2018
DOI: 10.1016/j.scitotenv.2017.12.337
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Continuous leaching modifies the surface properties and metal(loid) sorption of sludge-derived biochar

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Cited by 32 publications
(7 citation statements)
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“…Photochemical and chemical oxidation and microbial transformation have potential to increase the fragmentation (Tan et al, 2020), dissolution (Silber, Levkovitch, & Graber, 2010) and adsorption of biochar (Ren et al, 2018), which modify the physiochemical properties of the biochar. Alternating wetting–drying soil conditions because of variations in temperature, rainfall and irrigation also increase the fragmentation of biochar and further modify the effectiveness of the applied biochar in the field (Feng et al, 2018). The differences in the particle sizes of the applied biochar (Liu et al, 2017) and soil–root–biochar interactions between field and laboratory conditions may also modify its effectiveness by altering the biochar‐induced negative priming of organic carbon in the rhizosphere (Weng et al, 2017), which requires further investigation.…”
Section: Discussionmentioning
confidence: 99%
“…Photochemical and chemical oxidation and microbial transformation have potential to increase the fragmentation (Tan et al, 2020), dissolution (Silber, Levkovitch, & Graber, 2010) and adsorption of biochar (Ren et al, 2018), which modify the physiochemical properties of the biochar. Alternating wetting–drying soil conditions because of variations in temperature, rainfall and irrigation also increase the fragmentation of biochar and further modify the effectiveness of the applied biochar in the field (Feng et al, 2018). The differences in the particle sizes of the applied biochar (Liu et al, 2017) and soil–root–biochar interactions between field and laboratory conditions may also modify its effectiveness by altering the biochar‐induced negative priming of organic carbon in the rhizosphere (Weng et al, 2017), which requires further investigation.…”
Section: Discussionmentioning
confidence: 99%
“…For instance, atmospheric aging of sludge biochar for 2 months could only increase the amount of oxygen-containing functional groups by 2% (incubation temperature 45 °C, measured by the Boehm titration method) . Rainfall events can also result in biochar oxidation owing to the dissolved oxygen and nitrogen oxides in rainwater. Rainfall events can also lead to physical disintegration and acidification, thus causing labile carbon to be released as DOM, minerals to leach out and additional oxygen-containing functional groups, such as hydroxyl, carbonyl, and carboxyl, to be introduced to the biochar surface. It is not yet clear whether biochar is oxidized during freeze–thaw processes.…”
Section: Mechanismsmentioning
confidence: 99%
“…Nevertheless, how ageing affects biochar surface area and pore structure is not clear cut, as results vary between studies. For instance, Feng et al (2018) reported from laboratory experiments that biochar pores were damaged when constantly exposed to air or flushed by neutral and acidic solutions, and the surface area of biochar was reduced by ~40%. Yi et al (2020) noted smoothing of the internal biochar surface 2 years after burial in the field, but subsequent physical fragmentation and collapse of large pores and an increase in micropores with the prolongation of ageing time.…”
Section: Element Composition and Ash Contentmentioning
confidence: 99%