Effective co-immobilization of arsenic and cadmium in contaminated soil by sepiolite-modified nano-zero-valent iron and its impact on the soil bacterial community
文献类型： 外文期刊
作者： Ainiwaer, Meihaguli 1 ; Jia, Hongtao 1 ; Zhang, Tuo 4 ; Huang, Jiaqing 5 ; Zhang, Nan 2 ; Yin, Xianqiang 3 ; Peng, Limei 6 ; Li, Hongbin 6 ; Zeng, Xibai 2 ;
作者机构： 1.Xinjiang Agr Univ, Coll Resources & Environm, Xinjiang Key Lab Soil & Plant Ecol Proc Urumqi, Urumqi 830052, Peoples R China
2.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China
3.Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Peoples R China
4.Nanning Normal Univ, Sch Environm & Life Sci, Nanning 530100, Peoples R China
5.Fujian Acad Agr Sci, Inst Resources Environm & Soil Fertilizer, Fuzhou 350013, Peoples R China
6.Hunan GRG Metrol & Test Ltd Co, Changsha 410017, Peoples R China
关键词： Arsenic; Cadmium; Sepiolite-modified nano-zero-valent iron; Water management; Soil bacterial community
期刊名称：SCIENTIFIC REPORTS （ 影响因子：3.9； 五年影响因子：4.3 ）
ISSN： 2045-2322
年卷期： 2024 年 14 卷 1 期
页码：
收录情况： SCI
摘要： Sepiolite-modified nano-zero-valent iron (S-nZVI) is used as an amendment and incubated to remediate As-Cd-contaminated soil under three different soil-water management conditions [moderately wet (MW), continuously flooded (CF) and alternately wet and dry (AWD)]. The results showed that soil pH is in the order of CF > AWD > MW. The soil pH increased approximately 0.5 to 1 unit by 3% and 5% doses after 36 d of incubation. Soil pH was negatively correlated with available As-Cd content under the three water regimes (p < 0.01). All doses of S-nZVI significantly reduced soil available As-Cd under the three soil moistures by 45-80% for As and 5-45% for Cd. Moreover, S-nZVI addition also promoted the transformation of As-Cd in the acid-extracted fraction, oxidation fraction, and reduced fraction to a more stable residue fraction. High-throughput sequencing results showed that high doses of S-nZVI had a significant adverse effect on soil bacterial diversity and richness. After 36 d of incubation, the Chao1 index and the Shannon index were significantly decreased in MW, CF, and AWD, respectively. Decreasing the S-nZVI dose and increasing the incubation time simultaneously reduced As-Cd availability and S-nZVI ecotoxicity in the soil, thereby effectively maintaining the survivability of the original dominant bacteria, increasing the soil pH, and promoting the interaction between dominant bacteria and soil factors in As-Cd cocontaminated soil.
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