Fluoride contamination of groundwater has become one of the most serious problems in the world. Currently, excessive absorption of fluoride can be toxic to humans and crops. To address the challenge, we explored the excellent properties of functionalized pillar[5]arene polymer framework. By constructing a multistage porous nanochannel membrane, the pillar[5]arene polymer-filled nanochannel membrane achieves a fluoride removal.

Abstract

Excess fluoride ions in groundwater accumulate through the roots of crops, affecting photosynthesis and inhibiting their growth. Long-term bioaccumulation also threatens human health because it is poorly degradable and toxic. Currently, one of the biggest challenges is developing a unique material that can efficiently remove fluoride ions from the environment. The excellent properties of functionalized pillar[5]arene polymer-filled nanochannel membranes were explored to address this challenge. Constructing a multistage porous nanochannel membrane, consisting of microscale etched nanochannels and nanoscale pillar[5]arene cross-linked polymer voids. A fluoride removal rate of 0.0088 mmol ⋅ L⁻¹ ⋅ min⁻¹ was achieved. Notably, this rate surpassed the rates observed with other control ions by a factor of 6 to 8.8. Our research provides a new direction for developing water fluoride ion removal materials.