Crystalline aluminoborates, their method of preparation and use

A process for removing per- and polyfluoroalkyl substances from water comprising contacting said water with a composition comprising an empirical formula:

• where M is a trivalent framework element, B is boron, O is oxygen, N is nitrogen and H is hydrogen and wherein x is 3-8, y is 1-5, z is 16-25, a is 1 and b is 10-15, wherein said composition is characterized by an x-ray diffraction having at least the d-spacings and relative spacings set forth in Table 1:
• TABLE 1
• Position 2θ (°)
• d-spacing (Å)
• Intensity
• Comment
• 6.67-6.85
• 13.23-12.89
• w
• b-s, sh
• 7.25-7.47
• 12.18-11.82
• m
• b
• 8.60-8.92
• 10.27-9.91
• vs
• b
• 14.23-14.46
• 6.22-6.12
• w
• b
• 16.62-16.81
• 5.33-5.27
• vw
• s
• 17.32-17.65
• 5.11-5.02
• vw
• b
• 18.24-18.46
• 4.86-4.80
• vw
• b
• 18.66-18.86
• 4.75-4.70
• vw
• b
• 19.59-19.80
• 4.53-4.48
• vw-w
• s
• 20.12-20.33
• 4.41-4.36
• vw-w
• s
• 20.70-20.89
• 4.29-4.25
• vw-w
• s
• 21.19-21.40
• 4.19-4.15
• vw-w
• b
• 21.88-22.05
• 4.06-4.03
• vw-w
• b
• 22.18-22.34
• 4.00-3.98
• vw-w
• b
• 22.41-22.58
• 3.96-3.93
• vw-w
• b
• 22.82-23.14
• 3.89-3.84
• vw-w
• b, sh
• 23.95-24.16
• 3.71-3.68
• vw-w
• b
• 25.16-25.37
• 3.54-3.51
• vw
• b
• 26.10-26.45
• 3.41-3.37
• vw
• b
• 26.94-27.12
• 3.31-3.28
• vw-w
• s
• 28.02-28.29
• 3.18-3.15
• vw
• b
• 29.00-29.23
• 3.08-3.05
• vw
• b
• 29.52-29.86
• 3.02-2.99
• vw
• b
• 30.40-30.62
• 2.94-2.92
• vw
• s
• 31.68-31.90
• 2.82-2.80
• vw
• b
• 32.54-32.78
• 2.75-2.73
• vw
• b
• 33.43-33.63
• 2.68-2.66
• vw
• b
• 34.56-34.80
• 2.59-2.58
• vw
• b
• 35.22-35.45
• 2.54-2.53
• vw
• b
• 36.51-36.77
• 2.46-2.44
• vw
• b
• 37.78-38.13
• 2.38-2.36
• vw
• b
• 38.58-38.82
• 2.33-2.32
• vw
• b
• 39.52-39.89
• 2.28-2.26
• vw
• b
• 40.65-40.85
• 2.22-2.21
• vw
• b
• 42.04-42.36
• 2.15-2.13
• vw
• b
• 42.55-43.13
• 2.12-2.10
• vw
• b
• 45.68-45.94
• 1.98-1.97
• vw
• b
• 49.24-49.60
• 1.85-1.84
• vw-w
• b
• 50.97-51.19
• 1.79-1.78
• vw
• b