Metal sorption by biochars: A trade-off between phosphate and carbonate concentration as governed by pyrolysis conditions

Poucke, Reinhart Van; Allaert, Simon; Ok, Yong Sik; Pala, Mehmet; Ronsse, Frederik; Meers, Erik

doi:10.1016/j.jenvman.2019.05.112

Cited by 17 publications

(5 citation statements)

References 34 publications

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“…DTPA, as a recommended agent for extracting available heavy metals from geo-samples, can remove effectively organic ligand-complexed heavy metals, , which excluded the possibility of the decreased available Cu caused by organic complexation in the biochars. It was therefore presumed that the emergence of high levels of Ca-containing phosphates and carbonates provided sorption sites for cations , including Cu 2+ and thus significantly decreased available Cu in the biochars. − This hypothesis was well confirmed with our previous observation that the swine manure-derived biochars showed significant decreases in their sorption capability (equal to about 10% of the raw biochar) for Cu after removing inorganic components by washing the biochars with 1.0 mol/L HCl.…”

Section: Resultssupporting

confidence: 60%

Copper Speciation Evolution in Swine Manure Induced by Pyrolysis

Yuan

Luo

et al. 2020

Environ. Sci. Technol.

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Swine manures generally contain high levels of copper (Cu) resulting from its use as a growth promoter in feedstuff. Pyrolysis can further concentrate Cu whereas decrease its available fraction in swine manures. Here we investigated the speciation transformation of Cu and associated elements in swine manures induced by pyrolysis using multiple X-ray absorption spectroscopies. Results showed that over 82% of Cu existed as Cu(I)−S and Cu(I)−thiolate complexes in swine manures, which were transformed into stable Cu(I) 2 S during pyrolysis at a low temperature of 300 °C and partially oxidized and desulfurized into Cu(II) compounds at a high temperature of 500 °C. The speciation evolution of Cu in swine manures was consistent with the speciation distribution of sulfur in feedstuff and its following changes in swine manures during pyrolysis. About 58% of phosphorus existed as CaHPO 4 and struvite in swine manures, which were gradually transformed into stable Ca-bound species such as hydroxyapatite during pyrolysis. The formation of stable phosphate, together with concentrated carbonates, significantly decreased the available Cu in pyrolyzed manures. These findings suggested that the high levels of S and P in feedstuff profoundly affected the speciation of Cu in the swine manures and derived biochars. This study has important implications to our understanding of the behaviors of heavy metals in manure-derived biochars once entering soil environments.

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Section: Resultssupporting

confidence: 60%

Copper Speciation Evolution in Swine Manure Induced by Pyrolysis

Yuan

Luo

et al. 2020

Environ. Sci. Technol.

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“…Biochar application in Ecuadorian soil (typical pH 6 41 ), can thus decrease the Cd concentration in cocoa pod beans. Moreover, biochar has been demonstrated to effectively adsorb both Cd and Pb 50 .…”

Section: Slow Pyrolysis Of Cocoa Pod Husksmentioning

confidence: 99%

Integrating anaerobic digestion and slow pyrolysis improves the product portfolio of a cocoa waste biorefinery

Ghysels

Acosta

Estrada

et al. 2020

Sustainable Energy Fuels

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“…The range of the concentrations of metals in the solution which was tested in the second phase of batch sorption tests was limited to 3 values due to the lack of significant differences in mono-metal sorption at the lowest and highest concentrations. In the present study, the ratio of biochar to liquid in Phase I was 1:10 (10 g of biochar to 100 mL of the solution) in the range reported in the literature, e.g., by Van Poucke et al [ 30 ]. In Phase II, we used also a smaller dose of biochar (5 g of biochar in 100 mL of the solution) in a ratio of 1:20.…”

Section: Methodsmentioning

confidence: 69%

“…The presence of carbonates and phosphates in the composition of biochars facilitates the precipitation of metals from the solutions through the formation of insoluble complexes, thus increasing sorption capability. The concentrations of these anions depended on pyrolysis temperature and time [ 30 ]. A similar phenomenon was observed by Cao and Harris [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Pyrolysis Temperature on the Heavy Metal Sorption Capacity of Biochar from Poultry Manure

et al. 2021

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Sorption properties of various biochars have been extensively investigated by many researchers. One of the parameters that have a significant impact on sorption properties is pyrolysis temperature. This paper presents a study on the effect of pyrolysis temperature (425, 575, 725 °C) on the sorption properties of poultry-manure-derived biochar (BPM). The produced biochars, i.e., BPM425, BPM575 and BPM725, demonstrated specific properties at 425, 525 and 752 °C such as high pH (10.40, 10.65 and 12.45), high ash contents (52.07, 61.74 and 78.38%) and relatively low BET (Brunauer, Emmett and Teller) surface area (11, 17 and 19 m2·g−1). The analysis of the mineral phases of the BPMs confirmed the buffering capacity. The investigated biochars were tested for sorption of Zn, Cd and Pb in mono-, double- and triple-metal batch sorption tests. According to the obtained results, biochar produced at a temperature of 575 °C (BPM575) can function as a sufficient sorbent for the removal of Zn, Cd and Pb from a water solution. The presented results do not confirm the effect of competing metal ions on the sorption efficiency of the selected metals by the investigated biochars. Based on that, the studied biochar sorbents can be used in environments contaminated with many metals.

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Metal sorption by biochars: A trade-off between phosphate and carbonate concentration as governed by pyrolysis conditions

Cited by 17 publications

References 34 publications

Copper Speciation Evolution in Swine Manure Induced by Pyrolysis

Copper Speciation Evolution in Swine Manure Induced by Pyrolysis

Integrating anaerobic digestion and slow pyrolysis improves the product portfolio of a cocoa waste biorefinery

Influence of Pyrolysis Temperature on the Heavy Metal Sorption Capacity of Biochar from Poultry Manure

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