This study investigated the characteristics of nanoscale bamboo charcoal (NBC), and made a comparisonwithmicroscale
bamboo charcoal (MBC) on howthey impact on the sorption abilities of different soils. The two charcoals
contained similar elemental contents (e.g., high C, low H and low N) and various functional groups on their surfaces
(e.g., aromatic structure, carboxyl, and hydroxyl). However, NBC had a larger total pore volume than that of
MBC and was more likely to generate multi-layer sorption of phenanthrene. Controlled by van derWaals forces
and electrostatic forces, NBC formed meso-and macropores (intra-particle porosity) and a more intricate pore
structure. The performance of NBC in aqueous and soil-water systemswas conspicuous and impressing. In aqueous
system, by virtue of its larger pore volume, surface area and nonprotonated aromatic carbon, the Kd (sorption
coefficient) of NBC reached up to 1.24 × 106, almost 10 times higher than that of MBC. In soil-water systems, although
it could aggregate and react with compounds in soil, the performance of NBC was not weakened by the
complicated soil properties, andwas stillmore capable of phenanthrene sorption thanMBC, even at an extremely
lowaddition rate 0.2% in soils. Additionally, in comparisonwith someother common biochars,NBC still showed a
promising capacity for phenanthrene sorption in two systems. This finding increases our knowledge of NBC for
the remediation of organic pollutants in soil and indicates that the addition rate of charcoals in soils could be reduced
by lessening the particle size. Therefore, NBC provides a new possibility for soil pollutant remediation and
deserves further research.
This study investigated the characteristics of nanoscale bamboo charcoal (NBC), and made a comparisonwithmicroscalebamboo charcoal (MBC) on howthey impact on the sorption abilities of different soils. The two charcoalscontained similar elemental contents (e.g., high C, low H and low N) and various functional groups on their surfaces(e.g., aromatic structure, carboxyl, and hydroxyl). However, NBC had a larger total pore volume than that ofMBC and was more likely to generate multi-layer sorption of phenanthrene. Controlled by van derWaals forcesand electrostatic forces, NBC formed meso-and macropores (intra-particle porosity) and a more intricate porestructure. The performance of NBC in aqueous and soil-water systemswas conspicuous and impressing. In aqueoussystem, by virtue of its larger pore volume, surface area and nonprotonated aromatic carbon, the Kd (sorptioncoefficient) of NBC reached up to 1.24 × 106, almost 10 times higher than that of MBC. In soil-water systems, althoughit could aggregate and react with compounds in soil, the performance of NBC was not weakened by thecomplicated soil properties, andwas stillmore capable of phenanthrene sorption thanMBC, even at an extremelylowaddition rate 0.2% in soils. Additionally, in comparisonwith someother common biochars,NBC still showed apromising capacity for phenanthrene sorption in two systems. This finding increases our knowledge of NBC forthe remediation of organic pollutants in soil and indicates that the addition rate of charcoals in soils could be reducedby lessening the particle size. Therefore, NBC provides a new possibility for soil pollutant remediation anddeserves further research.
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