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Insight into the mechanism of nano-TiO2-doped biochar in mitigating cadmium mobility in soil-pak choi system

文献类型： 外文期刊

作者： Liu, Jing 1 ; He, Tieguang 3 ; Yang, Zhixing 1 ; Peng, Shirui 1 ; Zhu, Yanhuan 5 ; Li, Hong 6 ; Lu, Dan 1 ; Li, Qiaoxian 1 ; Feng, Yaxuan 1 ; Chen, Kuiyuan 1 ; Wei, Yanyan 1 ;

作者机构： 1.Guangxi Univ, Coll Agr, State Key Lab Conservat & Utilizat Subtrop Agribio, Guangxi Key Lab Agroenvironm & Agroprod Safety, Nanning 530005, Peoples R China

2.Chinese Acad Sci, Inst Genet & Dev Biol, State Key Lab Plant Genom, Beijing 100101, Peoples R China

3.Guangxi Acad Agr Sci, Agr Resources & Environm Res Inst, Guangxi Key Lab Arable Land Conservat, Nanning 530007, Peoples R China

4.Chinese Acad Sci, Inst Urban Environm, CAS Key Lab Urban Environm & Hlth, Xiamen 361021, Peoples R China

5.Univ Chinese Acad Sci, Sino Danish Coll, Beijing 100049, Peoples R China

6.Chongqing Univ, Key Lab Ecoenvironm Three Gorges Reg, Minist Educ, Chongqing 400044, Peoples R China

关键词： Nanoparticles; Biochar; Cadmium; Microbial community; Soil metabolism; Soil remediation

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2024 年 916 卷

页码：

收录情况： SCI

摘要： Soil cadmium (Cd) pollution poses severe threats to food security and human health. Previous studies have reported that both nanoparticles (NPs) and biochar have potential for soil Cd remediation. In this study, a composite material (BN) was synthesized using low-dose TiO2 NPs and silkworm excrement-based biochar, and the mechanism of its effect on the Cd-contaminated soil-pak choi system was investigated. The application of 0.5 % BN to the soil effectively reduced 24.8 % of diethylenetriaminepentaacetic acid (DTPA) Cd in the soil and promoted the conversion of Cd from leaching and HOAc-extractive to reducible forms. BN could improve the adsorption capacity of soil for Cd by promoting the formation of humic acid (HA) and increasing the cation exchange capacity (CEC), as well as activating the oxygen-containing functional groups such as C-O and C--O. BN also increased soil urease and catalase activities and improved the synergistic network among soil bacterial communities to promote soil microbial carbon (C) and nitrogen (N) cycling, thus enhancing Cd passivation. Moreover, BN increased soil biological activity -associated metabolites like T-2 Triol and altered lipid metabolism -related fatty acids, especially hexadecanoic acid and dodecanoic acid, crucial for bacterial Cd tolerance. In addition, BN inhibited Cd uptake and root -to -shoot translocation in pak choi, which ultimately decreased Cd accumulation in shoots by 51.0 %. BN significantly increased the phosphorus (P) uptake in shoots by 59.4 % by improving the soil microbial P cycling. This may serve as a beneficial strategy for pak choi to counteract Cd toxicity. These findings provide new insights into nanomaterial-doped biochar for remediation of heavy metal contamination in soil -plant systems.

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