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- Title
镧改性生物炭在砂柱中单独运移及与Cr (Ⅵ) 共运移.
- Authors
顾鑫锋; 潘慧; 张连毅; 丁竹红
- Abstract
In order to investigate the transport of rare earth metal-modified biochar in soil-groundwater, lanthanum, a common rare earth element, was used to prepare modified biochar in this study. The lanthanum-modified biochar was then ball-milled to obtain fine biochar particles (La-BC) . The transport and retention of La-BC alone (single-transport), and together with Cr (Ⅵ) (co-transport), in a saturated quartz sand column were studied at different conditions of flow rate, pH, ionic strength, and humic acid concentration. The results showed that the mass recovery of La-BC in the effluent increased from 58.0% to 73.4% in single-transport and ranged from 78.7% to 80.1% in cotransport when flow rate was increased from 1.0 mL ·min-1 to 1.5 mL ·min-1 . The peak relative concentration (Ct /C0) values of La-BC breakthrough curves in single-transport and co-transport increased from 0.66 to 0.93 and from 0.80 to 0.85 when pH increased from 5 to 7. The peak Ct/C0 values of La-BC breakthrough curves were reduced to 0.05 in single-transport when ionic strength increased to 5 mmol·L-1, and to 0.81–0.75 in co-transport. The mass recovery in the effluent was reduced by about 13 percentage points and about 3 percentage points in single-transport and co-transport when humic acid concentration increased from 0 to 10 mg·L-1 . Compared with single-transport, the existence of Cr (Ⅵ) in co-transport inhibited transport of La-BC under neutral conditions in a saturated medium and promoted its transport under other experimental conditions. Therefore, appropriately low flow rate, low pH, a certain ionic strength, and humic acid concentration contribute to the retention and stabilization of the modified biochar.
- Subjects
BIOCHAR; RARE earth metals; SAND; HUMIC acid; PARTICULATE matter; IONIC strength; LANTHANUM
- Publication
Journal of Agro-Environment Science, 2023, Vol 42, Issue 2, p352
- ISSN
1672-2043
- Publication type
Article
- DOI
10.11654/jaes.2022-0579