Functionalized nanohybrid materials obtained from the interlayer grafting of aminoalcohols on kaolinite

Abstract

New robust functionalized nanohybrid materials were prepared by the interlayer covalent attachment of aminoalcohols to the octahedral sheets of kaolinite.

New synthesis strategies for effective functionalization of kaolinite and saponite with silylating agents

“…This hypothesis agrees with the fact that the mass loss between 400 and 650°C is 13%, similar to that expected for the dehydroxylation of the clay. It is remarkable that this effect is located in this sample at a temperature notably lower than in the natural kaolinite, 480 vs. 516°C, suggesting that the presence of silicium from the silane influences the phase change from kaolinite to metakaolinite [54][55][56]. It is also remarkable that no TG or DTA effects are observed close to 185°C, confirming that all DMSO molecules have been exchanged by MPTMS.…”

Square Wave Voltammetric Determination of Lead(II) Ions Using a Carbon Paste Electrode Modified by a Thiol‐Functionalized Kaolinite

“…At this stage, DMSO was almost completely removed from the interlayer space, with a concerted replacement by silane molecules. The treatment of the obtained material (namely K-SiPCl) by water did not change the position of the 001 reflection, an indication that the organosilane moieties are covalently linked to the OH groups of the interlayer space of kaolinite [18]. Upon substitution of chloro groups by thiol ones using NaSH, the final material displayed a basal spacing of 1.00 nm, a value slightly different from that related to KSiPCl clay (0.90 nm).…”

“…The most recent examples include the grafting of aminoalcohol [18,19], oxirane [20], imidazolium cations [21] and quaternary ammonium groups [22]. Till now, most of these investigations were focused on the development of the interlayer covalent grafting of kaolinite, while the practical exploitation of the materials thereby obtained remained limited.…”

Hybrid materials prepared by interlayer functionalization of kaolinite with pyridine-carboxylic acids

“…8). In both hybrid materials, the dehydroxylation of kaolinite is observed at 470°C, a temperature slightly lower than characteristic of pure kaolinite, 516°C [38]. The samples functionalized with the pyridine-carboxylic acids show the complete substitution of DMSO molecules by pa and dpa acids, respectively.…”