Biochar catalyzed dechlorination – Which biochar properties matter?

Ai, Jing; Lu, Changyong; Berg, Frans W.J. van den; Yin, Weizhao; Strobel, Bjarne W.; Hansen, Hans Christian Bruun

doi:10.1016/j.jhazmat.2020.124724

Cited by 35 publications

(11 citation statements)

References 78 publications

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“…As expected, for PWBC the 95.84 wt% of the mass was C; 3.92 wt% O; 0.10 wt% S; 0.09 and 0.04 wt% of K and Mg (complete data in Figure S3). This is consistent with results concerning wood based biochar [45][46][47]. At high processing temperature, wood based feedstock may reach a carbon content greater than 95% and oxygen content less than 5% [8].…”

Section: Adsorption Test In Batch Reactorssupporting

confidence: 92%

“…The performance of the BC enriched with Fe was attractive, as more than one removal mechanism may be implicated [34]. Recent papers have described the reduction of organic contaminants on the ZVI/BC magnetic surface [45,[50][51][52]. In contrast, no intermediates of TCE reduction were revealed in the range of concentration investigated in our study.…”

Section: Adsorption Test In Batch Reactorsmentioning

confidence: 53%

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Biochar from Pine Wood, Rice Husks and Iron-Eupatorium Shrubs for Remediation Applications: Surface Characterization and Experimental Tests for Trichloroethylene Removal

et al. 2021

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Nowadays porous materials from organic waste, i.e., Biochar (BC), are receiving increased attention for environmental applications. This study adds information on three BCs that have undergone a number of studies in recent years. A Biochar from pine wood, one from rice husk and one from Eupatorium shrubs enriched with Iron, labelled as PWBC, RHBC and EuFeBC respectively, are evaluated for Trichloroethylene (TCE) removal from aqueous solution. Physical-chemical description is performed by SEM-EDS and BET analysis. The decrease of TCE over time follows a pseudo-second order kinetics with increased removal by the PWBC. Freundlich and Langmuir models well fit equilibrium test data. The optimized values of the maximum adsorbed amount, qmax (mg g−1), follows this order 109.41 PWBC > 30.35 EuFeBC > 21.00 RHBC. Fixed-bed columns are also carried out. Best performance is again achieved by PWBC, which operates for a higher number of pore volume, followed by EuFeBC and RHBC. Continuous testing confirms batch studies and makes it possible to evaluate the workability of materials in configurations closer to reality. Results are promising for potential environmental application. In particular, the characterization of several classes of contaminants opens the doors to possible uses in mixed contamination cases.

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Section: Adsorption Test In Batch Reactorssupporting

confidence: 92%

Section: Adsorption Test In Batch Reactorsmentioning

confidence: 53%

Biochar from Pine Wood, Rice Husks and Iron-Eupatorium Shrubs for Remediation Applications: Surface Characterization and Experimental Tests for Trichloroethylene Removal

et al. 2021

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“…Except for the abovementioned dithiothreitol, which gives similar rate constants to the sulfides (Table S1), other reductants that have been mentioned above also achieve high performance under catalysis by carbon materials. Among them, GR should be highlighted because reduction rate constants (k SA ) of tetrachloroethene (PCE) and trichloroethylene (TCE) in GR-biochar systems were found to be more than one and two orders of magnitude higher than those in systems using sulfide as a reductant, respectively (Ai et al, 2019;Ai et al, 2020;Ai et al, 2021). GR has also been reported to catalyze the dechlorination of carbon tetrachloride when GO was used as the catalyst (Huang et al, 2017), whereas GR alone has little reactivity towards these halogenated compounds.…”

Section: Performance Of Carbon Materialsmentioning

confidence: 99%

“…Moreover, the electrical conductivity and the prevalence of quinone moieties could be balanced through controlling pyrolysis temperature during the production of carbon materials. This method was common for pursuing a higher catalytic activity of carbon materials, and the graphitization degree and oxygen content of carbon materials would increase and drop, respectively, with the increased pyrolysis temperature (Ai et al, 2021).…”

Section: Modification Of Carbon Materialsmentioning

confidence: 99%

Abiotic reductive removal of organic contaminants catalyzed by carbon materials: A short review

Qin

Sun

Rao

et al. 2021

Water Environment Research

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Since the observation that carbon materials can facilitate electron transfer between reactants, there is growing literature on the abiotic reductive removal of organic contaminants catalyzed by them. Most of the interest in these processes arises from the participation of carbon materials in the natural transformation of contaminants and the possibility of developing new strategies for environmental treatment and remediation. The combinations of various carbon materials and reductants have been investigated for the reduction of nitro-organic compounds, halogenated organics, and azo dyes. The reduction

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“…The general mechanism is to immobilize different classes of pollutants, thanks to the carbon structure and functional groups present on the surface [35,36], resulting in the contaminants being ready for biodegradation [37]. These important effects should also be linked to the electron transfer capacity of biochar, which may be responsible for the degradation of several pollutants [38][39][40][41]. These premises explain why recent studies point to biochar as a possible support for the growth of specific bacterial consortia (as a biofilm carrier [42]) and for enhancing biodegradation of pollutants [25,43,44].…”

Section: Introductionmentioning

confidence: 99%

Coupled Adsorption and Biodegradation of Trichloroethylene on Biochar from Pine Wood Wastes: A Combined Approach for a Sustainable Bioremediation Strategy

et al. 2022

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Towards chlorinated solvents, the effectiveness of the remediation strategy can be improved by combining a biological approach (e.g., anaerobic reductive dechlorination) with chemical/physical treatments (e.g., adsorption). A coupled adsorption and biodegradation (CAB) process for trichloroethylene (TCE) removal is proposed in a biofilm–biochar reactor (BBR) to assess whether biochar from pine wood (PWB) can support a dechlorinating biofilm by combining the TCE (100 µM) adsorption. The BBR operated for eight months in parallel with a biofilm reactor (BR)—no PWB (biological process alone), and with an abiotic biochar reactor (ABR)—no dechlorinating biofilm (only an adsorption mechanism). Two flow rates were investigated. Compared to the BR, which resulted in a TCE removal of 86.9 ± 11.9% and 78.73 ± 19.79%, the BBR demonstrated that PWB effectively adsorbs TCE and slows down the release of its intermediates. The elimination of TCE was quantitative, with 99.61 ± 0.79% and 99.87 ± 0.51% TCE removal. Interestingly, the biomarker of the reductive dechlorination process, Dehalococcoides mccartyi, was found in the BRR (9.2 × 105 16S rRNA gene copies/g), together with the specific genes tceA, bvcA, and vcrA (8.16 × 106, 1.28 × 105, and 8.01 × 103 gene copies/g, respectively). This study suggests the feasibility of biochar to support the reductive dechlorination of D. mccartyi, opening new frontiers for field-scale applications.

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Biochar catalyzed dechlorination – Which biochar properties matter?

Cited by 35 publications

References 78 publications

Biochar from Pine Wood, Rice Husks and Iron-Eupatorium Shrubs for Remediation Applications: Surface Characterization and Experimental Tests for Trichloroethylene Removal

Biochar from Pine Wood, Rice Husks and Iron-Eupatorium Shrubs for Remediation Applications: Surface Characterization and Experimental Tests for Trichloroethylene Removal

Abiotic reductive removal of organic contaminants catalyzed by carbon materials: A short review

Coupled Adsorption and Biodegradation of Trichloroethylene on Biochar from Pine Wood Wastes: A Combined Approach for a Sustainable Bioremediation Strategy

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