Challenges and recent advances in biochar as low-cost biosorbent: From batch assays to continuous-flow systems

Rosales, Emílio; Meijide, Jéssica; Pazos, Marta

doi:10.1016/j.biortech.2017.06.084

Cited by 220 publications

(78 citation statements)

References 91 publications

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“…In the current study, we used Norway spruce biochar in the columns. The N adsorption capacity of the biochar reactor can be significantly affected by the biochar feedstock, treatment temperature, and initial concentration [57]. Under high initial N concentration, the adsorption capacity of wood biochars can reach up to 50-125 mg NH 4 N g −1 biochar and 2-8 mg NO 3 N g −1 biochar [46].…”

Section: Evaluation Of the Experimentsmentioning

confidence: 99%

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Purification of Forest Clear-Cut Runoff Water Using Biochar: A Meso-Scale Laboratory Column Experiment

Lafdani

Saarela

Laurén

et al. 2020

Water

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Biochar can be an effective sorbent material for removal of nutrients from water due to its high specific surface area, porous structure, and high cation and anion exchange capacity. The aim of this study was to test a biochar reactor and to evaluate its efficiency in runoff water purification and consecutive nutrient recycling in clear-cut peatland forests. The goodness of the method was tested in a meso-scale (water volume thousands of liters) reactor experiment by circulating runoff water through wood biochar-filled columns and by determining water nutrient concentrations in the column inlet and outlet. The pseudo-first and second order kinetic models were fitted to the experimental data and the adsorption rate (Kad) and maximum adsorption capacity (Qmax) of the biochar reactor were quantified. The concentration of total nitrogen (TN) decreased by 58% during the 8-week experiment; the majority of TN adsorption occurred within the first 3 days. In addition, NO3-N and NH4-N concentrations decreased below the detection limit in 5 days after the beginning of the experiment. The maximum adsorption capacity of the biochar reactor varied between 0.03–0.04 mg g−1 biochar for NH4-N, and was equal to 0.02 mg g−1 biochar for TN. The results demonstrated that the biochar reactor was not able to adsorb TN when the water TN concentration was below 0.4 mg L−1. These results suggest that a biochar reactor can be a useful and effective method for runoff water purification in clear-cut forests and further development and testing is warranted. Unlike traditional water protection methods in peatland forestry, the biochar reactor can effectively remove NO3-N from water. This makes the biochar reactor a promising water protection tool to be tested in sites where there is the risk of a high rate of nutrient export after forest harvesting or drainage.

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Section: Evaluation Of the Experimentsmentioning

confidence: 99%

“…Adsorption is the main process in the removal of N from water. In the adsorption, ion exchange and electrostatic adsorption occurs between surface functional groups and N fractions [57].…”

Section: Evaluation Of the Experimentsmentioning

confidence: 99%

Purification of Forest Clear-Cut Runoff Water Using Biochar: A Meso-Scale Laboratory Column Experiment

Lafdani

Saarela

Laurén

et al. 2020

Water

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“…Biochar obtained from the pyrolysis of woody biomass can be used for a number of purposes, such as for soil amendment [1][2][3][4], and as a low cost adsorbent [5][6][7][8][9][10]. As far as the former application is concerned, biochar has been demonstrated to improve soil properties [11][12][13][14][15][16][17], as well as to reduce contaminant leaching [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Application of Biochar to the Remediation of Pb-Contaminated Solutions

2018

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BIOTON® biochar, produced by a wood biomass pyrolysis process, which is usually applied as soil amendment, was investigated for a novel application, i.e., the adsorption of lead from contaminated solutions. The experimental activity included physical and chemical characterization of BIOTON®; and Scanning Electron Microscope (SEM) images to highlight its internal structure. The adsorption process was investigated through batch and column experiments. Adsorption kinetics showed very rapid achievement of equilibrium conditions, i.e., 50 mg/L and 100 mg/L initial Pb concentration at 2 h and 4 h, respectively. Complete removal also occurred within the same time. The Brunauer–Emmett–Teller model was a better fit for the equilibrium data of both Pb concentrations, whereas the kinetics were best represented by the pseudo second-order model. Column tests showed that the addition of biochar as an adsorbent media within the bed significantly extended the time of breakthrough and exhaustion, with respect to the column filled with soil only. The values found for the adsorption capacity of BIOTON®- versus lead-containing solutions were comparable to those reported for commercial adsorbents. Therefore, BIOTON® can be considered a valid option: It also offers the additional benefit of allowing the recovery of a residue, which alternately would need to be disposed of.

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“…33,34 For example, the adsorption of hydrophobic organic contaminants (HOCs) on low-temperature biochars that generally contained more hydrophilic groups could be involved in more interactions via specic adsorption including Hbonding and p-p EDA interaction between the aromatic surfaces of carbonaceous adsorbent and adsorbate. 35 In contrast, these surface polar oxygen-containing functional groups were expected to form three-dimensional water clusters via strong H-bonding and then hinder HOCs from approaching the available adsorption sites, in turn, suppressing the adsorption of HOCs by biochars. 30 In addition, the surface polarity of biochar was also found to play an important role in controlling the adsorption of organic contaminants by p-p EDA interactions between electron-rich (p-donor) and p-acceptor sites in organic matter within the biochar.…”

Section: Structure-activity Relationship Between Biochar Physicochemimentioning

confidence: 99%

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

Zhao

Nie

et al. 2019

RSC Adv.

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Challenges and recent advances in biochar as low-cost biosorbent: From batch assays to continuous-flow systems

Cited by 220 publications

References 91 publications

Purification of Forest Clear-Cut Runoff Water Using Biochar: A Meso-Scale Laboratory Column Experiment

Purification of Forest Clear-Cut Runoff Water Using Biochar: A Meso-Scale Laboratory Column Experiment

Application of Biochar to the Remediation of Pb-Contaminated Solutions

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

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