Laboratoire Génie Civil et géoEnvironnement (LGCgE), Yncréa Hauts-de-France, 48 boulevard Vauban, 59046, Lille Cedex, France.
Néo-Eco Recycling, 59320, Haubourdin, France.
Environ Sci Pollut Res Int. 2017 Aug;24(22):18204-18217. doi: 10.1007/s11356-017-9520-5. Epub 2017 Jun 20.
The objective of this study was to evaluate the sorption efficiency of eight biochars, made from Miscanthus x giganteus cultivated on contaminated agricultural soil, in aqueous solutions contaminated with metals alone or mixed with polycyclic aromatic hydrocarbons. These biochars were produced in different pyrolysis conditions (temperature, 400/600 °C; heating rate, 5/10 °C min; duration, 45/90 min) and compared with an uncontaminated commercialized biochar made of wood. The physicochemical characterization of the Miscanthus biochars confirmed the impact of the pyrolysis on the biochar parameters with substantial differences between the biochars in terms of pH, cation exchange capacity, and specific surface area. The sorption experiment showed higher sorption efficiency of Cd, Pb, and Zn for the Miscanthus biochars produced at 600 °C compared with the biochars produced at 400 °C when the aqueous solutions were mono- or multicontaminated. Furthermore, the desorption study showed that the sorption process was largely irreversible. Therefore, the high sorption capacity of Miscanthus biochars and the low sorption reversibility confirmed that these biochars are a suitable sorbent for metals.
本研究的目的是评估 8 种生物炭对单独或混合多环芳烃污染的金属水溶液的吸附效率，这些生物炭由受污染农业土壤上种植的杂交狼尾草制成。这些生物炭是在不同的热解条件下（温度 400/600°C；加热速率 5/10°C/min；持续时间 45/90min）产生的，并与一种由木材制成的未受污染的商业化生物炭进行了比较。杂交狼尾草生物炭的物理化学特性证实了热解对生物炭参数的影响，不同生物炭在 pH 值、阳离子交换容量和比表面积方面存在显著差异。吸附实验表明，当水溶液单污染或多污染时，600°C 下生产的杂交狼尾草生物炭对 Cd、Pb 和 Zn 的吸附效率高于 400°C 下生产的生物炭。此外，解吸研究表明，吸附过程在很大程度上是不可逆的。因此，杂交狼尾草生物炭的高吸附容量和低吸附可逆性证实了这些生物炭是金属的一种合适的吸附剂。
