A Study on the Removal Performance of Manganese Dioxide in Fluoride Removal From Drinking Water
Four different crystal forms of MnO2 adsorbents were synthesized by the hydrothermal method,and their fluoride removal abilities were studied and compared.The effects of processing time,adsorbent dosage,initial fluoride concentration,initial solution pH,and coexisting ions on the adsorption performance were evaluated.Among the four adsorbents,δ-MnO2 exhibited the highest fluoride removal efficiency.Adsorption equilibrium was achieved within 10 hours at an adsorbent dosage of 6 g/L,an initial fluoride ion concentration of 10 mg/L,and a pH of 5,with a removal rate of 95.9%.Furthermore,adsorption experiments performed using drinking water samples under natural conditions resulted in a fluoride content decrease from 5 mg/L to 0.715 mg/L,which is below the World Health Organization's maximum allowable limit.
NETL
NSTL
万方数据
