Characterizing Biochar as Alternative Sorbent for Oil Spill Remediation

Silvani, Ludovica; Vrchotová, Blanka; Kaštánek, Petr; Demnerova, Kateřina; Pettiti, Ida; Papini, Marco Petrangeli

doi:10.1038/srep43912

Cited by 54 publications

(30 citation statements)

References 44 publications

(55 reference statements)

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“…Adsorption is also an alternative valorization route of gasification chars for substitution of activated carbons, since they were reported to have similar carbon content and pore structure as activated carbon [79]. As such, gasification chars may find applications in such as heavy metals adsorption or oil-spill remediation [176,177].…”

Section: Gasificationmentioning

confidence: 99%

State-of-the-Art Char Production with a Focus on Bark Feedstocks: Processes, Design, and Applications

Şen

Pereira

2021

Processes

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In recent years, there has been a surge of interest in char production from lignocellulosic biomass due to the fact of char’s interesting technological properties. Global char production in 2019 reached 53.6 million tons. Barks are among the most important and understudied lignocellulosic feedstocks that have a large potential for exploitation, given bark global production which is estimated to be as high as 400 million cubic meters per year. Chars can be produced from barks; however, in order to obtain the desired char yields and for simulation of the pyrolysis process, it is important to understand the differences between barks and woods and other lignocellulosic materials in addition to selecting a proper thermochemical method for bark-based char production. In this state-of-the-art review, after analyzing the main char production methods, barks were characterized for their chemical composition and compared with other important lignocellulosic materials. Following these steps, previous bark-based char production studies were analyzed, and different barks and process types were evaluated for the first time to guide future char production process designs based on bark feedstock. The dry and wet pyrolysis and gasification results of barks revealed that application of different particle sizes, heating rates, and solid residence times resulted in highly variable char yields between the temperature range of 220 °C and 600 °C. Bark-based char production should be primarily performed via a slow pyrolysis route, considering the superior surface properties of slow pyrolysis chars.

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Section: Gasificationmentioning

confidence: 99%

State-of-the-Art Char Production with a Focus on Bark Feedstocks: Processes, Design, and Applications

Şen

Pereira

2021

Processes

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“…However, these parameters can be designed in order to obtain a material with desired characteristics which often entails a high SA and high porosity 11,30 . The amendment of BC to water 10,13,21,28 , soil 14,21 and sediment 31 for the remediation of metals and organic contaminants has been demonstrated.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…The Freundlich isotherm (equation 2) was used to model sorption as has been carried out previously 11,13,14,28,30,40 .…”

Section: Sorption Isothermsmentioning

confidence: 99%

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Sorption of α-, β-, γ- and δ-hexachlorocyclohexane isomers to three widely different biochars: Sorption mechanisms and application

Silvani

Cornelissen

2019

Chemosphere

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Within this study different biochars (BC) with widely varying characteristics have been tested as materials for the adsorption of hexachlorocyclohexane's (HCH) isomers (α, β, γ and δ) from water. Three BCs produced from digestate (700 ºC), greenhouse tomato waste (550 ºC) and durian shell (400 ºC) were tested. The BCs demonstrated variable physico-chemical characteristics, especially with respect to surface area, with CO 2-surface area ranging from 5.4 to 328.6 m 2 g-1 and iron content ranging from 0.0733 to 11.17 g kg-1. Isotherm tests were carried out to understand which mechanisms drive HCH uptake to BC, to assess whether stereochemistry affects adsorption and to assess whether competitive sorption occurs. Log K F values ranged from 3.7 to 5.8 (µg kg-1) (µg L-1)-n for the various isomers on the three biochars. No competition (t-test, P < 0.0001) was observed between α-, β-, γand δ-HCH. Freundlich adsorption constants of α-, γand δ-HCH followed the order: BC digestate > BC greenhouse tomato waste > BC durian shell, in contrast to β-HCH which followed the order: BC durian shell > BC greenhouse tomato waste > BC digestate. In addition to stereochemistry, sorption

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“…Until date, questions are still being raised whether biochar is a source or a sink of organic and inorganic contaminants (Hilber et al 2017b). However, the majority of these studies have suggested that biochar has the ability to sorb most organic and inorganic contaminants from soil and water at rates depending mainly on specific biochar properties as underpinned by the type of biomass material used and pyrolysis temperature applied (Fabietti et al 2010;Silvani et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Advances in research on the use of biochar in soil for remediation: a review

et al. 2018

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Purpose Soil contamination mainly from human activities remains a major environmental problem in the contemporary world. Significant work has been undertaken to position biochar as a low-cost material useful for the management of contaminants in various environmental media notably soil. Here, we review the increasing research on the use of biochar in soil for the remediation of some organic and inorganic contaminants. Materials and methods Bibliometric analysis were carried out within the past 10 years to determine the increasing trend in research related to biochar in soil for contaminant remediation. Five exemplar contaminants were reviewed in both laboratory and field-based studies. These included two inorganic (i.e. As and Pb), and three organic classes (i.e. sulfamethoxazole, atrazine, and PAHs). The contaminants were selected based on bibliometric data and as representatives of their various contaminant classes. For example, As and Pb are potentially toxic elements (anionic and cationic, respectively) while sulfamethoxazole, atrazine, and PAHs represent antibiotics, herbicides and hydrocarbons, respectively. Results and discussion The interaction between biochar and contaminants in soil is largely driven by biochar precursor material and pyrolysis temperature as well as some characteristics of the contaminants such as octanolwater partition coefficient (KOW) and polarity. The structural and chemical characteristics of biochar in turn determine the major sorption mechanisms and define biochar's suitability for contaminant sorption. Based on the reviewed literature, a soil treatment plan is suggested to guide the application of biochar in various soil types (paddy soils, brownfield and mine soils) at different pH levels (4-5.5) and contaminant concentrations (< 50 and > 50 mg kg-1). Conclusions Research on biochar has grown over the years with significant focus on its properties, and how these affect biochar's ability to immobilize organic and inorganic contaminants in soil. Few of these studies have been field-based. More studies with greater focus on field-based soil remediation are therefore required to fully understand the behavior of biochar under natural circumstances. Other recommendations are made aimed at stimulating future research in areas where significant knowledge gaps exist.

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Characterizing Biochar as Alternative Sorbent for Oil Spill Remediation

Cited by 54 publications

References 44 publications

State-of-the-Art Char Production with a Focus on Bark Feedstocks: Processes, Design, and Applications

State-of-the-Art Char Production with a Focus on Bark Feedstocks: Processes, Design, and Applications

Sorption of α-, β-, γ- and δ-hexachlorocyclohexane isomers to three widely different biochars: Sorption mechanisms and application

Advances in research on the use of biochar in soil for remediation: a review

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