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Nitric acid-modified hydrochar enhance Cd2+ sorption capacity and reduce the Cd2+ accumulation in rice

文献类型： 外文期刊

作者： Zheng, Xuebo 1 ; Ma, Xiaogang 1 ; Hua, Yun 2 ; Li, Detian 4 ; Xiang, Jian 5 ; Song, Wenjing 1 ; Dong, Jianxin 1 ;

作者机构： 1.Chinese Acad Agr Sci, Key Lab Tobacco Biol & Proc, Minist Agr & Rural Affairs, Tobacco Res Inst, Qingdao 266101, Peoples R China

2.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China

3.Chinese Acad Agr Sci, Grad Sch, Beijing 100081, Peoples R China

4.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Key Lab Agroenvironm Downstream Yangtze Plain, Minist Agr & Rural Affairs, Nanjing 210014, Peoples R China

5.Nanjing Forestry Univ, Coll Forest, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China

关键词： Hydrochar; Nitric acid modification; Cd2+ adsorption; Cd-contaminated soil improvement; Rice

期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）

ISSN： 0045-6535

年卷期： 2021 年 284 卷

页码：

收录情况： SCI

摘要： Remediating the agricultural soil polluted by cadmium (Cd) is a serious issue in China. Hydrochar showed its potential to purify Cd-contaminated water and improve Cd-contaminated soil due to its vast amounts of macro- and microporous structures. In this study, three concentration gradients of nitric acid (HNO3, mass fraction: 5%, 10%, 15%) were implemented to age pristine wheat straw hydrochar (N0-HC) aiming to improve surface physiochemical properties. Four HNO3-aging hydrochars named N0-HC, N5-HC, N10-HC, N15-HC were used to both remove Cd2+ from aqueous solution and improve soil properties. Results showed that HNO3-aging significantly improved the Cd2+ adsorption capacity by 1.9-9.9 folds compared to crude hydrochar due to the increased specific surface area (by 1.5-6.5 folds) and oxygen-containing functional group abundance (by 4.5-22.1%). Besides, initial solution pH of 8 or environmental temperature of 318.15 K performed the best Cd2+ adsorption capacity. Furthermore, the process of Cd2+ adsorption was fitted best to pseudo-second-order (R-2 = 0.95) and Langmuir models (R-2 = 0.98), respectively. Nanjing 46 (Oryza sativa L) and HNO3-aging hydrochars were furtherly applied into Cd-contaminated paddy soil to investigate the mitigation of Cd translation from soil to rice. N15-HC-1% (w/w) performed the best effect on reducing cadmium accumulation in various parts of rice plants. Overall, this research provided an approach to improve hydrochar capacity to remove Cd2+ from aqueous solution and mitigate Cd translation from soil to rice.

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