Quantitative evaluation of relationships between adsorption and partition of atrazine in biochar-amended soils with biochar characteristics

Zhao, Zhendong; Wu, Qianqian; Nie, Tiantian; Zhou, Wenjun

doi:10.1039/c8ra08544g

Cited by 38 publications

(17 citation statements)

References 41 publications

(50 reference statements)

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“…The organic O content increased at 500 • C; however, it was reduced to 800 • C. This indicates that BC-500 contained a higher concentration of oxygenated functional groups compared to BC-800. The O/C and (N+O)/C ratios are closely connected to the polarity and hydrophobicity of biochar [60]. As these ratios increase, biochar becomes more polar and therefore less hydrophobic.…”

Section: Biochar Characterizationmentioning

confidence: 99%

Adsorption of Arsenic on Fe-Modified Biochar and Monitoring Using Spectral Induced Polarization

Kirmizakis

Tawabini

Siddiq

et al. 2022

Water

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This work demonstrates the potential of Fe-modified biochar for the treatment of arsenic (As) simulated wastewater and the monitoring of adsorption in real-time. Specifically, we propose the utilization of date-palm leaves for the production of biochar, further modified with Fe in order to improve its adsorption function against inorganic pollutants, such as As. Both the original biochar and the Fe-modified biochar were used for adsorption of As in laboratory batch and column experiments. The monitoring of the biochar(s) performance and As treatment was also enhanced by using the spectral induced polarization (SIP) method, offering real-time monitoring, in addition to standard chemical monitoring. Both the original and the Fe-modified biochar achieved high removal rates with Fe-modified biochar achieving up to 98% removal of As compared to the 17% by sand only (control). In addition, a correlation was found between post-adsorption measurements and SIP measurements.

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Section: Biochar Characterizationmentioning

confidence: 99%

Adsorption of Arsenic on Fe-Modified Biochar and Monitoring Using Spectral Induced Polarization

Kirmizakis

Tawabini

Siddiq

et al. 2022

Water

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“…Smaller pores have higher surface energy, and therefore sorption of organic pollutants occurs first in biochar micropores (Uchimiya et al, 2010b). At low surface coverage [i.e., equilibrium solute concentration (Ce) to solute water solubility (Sw) ratio ≤0.2], non-linear, competitive adsorption of organic solutes into micropores in biochar's carbonized porous surface is dominant; at higher surface coverage (i.e., Ce/Sw >0.2), the adsorption shifts increasingly to linear, non-competitive partition into biochar's uncarbonized C moiety (Uchimiya et al, 2010b;Chiou et al, 2015;Zhao et al, 2019). Pore filling ("in-pore" surface adsorption) was suggested as an important mechanism for biochar adsorbing organic compounds (Figure 4).…”

Section: Mechanismsmentioning

confidence: 99%

“…Pore filling ("in-pore" surface adsorption) was suggested as an important mechanism for biochar adsorbing organic compounds (Figure 4). Research indicates that the extent of surface adsorption is proportionally related to biochar's SSA and surface porosity as well as aromaticity (Zhu et al, 2014), while the capacity of partition adsorption is dependent on biochar's OC content and mineral ash content (Chiou et al, 2015;Zhao et al, 2019). The hydrophobic effect (avoidance of non-polar molecules and hydrophobic molecular moieties from contacting water) also facilitates the sorption of hydrophobic organic pollutants by biochar (Tan et al, 2015).…”

Section: Mechanismsmentioning

confidence: 99%

Biochar-Facilitated Soil Remediation: Mechanisms and Efficacy Variations

Guo

Song

Tian

2020

Front. Environ. Sci.

171

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Recent research suggests that biochar amendment is a promising approach to mitigate soil contamination via immobilizing heavy metals and organic pollutants. Through intensive literature review, this paper was aimed to better understand the processes, mechanisms, and effectiveness of biochar in immobilizing chemical contaminants in soil. The quality characteristics of biochar as a soil amendment varied greatly with the feedstock materials and the pyrolysis conditions. Biochar products from different sources demonstrated remarkably diversified capacities and efficiencies for stabilizing soil contaminants. Soil-incorporated biochar was able to stabilize Cd, Cu, Ni, Pb, and Zn and reduce their bioavailability through enhanced sorption (based on electrostatic attraction, ion exchange, and surface complexation) and chemical precipitation (incurred from soil pH elevation and ash addition of carbonates and phosphates). The stabilization efficacy was largely determined by cation exchange capacity, pH, and ash content of the biochar. Biochar amendment increased the mobility of anionic toxic elements [e.g., CrO 2− 4 , AsO − 3 , and Sb(OH) − 6 ] in soil. Soil-incorporated biochar was also able to adsorb non-polar organic compounds (through pore filling, partition, and hydrophobic effect) and polar organic compounds (via H-bonding, electrostatic attraction, specific interaction, and surface precipitation). The adsorption efficiency was controlled by the biochar surface properties specific surface area, microporosity, and hydrophobicity. Biochar may facilitate the mineralization of organic pollutants by enhancing soil microbial activities. The effectiveness of biochar-facilitated soil remediation was case specific, changing with the biochar source, amendment rate, placement, soil type, and pollutant species. More field studies are needed to evaluate the long-term effectiveness of biochar-facilitated soil remediation under practical circumstances.

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“…To explore the adsorption mechanism of DEA in soil and BC soil, Eqs. 10 through 13 were used to quantify the relative contribution of DEA partitioning and surface adsorption for the three types of soil and BC soil (Zhao et al 2019),…”

Section: Discussionmentioning

confidence: 99%

Effects of tall fescue biochar on the adsorption behavior of desethyl-atrazine in different types of soil

Shan

Fan

et al. 2021

BioRes

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Desethyl-atrazine (DEA) is a metabolite of atrazine that exerts a considerable influence on the environment. In this study, tall fescue biochar was prepared by pyrolysis at 500 °C, and batch experiments were conducted to explore its effect on the adsorption behavior of DEA in red soil, brown soil, and black soil. The addition of biochar increased the equilibrium amount of DEA adsorption for the three soil types. A pseudo-second-order kinetic model most closely fit the DEA adsorption kinetics of the three soils with and without biochar, with a determination coefficient (R2) of 0.962 to 0.999. The isothermal DEA adsorption process of soils with and without biochar was optimally described by the Freundlich and Langmuir isothermal adsorption models with R2 values of 0.98 and above. The DEA adsorption process in the pristine soil involved an exothermic reaction, which became an endothermic reaction after the addition of biochar. Partitioning was dominant throughout the entire DEA adsorption process of the three pristine soils. Conversely, in soils with biochar, surface adsorption represented a greater contribution toward DEA adsorption under conditions of low equilibrium concentration. The overall results revealed that the tall fescue biochar was an effective adsorbent for DEA polluted soil.

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Quantitative evaluation of relationships between adsorption and partition of atrazine in biochar-amended soils with biochar characteristics

Abstract: Adsorption of atrazine (ATZ) in two natural soils amended with different biochars was investigated, and the relationships of adsorption capacity of biochar-amended soils with biochar characteristics were also quantitatively evaluated.

Cited by 38 publications

References 41 publications

Adsorption of Arsenic on Fe-Modified Biochar and Monitoring Using Spectral Induced Polarization

Adsorption of Arsenic on Fe-Modified Biochar and Monitoring Using Spectral Induced Polarization

Biochar-Facilitated Soil Remediation: Mechanisms and Efficacy Variations

Effects of tall fescue biochar on the adsorption behavior of desethyl-atrazine in different types of soil

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