2018
DOI: 10.2134/jeq2017.11.0432
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Abstract: The capacity of biochars to adsorb ionic contaminants is strongly influenced by biochar surface chemistry. We studied the effects of biomass feedstock type, pyrolysis temperature, reaction media pH, and AlCl pre-pyrolysis feedstock treatments on biochar anion exchange capacity (AEC), cation exchange capacity (CEC), point of zero net charge (PZNC), and point of zero salt effect (PZSE). We used the relationship between PZNC and PZSE to probe biochar surfaces for the presence of unstable (hydrolyzable) surface ch… Show more

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Cited by 113 publications
(35 citation statements)
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“…In this work, both biochar have high pH PZC (9.2 and 7.7 for coffee parchment and spent coffee grounds biochar respectively) ( Figure 3). These data are consistent with the results reported by Banik et al, (2018), who evaluated influence pyrolysis temperature on surface charge and functional group chemistry of biochars. They showed that biochars pyrolyzed at higher temperatures (≥ 700) presented consequently higher pH PZC .…”
Section: Biochars Characterizationsupporting
confidence: 93%
“…In this work, both biochar have high pH PZC (9.2 and 7.7 for coffee parchment and spent coffee grounds biochar respectively) ( Figure 3). These data are consistent with the results reported by Banik et al, (2018), who evaluated influence pyrolysis temperature on surface charge and functional group chemistry of biochars. They showed that biochars pyrolyzed at higher temperatures (≥ 700) presented consequently higher pH PZC .…”
Section: Biochars Characterizationsupporting
confidence: 93%
“…The detectable CEC suggested that when biochar was produced at temperatures up to 480°C, some acidic oxygenated functional groups such as phenolic acid and carboxyl groups were retained (Mitchell et al 2013). Banik et al (2018) reported that the CEC of biochar is dependent on the nature and distribution of O-containing functional groups on the biochar surface. The negative charge sites on biochar surfaces are attributed to carboxylate and phenolate functional groups (Mia et al 2017).…”
Section: Surface Functional Groups and Cecmentioning
confidence: 99%
“…The negative charge sites on biochar surfaces are attributed to carboxylate and phenolate functional groups (Mia et al 2017). They assume that negative surface charge can only come from carboxylate and phenolate groups and positive charge from oxonium groups (heteroatoms in aromatic rings) (Banik et al 2018). However, other studies have found that biochars with higher specific surface area (obtained at temperatures above 600°C) have greater surface microporosity and increased CEC (Gomez-Eyles et al 2013; Kasozi et al 2010).…”
Section: Surface Functional Groups and Cecmentioning
confidence: 99%
“…The zeta potential of canola-strawand peanut-straw-derived biochars became more negative as the solution pH increased between 3.0 and 8.0, indicating a greater negative charge density on the biochar surface at a higher pH (Xu et al, 2011). Biochars derived from corn stover, red oak, cottonseed hull, pecan shell, and pure cellulose through 200-900 • C slow pyrolysis showed pH ZNC (pH at which biochar has zero net charge) in the range of 3.1-8.5, increasing as the pyrolysis temperature was raised (Uchimiya et al, 2011a;Banik et al, 2018). This corroborates that biochars produced at higher temperatures had a lower CEC value owing to further losses of surface functional groups (Figure 2), as a higher pH ZNC indicates fewer negative charges on the surface.…”
Section: Mechanismsmentioning
confidence: 99%