Effects of iron-modified biochar with S-rich and Si-rich feedstocks on Cd immobilization in the soil-rice system

Sui, Fengfeng; Kang, Yaxin; Hao, Wu; Li, Hao; Wang, J.; Joseph, Stephen; Munroe, Paul; Li, Lianqing; Pan, Genxing

doi:10.1016/j.ecoenv.2021.112764

Cited by 20 publications

(3 citation statements)

References 56 publications

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“…This study provided the vital evidence that the Cd(II) sorption was largely strengthened through adding the DOM derived from the co-decomposition of MV and RS, which might offer potential for the remediation of Cd-contaminated soil by combined green manure, rice straw, and passivated material in paddy fields. Furthermore, the superior Cd(II) adsorption performance of FB has achieved high adsorption efficiency at lower dosages compared to previous studies, reducing the potential negative effects associated with large-dosage application of biochar (Sui et al 2021;Sun et al 2022). From another perspective, the improvement of different physicochemical properties of soil by co-using milk vetch, rice straw, and iron-modified also reflected its adaptability and superiority on soil fertilization.…”

Section: Environmental Implicationsmentioning

confidence: 86%

“…Similarly, RS application could promote the greater microbial iron reduction (Yuan et al 2019). In addition, FB could provide the Fe source for the IP formation and further controlled the Cd adsorption by rice (Sui et al 2021). Consequently, co-incorporation of MR and FB exhibited the stronger capacity on decreasing Cd bioavailability.…”

Section: Overall Findings and Proposed Mechanismmentioning

confidence: 99%

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The dissolved organic matter from the co-decomposition of Chinese milk vetch and rice straw induces the strengthening of Cd remediation by Fe-modified biochar

Liang,

Zhou,

Chang

et al. 2024

Biochar

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Fe-modified biochar (FB) and co-using Chinese milk vetch and rice straw (MR) are two effective ways for mitigating the cadmium (Cd) contamination in paddy fields in southern China. Nevertheless, the effects of FB combined with MR on Cd passivation mechanism remain unclear. In the current study, the strengthening effects of FB induced by MR were found and the mechanisms of the extracted dissolved organic matter (DOM) from the co-decomposition of MR on Cd alleviation were investigated through pot experiment and adsorption experiment. Pot experiment demonstrated that co-incorporating FB and MR decreased available Cd by 23.1% and increased iron plaque concentration by 11.8%, resulting in a 34.7% reduction in Cd concentrations in brown rice compared with addition of FB. Furthermore, co-using FB and MR improved available nutrients in the soil. The molecular characteristics of DOM derived from the decomposition of MR (DOM-MR) were analyzed by fluorescence excitation emission matrix spectroscopy-parallel factor analysis (EEM-PARAFAC) and Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS). Results showed that lignin/carboxylic-rich alicyclic molecules and protein/amino sugar were the main compounds, potentially involved in the Cd binding. Adsorption experiments revealed that the addition of DOM-MR improved the functional groups, specific surface area, and negative charges of FB, inducing the strengthening of both physisorption and chemisorption of Cd(II). The maximum adsorption capacity of Fe-modified biochar after adding DOM-MR was 634 mg g−1, 1.30 times that without the addition of DOM-MR. This study suggested that co-incorporating MR, and FB could serve as an innovative practice for simultaneous Cd remediation and soil fertilization in Cd-polluted paddy fields. It also provided valuable insights and basis that DOM-MR could optimize the performances of Fe-modified biochar and enhance its potential for Cd immobilization. Graphical Abstract

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Section: Environmental Implicationsmentioning

confidence: 86%

Section: Overall Findings and Proposed Mechanismmentioning

confidence: 99%

The dissolved organic matter from the co-decomposition of Chinese milk vetch and rice straw induces the strengthening of Cd remediation by Fe-modified biochar

Liang,

Zhou,

Chang

et al. 2024

Biochar

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“…This study revealed that the decrease in brown rice content was attributable primarily to the fact that FMBC could reduce the content of available soil Hg and Cd which could be directly absorbed by the rice, and boost the adsorption performance of soil, thereby limiting the transfer of Hg and Cd from soil to rice plants. Furthermore, the addition of FMBC stimulated the generation of more IMP on the rice root surface, which helped to block HMs and reduce Hg and Cd uptake by rice plants (Sui et al 2021). In conclusion, the incorporation of FMBC into Hg and Cd co-contaminated soils proved to be an effective strategy for inhibiting plantavailable Hg and Cd uptake and transport to brown rice.…”

Section: Hm Accumulation and Translation In Oryza Sativa Lmentioning

confidence: 87%

High-efficiency remediation of Hg and Cd co-contaminated paddy soils by Fe–Mn oxide modified biochar and its microbial community responses

Sun,

Gao,

Yang

et al. 2024

Biochar

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Fe–Mn oxide modified biochar (FMBC) was produced to explore its potential for remediation of Hg–Cd contaminated paddy soils. The results showed that the application of FMBC decreased the contents of bioavailable Hg and Cd by 41.49–81.85% and 19.47–33.02% in contrast to CK, while the amount of labile organic carbon (C) fractions and C-pool management index (CPMI) was increased under BC and FMBC treated soils, indicating the enhancement of soil C storage and nutrient cycling function. Dry weight of different parts of Oryza sativa L. was enhanced after the addition of BC and FMBC, and the contents of Fe and Mn in root iron–manganese plaques (IMP) were 1.46–2.06 and 6.72–19.35 times higher than those of the control groups. Hg and Cd contents in brown rice under the FMBC treatments were significantly reduced by 18.32–71.16% and 59.52–72.11% compared with the control. FMBC addition altered the composition and metabolism function of soil bacterial communities, especially increasing the abundance of keystone phyla, including Firmicutes, Proteobacteria and Actinobacteria. Partial least squares path modelling (PLSPM) revealed that the contents of Na2S2O3–Hg, DTPA–Cd and IMP were the key indicators affecting Hg and Cd accumulation in rice grains. These results demonstrate the simultaneous value of FMBC in remediation of Hg and Cd combined pollution and restoring soil fertility and biological productivity. Graphical Abstract

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Wetlands to Treat Mining Tailings in the Tropics of Central and South America

Pat-Espadas

Amábilis-Sosa

2023

Wetlands for Remediation in the Tropics

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Effects of iron-modified biochar with S-rich and Si-rich feedstocks on Cd immobilization in the soil-rice system

Cited by 20 publications

References 56 publications

The dissolved organic matter from the co-decomposition of Chinese milk vetch and rice straw induces the strengthening of Cd remediation by Fe-modified biochar

The dissolved organic matter from the co-decomposition of Chinese milk vetch and rice straw induces the strengthening of Cd remediation by Fe-modified biochar

High-efficiency remediation of Hg and Cd co-contaminated paddy soils by Fe–Mn oxide modified biochar and its microbial community responses

Wetlands to Treat Mining Tailings in the Tropics of Central and South America

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