On the destruction of kaolinite and gibbsite by phenylphosphonic, phenylphosphinic and phenylarsonic acids: evidence for the formation of new Al compounds

Abstract

Kaolinite and synthetic γ-Al(OH)3 (gibbsite or hydrargillite) were reacted with phenylphosphonic, phenylphosphinic and 2-nitrophenol-4-arsonic acids. The products were studied by powder X-ray diffraction, transmission electron microscopy/selected area electron diffraction/ energy dispersive X-ray/Fourier transform infrared and simultaneous thermogravimetric/differential thermal analysis. The acids were not intercalated but, instead, easily destroyed the structure of the minerals. Lamellar Al phenylphosphonate and aluminium phenylphosphinate and phenylarsonate with polymeric linear-chain structures were formed from kaolinite. The reaction between gibbsite and the same acids yielded almost identical products. No evidence of formation of grafted kaolinite derivatives after the reaction with phenylphosphonic acid was found.

Interlayer surface modification of the protonated ion-exchangeable layered perovskite HLaNb2O7•xH2O with organophosphonic acids

“…In the spectrum of PPA/C 10 O-HLaNb, a broad signal is observed at 13 ppm, whereas broad signals are present at 28-30 ppm in the spectra of APA/C 10 O-HLaNb. The solid-state 31 P MAS NMR spectra of PPA and APA molecules were also measured. The spectrum of PPA displayed a signal at 22 ppm.…”

“…Solid-state 13 C and 31 P nuclear magnetic resonance (NMR) spectroscopy was performed with a JEOL CMX-400 (9.4 T) spectrometer at 100.54 and 161.84 MHz, respectively. Solid-state 13 C NMR spectra were obtained with cross-polarization (CP) and magic angle spinning (MAS) techniques (pulse delay, 5s; contact time, 1.5 s; spinning rate, 8 kHz), while solid-state 31 P NMR spectra were obtained with a MAS technique only (pulse delay, 20 s; pulse angle, 90°; spinning rate, 8 kHz). Inductively coupled plasma emission spectrometry was performed with a Thermo Jarrel Ash ICAP-574 II instrument after dissolving the sample (about 1.8 mg) in a mixture of 5 mL of conc.…”

“…To date, this type of modification has been used to develop graft-type organic derivatives, such as adsorbents with selective adsorption behavior, , porous materials, and new layered silica nanosheets with hydrolyzable alkoxysilyl groups . As concerns interlayer surface modification with organophosphonic acids [RPO(OH) 2 ] or related compounds, (HO) 2 OP-R-PO(OH) 2 , intercalation of anionic guest species was first achieved via anion-exchange reactions or reactions of molten phenylphosphonic acid with layered double hydroxides (LDHs) or its calcined product, and subsequent heat-treatments of the anion-intercalated compounds led to the formation of graft-type organic derivatives. − Interlayer surface modification of 1:1 type silicate minerals, kaolinite and halloysite, with phenylphosphonic acid was also attempted, , but it was clarified that the final layered structures were obtained via dissolution and a subsequent recrystallization process because of the acidity of phenylphosphonic acid . The reactions of other silicates, phlogopite and chrysotile, with phenylphosphonic acid also involved partial dissolution of the silicate layers (leaching process). , Organic derivatization of bayerite and edge derivatization of exfoliated α-Zr(HPO 4 ) 2 ·H 2 O nanosheets were also achieved using organophosphonic acids.…”

“…[25][26][27][28] Interlayer surface modification of 1:1 type silicate minerals, kaolinite and halloysite, with phenylphosphonic acid was also attempted, 29,30 but it was clarified that the final layered structures were obtained via dissolution and a subsequent recrystallization process because of the acidity of phenylphosphonic acid. 31 The reactions of other silicates, phlogopite and chrysotile, with phenylphosphonic acid also involved partial dissolution of the silicate layers (leaching process). 32,33 Organic derivatization of bayerite 34 and edge derivatization of exfoliated R-Zr(HPO 4 ) 2 3 H 2 O nanosheets 35 were also achieved using organophosphonic acids.…”

Partial Transformation of Imogolite by Decylphosphonic Acid Yields an Interface Active Composite Material

“…[16][17][18] A possible alternative reaction path for imogolite is the formation of bulk aluminum phosphonates. It is already known for the intercalation of gibbsite and kaolinite with phenylphosphonic acid (PPA) 23 , the modification of aluminum oxide by ODPA 24 and PPA 4 , and the modification of germanium imogolite by ODPA. 19 Nonetheless, it was shown that choosing favorable conditions prevents the bulk phosphonate formation and enables grafting of alumina by octylphosphonic acid.…”