SI Table 3. Efficiency Offluoride Removal from Fifteen Geothermal Water Samples Collected

SI Table 3. Efficiency offluoride removal from fifteen geothermal water samples collected from the Yangbajing geothermal field (YBJ), the Yangyi geothermal field (YY), the Rehai geothermal field (RH), and theLongling geothermal field (LL) by calcined hydrotalcite at 65 °C.25 mL of geothermal water was used in all experiments.

Geothermal water sample number / After reaction with 0.056 g of calcined hydrotalcite / After reaction with 0.56 g of calcined hydrotalcite / After reaction with 2.80 g of calcined hydrotalcite
Initial sample fluoride concentration (mg/L) / Sample fluoride concentration (mg/L) / Fluoride removal percent (%) / Sample fluoride concentration (mg/L) / Fluoride removal percent (%) / Sample fluoride concentration (mg/L) / Fluoride removal percent (%)
YBJ / 28.5 / 19.8 / 30.6% / 5.6 / 80.4% / 2.2 / 92.4%
YY / 13.0 / 9.1 / 29.8% / 7.1 / 45.5% / 1.6 / 87.4%
RH01 / 18.2 / 11.8 / 35.4% / 7.3 / 59.9% / 2.2 / 87.8%
RH02 / 13.8 / 1.7 / 87.6% / 0.6 / 95.6% / 0.4 / 96.8%
RH03 / 8.1 / 0.8 / 90.5% / 0.5 / 94.3% / 0.3 / 96.3%
RH04 / 16.1 / 7.1 / 55.9% / 0.8 / 95.2% / 0.5 / 96.6%
RH05 / 9.0 / 1.5 / 83.1% / 0.5 / 94.7% / 0.4 / 95.4%
RH06 / 11.7 / 2.2 / 81.5% / 0.7 / 93.9% / 0.5 / 95.4%
RH07 / 3.8 / 1.1 / 69.5% / 0.6 / 85.0% / 0.5 / 87.2%
LL01 / 20.7 / 5.8 / 72.0% / 0.5 / 97.7% / 0.3 / 98.3%
LL02 / 21.3 / 7.7 / 64.0% / 0.4 / 97.9% / 0.4 / 98.3%
LL03 / 19.4 / 3.9 / 79.8% / 0.5 / 97.4% / 0.5 / 97.6%
LL04 / 19.8 / 5.6 / 71.8% / 0.4 / 97.8% / 0.6 / 97.2%
LL05 / 19.3 / 6.5 / 66.1% / 0.5 / 97.5% / 0.5 / 97.5%
LL06 / 23.3 / 3.8 / 83.8% / 0.5 / 97.9% / 0.4 / 98.1%