Details

Autor(en) / Beteiligte

• Diao, Yusen
• Zhou, Xiangqian
• Zhu, Yun
• Yan, Jinlong
• Quan, Guixiang
• Pan, Mei
• Wu, Panfeng
• Chen, Hao
• Huang, Jiafeng
• Wang, Heng

Titel

Formation of Nanoscale Biochar-EPS Corona: Adsorption and Toxicity

Ist Teil von

• Water, air, and soil pollution, 2024-06, Vol.235 (6), p.379, Article 379

Ort / Verlag

Cham: Springer International Publishing

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Biochar (BC) can be coated with microbial extracellular polymeric materials (EPS) to form BC-EPS corona in an aqueous environment, which may significantly alter its ecological toxicity caused by EPS-facilitated accumulation of environmental contaminants. This work examined the EPS corona formation on the surface of shrub branch BC and wheat straw BC, pyrolyzed at 450 °C and 650 °C, and evaluated its effect on the sorption of divalent metals Cd 2+ , Pb 2+ , Cu 2+ , and Ni 2+ . In single metal systems, the formation of a BC-EPS corona shows little enhancement on Cd 2+ and Cu 2+ accumulation, but significantly elevated Ni 2+ and Pb 2+ adsorption: Ni 2+ sorption increased from 20 mg/g for pristine BCs to 30 mg/g, Pb 2+ sorption increased from below 25 mg/g to above 90 mg/g. In multiple metal systems, the binding distribution of Pb 2+ and Cu 2+ on BC-EPS corona appeared to be more extensive compared to that of Cd 2+ and Ni 2+ . The toxicity of BC-EPS increased by about 2 to 3 times in aquatic organisms compared to pristine BC, attributed to the higher accumulation of heavy metals in BC-EPS corona. In summary, BC-EPS corona enhanced BC’s sorption capacity for metals, especially for Pb 2+ and Ni 2+ , thus elevating the BC’s ecological risks owing extra amount of pollution loading. Graphical Abstract