Systematic Research on the Transport of Ball-Milled Biochar in Saturated Porous Media: Effect of Humic Acid, Ionic Strength, and Cation Types

Cao, Gang; Qiao, Jiachang; Ai, Juehao; Ning, Shuaiqi; Sun, Huimin; Chen, Menghua; Zhang, Lin; Zhang, Guilong; Lian, Fei

doi:10.3390/nano12060988

Cited by 6 publications

(5 citation statements)

References 63 publications

(97 reference statements)

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“…Humic acid adsorbed on nanoparticles and the surface of collectors (soil particles) could cause an increase in the electrostatic repulsion among particles, affecting the stability of colloids and transport behavior of nanoparticles (Cao et al, 2022). As the DLVO interaction energy in the 18~35 and 35~60 mesh soil-packed columns were similar to that in the 10~18 mesh soil-packed columns, we did not show them.…”

Section: Effect Of Ha On the Transport Of Bc-npmentioning

confidence: 80%

“…Natural soil is a complex heterogeneous system, and its solution chemistry, textural composition (sand, silt, and clay content), surface roughness, organic matter content, and other properties can significantly affect the transportability of nanoparticles (Liang et al, 2021;Cao et al, 2022). Therefore, the transport of nanoparticles in well-defined model porous media (e.g., quartz sand, glass bead) may be less suitable for predicting the actual mobility of BC-NP in natural soils.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the transport of nanoparticles in well-defined model porous media (e.g., quartz sand, glass bead) may be less suitable for predicting the actual mobility of BC-NP in natural soils. Previous studies showed that after adding electrolyte into a colloidal system, the electric double layer of colloidal particles will be compressed, and the electrostatic repulsion between nanoparticles will be reduced, thus reducing the stability of the nanoparticles (Yang et al, 2019;Cao et al, 2022). Since soil solution usually contains different concentrations and types of electrolytes, and BC-NP may be surfacemodified by natural organic matter during the transport process, the transport behavior of BC-NP in natural soil is complicated.…”

Section: Introductionmentioning

confidence: 99%

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Effects of soil grain size and solution chemistry on the transport of biochar nanoparticles

Zhang

Meng

Huang

et al. 2023

Front. Environ. Sci.

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Biochar nanoparticles (BC-NP) have attracted significant attention because of their unique environmental behavior, some of which could potentially limit large-scale field application of biochar. Accurate prediction of the fate and transportability of BC-NP in soil matrix is the key to evaluating their environmental influence. This study investigated the effects of soil grain size and environmentally relevant solution chemistry, such as ionic strength (cation concentration, 0.1 mM–50 mM; cation type, Na+, and Ca2+), and humic acid (HA; 0–10 mg/L), on the transport behavior of BC-NP via systematic column experiments. The transportability of BC-NP in the soil-packed column decreased with decreasing soil grain size and was inversely proportional to soil clay content. At low cation concentrations (0.1–1.0 mM), a considerable proportion of BC-NP (15.95%–67.17%) penetrated the soil columns. Compared with Na+, Ca2+ inhibited the transportability of BC-NP in the soil through a charge shielding effect. With increasing HA concentration, the transportability of BC-NP increased, likely due to an enhanced repulsion force between BC-NP and soil particles. However, at a high HA concentration (10 mg/L), Ca2+ bridging reduced the transportability of BC-NP in the soil. Breakthrough curves of BC-NP were explained by the two-site kinetic retention model. The antagonistic effects of ionic strength and HA indicated that the transport behavior of BC-NP in the soil was governed by competitive effects of some environmental factors, including soil grain size, environmental solution chemistry, and natural organic matter content.

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Section: Effect Of Ha On the Transport Of Bc-npmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of soil grain size and solution chemistry on the transport of biochar nanoparticles

Zhang

Meng

Huang

et al. 2023

Front. Environ. Sci.

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“…Cylinder plexiglass columns-10 cm in length and 1.5 cm inner diameter-were used in the experiments. The experimental arrangements were the same as our previous column experiment (Figure S2) [31]. The K + -saturated soil aggregates were carefully dry-packed into the columns, and approximately 16 g soil aggregates were added.…”

Section: Soil Column Experimentsmentioning

confidence: 99%

Soil Aggregate Breakdown with Colloidal Particles Release and Transport in Soil: A Perspective from Column Experiments

et al. 2022

Self Cite

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The strongest fortresses often disintegrate from the inside. Likewise, soil internal forces play a critical role in the initial breakdown process of soil aggregate, thus accelerating soil erosion and the release of soil colloid particles. To date, research on the effect of soil internal forces, especially separating the electrostatic force, and on the process of soil aggregate breakdown with particle release and transport in soil is largely inadequate. Therefore, column experiments were used to investigate the properties of transport and soil particles released from the disintegration of model soil aggregates caused by different levels of electrostatic forces. We found that the increase of electrostatic repulsive pressure was the immediate cause of soil aggregate breakdown, that the highest concentration of released soil particles could reach 808.36 mg L−1, and that the mean particle sizes of the released soil ranged from 100 nm to 300 nm. The particle size distributions and clay mineral composition of the released soil particles were not dominated by the electrostatic force. In practice, the change of external conditions of agricultural soil would lead to the change of soil internal forces, then affect soil aggregate stability. This study aims to provide a micro perspective to understand the release of fine particles from soil matrix and its implication for agricultural soil.

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“…Biochar can be produced from a variety of raw materials, such as corn straw, rice straw, hardwood waste, food waste, and agricultural waste, by pyrolyzing them at the temperature mentioned above [23][24][25][26]. Recently, a ball-milling technique has been developed to produce very fine or nano-sized biochar particles for their application in the efficient removal of pollutants from the environmental matrix [23,27,28]. Biochar is known for its high porosity, functional groups, aromatic character, presence of inorganic elements, and high specific surface, making it a suitable material to be used as a soil ameliorant in contaminated soil [29,30].…”

Section: Introductionmentioning

confidence: 99%

The Role of Modified Biochar for the Remediation of Coal Mining-Impacted Contaminated Soil: A Review

2023

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Land degradation and the release of contaminants such as heavy metals into the environment due to mining activities is a concerning issue worldwide. The bioaccumulation of heavy metals in the environmental matrix can severely damage flora and fauna and negatively impact human health. The poor physicochemical properties of mine spoil generated through mining operations make restoration of such contaminated and degraded lands challenging. In recent years, an exponential growth in the development and applications of biochar and its composites for the remediation of heavy metal-polluted environmental matrices such as soil and water has been observed. The literature review found that 95 review papers were published in the last five years reviewing the utility of biochar for heavy metals removal from the aqueous environment. However, no paper was published focusing on the application of biochar and its composites for the remediation of heavy metal-contaminated coal mine soil. The objective of the present review is to critically review the impact of mining activities on the environment and the role of biochar and its composites in the remediation of heavy metal-contaminated mine soil. This review presented a detailed discussion and sufficient data on the impact of mining practices in India on the environment. In addition, it critically discussed the methods of the production of biochar from various wastes and methods of modifying the pristine biochar to develop functionalized biochar composites. The detailed mechanism through which biochar and its composites remove and immobilize the heavy metals in the soil was discussed. The efficacy of biochar for the remediation of contaminated mine soil was also critically evaluated using various case studies and data from previously published articles. Thus, the major conclusion drawn from the review is that the application of various functionalized biochar composites could effectively manage and remediate heavy metal-contaminated mine soil.

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Systematic Research on the Transport of Ball-Milled Biochar in Saturated Porous Media: Effect of Humic Acid, Ionic Strength, and Cation Types

Cited by 6 publications

References 63 publications

Effects of soil grain size and solution chemistry on the transport of biochar nanoparticles

Effects of soil grain size and solution chemistry on the transport of biochar nanoparticles

Soil Aggregate Breakdown with Colloidal Particles Release and Transport in Soil: A Perspective from Column Experiments

The Role of Modified Biochar for the Remediation of Coal Mining-Impacted Contaminated Soil: A Review

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