Preparation of phosphorus-modified biochar for the immobilization of heavy metals in typical lead-zinc contaminated mining soil: Performance, mechanism and microbial community

Sha, Haichao; Li, Jie; Wang, Liangqin; Nong, Haidu; Wang, Guohua; Zeng, Taofang

doi:10.1016/j.envres.2022.114769

Cited by 29 publications

(6 citation statements)

References 54 publications

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“…The presence of phosphorus-loaded biochar could enhance the affinity and immobilization of heavy metal cations, primarily due to the increased phosphate content. This finding is consistent with previous literature that supports the improved performance of phosphorus-loaded biochar in the adsorption and immobilization of heavy metals (Ahmad et al 2018;Fris ˇta ´k et al 2018;Palansooriya et al 2022;Qi et al 2022a;Sha et al 2023;Yang et al 2021b).…”

Section: Limitations Of Phosphorus-loaded Biochar In Plant Productionsupporting

confidence: 93%

“…Their study also emphasized the importance of high-concentration nitrogen-containing groups in heavy metal immobilization. Phosphates, on the other hand, help remove cadmium, lead, zinc, and copper in the soil, in addition to the positive effects on microbial community in soil, which is supported by Sha et al (2023) reported the effects of phosphorus-loaded biochar addition to mine soil. Heavy metals are immobilized by phosphates from phosphorus-loaded biochar via several mechanisms, including precipitation, electrostatic attraction, and complexation, where precipitation is the main pathway.…”

Section: Phosphorus Sources For Biochar Loadingmentioning

confidence: 62%

“…Additionally, waste-based biomass contributes to sustainable waste management practices by reducing the waste generated and optimizing biochar-derived phosphorus fertilizer. On the other hand, many studies, including Ahmad et al (2018), Fris ˇta ´k et al (2018), Yang et al (2021b), Chen et al (2022), Qi et al (2022a), andSha et al (2023), have reported the ability of the phosphorus loaded biochar to adsorb heavy metals from waste streams and/or immobilize heavy metals in the soil through precipitation, electrostatic attraction, and complexation, which consequently reduce the plant uptake of a water-soluble and exchangeable fraction. Nonetheless, there are unneglectable health and environmental concerns about the deployment of biochar-based phosphorus fertilizer produced from wastes as the chemical composition of the biomasses could vary from one source to another, leading to uncertainty in the potential toxicity of when applied in the soil.…”

Section: Limitations Of Phosphorus-loaded Biochar In Plant Productionmentioning

confidence: 99%

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Machine learning and computational chemistry to improve biochar fertilizers: a review

Osman,

Zhang,

Lai

et al. 2023

Environ Chem Lett

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Traditional fertilizers are highly inefficient, with a major loss of nutrients and associated pollution. Alternatively, biochar loaded with phosphorous is a sustainable fertilizer that improves soil structure, stores carbon in soils, and provides plant nutrients in the long run, yet most biochars are not optimal because mechanisms ruling biochar properties are poorly known. This issue can be solved by recent developments in machine learning and computational chemistry. Here we review phosphorus-loaded biochar with emphasis on computational chemistry, machine learning, organic acids, drawbacks of classical fertilizers, biochar production, phosphorus loading, and mechanisms of phosphorous release. Modeling techniques allow for deciphering the influence of individual variables on biochar, employing various supervised learning models tailored to different biochar types. Computational chemistry provides knowledge on factors that control phosphorus binding, e.g., the type of phosphorus compound, soil constituents, mineral surfaces, binding motifs, water, solution pH, and redox potential. Phosphorus release from biochar is controlled by coexisting anions, pH, adsorbent dosage, initial phosphorus concentration, and temperature. Pyrolysis temperatures below 600 °C enhance functional group retention, while temperatures below 450 °C increase plant-available phosphorus. Lower pH values promote phosphorus release, while higher pH values hinder it. Physical modifications, such as increasing surface area and pore volume, can maximize the adsorption capacity of phosphorus-loaded biochar. Furthermore, the type of organic acid affects phosphorus release, with low molecular weight organic acids being advantageous for soil utilization. Lastly, biochar-based fertilizers release nutrients 2–4 times slower than conventional fertilizers.

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Section: Limitations Of Phosphorus-loaded Biochar In Plant Productionsupporting

confidence: 93%

Section: Phosphorus Sources For Biochar Loadingmentioning

confidence: 62%

Section: Limitations Of Phosphorus-loaded Biochar In Plant Productionmentioning

confidence: 99%

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Machine learning and computational chemistry to improve biochar fertilizers: a review

Osman,

Zhang,

Lai

et al. 2023

Environ Chem Lett

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“…Soil bacterial communities are crucial for nutrient cycling, waste decomposition, and pollutant degradation ( Muhammad et al, 2019 ). The presence of heavy metals not only has adverse effects on the physical and chemical properties of soils but can also change the composition, activity, and function of soil bacterial communities ( Delgado, 2019 ; Chao et al, 2023 ). In turn, the analysis of bacterial community composition can be used to evaluate the effectiveness of the remediation of Cd-contaminated soil ( Hussain et al, 2023 ; Yan et al, 2023 ).…”

Section: Discussionmentioning

confidence: 99%

Biochar and organic fertilizer drive the bacterial community to improve the productivity and quality of Sophora tonkinensis in cadmium-contaminated soil

Liu,

Li,

Lin

et al. 2024

Front. Microbiol.

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Excessive Cd accumulation in soil reduces the production of numerous plants, such as Sophora tonkinensis Gagnep., which is an important and widely cultivated medicinal plant whose roots and rhizomes are used in traditional Chinese medicine. Applying a mixture of biochar and organic fertilizers improved the overall health of the Cd-contaminated soil and increased the yield and quality of Sophora. However, the underlying mechanism between this mixed fertilization and the improvement of the yield and quality of Sophora remains uncovered. This study investigated the effect of biochar and organic fertilizer application (BO, biochar to organic fertilizer ratio of 1:2) on the growth of Sophora cultivated in Cd-contaminated soil. BO significantly reduced the total Cd content (TCd) in the Sophora rhizosphere soil and increased the soil water content, overall soil nutrient levels, and enzyme activities in the soil. Additionally, the α diversity of the soil bacterial community had been significantly improved after BO treatment. Soil pH, total Cd content, total carbon content, and dissolved organic carbon were the main reasons for the fluctuation of the bacterial dominant species. Further investigation demonstrated that the abundance of variable microorganisms, including Acidobacteria, Proteobacteria, Bacteroidetes, Firmicutes, Chloroflexi, Gemmatimonadetes, Patescibacteria, Armatimonadetes, Subgroups_ 6, Bacillus and Bacillus_ Acidiceler, was also significantly changed in Cd-contaminated soil. All these alterations could contribute to the reduction of the Cd content and, thus, the increase of the biomass and the content of the main secondary metabolites (matrine and oxymatrine) in Sophora. Our research demonstrated that the co-application of biochar and organic fertilizer has the potential to enhance soil health and increase the productivity and quality of plants by regulating the microorganisms in Cd-contaminated soil.

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“…Corn stalk biochar impregnated with K 2 HPO 4 was applied to Pb-Zn mining soil, and the soil was incubated for 90 days. Biochar promoted the transformation of Cd, Pb, Zn, and Cu from mobile fractions (exchangeable and carbonate) to stable fractions (organic and residual) as a result of HM precipitation, complexation, and electrostatic interaction [203].…”

Section: Chemically Modified Biocharsmentioning

confidence: 99%

Application of Selected Methods to Modify Pyrolyzed Biochar for the Immobilization of Metals in Soil: A Review

Gusiatin,

Rouhani

2023

Materials

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Soil contamination through heavy metals (HMs) is a serious environmental problem that needs to be addressed. One of the methods of remediating soils contaminated with HMs and reducing the environmental risks associated with them is to immobilize these HMs in the soil using specific amendment(s). The use of biochar as an organic amendment can be an environmentally friendly and practically feasible option, as (i) different types of biomass can be used for biochar production, which contributes to environmental sustainability, and (ii) the functionality of biochar can be improved, enabling efficient immobilization of HMs. Effective use of biochar to immobilize HMs in soil often requires modification of pristine biochar. There are various physical, chemical, and biological methods for modifying biochar that can be used at different stages of pyrolysis, i.e., before pyrolysis, during pyrolysis, and after pyrolysis. Such methods are still being intensively developed by testing different modification approaches in single or hybrid systems and investigating their effects on the immobilization of HMs in the soil and on the properties of the remediated soil. In general, there is more information on biochar modification and its performance in HM immobilization with physical and chemical methods than with microbial methods. This review provides an overview of the main biochar modification strategies related to the pyrolysis process. In addition, recent advances in biochar modification using physical and chemical methods, biochar-based composites, and biochar modified with HM-tolerant microorganisms are presented, including the effects of these methods on biochar properties and the immobilization of HMs in soil. Since modified biochar can have some negative effects, these issues are also addressed. Finally, future directions for modified biochar research are suggested in terms of scope, scale, timeframe, and risk assessment. This review aims to popularize the in situ immobilization of HMs with modified biochar.

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Preparation of phosphorus-modified biochar for the immobilization of heavy metals in typical lead-zinc contaminated mining soil: Performance, mechanism and microbial community

Cited by 29 publications

References 54 publications

Machine learning and computational chemistry to improve biochar fertilizers: a review

Machine learning and computational chemistry to improve biochar fertilizers: a review

Biochar and organic fertilizer drive the bacterial community to improve the productivity and quality of Sophora tonkinensis in cadmium-contaminated soil

Application of Selected Methods to Modify Pyrolyzed Biochar for the Immobilization of Metals in Soil: A Review

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