Co-transport of Cr(VI) and Bentonite Colloid in Saturated Porous Media

Gu, Xinfeng; Mo, Huijing; Wang, Lei; Zhang, Lianyi; Ding, Zhuhong

doi:10.1007/s00128-022-03675-4

Cited by 4 publications

(2 citation statements)

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“…Experimental conditions were set as flow rate (1.0, 1.5, 2.5 ml•min -1 ), pH (3.0 and 7.0), IS (0 and 5.0 mmol L -1 CaCl 2 ), HA (0 and 5.0 mmol•L -1 ), and Bc concentration (50, 100, 200 mg L -1 ). Bc was positively charged at pH3 and negatively charged at other pH conditions, as reported in our previous work [13]. Other colloid was used with a concentration of 100 mg L -1 .…”

Section: Column Experimentsmentioning

confidence: 96%

“…For example, it was found that kaolinite colloids promoted Cd(II) transport under low IS conditions compared to single transport, but inhibit Cd(II) transport at high IS [11], which might result from the presence of mineral colloids. Limited reports on Cr(VI) anion also showed the inhibited or facilitated transport of Cr(VI) at different concentrations of bentonite colloidal particles [12,13].…”

Section: Author Copy • Author Copy • Author Copy • Author Copy • Auth...mentioning

confidence: 99%

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Effect of Bentonite Colloid on Cr(VI) Transport in Heterogeneous Porous Media

Gu,

Ding,

Shi

et al. 2024

Pol. J. Environ. Stud.

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Co-transport of Cr(VI) with bentonite colloids (Bc) at different flow rate, pH, ion strength (IS), and colloid concentration in heterogeneous sand media was investigated. The results showed that obvious penetration of dissolved Cr(VI) in co-transport occurred at about 0.5PV, which was mainly due to the heterogeneity of the sand column. The maximum dimensionless transport fraction ((Ct/C0) max ) of dissolved Cr(VI) was 0.73 in the co-transport (200 mg•L -1 Bc and 2.5 ml min -1 ), much lower than that in the single transport of Cr(VI) (0.98). The increase of pH promoted the transport of Cr(VI) in co-transport with Bc. Elevated flow rate, ion strength, and Bc concentration reduced Cr(VI) transport. Cr(VI) in the effluent in co-transport with Bc was dominated by dissolved Cr(VI), and a small amount of colloidal Cr(VI) (～4.97%) was observed. The recovery rates of total transported Cr(VI) (dissolved +colloidal) in co-transport with Bc were obviously lower than those in single transport. (Ct/C0) max values of dissolved Cr(VI) in the co-transport with Bc were also lower than those with other colloids, e.g. kaolin colloid, montmorillonite colloid, and inorganic soil colloid. Application of bentonite may alleviate the transport risk of Cr(VI) to groundwater.

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Section: Column Experimentsmentioning

confidence: 96%