Effects of biochar on the dynamic immobilization of Cd and Cu and rice accumulation in soils with different acidity levels

Chen, Le; Guo, Lin; Liao, Ping; Xiong, Qiangqiang; Deng, Xueyun; Gao, Hui; Wei, Haiyan; Dai, Qigen; Pan, Xiaohua; Zeng, Yongjun; Zhang, Hongcheng

doi:10.1016/j.jclepro.2022.133730

Cited by 18 publications

(5 citation statements)

References 41 publications

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“…Furthermore, the contents of Hg and Cd in grains had a significant negative correlation with soil pH, DOC and DCB-Fe and DCB-Mn content (P < 0.01) and a significant positive correlation with Na 2 S 2 O 3 -Hg and DTPA-Cd contents (P < 0.01). Consistent with previous results, biochar and modified biochar materials can reduce the soil-available HM concentrations and transform them into stable compounds that are not readily adsorbed crops (Chen et al 2022a).…”

Section: Correlations Between Environmental Factors and Bacterial Com...supporting

confidence: 91%

“…Moreover, the addition of FMBC increased soil pH and decreased soil Eh, further reducing the availability and mobility of HMs, thereby inhibiting the migration of Hg and Cd from the soil to rice plants (Li et al 2022a). Furthermore, reductions in available Hg and Cd may be associated with the soil microbial community (Chen et al 2022a).…”

Section: Soil Hg and CD Bioavailability And Fractionationmentioning

confidence: 99%

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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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Section: Correlations Between Environmental Factors and Bacterial Com...supporting

confidence: 91%

Section: Soil Hg and CD Bioavailability And Fractionationmentioning

confidence: 99%

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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“…It is due to the interaction between biochar and plant roots that began to be established (Joseph et al, 2021). Meanwhile, the previous research conducted by Chen et al (2022) showed that it takes almost two years to maximize biochar in reducing Cu and Cd contents. In rice, after four years of biochar application, its effectiveness can only be felt because it can help the work of four bacteria in adding nutrients and immobilizing heavy metals.…”

Section: Discussionmentioning

confidence: 99%

Utilization of banana waste biochar to reduce heavy metal contamination in soil and maize plants

Wedayani,

Rai,

Mahardika

et al. 2024

J. Degrade. Min. Land Manage.

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There are indications of heavy metal contamination in soil and agricultural products on paddy fields in Subak Kerdung, Bali. Soil amendments are needed to reduce heavy metal content in contaminated soil to minimize heavy metals in plants. Biochar that contains high organic carbon material and is highly resistant to decomposition is claimed to inhibit and reduce the content of heavy metals in soil and plants. Banana wastes containing cellulose and lignin are considered good as biochar raw materials. This research that aimed to observe the ability of banana waste biochar to reduce heavy metals in soil taken from Subak Kerdung, Bali, was conducted in a greenhouse using maize plants as control plants. The treatments tested consisted of two factors. The first factor was the type of banana waste as biochar-making material consisting of banana stem biochar, banana peel biochar, banana fruit bunch biochar, and mixed biochar (banana stem + banana peel + banana fruit bunch). The second factor was the biochar dosage, which consists of four contents, namely 0 t/ha, 5 t/ha, 10 t/ha, and 15 t/ha. All treatment combinations were arranged in a two-factor, randomized block design with three replications. The results showed that mixed biochar (banana stem + banana peel + banana fruit bunch) effectively reduced Pb and Cu in maize plants. In contrast, banana peel biochar could optimally reduce Cd content in soil and its content in plants. Based on the dose, 15 t/ha of mixed biochar reduced Pb and Cd contents, while 10 t/ha of mixed biochar reduced Cu content.

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“…For example, biochar can effectively reduce water-soluble heavy metal contents in acid mining soil and the uptake of HMs in plants, but the effect of biochar is not notable for alkaline mining soil [37]. The effect of biochar produced from rice straw on Cd and Cu immobilization and bioavailability in soils with different acidity levels has been studied [38]. It was shown that rice straw biochar can be used for Cd pollution control in rice grain grown in paddy soil with varied acidity levels.…”

Section: Discussionmentioning

confidence: 99%

Development of a Unique Technology for the Pyrolysis of Rice Husk Biochar for Promising Heavy Metal Remediation

et al. 2022

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Due to anthropogenic activities, potentially toxic elements cause severe soil pollution worldwide. Therefore, remediation of contaminated soils is exigent and imperative. One cost-effective and environmentally friendly remediation approach is the application of biochar, which is a solid carbonaceous material. Biochar degrades slowly in soil and can persist there for thousands of years, according to various estimations. In addition, coal obtained from crop wastes has a developed porous structure, a high specific surface area, and does not contain toxic compounds such as heavy metals and polycyclic aromatic hydrocarbons. Biochar with optimal values for specific surface area and porosity was obtained from rice husk by stepwise pyrolysis. The pyrolysis parameters such as the heating rate (11 °C∙min–1), temperature (700 °C), and holding time (45 min) were established. At the same time, the surface area of the biochar increased by almost three times with a change in the pyrolysis conditions. As a part of this research, the efficacy of adsorption of Cu(II) from Haplic Chernozem using biochar made from rice husk was examined. The Langmuir and Freundlich models were employed to describe the adsorption data. The isotherm data of heavy metals was better fitted to the Langmuir adsorption model. The addition of rice husk biochar to the soil presented greater removal efficiencies of Cu(II) than soil in pure form. The analysis of the structural characteristics of the sorbent suggest that this material may work efficiently for the restoration of contaminated soil.

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Effects of biochar on the dynamic immobilization of Cd and Cu and rice accumulation in soils with different acidity levels

Cited by 18 publications

References 41 publications

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

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

Utilization of banana waste biochar to reduce heavy metal contamination in soil and maize plants

Development of a Unique Technology for the Pyrolysis of Rice Husk Biochar for Promising Heavy Metal Remediation

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