Ball-milling synthesis of biochar and biochar–based nanocomposites and prospects for removal of emerging contaminants: A review

Amusat, Sefiu Olaitan; Kebede, Temesgen Girma; Dube, Simiso

doi:10.1016/j.jwpe.2021.101993

Cited by 181 publications

(60 citation statements)

References 142 publications

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“…Slow pyrolysis is a process that takes place at temperatures in the range of 450-500 °C when the biomass is treated thermally over a period more than a few minutes. It is characterized by the slow effervescence of gaseous vapor from the biomass during conventional pyrolysis (Amusat et al 2021). The process generates a higher biochar yield.…”

Section: Pristine Biocharmentioning

confidence: 99%

“…Alkaline modification is a process involving the use of a basic solution to alter the structure of biochar post-or-pre pyrolysis (Amusat et al 2021). Sodium hydroxide (NaOH) and potassium hydroxide (KOH) solutions have been used widely for this modification.…”

Section: Alkali-and Acid-activated Biocharmentioning

confidence: 99%

“…Engineering of biochar with various nanomaterials is likely to pave the way for the production of outstanding biocharbased nanocomposites which generally have combined benefits of both materials (Amusat et al 2021). Biochar-based nanocomposite properties can be improved by incorporating the benefits of nanomaterials with the presence of abundant functional groups in pyrolyzed biochar, such as carboxyl (COOH), hydroxyl (OH) groups, and amino acids.…”

Section: Biochar-based Compositesmentioning

confidence: 99%

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Biochar for the removal of contaminants from soil and water: a review

Qiu

Liu

Ling

et al. 2022

Biochar

381

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Biochar shows significant potential to serve as a globally applicable material to remediate water and soil owing to the extensive availability of feedstocks and conducive physio-chemical surface characteristics. This review aims to highlight biochar production technologies, characteristics of biochar, and the latest advancements in immobilizing and eliminating heavy metal ions and organic pollutants in soil and water. Pyrolysis temperature, heat transfer rate, residence time, and type of feedstock are critical influential parameters. Biochar’s efficacy in managing contaminants relies on the pore size distribution, surface groups, and ion-exchange capacity. The molecular composition and physical architecture of biochar may be crucial when practically applied to water and soil. In general, biochar produced at relatively high pyrolysis temperatures can effectively manage organic pollutants via increasing surface area, hydrophobicity and microporosity. Biochar generated at lower temperatures is deemed to be more suitable for removing polar organic and inorganic pollutants through oxygen-containing functional groups, precipitation and electrostatic attraction. This review also presents the existing obstacles and future research direction related to biochar-based materials in immobilizing organic contaminants and heavy metal ions in effluents and soil. Graphical Abstract

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Section: Pristine Biocharmentioning

confidence: 99%

Section: Alkali-and Acid-activated Biocharmentioning

confidence: 99%

Section: Biochar-based Compositesmentioning

confidence: 99%

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Biochar for the removal of contaminants from soil and water: a review

Qiu

Liu

Ling

et al. 2022

Biochar

381

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“…Modified biochar, which has expanded the application scenarios of biochar materials, is generally obtained from pristine biochar after simple treatments [ 9 , 13 ]. Among them, ball milling has been proven to be an environmentally friendly engineering method by applying the theory of mechanochemistry, which greatly reduced the particle size, increased the specific surface area, and exposed more active edge sites of biochar, thus improving its adsorption ability [ 14 , 15 , 16 ]. Over the past few years, a considerable number of studies have emerged that have indicated that the adsorption capacity of ball-milled biochar (BMBC) for heavy metals (e.g., Pb, Cd, Ni, Hg), dyes (methylene blue, methyl orange, rhodamine b, etc.…”

Section: Introductionmentioning

confidence: 99%

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

Cao

Qiao

et al. 2022

Nanomaterials

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Ball-milled biochar (BMBC) is a typical engineering material that has promising application prospects in remediating contaminated soil and water. It is fundamental to rate the transport behaviors of BMBC in the underground environment before extensive use. In this study, the effects of the ubiquitous cations (Na+, Mg2+, and Al3+) and model organic matter (humic acid) on the transport of BMBC were investigated using laboratory column experiments. The results demonstrated the facilitated effect of HA on the transport of BMBC due to the negatively charged surface and steric effect under neutral conditions. HA and ionic strength manifested an antagonistic effect on the transport of BMBC, where the presence of one could weaken the effect from the other. We also found the charge reversal of the BMBC surface in the presence of Mg2+, thus enhancing the deposition of BMBC onto the medium surface. On the other hand, the charge reversal from Al3+-coupled acid conditions led to the restabilization and transport of BMBC in porous media. Therefore, the rational usage of BMBC is indispensable and more attention should be paid to the composition and change in underground water that might facilitate the transport of BMBC and thus lead to negative environmental implications.

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“…The speci c surface area gives also a signi cant effect on the adsorption of various organic pollutants (Guo et al 2017). Ballmilling method, as one of the methods to improve the absorbent properties, is a cost-effective way to increase the speci c surface area of carbon materials, therefore, ball-milled biochar has a good adsorption effect on heavy metals, dyes and organic pollutants in water and wastewater (Amusat et al 2021; Xiang et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Characteristics of ball-milled PET plastic char for adsorption of different types of aromatic organic pollutants

Mun

Liu

et al. 2022

Preprint

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Ball-milled plastic char (BMPC) was manufactured by ball-milling of native plastic char (PC) that was synthesized via slow pyrolysis of PET water bottle waste, by which the adsorption characteristics of aqueous phenanthrene, phenol and 2,4,6-trichlorophenol, and its possible mechanisms were investigated. The special surface area of BMPCs increased obviously as the pyrolysis temperature increased, forming large functional groups compared to PCs. Boehm titration showed that total acidic groups of BMPCs decreased significantly with the increase of pyrolysis temperature. The sorption kinetics of three adsorbates was adequately simulated by Pseudo second-order model (R2＞0.99). Langmuir model fitted well the adsorption isotherms of phenanthrene and phenol, while Freundlich model simulated the adsorption isotherm of 2,4,6-trichlorophenol. The adsorption amount of phenanthrene, phenol and 2,4,6-trichlorophenol increased significantly as the pyrolysis temperature increased. The maximum BMPCs adsorption amount reached 21.9mg/g (for phenanthrene), 106mg/g (for phenol) and 303mg/g (for 2,4,6-trichlorophenol) at 25℃ in aqueous solution. FTIR analysis suggested that surface sorption based π-π interaction was dominant mechanism of phenanthrene adsorption, meanwhile, H-bonding between O-containing groups on BMPCs and hydroxyl groups of absorbates was responsible for phenol and 2,4,6-TCP removal. This paper shows that BMPCs can be used as adsorbent for treating aromatic compounds in aqueous environment, and has an economic worth of application.

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Ball-milling synthesis of biochar and biochar–based nanocomposites and prospects for removal of emerging contaminants: A review

Cited by 181 publications

References 142 publications

Biochar for the removal of contaminants from soil and water: a review

Biochar for the removal of contaminants from soil and water: a review

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

Characteristics of ball-milled PET plastic char for adsorption of different types of aromatic organic pollutants

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