tian, Qingwen [1 ,2 ,3 ]
Nie, Chengrong [3 ]
Ma, Yibing [4 ]
Zhu, Zhenlong [1 ,2 ]
Fang, Liping [1 ,2 ]
Huang, Yuanying [5 ,6 ]
Liu, Siwen [5 ,6 ]
机构：
[1] Guangdong Acad Sci, Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Integrated Agroenvironm Pollut, Guangzhou 510650, Peoples R China
[2] Natl Reg Joint Engn Res Ctr Soil Pollut Control &, Guangzhou 510650, Peoples R China
[3] Foshan Univ, Sch Food Sci & Engn, Foshan 528225, Peoples R China
[4] Macau Univ Sci & Technol, Macao Environm Res Inst, Macau, Peoples R China
[5] Natl Res Ctr Geoanal, Beijing 100037, Peoples R China
[6] Key Lab Minist Nat Resources Ecogeochem, Beijing 100037, Peoples R China
来源：
JOURNAL OF ENVIRONMENTAL SCIENCES | 2021年 / 104卷
基金：
中国国家自然科学基金;
关键词：
Bone char; Nano zero-valent iron; Adsorption; Chromium; Reduction; ZERO-VALENT IRON; AQUEOUS-SOLUTION; HEXAVALENT CHROMIUM; EFFICIENT REMOVAL; WASTE-WATER; ENVIRONMENTAL REMEDIATION; BIOCHAR; METAL; ADSORPTION; PERFORMANCE;
D O I：
10.1016/j.jes.2020.11.031
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Paddy soil and irrigation water are commonly contaminated with hexavalent chromium [Cr(VI)] near urban industrial areas, thereby threatening the safety of agricultural products and human health. In this study, we develop a porous and high specific area bone char (BC) to support nanoscale zero-valent iron (nZVI) and apply it to remediate Cr(VI) pollution in water and paddy soil under anaerobic conditions. The batch experiments reveal that BC/nZVI exhibits a higher removal capacity of 516.7 mg/(g.nZVI) for Cr(VI) than nZVI when normalized to the actual nZVI content, which is 2.8 times that of nZVI; moreover, the highest nZVI utilization is the nZVI loading of 15% (BC/nZVI15). The Cr(VI) removal efficiency of BC/nZVI15 decreases with increasing pH (4 - 10). Coexisting ions (phosphate and carbonate) and humic acid can inhibit the removal of Cr(VI) with BC/nZVI15. Additionally, BC exhibits a strong ad-vantage in promoting Cr(VI) removal by nZVI compared to the widely used biochar and activated carbon. Our results demonstrate that reduction and coprecipitation are the dominant Cr(VI) removal mechanisms. Furthermore, BC/nZVI15 shows a significantly higher reduction and removal efficiency as well as a strong anti-interference ability for Cr(VI) in paddy soil, as compared to nZVI. These findings provide a new effective material for remediating Cr(VI) pollution from water and soil. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
引用
收藏
页码：27 / 39
页数：13
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