Presently, people are suffering from more and more serious fluoride …

Presently, people are suffering from more and more serious fluoride pollution because large numbers of fluorine compounds have been consumed and produced, particularly in high-tech industries such as semiconductors and integrated circuits production. Consequently, treatment of fluoride ion from aqueous solution has become a worldwide important subject..................

If you have the technical knowledge to understand the above it may be worth reading (I don't)