Quaternary Amine Clay Adsorbents for Low-Cost PFAS Removal

The patent uses composite materials by combining attapulgite or sepiolite clay minerals with quaternary amine functional groups. This composite structure maintains the simplicity of adsorption while significantly improving PFAS removal efficiency through the specific chemical affinity between quaternary amines and PFAS molecules.

The patent changes the chemical parameters of the adsorbent by introducing quaternary amine functional groups onto the clay mineral surface. This parameter change transforms the adsorbent from non-specific physical adsorption to specific chemical adsorption, thereby improving removal efficiency while maintaining process simplicity.

The patent employs cheap clay mineral-based adsorbents functionalized with quaternary amines as disposable removal media. These low-cost adsorbents achieve high removal efficiency through single-use batch or continuous flow processes, eliminating the need for expensive membranes or resins while maintaining effective PFAS removal.

The patent replaces mechanical high-pressure membrane systems with chemical adsorption using quaternary amine-functionalized clays. This substitution eliminates expensive pressure equipment while achieving comparable or superior removal efficiency through specific chemical interactions between the amine groups and PFAS molecules.

The patent improves upon previous clay modifications by changing the amine structure from oleyl/octyl amines to quaternary amines. This parameter change in the chemical structure provides permanent positive charges that enhance PFAS removal efficiency while maintaining the cost-effectiveness of clay-based materials.

The patent creates an optimized composite material by combining quaternary amine functional groups with attapulgite or sepiolite clay minerals. This composite achieves superior removal efficiency compared to oleyl/octyl amine modifications while remaining cost-effective due to the abundant availability of the clay minerals.