Synergistic effect of floatable hydroxyapatite-modified biochar adsorption and low-level CaCl2 leaching on Cd removal from paddy soil

Shi, Yao; Zhao, Zezhou; Zhong, Yi; Hou, Huijie; Chen, Jing; Wang, Linling; Wu, Xiaohui; Crittenden, John C.

doi:10.1016/j.scitotenv.2021.150872

Cited by 21 publications

(2 citation statements)

References 48 publications

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“…Former study has verified the function of biochar to mitigate Cd contamination in water and soil through mechanisms such as adsorption, complexation, and precipitation (Abbas et al 2017;Yin et al 2016). Nevertheless, due to the limited stabilization performance of pristine biochar on heavy metals (Shaheen et al 2022), modified or functionalized biochar is gradually emerging as the novel amendment with outstanding immobilization effect on Cd (Qu et al 2022a;Shi et al 2022). Fe-modified biochar (FB) could enhance the sorption sites for Cd due to its rich mesoporous structure and abundant functional groups (Irshad et al 2022;Zhu et al 2020).…”

Section: Introductionmentioning

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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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: Introductionmentioning

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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“…Biochar modi cation treatments mainly include physical modi cation, chemical modi cation, and biological modi cation (Rajapaksha et al 2016). Chemical modi cation has been widely promoted by experimental research and practical application because of the signi cant improvement in its repair effect on heavy metals (Wang et al 2022;An et al 2021;Shi et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Passivation Remediation of Cadmium Contaminated Soil by Polyethyleneimine Modified Biochar

Wang

et al. 2022

Preprint

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Biochar was prepared from tobacco straws, and polyethyleneimine (PEI) was loaded on the biochar surface to produce PEI-modified biochar (PBC). The remediation effect of PBC on Cd-contaminated soil was studied. During the soil incubation, soil samples were collected three times at 30, 60 and 90 days, and the physical and chemical properties of soil and the contents of heavy metals were determined after natural drying. After conducting passivation and remediation of Cd-contaminated soil, the available Cd content decreased significantly, the residual and oxidizable heavy metal Cd contents in the soil increased significantly, and the weak acid extractable Cd content decreased. When the PBC addition amount was 3% and the soil was cultured for 90 d, the available Cd content in the soil decreased by 54.36%, the weak acid extractable Cd content decreased by 35.36%, and the residual Cd content increased by 184.67%. This indicates that PBC can be used to repair heavy metal-contaminated soil and reduce the bioavailability, migration, and transformation ability of heavy metal Cd.

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Nanoscale Hydroxyapatite for Heavy Metal Removal in Agricultural Soils

Júnior

Fagundes

Riella

et al. 2022

Encyclopedia of Green Materials

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Synergistic effect of floatable hydroxyapatite-modified biochar adsorption and low-level CaCl2 leaching on Cd removal from paddy soil

Cited by 21 publications

References 48 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

Passivation Remediation of Cadmium Contaminated Soil by Polyethyleneimine Modified Biochar

Nanoscale Hydroxyapatite for Heavy Metal Removal in Agricultural Soils

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