A hydrotalcite with Mg/Al molar ratio 2 was prepared by co-precipitation method and was characterized by XRD, TG/DTA, Zeta potential and BET surface area. The hydrotalcite was calcined at 500 degrees C, with the dehydration from interlayer, the dehydroxilation from the brucite-like layer and the decomposition of carbonate successively, transformed into the mixed oxide type. The removal of thiocyanate from aqueous solution by using the original hydrotalcite and calcined hydrotalcite (HTC-500) was investigated. The results showed that the thiocyanate adsorption capacity of calcined hydrotalcite was much higher than that of the original form. Calcined hydrotalcite was particularly effective at removing thiocyanate, and that the effective range of pH for the thiocyanate removal are between 5.5-10.0. The experimental data of thiocyanate removal fit nicely with Langmuir isotherm, and the saturated adsorption uptake was 96.2 mg SCN-/g HTC-500. The adsorption of thiocyanate by calcined hydrotalcite follows first-order kinetics. And the intercalation to the structure recovery for calcined hydrotalcite. But the presence of additional anions could affect the adsorption behavior of thiocyanate.
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Article Synopsis
- Layered double hydroxides (LDH), specifically hydrotalcite (HT), show promise as effective adsorbents for removing per- and polyfluoroalkyl substances (PFAS) from water, but their potential has not been thoroughly investigated.
- The study found that the adsorption efficiency of 9 different PFAS by HT is influenced by factors such as calcination temperature, aging conditions, and the presence of certain anions in solution, with optimal performance at around 400 °C.
- Interestingly, HT can be thermally regenerated without losing its ability to adsorb specific PFAS like PFOS and PFBA, indicating that it might be a viable option for PFAS treatment in water purification.
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