Transport of micro/nano biochar in quartz sand modified by three different clay minerals

Liu, Yiman; Sun, Huimin; Sun, Jiaxue; Meng, Xiangmin; Jiang, Yanji; Wang, Nong

doi:10.1080/26395940.2021.1932605

Cited by 6 publications

(1 citation statement)

References 31 publications

(35 reference statements)

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“…Multiple column simulation experiments were previously performed to investigate the effects of hydraulic, porous media properties, solution chemistry, physicochemical properties, and mineral coating of BC-NP on the transport and retention of BC-NP in porous media (Chen et al, 2017;Wang et al, 2019;Liu et al, 2021). The results of these studies showed that BC-NP had high transportability in porous media with low ionic strength and high pore water velocity, or in the presence of natural organic compounds and surfactants.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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Evaluation of performances of cadmium adsorption onto nano- and macro-biochar-treated alkaline sandy soil from aqueous solutions

Ramezanzadeh,

Reyhanitabar,

Oustan

et al. 2023

Int. J. Environ. Sci. Technol.

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Experimental and numerical investigations of biochar-facilitated Cd2+ transport in saturated porous media: role of solution pH and ionic strength

Zhou

Bao²,

Chen³

et al. 2023

Biochar

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The nanoscale biochar (N-BC) generated during the production and weathering of bulk biochar has caused significant concerns for its cotransport with contaminants spreading the contamination. In this study, the cotransport behaviors of N-BC with Cd2+ under variable solution chemistry were investigated for the first time, which can pose environmental contamination risks but have received little attention. The column experiment results showed that increasing ionic strength (IS) or decreasing pH retarded the transport of N-BC but promoted the transport of Cd2+ in their individual transport. In cotransport scenarios, Cd2+ facilitated the deposition of N-BC on the quartz sand with increasing IS or decreasing pH by providing additional sorption sites and led to the ripening of N-BC via cation bridging. N-BC retarded the transport of Cd2+ under all conditions. However, lower pH and higher IS could facilitate the release of Cd2+ from the immobile N-BC. The cotransport modeling results demonstrated that the Cd2+ adsorption on and desorption from the immobile N-BC controlled the retention and release of Cd2+ under variable pH and IS, while the influence of mobile N-BC on Cd2+ transport was minor. This study provided new insight for evaluating the potential contamination-spreading risks and suggested that rational use of biochar with great caution is necessary. Graphical Abstract

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Transport of micro/nano biochar in quartz sand modified by three different clay minerals

Cited by 6 publications

References 31 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

Evaluation of performances of cadmium adsorption onto nano- and macro-biochar-treated alkaline sandy soil from aqueous solutions

Experimental and numerical investigations of biochar-facilitated Cd2+ transport in saturated porous media: role of solution pH and ionic strength

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