Impact of chemical aging on pyrogenic carbon colloid facilitated transport and transformation of Cr (VI) in anoxic environments

Zhao，Kang1,2; Wang，Shuai1; Shang，Jianying2; Liu，Chongxuan1

2024-12-05

10.1016/j.jhazmat.2024.135984

Journal of Hazardous Materials   影响因子和分区

0304-3894

1873-3336

Frequent wildfires have accumulated the pyrogenic carbon (PyC) colloids in the environment, where they undergo environmental aging processes. The altered properties of aged PyC colloids may affect their ability to facilitate transformation and transport of contaminants in post-fire environments, posing unknown threats to ecological security. This study investigated the effect of chemical aging on the PyC colloid-facilitated transformation and transport of chromium (Cr) using batch experiments, column experiments, and transport model simulations. Results showed that aged PyC colloids exhibited weaker electron-donating capacity, and the reduction of Cr (VI) to Cr (III) decreased from 37.6 % to 13.5 % with the increasing aging time. Although PyC colloid transport increased with aging time, the PyC colloid-facilitated Cr (III) transport decreased because of the weakened reduction of Cr (VI). The transport of PyC colloid-facilitated Cr (III) was weaker at low pH. The reactive solute transport model well simulated the aged PyC colloid-facilitated transformation and transport of Cr (VI). Our findings highlight the significance of aging processes and environmentally relevant conditions in influencing the PyC colloid-facilitated transformation and transport of Cr, which is crucial for assessing risks of wildfire-driven Cr pollution and the potential of PyC for in-situ pollution control.

Chemical aging Cr (VI) Modeling Pyrogenic carbon colloids Transport

英语

第一

2-s2.0-85205297614

Scopus

1.State Environmental Protection Key Laboratory of Integrated Surface Water Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.College of Land Science and Technology,China Agricultural University,Key Laboratory of Arable Land Conservation,Ministry of Agriculture and Rural Affairs,Beijing,100193,China

Zhao，Kang,Wang，Shuai,Shang，Jianying,et al. Impact of chemical aging on pyrogenic carbon colloid facilitated transport and transformation of Cr (VI) in anoxic environments[J]. Journal of Hazardous Materials,2024,480.

Zhao，Kang,Wang，Shuai,Shang，Jianying,&Liu，Chongxuan.(2024).Impact of chemical aging on pyrogenic carbon colloid facilitated transport and transformation of Cr (VI) in anoxic environments.Journal of Hazardous Materials,480.

Zhao，Kang,et al."Impact of chemical aging on pyrogenic carbon colloid facilitated transport and transformation of Cr (VI) in anoxic environments".Journal of Hazardous Materials 480(2024).