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- W2987473653 abstract "In this study, F- removal by Ca-Al-CO3 layered double hydroxides (LDHs) was investigated at environmentally-relevant concentration ranges (2-12 mg/L) to below the WHO guideline, with an emphasis on the effect of LDHs' modification, as well as the effects of initial F- concentration, adsorbent dose, pH, temperature and co-existing ions. Ca-Al-CO3 LDHs, either untreated, calcined or microwave treated, showed affinity for the removal of F- from synthetic groundwater with capacities of 6.7-8.4 mg F-/g LDHs at groundwater-relevant pH, with a higher F- removal capacity at lower pH (<8) and lower temperature (12 °C, as compared to 25 °C & 35 °C). Since calcination and microwave treatment resulted in only marginal defluorination improvements, using untreated LDHs appears the practically most feasible option. For the untreated LDHs, competition with Cl- and NO3- was not observed, whereas at higher HCO3- and SO42- concentrations (>250 mg/L) a slight reduction in F- removal was observed. This study indicates the potential of Ca-Al-CO3 LDHs as a cost-effective F- removal technology, particularly when locally sourced and in combination with low-cost pH correction." @default.
- W2987473653 created "2019-11-22" @default.
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- W2987473653 date "2020-03-01" @default.
- W2987473653 modified "2023-10-01" @default.
- W2987473653 title "Fluoride removal by Ca-Al-CO3 layered double hydroxides at environmentally-relevant concentrations" @default.
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- W2987473653 doi "https://doi.org/10.1016/j.chemosphere.2019.125307" @default.
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