Immobilization on anionic metal(loid)s in soil by biochar: A meta-analysis assisted by machine learning

Zhang, Yinjie; Ren, Meng; Tang, Yiming; Cui, Xuedan; Cui, Jun; Xu, Congbin; Qie, Hantong; Tan, Xiao; Liu, Dongpo; Zhao, Jiashun; Wang, Shuguang; Lin, Aijun

doi:10.1016/j.jhazmat.2022.129442

Cited by 25 publications

(6 citation statements)

References 85 publications

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“…However, due to the complex and diverse nature of soil, biochar and heavy metals, it is difficult to accurately measure the remediation efficiency of heavy metals. Machine learning has been widely reported to predict the efficiency of heavy metal immobilization in biochar-modified soil, which is helpful to determine the best conditions for enhancing heavy metal immobilization in biochar-modified soil (Palansooriya et al 2022;Sun et al 2022;Zhang et al 2022e). Further, a database with 930 data sets on biochar improved soil was created, including 74 biochar and 43 soils (Sun et al 2022).…”

Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

“…In recent years, a number of machine learning applications have emerged for biochar adsorbents (Fig. 1) (Ascher et al 2022;Yang et al 2022a;Zhang et al 2022e;Jeyasubramanian et al 2021), but there is no comprehensive and systematic review from the perspective of the whole process regulation of biochar adsorbents. Summarizing machine learning of biochar adsorbents from the whole process regulation in time is beneficial to promote the integration of machine learning and biochar adsorbents.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis optimization and adsorption modeling of biochar for pollutant removal via machine learning

Zhang

Chen

et al. 2023

Biochar

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Due to large specific surface area, abundant functional groups and low cost, biochar is widely used for pollutant removal. The adsorption performance of biochar is related to biochar synthesis and adsorption parameters. But the influence factor is numerous, the traditional experimental enumeration is powerless. In recent years, machine learning has been gradually employed for biochar, but there is no comprehensive review on the whole process regulation of biochar adsorbents, covering synthesis optimization and adsorption modeling. This review article systematically summarized the application of machine learning in biochar adsorbents from the perspective of all-round regulation for the first time, including the synthesis optimization and adsorption modeling of biochar adsorbents. Firstly, the overview of machine learning was introduced. Then, the latest advances of machine learning in biochar synthesis for pollutant removal were summarized, including prediction of biochar yield and physicochemical properties, optimal synthetic conditions and economic cost. And the application of machine learning in pollutant adsorption by biochar was reviewed, covering prediction of adsorption efficiency, optimization of experimental conditions and revelation of adsorption mechanism. General guidelines for the application of machine learning in whole-process optimization of biochar from synthesis to adsorption were presented. Finally, the existing problems and future perspectives of machine learning for biochar adsorbents were put forward. We hope that this review can promote the integration of machine learning and biochar, and thus light up the industrialization of biochar. Graphical Abstract

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Section: Conclusion and Future Perspectivesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis optimization and adsorption modeling of biochar for pollutant removal via machine learning

Zhang

Chen

et al. 2023

Biochar

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“…14,15 There is no doubt that biochar adsorbents not only have a convenient production process but can also be prepared from a variety of environmental wastes, which has economic and environmental benefits. 16 In addition, the adsorption capacity of biochar for PFAS is satisfactory. 17,18 It is noteworthy that many studies on PFAS adsorption have been based on modified biochar prepared from a single raw material.…”

Section: Introductionmentioning

confidence: 97%

“…The current treatment methods of PFAS in water mainly include oxidation–reduction and adsorption methods. , Adsorption methods are easy to apply in practice owing to their economy and simplicity. At present, biochar and anion-exchange resins are the most researched adsorbents. , There is no doubt that biochar adsorbents not only have a convenient production process but can also be prepared from a variety of environmental wastes, which has economic and environmental benefits . In addition, the adsorption capacity of biochar for PFAS is satisfactory. , It is noteworthy that many studies on PFAS adsorption have been based on modified biochar prepared from a single raw material.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Removal of Polyfluoroalkyl Substances by Simple Modified Biochar: Adsorption Performance and Theoretical Calculation

et al. 2023

Self Cite

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To cope with the widespread polyfluoroalkyl substance (PFAS) pollution in the global aquatic environment, this study prepared an acid-modified biochar adsorbent derived from sludge with satisfactory performance. The theoretical maximum adsorption capacities of the adsorbent for perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic acid (PFOA) were determined to be 72.17 and 45.88 mg·g–1, respectively. The theoretical calculation of the adsorption of biochar surface functional groups with PFOS and PFOA was first performed in this study, and the mechanism of the adsorption process was inferred with a combination of experimental results and redundancy analysis. The adsorption mechanism is composed mainly of the following three aspects: (I) electrostatic interaction between the positively charged biochar and the deprotonated PFAS; (II) hydrogen bonding between anionic species of PFAS and functional groups; and (III) hydrophobic interaction between long-chain hydrophobic PFAS and biochar. Electrostatic interaction plays a major role in the three main adsorption mechanisms under acidic media. Meanwhile, different functional groups have different adsorption energies for PFAS, and CO has the highest adsorption energy. The findings in this work could provide great insights into the adsorption of PFAS on modified biochar as an environmentally friendly adsorbent to promote resource reuse, improve water quality, and ensure human health.

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“…Menaces, such as rapid population growth, lack of agriculture production, soil degradation, soil pollution, air, water, greenhouse gas emissions, expanding rate of waste production, and other problems, urgently need a sustainable solution. The solution should be focused on environmentally friendly substances with the ability to utilize resources comprehensively, such as biochar [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

The Impacts of Biochar-Assisted Factors on the Hydrophysical Characteristics of Amended Soils: A Review

et al. 2023

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Biochar is known as a well-developed porous carbonaceous material with multifunctional abilities that can enhance the physical properties of soils. However, the lack of certainty about the consequences of biochar application to soils has limited its acceptability. Application of biochar can lead to a series of changes in the physical functions of soil, which are crucial in both agricultural and environmental management. The type of feedstock, pyrolysis conditions, size of particles, and rate of amendments are responsible for biochar effectiveness. Concurrently, the physical characteristics of soil, such as particle-size distribution, can intensify the impacts. Beside the physical attributes, the chemical components and interactions between biochar and the soil interface may play an important role. The chemical properties, such as the value of electrical conductivity, pH and zeta potential, are the remarkable parameters in the hydrophysical behavior. The summary proposes that biochar has a great contribution In enhancing the definite range of aggregation formation, reduction of compaction and shear strength frequency and/or intensity, improvement of microorganisms activity, and abundance. Simultaneously, biochar plays a devastating role by filling the pores, blocking the water flow pathways, and inhibiting macro fauna growth. Particle size of biochar as a major factor, and surface functional groups as a minor factor, affect the performance of biochar in improving the hydrophysical properties of amended soils. The increment in the dosage of biochar application is not promising to enhance the physical properties of soils. Therefore, it is necessary to find a balance between the consumption of biochar and promotion of the soil-water dynamic. This review provides an overview of fastidious perspectives on how to achieve an efficient and sustainable use of biochar in hydrophysical properties.

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Immobilization on anionic metal(loid)s in soil by biochar: A meta-analysis assisted by machine learning

Cited by 25 publications

References 85 publications

Synthesis optimization and adsorption modeling of biochar for pollutant removal via machine learning

Synthesis optimization and adsorption modeling of biochar for pollutant removal via machine learning

Enhanced Removal of Polyfluoroalkyl Substances by Simple Modified Biochar: Adsorption Performance and Theoretical Calculation

The Impacts of Biochar-Assisted Factors on the Hydrophysical Characteristics of Amended Soils: A Review

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