Transport and interactions of kaolinite and mercury in saturated sand media

Journal of Hazardous Materials
Yingjia ZhuBinhe Gu

Abstract

To evaluate the potential of Hg release and co-transport by colloids, it is important to understand how Hg, colloids and Hg-loaded colloids migrate in soils. Hg sorption by kaolinite and sand were nonlinear and fit the Langmuir model, with the maximum Hg sorption capacity being 1.2mg/g kaolinite and 0.11 mg/g sand. Co-transport of Hg and kaolinite was evaluated using: (1) 1 or 100 mg/L Hg or 100mg/L kaolinite, (2) 1 or 100 mg/L Hg mixed with 100mg/L kaolinite, (3) 1 or 100 mg/L Hg presorbed onto kaolinite, and (4) 25 0mg/L kaolinite in Hg-loaded sand columns. The presence of kaolinite (100 mg/L) reduced Hg's mobility through sand column by increasing deposition rate of Hg-loaded kaolinite. At 100 mg/L Hg, soluble Hg dominated Hg transport; but at 1 mg/L Hg, colloidal Hg (Hg sorbed on kaolinite) affected Hg transport. Preloading 100 mg/L Hg onto kaolinite (0.43 mg/g) reduced kaolinite's mobility with low recovery rate (78%), with Hg retardation (R=1) in Hg-loaded kaolinite being lower than Hg retardation at 100 mg/L Hg (R=1.287). The Hg recovery rate (93%) from Hg-loaded kaolinite at 1mg/L Hg was higher compared to 22% from 1 mg/L Hg. Kaolinite can serve as a carrier to enhance Hg transport in porous media, with 250 mg/L kaolini...Continue Reading

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Citations

Jun 15, 2014·Environmental Science and Pollution Research International·Bertrand LetermeDiederik Jacques
Jun 24, 2015·Environmental Science and Pollution Research International·Bertrand Leterme, Diederik Jacques
Mar 8, 2016·Environmental Science & Technology·Ke GaiGregory V Lowry
Jun 26, 2020·Environmental Science and Pollution Research International·Meng MaoJianying Shang

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