Journal
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
Volume 106, Issue 1, Pages 134-145Publisher
SPRINGER
DOI: 10.1007/s00128-020-03053-y
Keywords
Adsorption; Cr(VI); Low concentration; Mg– Al LDOs
Categories
Funding
- National Natural Science Foundation of China [41502240, 41601338]
- Natural Science Basic Research Plan in Shaanxi Province of China [2020JM-110, 2018JQ4019]
- Fundamental Research Funds for the Central Universities [3102018zy042]
- National Training Program of Innovation and Entrepreneurship for Undergraduates [S201910699176, S202010699478]
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Mg-Al layered double oxides (LDOs) show high efficiency in adsorption removal of low-concentration Cr(VI), with adsorption effectiveness influenced by pH and anion competition. Experimental data fits well with pseudo-second-order and Freundlich models.
To explore the adsorption removal mechanism of Mg-Al layered double oxides (LDOs) for low-concentration (<= 5 mg L-1) Cr(VI), the adsorption kinetics, adsorption isotherms and its influencing factors were studied by batch experiments. Cr(VI) adsorption reached equilibrium after 6, 11 and 15 h for initial Cr(VI) concentrations of 1, 3 and 5 mg L-1, respectively, and the final adsorption efficiency exceeded 99.0%. The residual concentration of Cr(VI) was within the allowable limit of Drinking Water Quality Standard of World Health Organization (0.05 mg L-1). The experimental data fitted the pseudo-second-order and Freundlich models well. Mg-Al LDOs showed effective adsorption efficiency in the range of pH 3-9, and the adsorption efficiency was influenced by anions competition (HPO42- > SO42- > CO32- > NO3- > Cl-). The analyses of XRD, SEM and FT-IR spectra suggested adsorption Cr(VI) on Mg-Al LDOs was caused by capturing dichromate ions to reconstruct its structure. Therefore, Mg-Al LDOs is promising adsorbents for the low-concentration Cr(VI) treatment in polluted surface water and groundwater.
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